@@ -1,210 +1,82 @@
1−{-# LANGUAGE BangPatterns #-}
2−{-# LANGUAGE CPP #-}
3−{-# LANGUAGE ConstraintKinds #-}
4−{-# LANGUAGE EmptyDataDecls #-}
5−{-# LANGUAGE ExistentialQuantification #-}
6−{-# LANGUAGE FlexibleContexts #-}
7−{-# LANGUAGE FlexibleInstances #-}
8−{-# LANGUAGE FunctionalDependencies #-}
9−{-# LANGUAGE GADTs #-}
10−{-# LANGUAGE GeneralizedNewtypeDeriving #-}
11−{-# LANGUAGE LambdaCase #-}
12−{-# LANGUAGE RankNTypes #-}
13−{-# LANGUAGE RoleAnnotations #-}
14−{-# LANGUAGE ScopedTypeVariables #-}
15−{-# LANGUAGE TypeFamilies #-}
16−{-# LANGUAGE TypeOperators #-}
17−{-# LANGUAGE UndecidableInstances #-}
18−{-# LANGUAGE PolyKinds #-}
19−{-# LANGUAGE DeriveFunctor #-}
20−{-# LANGUAGE StandaloneDeriving #-}
21−{-# LANGUAGE InstanceSigs #-}
22−{-# LANGUAGE MultiWayIf #-}
23−
24−#ifdef USE_REFLEX_OPTIMIZER
25−{-# OPTIONS_GHC -fplugin=Reflex.Optimizer #-}
26−#endif
27−{-# OPTIONS_GHC -Wunused-binds #-}
28−-- | This module is the implementation of the 'Spider' 'Reflex' engine. It uses
29−-- a graph traversal algorithm to propagate 'Event's and 'Behavior's.
30−module Reflex.Spider.Internal (module Reflex.Spider.Internal) where
1+{-# LANGUAGE CPP, ExistentialQuantification, GADTs, ScopedTypeVariables, TypeFamilies, FlexibleInstances, MultiParamTypeClasses, GeneralizedNewtypeDeriving, RankNTypes, BangPatterns, UndecidableInstances, EmptyDataDecls, RecursiveDo, RoleAnnotations, LambdaCase, TypeOperators #-}
2+module Reflex.Spider.Internal where
3+
4+import qualified Reflex.Class as R
5+import qualified Reflex.Host.Class as R
316
32−#if MIN_VERSION_base(4,10,0)
33−import Control.Applicative (liftA2)
34−#endif
35−import Control.Concurrent
36−import Control.Exception
37−import Control.Monad hiding (forM, forM_, mapM, mapM_)
38−import Control.Monad.Exception
39−import Control.Monad.Identity hiding (forM, forM_, mapM, mapM_)
40−import Control.Monad.Primitive
41−import Control.Monad.Reader.Class
42−import Control.Monad.IO.Class
43−import Control.Monad.ReaderIO
44−import Control.Monad.Ref
45−import Control.Monad.Fail (MonadFail)
46−import qualified Control.Monad.Fail as MonadFail
47−import Data.Align
48−import Data.Coerce
49−import Data.Dependent.Map (DMap)
50−import qualified Data.Dependent.Map as DMap
51−import Data.Dependent.Sum (DSum (..))
52−import Data.FastMutableIntMap (FastMutableIntMap, PatchIntMap (..))
53−import qualified Data.FastMutableIntMap as FastMutableIntMap
54−import Data.Foldable hiding (concat, elem, sequence_)
55−import Data.Functor.Constant
56−import Data.Functor.Misc
57−import Data.Functor.Product
58−import Data.GADT.Compare
59−import Data.IntMap.Strict (IntMap)
60−import qualified Data.IntMap.Strict as IntMap
617import Data.IORef
62−import Data.Kind (Type)
63−import Data.Maybe hiding (mapMaybe)
64−import Data.Monoid (mempty, (<>))
65−import Data.Proxy
66−import Data.These
8+import System.Mem.Weak
9+import Data.Foldable
6710import Data.Traversable
68−import Data.Type.Equality ((:~:)(Refl))
69−import Data.Witherable (Filterable, mapMaybe)
70−import GHC.Exts hiding (toList)
71−import GHC.IORef (IORef (..))
72−import GHC.Stack
73−import Reflex.FastWeak
11+import Control.Monad hiding (mapM, mapM_, forM_, forM, sequence)
12+import Control.Monad.Identity hiding (mapM, mapM_, forM_, forM, sequence)
13+import Control.Monad.Reader hiding (mapM, mapM_, forM_, forM, sequence)
14+import GHC.Exts
15+import Control.Applicative -- Unconditionally import, because otherwise it breaks on GHC 7.10.1RC2
16+import Data.Dependent.Map (DMap, DSum (..))
17+import qualified Data.Dependent.Map as DMap
18+import Data.GADT.Compare
19+import Data.Maybe
20+import Data.IntMap (IntMap)
21+import qualified Data.IntMap as IntMap
22+import Control.Monad.Ref
23+import Control.Monad.Exception
24+import Data.Monoid ((<>))
25+
7426import System.IO.Unsafe
75−import System.Mem.Weak
7627import Unsafe.Coerce
28+import Control.Monad.Primitive
7729
78−#ifdef MIN_VERSION_semialign
79−#if MIN_VERSION_these(0,8,0)
80−import Data.These.Combinators (justThese)
81−#endif
82−#if MIN_VERSION_semialign(1,1,0)
83−import Data.Zip (Zip (..))
84−#endif
85−#endif
86−
87−#ifdef DEBUG_CYCLES
88−import Control.Monad.State hiding (forM, forM_, mapM, mapM_, sequence)
89−#endif
90−
91−import Data.List.NonEmpty (NonEmpty (..), nonEmpty)
92−import qualified Data.List.NonEmpty as NonEmpty
93−import Data.Tree (Forest, Tree (..), drawForest)
94−import Data.List (isPrefixOf)
95−
96−import Data.FastWeakBag (FastWeakBag, FastWeakBagTicket)
97−import qualified Data.FastWeakBag as FastWeakBag
98−
99−import Data.Reflection
100−import Data.Some (Some(Some))
101−import Data.Type.Coercion
102−import Data.Profunctor.Unsafe ((#.), (.#))
103−import Data.WeakBag (WeakBag, WeakBagTicket, _weakBag_children)
104−import qualified Data.WeakBag as WeakBag
105−import qualified Reflex.Class
106−import qualified Reflex.Class as R
107−import qualified Reflex.Host.Class
108−import Reflex.NotReady.Class
109−import Data.Patch
110−import qualified Data.Patch.DMapWithMove as PatchDMapWithMove
111−import Reflex.PerformEvent.Base (PerformEventT)
112−
113−#ifdef DEBUG_TRACE_EVENTS
114−import qualified Data.ByteString.Char8 as BS8
115−import System.IO (stderr)
116−import Data.List (isPrefixOf)
117−#endif
118−
119−-- TODO stdout might not be the best channel for debug output
120−debugStrLn :: String -> IO ()
121−debugStrLn = putStrLn
122−
123−#ifdef DEBUG_TRACE_EVENTS
124−withStackOneLine :: (BS8.ByteString -> a) -> a
125−withStackOneLine expr = unsafePerformIO $ do
126− stack <- currentCallStack
127− return (expr . BS8.pack . unwords . dropInternal . reverse $ stack)
128− where dropInternal = filterStack "Reflex.Spider.Internal"
129−
130−#endif
30+-- Note: must come last to silence warnings due to AMP on GHC < 7.10
31+import Prelude hiding (mapM, mapM_, any, sequence, concat)
13132
13233debugPropagate :: Bool
13334
13435debugInvalidateHeight :: Bool
13536
136−debugInvalidate :: Bool
137−
13837#ifdef DEBUG
38+
13939#define DEBUG_NODEIDS
14040
141−#ifdef DEBUG_TRACE_PROPAGATION
14241debugPropagate = True
143−#else
144−debugPropagate = False
145−#endif
14642
147−#ifdef DEBUG_TRACE_HEIGHT
14843debugInvalidateHeight = True
149−#else
150−debugInvalidateHeight = False
151−#endif
152−
153−#ifdef DEBUG_TRACE_INVALIDATION
154−debugInvalidate = True
155−#else
156−debugInvalidate = False
157−#endif
15844
15945class HasNodeId a where
16046 getNodeId :: a -> Int
16147
162−instance HasNodeId (CacheSubscribed x a) where
163− getNodeId = _cacheSubscribed_nodeId
164−
165−instance HasNodeId (FanInt x a) where
166− getNodeId = _fanInt_nodeId
167−
168−instance HasNodeId (Hold x p) where
48+instance HasNodeId (Hold a) where
16949 getNodeId = holdNodeId
17050
171−instance HasNodeId (SwitchSubscribed x a) where
51+instance HasNodeId (PushSubscribed a b) where
52+ getNodeId = pushSubscribedNodeId
53+
54+instance HasNodeId (SwitchSubscribed a) where
17255 getNodeId = switchSubscribedNodeId
17356
174−instance HasNodeId (FanSubscribed x v a) where
57+instance HasNodeId (MergeSubscribed a) where
58+ getNodeId = mergeSubscribedNodeId
59+
60+instance HasNodeId (FanSubscribed a) where
17561 getNodeId = fanSubscribedNodeId
17662
177−instance HasNodeId (CoincidenceSubscribed x a) where
63+instance HasNodeId (CoincidenceSubscribed a) where
17864 getNodeId = coincidenceSubscribedNodeId
17965
180−instance HasNodeId (RootSubscribed x a) where
66+instance HasNodeId (RootSubscribed a) where
18167 getNodeId = rootSubscribedNodeId
18268
183−instance HasNodeId (Pull x a) where
184− getNodeId = pullNodeId
185−
186−{-# INLINE showNodeId #-}
18769showNodeId :: HasNodeId a => a -> String
188−showNodeId = showNodeId' . getNodeId
189−
190−showNodeId' :: Int -> String
191−showNodeId' = ("#"<>) . show
192−
70+showNodeId = ("#"<>) . show . getNodeId
19371
19472#else
19573
19674debugPropagate = False
75+
19776debugInvalidateHeight = False
198−debugInvalidate = False
19977
200−-- This must be inline, or error messages will cause memory leaks due to retaining the node in question
201−{-# INLINE showNodeId #-}
20278showNodeId :: a -> String
203−showNodeId _ = ""
204−
205−{-# INLINE showNodeId' #-}
206−showNodeId' :: Int -> String
207−showNodeId' _ = ""
79+showNodeId = const ""
20880
20981#endif
21082
@@ -213,1632 +85,945 @@ showNodeId' _ = ""
21385nextNodeIdRef :: IORef Int
21486nextNodeIdRef = unsafePerformIO $ newIORef 1
21587
216−newNodeId :: IO Int
217−newNodeId = atomicModifyIORef' nextNodeIdRef $ \n -> (succ n, n)
218−#endif
219−
220−--------------------------------------------------------------------------------
221−-- EventSubscription
222−--------------------------------------------------------------------------------
223−
224−--NB: Once you subscribe to an Event, you must always hold on the the WHOLE EventSubscription you get back
225−-- If you do not retain the subscription, you may be prematurely unsubscribed from the parent event.
226−data EventSubscription x = EventSubscription
227− { _eventSubscription_unsubscribe :: !(IO ())
228− , _eventSubscription_subscribed :: {-# UNPACK #-} !(EventSubscribed x)
229− }
230−
231−unsubscribe :: EventSubscription x -> IO ()
232−unsubscribe (EventSubscription u _) = u
233−
234−--------------------------------------------------------------------------------
235−-- Event
236−--------------------------------------------------------------------------------
237−
238−newtype Event x a = Event { unEvent :: Subscriber x a -> EventM x (EventSubscription x, Maybe a) }
239−
240−{-# INLINE subscribeAndRead #-}
241−subscribeAndRead :: Event x a -> Subscriber x a -> EventM x (EventSubscription x, Maybe a)
242−subscribeAndRead = unEvent
243−
244−{-# RULES
245−"cacheEvent/cacheEvent" forall e. cacheEvent (cacheEvent e) = cacheEvent e
246−"cacheEvent/pushCheap" forall f e. pushCheap f (cacheEvent e) = cacheEvent (pushCheap f e)
247−"hold/cacheEvent" forall f e. hold f (cacheEvent e) = hold f e
248− #-}
249−
250−-- | Construct an 'Event' equivalent to that constructed by 'push', but with no
251−-- caching; if the computation function is very cheap, this is (much) more
252−-- efficient than 'push'
253−{-# INLINE [1] pushCheap #-}
254−pushCheap :: HasSpiderTimeline x => (a -> ComputeM x (Maybe b)) -> Event x a -> Event x b
255−pushCheap !f e = Event $ \sub -> do
256− (subscription, occ) <- subscribeAndRead e $ debugSubscriber' "push" $ sub
257− { subscriberPropagate = \a -> do
258− mb <- f a
259− mapM_ (subscriberPropagate sub) mb
260− }
261− occ' <- join <$> mapM f occ
262− return (subscription, occ')
263−
264−-- | A subscriber that never triggers other 'Event's
265−{-# INLINE terminalSubscriber #-}
266−terminalSubscriber :: (a -> EventM x ()) -> Subscriber x a
267−terminalSubscriber p = Subscriber
268− { subscriberPropagate = p
269− , subscriberInvalidateHeight = \_ -> return ()
270− , subscriberRecalculateHeight = \_ -> return ()
271− }
272−
273−-- | Subscribe to an Event only for the duration of one occurrence
274−{-# INLINE subscribeAndReadHead #-}
275−subscribeAndReadHead :: HasSpiderTimeline x => Event x a -> Subscriber x a -> EventM x (EventSubscription x, Maybe a)
276−subscribeAndReadHead e sub = do
277− subscriptionRef <- liftIO $ newIORef $ error "subscribeAndReadHead: not initialized"
278− (subscription, occ) <- subscribeAndRead e $ debugSubscriber' "head" $ sub
279− { subscriberPropagate = \a -> do
280− liftIO $ unsubscribe =<< readIORef subscriptionRef
281− subscriberPropagate sub a
282− }
283− liftIO $ case occ of
284− Nothing -> writeIORef subscriptionRef $! subscription
285− Just _ -> unsubscribe subscription
286− return (subscription, occ)
287−
288−--TODO: Make this lazy in its input event
289−headE :: (MonadIO m, Defer (SomeMergeInit x) m, HasSpiderTimeline x) => Event x a -> m (Event x a)
290−headE originalE = do
291− parent <- liftIO $ newIORef $ Just originalE
292− defer $ SomeMergeInit $ do --TODO: Rename SomeMergeInit appropriately
293− let clearParent = liftIO $ writeIORef parent Nothing
294− (_, occ) <- subscribeAndReadHead originalE $ terminalSubscriber $ const clearParent
295− when (isJust occ) clearParent
296− return $ Event $ \sub ->
297− liftIO (readIORef parent) >>= \case
298− Nothing -> subscribeAndReadNever
299− Just e -> subscribeAndReadHead e sub
300−
301−data CacheSubscribed x a
302− = CacheSubscribed { _cacheSubscribed_subscribers :: {-# UNPACK #-} !(FastWeakBag (Subscriber x a))
303− , _cacheSubscribed_parent :: {-# UNPACK #-} !(EventSubscription x)
304− , _cacheSubscribed_occurrence :: {-# UNPACK #-} !(IORef (Maybe a))
305−#ifdef DEBUG_NODEIDS
306− , _cacheSubscribed_nodeId :: {-# UNPACK #-} !Int
307−#endif
308− }
309−
310−nowSpiderEventM :: (HasSpiderTimeline x) => EventM x (R.Event (SpiderTimeline x) ())
311−nowSpiderEventM =
312− SpiderEvent <$> now
313−
314−now :: (MonadIO m, Defer (Some Clear) m, HasSpiderTimeline x
315− ) => m (Event x ())
316−now = do
317− nowOrNot <- liftIO $ newIORef $ Just ()
318− scheduleClear nowOrNot
319− return . Event $ \_ -> do
320− occ <- liftIO . readIORef $ nowOrNot
321− return ( EventSubscription (return ()) eventSubscribedNow
322− , occ
323− )
324−
325−-- | Construct an 'Event' whose value is guaranteed not to be recomputed
326−-- repeatedly
327−--
328−--TODO: Try a caching strategy where we subscribe directly to the parent when
329−--there's only one subscriber, and then build our own FastWeakBag only when a second
330−--subscriber joins
331−{-# NOINLINE [0] cacheEvent #-}
332−cacheEvent :: forall x a. HasSpiderTimeline x => Event x a -> Event x a
333−cacheEvent e =
334−#ifdef DEBUG_TRACE_EVENTS
335− withStackOneLine $ \callSite -> Event $
336−#else
337− Event $
88+{-# NOINLINE unsafeNodeId #-}
89+unsafeNodeId :: a -> Int
90+unsafeNodeId a = unsafePerformIO $ do
91+ touch a
92+ atomicModifyIORef' nextNodeIdRef $ \n -> (succ n, n)
33893#endif
339− unsafePerformIO $ do
340− mSubscribedRef :: IORef (FastWeak (CacheSubscribed x a))
341− <- newIORef emptyFastWeak
342− pure $ \sub -> {-# SCC "cacheEvent" #-} do
343−#ifdef DEBUG_TRACE_EVENTS
344− unless (BS8.null callSite) $ liftIO $ BS8.hPutStrLn stderr callSite
345−#endif
346− subscribedTicket <- liftIO (readIORef mSubscribedRef >>= getFastWeakTicket) >>= \case
347− Just subscribedTicket -> return subscribedTicket
348− Nothing -> do
349−#ifdef DEBUG_NODEIDS
350− nodeId <- liftIO newNodeId
351−#endif
352− subscribers <- liftIO FastWeakBag.empty
353− occRef <- liftIO $ newIORef Nothing -- This should never be read prior to being set below
354−#ifdef DEBUG_NODEIDS
355− (parentSub, occ) <- subscribeAndRead e $ debugSubscriber' ("cacheEvent" <> showNodeId' nodeId) $ Subscriber
356−#else
357− (parentSub, occ) <- subscribeAndRead e $ Subscriber
358−#endif
359− { subscriberPropagate = \a -> do
360− liftIO $ writeIORef occRef (Just a)
361− scheduleClear occRef
362− propagateFast a subscribers
363− , subscriberInvalidateHeight = FastWeakBag.traverse_ subscribers . invalidateSubscriberHeight
364− , subscriberRecalculateHeight = FastWeakBag.traverse_ subscribers . recalculateSubscriberHeight
365− }
366− when (isJust occ) $ do
367− liftIO $ writeIORef occRef occ -- Set the initial value of occRef; we don't need to do this if occ is Nothing
368− scheduleClear occRef
369− let !subscribed = CacheSubscribed
370− { _cacheSubscribed_subscribers = subscribers
371− , _cacheSubscribed_parent = parentSub
372− , _cacheSubscribed_occurrence = occRef
373−#ifdef DEBUG_NODEIDS
374− , _cacheSubscribed_nodeId = nodeId
375−#endif
376− }
377− subscribedTicket <- liftIO $ mkFastWeakTicket subscribed
378− liftIO $ writeIORef mSubscribedRef =<< getFastWeakTicketWeak subscribedTicket
379− return subscribedTicket
380− liftIO $ cacheSubscription sub mSubscribedRef subscribedTicket
381−
382−cacheSubscription :: Subscriber x a -> IORef (FastWeak (CacheSubscribed x a))
383− -> FastWeakTicket (CacheSubscribed x a) -> IO (EventSubscription x, Maybe a)
384−cacheSubscription sub mSubscribedRef subscribedTicket = do
385− subscribed <- getFastWeakTicketValue subscribedTicket
386− ticket <- FastWeakBag.insert sub $ _cacheSubscribed_subscribers subscribed
387− occ <- readIORef $ _cacheSubscribed_occurrence subscribed
388−
389− let parentSub = _cacheSubscribed_parent subscribed
390− es = EventSubscription
391− { _eventSubscription_unsubscribe = do
392− FastWeakBag.remove ticket
393−
394− isEmpty <- FastWeakBag.isEmpty $ _cacheSubscribed_subscribers subscribed
395− when isEmpty $ do
396− writeIORef mSubscribedRef emptyFastWeak
397− unsubscribe parentSub
398− touch ticket
399− touch subscribedTicket
400− , _eventSubscription_subscribed = EventSubscribed
401− { eventSubscribedHeightRef = eventSubscribedHeightRef $ _eventSubscription_subscribed parentSub
402− , eventSubscribedRetained = toAny subscribedTicket
403−#ifdef DEBUG_CYCLES
404− , eventSubscribedGetParents = return [_eventSubscription_subscribed parentSub]
405− , eventSubscribedHasOwnHeightRef = False
406− , eventSubscribedWhoCreated = whoCreatedIORef mSubscribedRef
407−#endif
408− }
409− }
410− return (es, occ)
411−
412−
413−subscribe :: Event x a -> Subscriber x a -> EventM x (EventSubscription x)
414−subscribe e s = fst <$> subscribeAndRead e s
415−
416−{-# INLINE wrap #-}
417−wrap :: MonadIO m => (t -> EventSubscribed x) -> (Subscriber x a -> m (WeakBagTicket, t, Maybe a)) -> Subscriber x a -> m (EventSubscription x, Maybe a)
418−wrap tag getSpecificSubscribed sub = do
419− (sln, subd, occ) <- getSpecificSubscribed sub
420− let es = tag subd
421− return (EventSubscription (WeakBag.remove sln >> touch sln) es, occ)
422−
423−eventRoot :: (GCompare k, HasSpiderTimeline x) => k a -> Root x k -> Event x a
424−eventRoot !k !r = Event $ wrap eventSubscribedRoot $ liftIO . getRootSubscribed k r
425−
426−subscribeAndReadNever :: EventM x (EventSubscription x, Maybe a)
427−subscribeAndReadNever = return (EventSubscription (return ()) eventSubscribedNever, Nothing)
428−
429−eventNever :: Event x a
430−eventNever = Event $ const subscribeAndReadNever
431−
432−eventFan :: (GCompare k, HasSpiderTimeline x) => k a -> Fan x k v -> Event x (v a)
433−eventFan !k !f = Event $ wrap eventSubscribedFan $ getFanSubscribed k f
434−
435−eventSwitch :: HasSpiderTimeline x => Switch x a -> Event x a
436−eventSwitch !s = Event $ wrap eventSubscribedSwitch $ getSwitchSubscribed s
437−
438−eventCoincidence :: HasSpiderTimeline x => Coincidence x a -> Event x a
439−eventCoincidence !c = Event $ wrap eventSubscribedCoincidence $ getCoincidenceSubscribed c
440−
441−eventHold :: Hold x p -> Event x p
442−eventHold !h = Event $ subscribeHoldEvent h
443−
444−eventDyn :: (HasSpiderTimeline x, Patch p) => Dyn x p -> Event x p
445−eventDyn !j = Event $ \sub -> getDynHold j >>= \h -> subscribeHoldEvent h sub
446−
447−{-# INLINE subscribeCoincidenceInner #-}
448−subscribeCoincidenceInner :: HasSpiderTimeline x => Event x a -> Height -> CoincidenceSubscribed x a -> EventM x (Maybe a, Height, EventSubscribed x)
449−subscribeCoincidenceInner inner outerHeight subscribedUnsafe = do
450− subInner <- liftIO $ newSubscriberCoincidenceInner subscribedUnsafe
451− (subscription@(EventSubscription _ innerSubd), innerOcc) <- subscribeAndRead inner subInner
452− innerHeight <- liftIO $ getEventSubscribedHeight innerSubd
453− let height = max innerHeight outerHeight
454− defer $ SomeResetCoincidence subscription $ if height > outerHeight then Just subscribedUnsafe else Nothing
455− return (innerOcc, height, innerSubd)
456−
457−--------------------------------------------------------------------------------
458−-- Subscriber
459−--------------------------------------------------------------------------------
460−
461−data Subscriber x a = Subscriber
462− { subscriberPropagate :: !(a -> EventM x ())
463− , subscriberInvalidateHeight :: !(Height -> IO ())
464− , subscriberRecalculateHeight :: !(Height -> IO ())
465− }
466−
467−newSubscriberHold :: (HasSpiderTimeline x, Patch p) => Hold x p -> IO (Subscriber x p)
468−newSubscriberHold h = return $ Subscriber
469− { subscriberPropagate = {-# SCC "traverseHold" #-} propagateSubscriberHold h
470− , subscriberInvalidateHeight = \_ -> return ()
471− , subscriberRecalculateHeight = \_ -> return ()
472− }
473−
474−newSubscriberFan :: forall x k v. (HasSpiderTimeline x, GCompare k) => FanSubscribed x k v -> IO (Subscriber x (DMap k v))
475−newSubscriberFan subscribed = debugSubscriber ("SubscriberFan " <> showNodeId subscribed) $ Subscriber
476− { subscriberPropagate = \a -> {-# SCC "traverseFan" #-} do
477− subs <- liftIO $ readIORef $ fanSubscribedSubscribers subscribed
478− tracePropagate (Proxy :: Proxy x) $ show (DMap.size subs) <> " keys subscribed, " <> show (DMap.size a) <> " keys firing"
479− liftIO $ writeIORef (fanSubscribedOccurrence subscribed) $ Just a
480− scheduleClear $ fanSubscribedOccurrence subscribed
481− let f _ (Pair v subsubs) = do
482− propagate v $ _fanSubscribedChildren_list subsubs
483− return $ Constant ()
484− _ <- DMap.traverseWithKey f $ DMap.intersectionWithKey (\_ -> Pair) a subs --TODO: Would be nice to have DMap.traverse_
485− return ()
486− , subscriberInvalidateHeight = \old -> do
487− subscribers <- readIORef $ fanSubscribedSubscribers subscribed
488− forM_ (DMap.toList subscribers) $ \(_ :=> v) -> WeakBag.traverse_ (_fanSubscribedChildren_list v) $ invalidateSubscriberHeight old
489− , subscriberRecalculateHeight = \new -> do
490− subscribers <- readIORef $ fanSubscribedSubscribers subscribed
491− forM_ (DMap.toList subscribers) $ \(_ :=> v) -> WeakBag.traverse_ (_fanSubscribedChildren_list v) $ recalculateSubscriberHeight new
492− }
493−
494−newSubscriberSwitch :: forall x a. HasSpiderTimeline x => SwitchSubscribed x a -> IO (Subscriber x a)
495−newSubscriberSwitch subscribed = debugSubscriber ("SubscriberCoincidenceOuter" <> showNodeId subscribed) $ Subscriber
496− { subscriberPropagate = \a -> {-# SCC "traverseSwitch" #-} do
497− liftIO $ writeIORef (switchSubscribedOccurrence subscribed) $ Just a
498− scheduleClear $ switchSubscribedOccurrence subscribed
499− propagate a $ switchSubscribedSubscribers subscribed
500− , subscriberInvalidateHeight = \_ -> do
501− oldHeight <- readIORef $ switchSubscribedHeight subscribed
502− when (oldHeight /= invalidHeight) $ do
503− writeIORef (switchSubscribedHeight subscribed) $! invalidHeight
504− WeakBag.traverse_ (switchSubscribedSubscribers subscribed) $ invalidateSubscriberHeight oldHeight
505− , subscriberRecalculateHeight = (`updateSwitchHeight` subscribed)
506− }
507−
508−newSubscriberCoincidenceOuter :: forall x b. HasSpiderTimeline x => CoincidenceSubscribed x b -> IO (Subscriber x (Event x b))
509−newSubscriberCoincidenceOuter subscribed = debugSubscriber ("SubscriberCoincidenceOuter" <> showNodeId subscribed) $ Subscriber
510− { subscriberPropagate = \a -> {-# SCC "traverseCoincidenceOuter" #-} do
511− outerHeight <- liftIO $ readIORef $ coincidenceSubscribedHeight subscribed
512− tracePropagate (Proxy :: Proxy x) $ " outerHeight = " <> show outerHeight
513− (occ, innerHeight, innerSubd) <- subscribeCoincidenceInner a outerHeight subscribed
514− tracePropagate (Proxy :: Proxy x) $ " isJust occ = " <> show (isJust occ)
515− tracePropagate (Proxy :: Proxy x) $ " innerHeight = " <> show innerHeight
516−
517− liftIO $ writeIORef (coincidenceSubscribedInnerParent subscribed) $ Just innerSubd
518− scheduleClear $ coincidenceSubscribedInnerParent subscribed
519− case occ of
520− Nothing ->
521− when (innerHeight > outerHeight) $ liftIO $ do -- If the event fires, it will fire at a later height
522− writeIORef (coincidenceSubscribedHeight subscribed) $! innerHeight
523− WeakBag.traverse_ (coincidenceSubscribedSubscribers subscribed) $ invalidateSubscriberHeight outerHeight
524− WeakBag.traverse_ (coincidenceSubscribedSubscribers subscribed) $ recalculateSubscriberHeight innerHeight
525− Just o -> do -- Since it's already firing, no need to adjust height
526− liftIO $ writeIORef (coincidenceSubscribedOccurrence subscribed) occ
527− scheduleClear $ coincidenceSubscribedOccurrence subscribed
528− propagate o $ coincidenceSubscribedSubscribers subscribed
529− , subscriberInvalidateHeight = \_ -> invalidateCoincidenceHeight subscribed
530− , subscriberRecalculateHeight = \_ -> recalculateCoincidenceHeight subscribed
531− }
532−
533−newSubscriberCoincidenceInner :: forall x a. HasSpiderTimeline x => CoincidenceSubscribed x a -> IO (Subscriber x a)
534−newSubscriberCoincidenceInner subscribed = debugSubscriber ("SubscriberCoincidenceInner" <> showNodeId subscribed) $ Subscriber
535− { subscriberPropagate = \a -> {-# SCC "traverseCoincidenceInner" #-} do
536− occ <- liftIO $ readIORef $ coincidenceSubscribedOccurrence subscribed
537− case occ of
538− Just _ -> return () -- SubscriberCoincidenceOuter must have already propagated this event
539− Nothing -> do
540− liftIO $ writeIORef (coincidenceSubscribedOccurrence subscribed) $ Just a
541− scheduleClear $ coincidenceSubscribedOccurrence subscribed
542− propagate a $ coincidenceSubscribedSubscribers subscribed
543− , subscriberInvalidateHeight = \_ -> invalidateCoincidenceHeight subscribed
544− , subscriberRecalculateHeight = \_ -> recalculateCoincidenceHeight subscribed
545− }
546−
547−invalidateSubscriberHeight :: Height -> Subscriber x a -> IO ()
548−invalidateSubscriberHeight = flip subscriberInvalidateHeight
549−
550−recalculateSubscriberHeight :: Height -> Subscriber x a -> IO ()
551−recalculateSubscriberHeight = flip subscriberRecalculateHeight
552−
553−-- | Propagate everything at the current height
554−propagate :: forall x a. HasSpiderTimeline x => a -> WeakBag (Subscriber x a) -> EventM x ()
555−propagate a subscribers = withIncreasedDepth (Proxy::Proxy x) $
556− -- Note: in the following traversal, we do not visit nodes that are added to the list during our traversal; they are new events, which will necessarily have full information already, so there is no need to traverse them
557− --TODO: Should we check if nodes already have their values before propagating? Maybe we're re-doing work
558− WeakBag.traverse_ subscribers $ \s -> subscriberPropagate s a
559−
560−-- | Propagate everything at the current height
561−propagateFast :: forall x a. HasSpiderTimeline x => a -> FastWeakBag (Subscriber x a) -> EventM x ()
562−propagateFast a subscribers = withIncreasedDepth (Proxy::Proxy x) $
563− -- Note: in the following traversal, we do not visit nodes that are added to the list during our traversal; they are new events, which will necessarily have full information already, so there is no need to traverse them
564− --TODO: Should we check if nodes already have their values before propagating? Maybe we're re-doing work
565− FastWeakBag.traverse_ subscribers $ \s -> subscriberPropagate s a
566−
567−--------------------------------------------------------------------------------
568−-- EventSubscribed
569−--------------------------------------------------------------------------------
570−
571−toAny :: a -> Any
572−toAny = unsafeCoerce
573−
574−-- Why do we use Any here, instead of just giving eventSubscribedRetained an
575−-- existential type? Sadly, GHC does not currently know how to unbox types
576−-- with existentially quantified fields. So instead we just coerce values
577−-- to type Any on the way in. Since we never coerce them back, this is
578−-- perfectly safe.
579−data EventSubscribed x = EventSubscribed
580− { eventSubscribedHeightRef :: {-# UNPACK #-} !(IORef Height)
581− , eventSubscribedRetained :: {-# NOUNPACK #-} !Any
582−#ifdef DEBUG_CYCLES
583− , eventSubscribedGetParents :: !(IO [EventSubscribed x]) -- For debugging loops
584− , eventSubscribedHasOwnHeightRef :: !Bool
585− , eventSubscribedWhoCreated :: !(IO [String])
586−#endif
587− }
588−
589−eventSubscribedRoot :: RootSubscribed x a -> EventSubscribed x
590−eventSubscribedRoot !r = EventSubscribed
591− { eventSubscribedHeightRef = zeroRef
592− , eventSubscribedRetained = toAny r
593−#ifdef DEBUG_CYCLES
594− , eventSubscribedGetParents = return []
595− , eventSubscribedHasOwnHeightRef = False
596− , eventSubscribedWhoCreated = return ["root"]
597−#endif
598− }
599−
600−eventSubscribedNever :: EventSubscribed x
601−eventSubscribedNever = EventSubscribed
602− { eventSubscribedHeightRef = zeroRef
603− , eventSubscribedRetained = toAny ()
604−#ifdef DEBUG_CYCLES
605− , eventSubscribedGetParents = return []
606− , eventSubscribedHasOwnHeightRef = False
607− , eventSubscribedWhoCreated = return ["never"]
608−#endif
609− }
610−eventSubscribedNow :: EventSubscribed x
611−eventSubscribedNow = EventSubscribed
612− { eventSubscribedHeightRef = zeroRef
613− , eventSubscribedRetained = toAny ()
614−#ifdef DEBUG_CYCLES
615− , eventSubscribedGetParents = return []
616− , eventSubscribedHasOwnHeightRef = False
617− , eventSubscribedWhoCreated = return ["now"]
618−#endif
619− }
620−
621−eventSubscribedFan :: FanSubscribed x k v -> EventSubscribed x
622−eventSubscribedFan !subscribed = EventSubscribed
623− { eventSubscribedHeightRef = eventSubscribedHeightRef $ _eventSubscription_subscribed $ fanSubscribedParent subscribed
624− , eventSubscribedRetained = toAny subscribed
625−#ifdef DEBUG_CYCLES
626− , eventSubscribedGetParents = return [_eventSubscription_subscribed $ fanSubscribedParent subscribed]
627− , eventSubscribedHasOwnHeightRef = False
628− , eventSubscribedWhoCreated = whoCreatedIORef $ fanSubscribedCachedSubscribed subscribed
629−#endif
630− }
631−
632−eventSubscribedSwitch :: SwitchSubscribed x a -> EventSubscribed x
633−eventSubscribedSwitch !subscribed = EventSubscribed
634− { eventSubscribedHeightRef = switchSubscribedHeight subscribed
635− , eventSubscribedRetained = toAny subscribed
636−#ifdef DEBUG_CYCLES
637− , eventSubscribedGetParents = do
638− s <- readIORef $ switchSubscribedCurrentParent subscribed
639− return [_eventSubscription_subscribed s]
640− , eventSubscribedHasOwnHeightRef = True
641− , eventSubscribedWhoCreated = whoCreatedIORef $ switchSubscribedCachedSubscribed subscribed
642−#endif
643− }
644−
645−eventSubscribedCoincidence :: CoincidenceSubscribed x a -> EventSubscribed x
646−eventSubscribedCoincidence !subscribed = EventSubscribed
647− { eventSubscribedHeightRef = coincidenceSubscribedHeight subscribed
648− , eventSubscribedRetained = toAny subscribed
649−#ifdef DEBUG_CYCLES
650− , eventSubscribedGetParents = do
651− innerSubscription <- readIORef $ coincidenceSubscribedInnerParent subscribed
652− let outerParent = _eventSubscription_subscribed $ coincidenceSubscribedOuterParent subscribed
653− innerParents = maybeToList $ innerSubscription
654− return $ outerParent : innerParents
655− , eventSubscribedHasOwnHeightRef = True
656− , eventSubscribedWhoCreated = whoCreatedIORef $ coincidenceSubscribedCachedSubscribed subscribed
657−#endif
658− }
659−
660−getEventSubscribedHeight :: EventSubscribed x -> IO Height
661−getEventSubscribedHeight es = readIORef $ eventSubscribedHeightRef es
662−
663−#ifdef DEBUG_CYCLES
664−whoCreatedEventSubscribed :: EventSubscribed x -> IO [String]
665−whoCreatedEventSubscribed = eventSubscribedWhoCreated
666−
667−walkInvalidHeightParents :: EventSubscribed x -> IO [EventSubscribed x]
668−walkInvalidHeightParents s0 = do
669− subscribers <- flip execStateT mempty $ ($ s0) $ fix $ \loop s -> do
670− h <- liftIO $ readIORef $ eventSubscribedHeightRef s
671− when (h == invalidHeight) $ do
672− when (eventSubscribedHasOwnHeightRef s) $ liftIO $ writeIORef (eventSubscribedHeightRef s) $! invalidHeightBeingTraversed
673− modify (s :)
674− mapM_ loop =<< liftIO (eventSubscribedGetParents s)
675− forM_ subscribers $ \s -> writeIORef (eventSubscribedHeightRef s) $! invalidHeight
676− return subscribers
677−#endif
678−
679−{-# INLINE subscribeHoldEvent #-}
680−subscribeHoldEvent :: Hold x p -> Subscriber x p -> EventM x (EventSubscription x, Maybe p)
681−subscribeHoldEvent = subscribeAndRead . holdEvent
682−
683−--------------------------------------------------------------------------------
684−-- Behavior
685−--------------------------------------------------------------------------------
686−
687−newtype Behavior x a = Behavior { readBehaviorTracked :: BehaviorM x a }
688−
689−behaviorHold :: Hold x p -> Behavior x (PatchTarget p)
690−behaviorHold !h = Behavior $ readHoldTracked h
691−
692−behaviorHoldIdentity :: Hold x (Identity a) -> Behavior x a
693−behaviorHoldIdentity = behaviorHold
694−
695−behaviorConst :: a -> Behavior x a
696−behaviorConst !a = Behavior $ return a
697−
698−behaviorPull :: Pull x a -> Behavior x a
699−behaviorPull !p = Behavior $ do
700− val <- liftIO $ readIORef $ pullValue p
701− case val of
702− Just subscribed -> do
703− askParentsRef >>= mapM_ (\r -> liftIO $ modifyIORef' r (SomeBehaviorSubscribed (Some (BehaviorSubscribedPull subscribed)) :))
704− askInvalidator >>= mapM_ (\wi -> liftIO $ modifyIORef' (pullSubscribedInvalidators subscribed) (wi:))
705− liftIO $ touch $ pullSubscribedOwnInvalidator subscribed
706− return $ pullSubscribedValue subscribed
707− Nothing -> do
708− i <- liftIO $ newInvalidatorPull p
709− wi <- liftIO $ mkWeakPtrWithDebug i "InvalidatorPull"
710− parentsRef <- liftIO $ newIORef []
711− holdInits <- askBehaviorHoldInits
712− a <- liftIO $ runReaderIO (unBehaviorM $ pullCompute p) (Just (wi, parentsRef), holdInits)
713− invsRef <- liftIO . newIORef . maybeToList =<< askInvalidator
714− parents <- liftIO $ readIORef parentsRef
715− let subscribed = PullSubscribed
716− { pullSubscribedValue = a
717− , pullSubscribedInvalidators = invsRef
718− , pullSubscribedOwnInvalidator = i
719− , pullSubscribedParents = parents
720− }
721− liftIO $ writeIORef (pullValue p) $ Just subscribed
722− askParentsRef >>= mapM_ (\r -> liftIO $ modifyIORef' r (SomeBehaviorSubscribed (Some (BehaviorSubscribedPull subscribed)) :))
723− return a
724−
725−behaviorDyn :: Patch p => Dyn x p -> Behavior x (PatchTarget p)
726−behaviorDyn !d = Behavior $ readHoldTracked =<< getDynHold d
727−
728−{-# INLINE readHoldTracked #-}
729−readHoldTracked :: Hold x p -> BehaviorM x (PatchTarget p)
730−readHoldTracked h = do
731− result <- liftIO $ readIORef $ holdValue h
732− askInvalidator >>= mapM_ (\wi -> liftIO $ modifyIORef' (holdInvalidators h) (wi:))
733− askParentsRef >>= mapM_ (\r -> liftIO $ modifyIORef' r (SomeBehaviorSubscribed (Some (BehaviorSubscribedHold h)) :))
734− liftIO $ touch h -- Otherwise, if this gets inlined enough, the hold's parent reference may get collected
735− return result
736−
737−{-# INLINABLE readBehaviorUntracked #-}
738−readBehaviorUntracked :: Defer (SomeHoldInit x) m => Behavior x a -> m a
739−readBehaviorUntracked b = do
740− holdInits <- getDeferralQueue
741− liftIO $ runBehaviorM (readBehaviorTracked b) Nothing holdInits --TODO: Specialize readBehaviorTracked to the Nothing and Just cases
742−
743−--------------------------------------------------------------------------------
744−-- Dynamic
745−--------------------------------------------------------------------------------
746−
747−type DynamicS x p = Dynamic x (PatchTarget p) p
748−
749−data Dynamic x target p = Dynamic
750− { dynamicCurrent :: !(Behavior x target)
751− , dynamicUpdated :: Event x p -- This must be lazy; see the comment on holdEvent --TODO: Would this let us eliminate `Dyn`?
752− }
753−
754−deriving instance (HasSpiderTimeline x) => Functor (Dynamic x target)
755−
756−
757−
758−
759−dynamicHold :: Hold x p -> DynamicS x p
760−dynamicHold !h = Dynamic
761− { dynamicCurrent = behaviorHold h
762− , dynamicUpdated = eventHold h
763− }
764−
765−dynamicHoldIdentity :: Hold x (Identity a) -> DynamicS x (Identity a)
766−dynamicHoldIdentity = dynamicHold
767−
768−dynamicConst :: PatchTarget p -> DynamicS x p
769−dynamicConst !a = Dynamic
770− { dynamicCurrent = behaviorConst a
771− , dynamicUpdated = eventNever
772− }
773−
774−dynamicDyn :: (HasSpiderTimeline x, Patch p) => Dyn x p -> DynamicS x p
775−dynamicDyn !d = Dynamic
776− { dynamicCurrent = behaviorDyn d
777− , dynamicUpdated = eventDyn d
778− }
779−
780−dynamicDynIdentity :: HasSpiderTimeline x => Dyn x (Identity a) -> DynamicS x (Identity a)
781−dynamicDynIdentity = dynamicDyn
782−
783−--------------------------------------------------------------------------------
784−-- Combinators
785−--------------------------------------------------------------------------------
78694
95+--TODO: Figure out why certain things are not 'representational', then make them representational so we can use coerce
78796--type role Hold representational
788−data Hold x p
789− = Hold { holdValue :: !(IORef (PatchTarget p))
790− , holdInvalidators :: !(IORef [Weak (Invalidator x)])
791− , holdEvent :: Event x p -- This must be lazy, or holds cannot be defined before their input Events
792− , holdParent :: !(IORef (Maybe (EventSubscription x))) -- Keeps its parent alive (will be undefined until the hold is initialized) --TODO: Probably shouldn't be an IORef
97+data Hold a
98+ = Hold { holdValue :: !(IORef a)
99+ , holdInvalidators :: !(IORef [Weak Invalidator])
100+ -- We need to use 'Any' for the next two things, because otherwise Hold inherits a nominal role for its 'a' parameter, and we want to be able to use 'coerce'
101+ , holdSubscriber :: !(IORef Any) -- Keeps its subscription alive; for some reason, a regular (or strict) reference to the Subscriber itself wasn't working, so had to use an IORef
102+ , holdParent :: !(IORef Any) -- Keeps its parent alive (will be undefined until the hold is initialized --TODO: Probably shouldn't be an IORef
793103#ifdef DEBUG_NODEIDS
794104 , holdNodeId :: Int
795105#endif
796106 }
797107
798−-- | A statically allocated 'SpiderTimeline'
799−data Global
800−
801−{-# NOINLINE globalSpiderTimelineEnv #-}
802−globalSpiderTimelineEnv :: SpiderTimelineEnv Global
803−globalSpiderTimelineEnv = unsafePerformIO unsafeNewSpiderTimelineEnv
804−
805−-- | Stores all global data relevant to a particular Spider timeline; only one
806−-- value should exist for each type @x@
807−newtype SpiderTimelineEnv x = STE {unSTE :: SpiderTimelineEnv' x}
808−-- We implement SpiderTimelineEnv with a newtype wrapper so
809−-- we can get the coercions we want safely.
810−type role SpiderTimelineEnv nominal
811−
812−data SpiderTimelineEnv' x = SpiderTimelineEnv
813− { _spiderTimeline_lock :: {-# UNPACK #-} !(MVar ())
814− , _spiderTimeline_eventEnv :: {-# UNPACK #-} !(EventEnv x)
815−#ifdef DEBUG
816− , _spiderTimeline_depth :: {-# UNPACK #-} !(IORef Int)
817−#endif
818− }
819−type role SpiderTimelineEnv' phantom
820−
821−instance Eq (SpiderTimelineEnv x) where
822− _ == _ = True -- Since only one exists of each type
823−
824−instance GEq SpiderTimelineEnv where
825− a `geq` b = if _spiderTimeline_lock (unSTE a) == _spiderTimeline_lock (unSTE b)
826− then Just $ unsafeCoerce Refl -- This unsafeCoerce is safe because the same SpiderTimelineEnv can't have two different 'x' arguments
827− else Nothing
828−
829−data EventEnv x
830− = EventEnv { eventEnvAssignments :: !(IORef [SomeAssignment x]) -- Needed for Subscribe
831− , eventEnvHoldInits :: !(IORef [SomeHoldInit x]) -- Needed for Subscribe
832− , eventEnvDynInits :: !(IORef [SomeDynInit x])
833− , eventEnvMergeUpdates :: !(IORef [SomeMergeUpdate x])
834− , eventEnvMergeInits :: !(IORef [SomeMergeInit x]) -- Needed for Subscribe
835− , eventEnvClears :: !(IORef [Some Clear]) -- Needed for Subscribe
836− , eventEnvIntClears :: !(IORef [Some IntClear])
837− , eventEnvRootClears :: !(IORef [Some RootClear])
838− , eventEnvCurrentHeight :: !(IORef Height) -- Needed for Subscribe
839− , eventEnvResetCoincidences :: !(IORef [SomeResetCoincidence x]) -- Needed for Subscribe
840− , eventEnvDelayedMerges :: !(IORef (IntMap [EventM x ()]))
108+data EventEnv
109+ = EventEnv { eventEnvAssignments :: !(IORef [SomeAssignment])
110+ , eventEnvHoldInits :: !(IORef [SomeHoldInit])
111+ , eventEnvClears :: !(IORef [SomeMaybeIORef])
112+ , eventEnvRootClears :: !(IORef [SomeDMapIORef])
113+ , eventEnvCurrentHeight :: !(IORef Int)
114+ , eventEnvCoincidenceInfos :: !(IORef [SomeCoincidenceInfo])
115+ , eventEnvDelayedMerges :: !(IORef (IntMap [DelayedMerge]))
841116 }
842117
843−{-# INLINE runEventM #-}
844−runEventM :: EventM x a -> IO a
845−runEventM = unEventM
846−
847−asksEventEnv :: forall x a. HasSpiderTimeline x => (EventEnv x -> a) -> EventM x a
848−asksEventEnv f = return $ f $ _spiderTimeline_eventEnv (unSTE (spiderTimeline :: SpiderTimelineEnv x))
849−
850−class MonadIO m => Defer a m where
851− getDeferralQueue :: m (IORef [a])
852−
853−{-# INLINE defer #-}
854−defer :: Defer a m => a -> m ()
855−defer a = do
856− q <- getDeferralQueue
857− liftIO $ modifyIORef' q (a:)
858−
859−instance HasSpiderTimeline x => Defer (SomeAssignment x) (EventM x) where
860− {-# INLINE getDeferralQueue #-}
861− getDeferralQueue = asksEventEnv eventEnvAssignments
862−
863−instance HasSpiderTimeline x => Defer (SomeHoldInit x) (EventM x) where
864− {-# INLINE getDeferralQueue #-}
865− getDeferralQueue = asksEventEnv eventEnvHoldInits
866−
867−instance HasSpiderTimeline x => Defer (SomeDynInit x) (EventM x) where
868− {-# INLINE getDeferralQueue #-}
869− getDeferralQueue = asksEventEnv eventEnvDynInits
870−
871−instance Defer (SomeHoldInit x) (BehaviorM x) where
872− {-# INLINE getDeferralQueue #-}
873− getDeferralQueue = BehaviorM $ asks snd
874−
875−instance HasSpiderTimeline x => Defer (SomeMergeUpdate x) (EventM x) where
876− {-# INLINE getDeferralQueue #-}
877− getDeferralQueue = asksEventEnv eventEnvMergeUpdates
118+runEventM :: EventM a -> EventEnv -> IO a
119+runEventM = runReaderT . unEventM
878120
879−instance HasSpiderTimeline x => Defer (SomeMergeInit x) (EventM x) where
880− {-# INLINE getDeferralQueue #-}
881− getDeferralQueue = asksEventEnv eventEnvMergeInits
121+askToAssignRef :: EventM (IORef [SomeAssignment])
122+askToAssignRef = EventM $ asks eventEnvAssignments
882123
883−class HasSpiderTimeline x => HasCurrentHeight x m | m -> x where
884− getCurrentHeight :: m Height
885− scheduleMerge :: Height -> EventM x () -> m ()
124+askHoldInitRef :: EventM (IORef [SomeHoldInit])
125+askHoldInitRef = EventM $ asks eventEnvHoldInits
886126
887−instance HasSpiderTimeline x => HasCurrentHeight x (EventM x) where
888− {-# INLINE getCurrentHeight #-}
889− getCurrentHeight = do
890− heightRef <- asksEventEnv eventEnvCurrentHeight
891− liftIO $ readIORef heightRef
892− {-# INLINE scheduleMerge #-}
893− scheduleMerge height subscribed = do
894− delayedRef <- asksEventEnv eventEnvDelayedMerges
895− liftIO $ modifyIORef' delayedRef $ IntMap.insertWith (++) (unHeight height) [subscribed]
127+getCurrentHeight :: EventM Int
128+getCurrentHeight = EventM $ do
129+ heightRef <- asks eventEnvCurrentHeight
130+ liftIO $ readIORef heightRef
896131
897−class HasSpiderTimeline x where
898− -- | Retrieve the current SpiderTimelineEnv
899− spiderTimeline :: SpiderTimelineEnv x
132+putCurrentHeight :: Int -> EventM ()
133+putCurrentHeight h = EventM $ do
134+ heightRef <- asks eventEnvCurrentHeight
135+ liftIO $ writeIORef heightRef h
900136
901−instance HasSpiderTimeline Global where
902− spiderTimeline = globalSpiderTimelineEnv
137+scheduleClear :: IORef (Maybe a) -> EventM ()
138+scheduleClear r = EventM $ do
139+ clears <- asks eventEnvClears
140+ liftIO $ modifyIORef' clears (SomeMaybeIORef r :)
903141
904−putCurrentHeight :: HasSpiderTimeline x => Height -> EventM x ()
905−putCurrentHeight h = do
906− heightRef <- asksEventEnv eventEnvCurrentHeight
907− liftIO $ writeIORef heightRef $! h
142+scheduleRootClear :: IORef (DMap k Identity) -> EventM ()
143+scheduleRootClear r = EventM $ do
144+ clears <- asks eventEnvRootClears
145+ liftIO $ modifyIORef' clears (SomeDMapIORef r :)
908146
909−instance HasSpiderTimeline x => Defer (Some Clear) (EventM x) where
910− {-# INLINE getDeferralQueue #-}
911− getDeferralQueue = asksEventEnv eventEnvClears
147+scheduleMerge :: Int -> MergeSubscribed a -> EventM ()
148+scheduleMerge height subscribed = EventM $ do
149+ delayedRef <- asks eventEnvDelayedMerges
150+ liftIO $ modifyIORef' delayedRef $ IntMap.insertWith (++) height [DelayedMerge subscribed]
912151
913−{-# INLINE scheduleClear #-}
914−scheduleClear :: Defer (Some Clear) m => IORef (Maybe a) -> m ()
915−scheduleClear r = defer $ Some $ Clear r
916−
917−instance HasSpiderTimeline x => Defer (Some IntClear) (EventM x) where
918− {-# INLINE getDeferralQueue #-}
919− getDeferralQueue = asksEventEnv eventEnvIntClears
920−
921−{-# INLINE scheduleIntClear #-}
922−scheduleIntClear :: Defer (Some IntClear) m => IORef (IntMap a) -> m ()
923−scheduleIntClear r = defer $ Some $ IntClear r
924−
925−instance HasSpiderTimeline x => Defer (Some RootClear) (EventM x) where
926− {-# INLINE getDeferralQueue #-}
927− getDeferralQueue = asksEventEnv eventEnvRootClears
928−
929−{-# INLINE scheduleRootClear #-}
930−scheduleRootClear :: Defer (Some RootClear) m => IORef (DMap k Identity) -> m ()
931−scheduleRootClear r = defer $ Some $ RootClear r
932−
933−instance HasSpiderTimeline x => Defer (SomeResetCoincidence x) (EventM x) where
934− {-# INLINE getDeferralQueue #-}
935− getDeferralQueue = asksEventEnv eventEnvResetCoincidences
152+emitCoincidenceInfo :: SomeCoincidenceInfo -> EventM ()
153+emitCoincidenceInfo sci = EventM $ do
154+ ciRef <- asks eventEnvCoincidenceInfos
155+ liftIO $ modifyIORef' ciRef (sci:)
936156
937157-- Note: hold cannot examine its event until after the phase is over
938−{-# INLINE [1] hold #-}
939−hold :: (Patch p, Defer (SomeHoldInit x) m) => PatchTarget p -> Event x p -> m (Hold x p)
158+hold :: a -> Event a -> EventM (Behavior a)
940159hold v0 e = do
941− valRef <- liftIO $ newIORef v0
942− invsRef <- liftIO $ newIORef []
943− parentRef <- liftIO $ newIORef Nothing
944−#ifdef DEBUG_NODEIDS
945− nodeId <- liftIO newNodeId
946−#endif
947− let h = Hold
948− { holdValue = valRef
949− , holdInvalidators = invsRef
950− , holdEvent = e
951− , holdParent = parentRef
160+ holdInitRef <- askHoldInitRef
161+ liftIO $ do
162+ valRef <- newIORef v0
163+ invsRef <- newIORef []
164+ parentRef <- newIORef $ error "hold not yet initialized (parent)"
165+ subscriberRef <- newIORef $ error "hold not yet initialized (subscriber)"
166+ let h = Hold
167+ { holdValue = valRef
168+ , holdInvalidators = invsRef
169+ , holdSubscriber = subscriberRef
170+ , holdParent = parentRef
952171#ifdef DEBUG_NODEIDS
953− , holdNodeId = nodeId
172+ , holdNodeId = unsafeNodeId (v0, e)
954173#endif
955− }
956− defer $ SomeHoldInit h
957− return h
958−
959−{-# INLINE getHoldEventSubscription #-}
960−getHoldEventSubscription :: forall p x. (HasSpiderTimeline x, Patch p) => Hold x p -> EventM x (EventSubscription x)
961−getHoldEventSubscription h = do
962− ep <- liftIO $ readIORef $ holdParent h
963− case ep of
964− Just subd -> return subd
965− Nothing -> do
966− let e = holdEvent h
967− subscriptionRef <- liftIO $ newIORef $ error "getHoldEventSubscription: subdRef uninitialized"
968− (subscription@(EventSubscription _ _), occ) <- subscribeAndRead e =<< liftIO (newSubscriberHold h)
969− liftIO $ writeIORef subscriptionRef $! subscription
970− case occ of
971− Nothing -> return ()
972− Just o -> do
973− old <- liftIO $ readIORef $ holdValue h
974− case apply o old of
975− Nothing -> return ()
976− Just new -> do
977− -- Need to evaluate these so that we don't retain the Hold itself
978− v <- liftIO $ evaluate $ holdValue h
979− i <- liftIO $ evaluate $ holdInvalidators h
980− defer $ SomeAssignment v i new
981− liftIO $ writeIORef (holdParent h) $ Just subscription
982− return subscription
983−
984−type BehaviorEnv x = (Maybe (Weak (Invalidator x), IORef [SomeBehaviorSubscribed x]), IORef [SomeHoldInit x])
174+ }
175+ s <- newSubscriberHold h
176+ writeIORef subscriberRef $ unsafeCoerce s
177+ modifyIORef' holdInitRef (SomeHoldInit e h :)
178+ return $ BehaviorHold h
179+
180+subscribeHold :: Event a -> Hold a -> EventM ()
181+subscribeHold e h = do
182+ toAssignRef <- askToAssignRef
183+ !s <- liftIO $ liftM unsafeCoerce $ readIORef $ holdSubscriber h -- This must be performed strictly so that the weak pointer points at the actual item
184+ ws <- liftIO $ mkWeakPtrWithDebug s "holdSubscriber"
185+ subd <- subscribe e $ WeakSubscriberSimple ws
186+ liftIO $ writeIORef (holdParent h) $ unsafeCoerce subd
187+ occ <- liftIO $ getEventSubscribedOcc subd
188+ case occ of
189+ Nothing -> return ()
190+ Just o -> liftIO $ modifyIORef' toAssignRef (SomeAssignment h o :)
985191
192+--type role BehaviorM representational
986193-- BehaviorM can sample behaviors
987−newtype BehaviorM x a = BehaviorM { unBehaviorM :: ReaderIO (BehaviorEnv x) a }
988− deriving (Functor, Applicative, MonadIO, MonadFix, MonadReader (BehaviorEnv x))
989−
990−instance Monad (BehaviorM x) where
991− {-# INLINE (>>=) #-}
992− BehaviorM x >>= f = BehaviorM $ x >>= unBehaviorM . f
993− {-# INLINE (>>) #-}
994− BehaviorM x >> BehaviorM y = BehaviorM $ x >> y
995− {-# INLINE return #-}
996− return x = BehaviorM $ return x
997−#if !MIN_VERSION_base(4,13,0)
998− {-# INLINE fail #-}
999− fail s = BehaviorM $ fail s
1000−#endif
194+newtype BehaviorM a = BehaviorM { unBehaviorM :: ReaderT (Maybe (Weak Invalidator, IORef [SomeBehaviorSubscribed])) IO a } deriving (Functor, Applicative, Monad, MonadIO, MonadFix)
1001195
1002−data BehaviorSubscribed x a
1003− = forall p. BehaviorSubscribedHold (Hold x p)
1004− | BehaviorSubscribedPull (PullSubscribed x a)
196+data BehaviorSubscribed a
197+ = BehaviorSubscribedHold (Hold a)
198+ | BehaviorSubscribedPull (PullSubscribed a)
1005199
1006−newtype SomeBehaviorSubscribed x = SomeBehaviorSubscribed (Some (BehaviorSubscribed x))
200+data SomeBehaviorSubscribed = forall a. SomeBehaviorSubscribed (BehaviorSubscribed a)
1007201
1008202--type role PullSubscribed representational
1009−data PullSubscribed x a
203+data PullSubscribed a
1010204 = PullSubscribed { pullSubscribedValue :: !a
1011− , pullSubscribedInvalidators :: !(IORef [Weak (Invalidator x)])
1012− , pullSubscribedOwnInvalidator :: !(Invalidator x)
1013− , pullSubscribedParents :: ![SomeBehaviorSubscribed x] -- Need to keep parent behaviors alive, or they won't let us know when they're invalidated
205+ , pullSubscribedInvalidators :: !(IORef [Weak Invalidator])
206+ , pullSubscribedOwnInvalidator :: !Invalidator
207+ , pullSubscribedParents :: ![SomeBehaviorSubscribed] -- Need to keep parent behaviors alive, or they won't let us know when they're invalidated
1014208 }
1015209
1016−--type role Pull representational
1017−data Pull x a
1018− = Pull { pullValue :: !(IORef (Maybe (PullSubscribed x a)))
1019− , pullCompute :: !(BehaviorM x a)
1020−#ifdef DEBUG_NODEIDS
1021− , pullNodeId :: Int
1022−#endif
1023− }
1024−
1025−data Invalidator x
1026− = forall a. InvalidatorPull (Pull x a)
1027− | forall a. InvalidatorSwitch (SwitchSubscribed x a)
1028−
1029−data RootSubscribed x a = forall k. GCompare k => RootSubscribed
1030− { rootSubscribedKey :: !(k a)
1031− , rootSubscribedCachedSubscribed :: !(IORef (DMap k (RootSubscribed x))) -- From the original Root
1032− , rootSubscribedSubscribers :: !(WeakBag (Subscriber x a))
1033− , rootSubscribedOccurrence :: !(IO (Maybe a)) -- Lookup from rootOccurrence
1034− , rootSubscribedUninit :: IO ()
1035− , rootSubscribedWeakSelf :: !(IORef (Weak (RootSubscribed x a))) --TODO: Can we make this a lazy non-IORef and then force it manually to avoid an indirection each time we use it?
1036−#ifdef DEBUG_NODEIDS
1037− , rootSubscribedNodeId :: Int
1038−#endif
1039− }
1040−
1041−data Root x k
1042− = Root { rootOccurrence :: !(IORef (DMap k Identity)) -- The currently-firing occurrence of this event
1043− , rootSubscribed :: !(IORef (DMap k (RootSubscribed x)))
1044− , rootInit :: !(forall a. k a -> RootTrigger x a -> IO (IO ()))
1045− }
1046−
1047−data SomeHoldInit x = forall p. Patch p => SomeHoldInit !(Hold x p)
1048−
1049−data SomeDynInit x = forall p. Patch p => SomeDynInit !(Dyn x p)
1050−
1051−data SomeMergeUpdate x = SomeMergeUpdate
1052− { _someMergeUpdate_update :: !(EventM x [EventSubscription x])
1053− , _someMergeUpdate_invalidateHeight :: !(IO ())
1054− , _someMergeUpdate_recalculateHeight :: !(IO ())
1055− }
1056−
1057−newtype SomeMergeInit x = SomeMergeInit { unSomeMergeInit :: EventM x () }
1058−
1059−-- EventM can do everything BehaviorM can, plus create holds
1060−newtype EventM x a = EventM { unEventM :: IO a } deriving (Functor, Applicative, Monad, MonadIO, MonadFix, MonadException, MonadAsyncException)
1061−
1062−newtype MergeSubscribedParent x a = MergeSubscribedParent { unMergeSubscribedParent :: EventSubscription x }
1063−
1064−data MergeSubscribedParentWithMove x k a = MergeSubscribedParentWithMove
1065− { _mergeSubscribedParentWithMove_subscription :: !(EventSubscription x)
1066− , _mergeSubscribedParentWithMove_key :: !(IORef (k a))
1067− }
1068−
1069−data HeightBag = HeightBag
1070− { _heightBag_size :: {-# UNPACK #-} !Int
1071− , _heightBag_contents :: !(IntMap Word) -- Number of excess in each bucket
1072− }
1073− deriving (Show, Read, Eq, Ord)
1074−
1075−heightBagEmpty :: HeightBag
1076−heightBagEmpty = heightBagVerify $ HeightBag 0 IntMap.empty
1077−
1078−heightBagSize :: HeightBag -> Int
1079−heightBagSize = _heightBag_size
210+--type role Pull representational
211+data Pull a
212+ = Pull { pullValue :: !(IORef (Maybe (PullSubscribed a)))
213+ , pullCompute :: !(BehaviorM a)
214+ }
1080215
1081−heightBagFromList :: [Height] -> HeightBag
1082−heightBagFromList heights = heightBagVerify $ foldl' (flip heightBagAdd) heightBagEmpty heights
216+data Invalidator
217+ = forall a. InvalidatorPull (Pull a)
218+ | forall a. InvalidatorSwitch (SwitchSubscribed a)
1083219
1084−heightBagAdd :: Height -> HeightBag -> HeightBag
1085−heightBagAdd (Height h) (HeightBag s c) = heightBagVerify $ HeightBag (succ s) $
1086− IntMap.insertWithKey (\_ _ old -> succ old) h 0 c
220+data RootSubscribed a
221+ = RootSubscribed { rootSubscribedSubscribers :: !(IORef [WeakSubscriber a])
222+ , rootSubscribedOccurrence :: !(IO (Maybe a)) -- Lookup from rootOccurrence
223+ }
1087224
1088−heightBagRemove :: Height -> HeightBag -> HeightBag
1089−heightBagRemove (Height h) b@(HeightBag s c) = heightBagVerify $ case IntMap.lookup h c of
1090− Nothing -> error $ "heightBagRemove: Height " <> show h <> " not present in bag " <> show b
1091− Just old -> HeightBag (pred s) $ case old of
1092− 0 -> IntMap.delete h c
1093− _ -> IntMap.insert h (pred old) c
225+data Root (k :: * -> *)
226+ = Root { rootOccurrence :: !(IORef (DMap k Identity)) -- The currently-firing occurrence of this event
227+ , rootSubscribed :: !(IORef (DMap k RootSubscribed))
228+ , rootInit :: !(forall a. k a -> RootTrigger a -> IO (IO ()))
229+ }
1094230
1095−heightBagRemoveMaybe :: Height -> HeightBag -> Maybe HeightBag
1096−heightBagRemoveMaybe (Height h) b@(HeightBag s c) = heightBagVerify . removed <$> IntMap.lookup h c where
1097− removed old = HeightBag (pred s) $ case old of
1098− 0 -> IntMap.delete h c
1099− _ -> IntMap.insert h (pred old) c
231+data SomeHoldInit = forall a. SomeHoldInit (Event a) (Hold a)
1100232
233+-- EventM can do everything BehaviorM can, plus create holds
234+newtype EventM a = EventM { unEventM :: ReaderT EventEnv IO a } deriving (Functor, Applicative, Monad, MonadFix, MonadIO, MonadException, MonadAsyncException) -- The environment should be Nothing if we are not in a frame, and Just if we are - in which case it is a list of assignments to be done after the frame is over
235+
236+data PushSubscribed a b
237+ = PushSubscribed { pushSubscribedOccurrence :: !(IORef (Maybe b)) -- If the current height is less than our height, this should always be Nothing; during our height, this will get filled in at some point, always before our children are notified; after our height, this will be filled in with the correct value (Nothing if we are not firing, Just if we are)
238+ , pushSubscribedHeight :: !(IORef Int)
239+ , pushSubscribedSubscribers :: !(IORef [WeakSubscriber b])
240+ , pushSubscribedSelf :: !(Subscriber a) -- Hold this in memory to ensure our WeakReferences don't die
241+ , pushSubscribedParent :: !(EventSubscribed a)
242+#ifdef DEBUG_NODEIDS
243+ , pushSubscribedNodeId :: Int
244+#endif
245+ }
1101246
1102−heightBagMax :: HeightBag -> Height
1103−heightBagMax (HeightBag _ c) = case IntMap.maxViewWithKey c of
1104− Just ((h, _), _) -> Height h
1105− Nothing -> zeroHeight
247+data Push a b
248+ = Push { pushCompute :: !(a -> EventM (Maybe b)) -- Compute the current firing value; assumes that its parent has been computed
249+ , pushParent :: !(Event a)
250+ , pushSubscribed :: !(IORef (Maybe (PushSubscribed a b))) --TODO: Can we replace this with an unsafePerformIO thunk?
251+ }
1106252
1107−heightBagVerify :: HeightBag -> HeightBag
1108−#ifdef DEBUG
1109−heightBagVerify b@(HeightBag s c) = if
1110− | s /= IntMap.size c + fromIntegral (sum (IntMap.elems c))
1111− -> error $ "heightBagVerify: size doesn't match: " <> show b
1112− | unHeight invalidHeight `IntMap.member` c
1113− -> error $ "heightBagVerify: contains invalid height: " <> show b
1114− | otherwise -> b
1115−#else
1116−heightBagVerify = id
253+data MergeSubscribed k
254+ = MergeSubscribed { mergeSubscribedOccurrence :: !(IORef (Maybe (DMap k Identity)))
255+ , mergeSubscribedAccum :: !(IORef (DMap k Identity)) -- This will accumulate occurrences until our height is reached, at which point it will be transferred to mergeSubscribedOccurrence
256+ , mergeSubscribedHeight :: !(IORef Int)
257+ , mergeSubscribedSubscribers :: !(IORef [WeakSubscriber (DMap k Identity)])
258+ , mergeSubscribedSelf :: !Any -- Hold all our Subscribers in memory
259+ , mergeSubscribedParents :: !(DMap k EventSubscribed)
260+#ifdef DEBUG_NODEIDS
261+ , mergeSubscribedNodeId :: Int
1117262#endif
263+ }
1118264
1119−data FanSubscribedChildren x k v a = FanSubscribedChildren
1120− { _fanSubscribedChildren_list :: !(WeakBag (Subscriber x (v a)))
1121− , _fanSubscribedChildren_self :: {-# NOUNPACK #-} !(k a, FanSubscribed x k v)
1122− , _fanSubscribedChildren_weakSelf :: !(IORef (Weak (k a, FanSubscribed x k v)))
1123− }
1124−
1125−data FanSubscribed x k v
1126− = FanSubscribed { fanSubscribedCachedSubscribed :: !(IORef (Maybe (FanSubscribed x k v)))
1127− , fanSubscribedOccurrence :: !(IORef (Maybe (DMap k v)))
1128− , fanSubscribedSubscribers :: !(IORef (DMap k (FanSubscribedChildren x k v))) -- This DMap should never be empty
1129− , fanSubscribedParent :: !(EventSubscription x)
265+--TODO: DMap sucks; we should really write something better (with a functor for the value as well as the key)
266+data Merge k
267+ = Merge { mergeParents :: !(DMap k Event)
268+ , mergeSubscribed :: !(IORef (Maybe (MergeSubscribed k))) --TODO: Can we replace this with an unsafePerformIO thunk?
269+ }
270+
271+data FanSubscriberKey k a where
272+ FanSubscriberKey :: k a -> FanSubscriberKey k [WeakSubscriber a]
273+
274+instance GEq k => GEq (FanSubscriberKey k) where
275+ geq (FanSubscriberKey a) (FanSubscriberKey b) = case geq a b of
276+ Nothing -> Nothing
277+ Just Refl -> Just Refl
278+
279+instance GCompare k => GCompare (FanSubscriberKey k) where
280+ gcompare (FanSubscriberKey a) (FanSubscriberKey b) = case gcompare a b of
281+ GLT -> GLT
282+ GEQ -> GEQ
283+ GGT -> GGT
284+
285+data FanSubscribed k
286+ = FanSubscribed { fanSubscribedSubscribers :: !(IORef (DMap (FanSubscriberKey k) Identity))
287+ , fanSubscribedParent :: !(EventSubscribed (DMap k Identity))
288+ , fanSubscribedSelf :: {-# NOUNPACK #-} (Subscriber (DMap k Identity))
1130289#ifdef DEBUG_NODEIDS
1131290 , fanSubscribedNodeId :: Int
1132291#endif
1133292 }
1134293
1135−data Fan x k v
1136− = Fan { fanParent :: !(Event x (DMap k v))
1137− , fanSubscribed :: !(IORef (Maybe (FanSubscribed x k v)))
294+data Fan k
295+ = Fan { fanParent :: !(Event (DMap k Identity))
296+ , fanSubscribed :: !(IORef (Maybe (FanSubscribed k)))
1138297 }
1139298
1140−data SwitchSubscribed x a
1141− = SwitchSubscribed { switchSubscribedCachedSubscribed :: !(IORef (Maybe (SwitchSubscribed x a)))
1142− , switchSubscribedOccurrence :: !(IORef (Maybe a))
1143− , switchSubscribedHeight :: !(IORef Height)
1144− , switchSubscribedSubscribers :: !(WeakBag (Subscriber x a))
1145− , switchSubscribedOwnInvalidator :: {-# NOUNPACK #-} !(Invalidator x)
1146− , switchSubscribedOwnWeakInvalidator :: !(IORef (Weak (Invalidator x)))
1147− , switchSubscribedBehaviorParents :: !(IORef [SomeBehaviorSubscribed x])
1148− , switchSubscribedParent :: !(Behavior x (Event x a))
1149− , switchSubscribedCurrentParent :: !(IORef (EventSubscription x))
1150− , switchSubscribedWeakSelf :: !(IORef (Weak (SwitchSubscribed x a)))
299+data SwitchSubscribed a
300+ = SwitchSubscribed { switchSubscribedOccurrence :: !(IORef (Maybe a))
301+ , switchSubscribedHeight :: !(IORef Int)
302+ , switchSubscribedSubscribers :: !(IORef [WeakSubscriber a])
303+ , switchSubscribedSelf :: {-# NOUNPACK #-} (Subscriber a)
304+ , switchSubscribedSelfWeak :: !(IORef (Weak (Subscriber a)))
305+ , switchSubscribedOwnInvalidator :: {-# NOUNPACK #-} Invalidator
306+ , switchSubscribedOwnWeakInvalidator :: !(IORef (Weak Invalidator))
307+ , switchSubscribedBehaviorParents :: !(IORef [SomeBehaviorSubscribed])
308+ , switchSubscribedParent :: !(Behavior (Event a))
309+ , switchSubscribedCurrentParent :: !(IORef (EventSubscribed a))
1151310#ifdef DEBUG_NODEIDS
1152311 , switchSubscribedNodeId :: Int
1153312#endif
1154313 }
1155314
1156−data Switch x a
1157− = Switch { switchParent :: !(Behavior x (Event x a))
1158− , switchSubscribed :: !(IORef (Maybe (SwitchSubscribed x a)))
315+data Switch a
316+ = Switch { switchParent :: !(Behavior (Event a))
317+ , switchSubscribed :: !(IORef (Maybe (SwitchSubscribed a)))
1159318 }
1160319
1161−#ifdef USE_TEMPLATE_HASKELL
1162−{-# ANN CoincidenceSubscribed "HLint: ignore Redundant bracket" #-}
1163−#endif
1164−data CoincidenceSubscribed x a
1165− = CoincidenceSubscribed { coincidenceSubscribedCachedSubscribed :: !(IORef (Maybe (CoincidenceSubscribed x a)))
1166− , coincidenceSubscribedOccurrence :: !(IORef (Maybe a))
1167− , coincidenceSubscribedSubscribers :: !(WeakBag (Subscriber x a))
1168− , coincidenceSubscribedHeight :: !(IORef Height)
1169− , coincidenceSubscribedOuter :: {-# NOUNPACK #-} (Subscriber x (Event x a))
1170− , coincidenceSubscribedOuterParent :: !(EventSubscription x)
1171− , coincidenceSubscribedInnerParent :: !(IORef (Maybe (EventSubscribed x)))
1172− , coincidenceSubscribedWeakSelf :: !(IORef (Weak (CoincidenceSubscribed x a)))
320+data CoincidenceSubscribed a
321+ = CoincidenceSubscribed { coincidenceSubscribedOccurrence :: !(IORef (Maybe a))
322+ , coincidenceSubscribedSubscribers :: !(IORef [WeakSubscriber a])
323+ , coincidenceSubscribedHeight :: !(IORef Int)
324+ , coincidenceSubscribedOuter :: {-# NOUNPACK #-} (Subscriber (Event a))
325+ , coincidenceSubscribedOuterParent :: !(EventSubscribed (Event a))
326+ , coincidenceSubscribedInnerParent :: !(IORef (Maybe (EventSubscribed a)))
1173327#ifdef DEBUG_NODEIDS
1174328 , coincidenceSubscribedNodeId :: Int
1175329#endif
1176330 }
1177331
1178−data Coincidence x a
1179− = Coincidence { coincidenceParent :: !(Event x (Event x a))
1180− , coincidenceSubscribed :: !(IORef (Maybe (CoincidenceSubscribed x a)))
332+data Coincidence a
333+ = Coincidence { coincidenceParent :: !(Event (Event a))
334+ , coincidenceSubscribed :: !(IORef (Maybe (CoincidenceSubscribed a)))
1181335 }
1182336
337+data Box a = Box { unBox :: a }
338+
339+--type WeakSubscriber a = Weak (Subscriber a)
340+data WeakSubscriber a
341+ = forall k. GCompare k => WeakSubscriberMerge !(k a) !(Weak (Box (MergeSubscribed k))) --TODO: Can we inline the GCompare?
342+ | WeakSubscriberSimple !(Weak (Subscriber a))
343+
344+showWeakSubscriberType :: WeakSubscriber a -> String
345+showWeakSubscriberType = \case
346+ WeakSubscriberMerge _ _ -> "WeakSubscriberMerge"
347+ WeakSubscriberSimple _ -> "WeakSubscriberSimple"
348+
349+deRefWeakSubscriber :: WeakSubscriber a -> IO (Maybe (Subscriber a))
350+deRefWeakSubscriber ws = case ws of
351+ WeakSubscriberSimple w -> deRefWeak w
352+ WeakSubscriberMerge k w -> liftM (fmap $ SubscriberMerge k . unBox) $ deRefWeak w
353+
354+data Subscriber a
355+ = forall b. SubscriberPush !(a -> EventM (Maybe b)) (PushSubscribed a b)
356+ | forall k. GCompare k => SubscriberMerge !(k a) (MergeSubscribed k) --TODO: Can we inline the GCompare?
357+ | forall k. (GCompare k, a ~ DMap k Identity) => SubscriberFan (FanSubscribed k)
358+ | SubscriberHold !(Hold a)
359+ | SubscriberSwitch (SwitchSubscribed a)
360+ | forall b. a ~ Event b => SubscriberCoincidenceOuter (CoincidenceSubscribed b)
361+ | SubscriberCoincidenceInner (CoincidenceSubscribed a)
362+
363+showSubscriberType :: Subscriber a -> String
364+showSubscriberType = \case
365+ SubscriberPush _ _ -> "SubscriberPush"
366+ SubscriberMerge _ _ -> "SubscriberMerge"
367+ SubscriberFan _ -> "SubscriberFan"
368+ SubscriberHold _ -> "SubscriberHold"
369+ SubscriberSwitch _ -> "SubscriberSwitch"
370+ SubscriberCoincidenceOuter _ -> "SubscriberCoincidenceOuter"
371+ SubscriberCoincidenceInner _ -> "SubscriberCoincidenceInner"
372+
373+data Event a
374+ = forall k. GCompare k => EventRoot !(k a) !(Root k)
375+ | EventNever
376+ | forall b. EventPush !(Push b a)
377+ | forall k. (GCompare k, a ~ DMap k Identity) => EventMerge !(Merge k)
378+ | forall k. GCompare k => EventFan !(k a) !(Fan k)
379+ | EventSwitch !(Switch a)
380+ | EventCoincidence !(Coincidence a)
381+
382+showEventType :: Event a -> String
383+showEventType = \case
384+ EventRoot _ _ -> "EventRoot"
385+ EventNever -> "EventNever"
386+ EventPush _ -> "EventPush"
387+ EventMerge _ -> "EventMerge"
388+ EventFan _ _ -> "EventFan"
389+ EventSwitch _ -> "EventSwitch"
390+ EventCoincidence _ -> "EventCoincidence"
391+
392+data EventSubscribed a
393+ = EventSubscribedRoot {-# NOUNPACK #-} (RootSubscribed a)
394+ | EventSubscribedNever
395+ | forall b. EventSubscribedPush !(PushSubscribed b a)
396+ | forall k. (GCompare k, a ~ DMap k Identity) => EventSubscribedMerge !(MergeSubscribed k)
397+ | forall k. GCompare k => EventSubscribedFan !(k a) !(FanSubscribed k)
398+ | EventSubscribedSwitch !(SwitchSubscribed a)
399+ | EventSubscribedCoincidence !(CoincidenceSubscribed a)
400+
401+-- These function are constructor functions that are marked NOINLINE so they are
402+-- opaque to GHC. If we do not do this, then GHC will sometimes fuse the constructor away
403+-- so any weak references that are attached to the constructors will have their
404+-- finalizer run. Using the opaque constructor, does not see the
405+-- constructor application, so it behaves like an IORef and cannot be fused away.
406+--
407+-- The result is also evaluated to WHNF, since forcing a thunk invalidates
408+-- the weak pointer to it in some cases.
409+
410+{-# NOINLINE newRootSubscribed #-}
411+newRootSubscribed :: IO (Maybe a) -> IORef [WeakSubscriber a] -> IO (RootSubscribed a)
412+newRootSubscribed occ subs =
413+ return $! RootSubscribed
414+ { rootSubscribedOccurrence = occ
415+ , rootSubscribedSubscribers = subs
416+ }
417+
418+{-# NOINLINE newSubscriberPush #-}
419+newSubscriberPush :: (a -> EventM (Maybe b)) -> PushSubscribed a b -> IO (Subscriber a)
420+newSubscriberPush compute subd = return $! SubscriberPush compute subd
421+
422+{-# NOINLINE newSubscriberHold #-}
423+newSubscriberHold :: Hold a -> IO (Subscriber a)
424+newSubscriberHold h = return $! SubscriberHold h
425+
426+{-# NOINLINE newSubscriberFan #-}
427+newSubscriberFan :: GCompare k => FanSubscribed k -> IO (Subscriber (DMap k Identity))
428+newSubscriberFan subd = return $! SubscriberFan subd
429+
430+{-# NOINLINE newSubscriberSwitch #-}
431+newSubscriberSwitch :: SwitchSubscribed a -> IO (Subscriber a)
432+newSubscriberSwitch subd = return $! SubscriberSwitch subd
433+
434+{-# NOINLINE newSubscriberCoincidenceOuter #-}
435+newSubscriberCoincidenceOuter :: CoincidenceSubscribed b -> IO (Subscriber (Event b))
436+newSubscriberCoincidenceOuter subd = return $! SubscriberCoincidenceOuter subd
437+
438+{-# NOINLINE newSubscriberCoincidenceInner #-}
439+newSubscriberCoincidenceInner :: CoincidenceSubscribed a -> IO (Subscriber a)
440+newSubscriberCoincidenceInner subd = return $! SubscriberCoincidenceInner subd
441+
1183442{-# NOINLINE newInvalidatorSwitch #-}
1184−newInvalidatorSwitch :: SwitchSubscribed x a -> IO (Invalidator x)
443+newInvalidatorSwitch :: SwitchSubscribed a -> IO Invalidator
1185444newInvalidatorSwitch subd = return $! InvalidatorSwitch subd
1186445
1187446{-# NOINLINE newInvalidatorPull #-}
1188−newInvalidatorPull :: Pull x a -> IO (Invalidator x)
447+newInvalidatorPull :: Pull a -> IO Invalidator
1189448newInvalidatorPull p = return $! InvalidatorPull p
1190449
1191−instance HasSpiderTimeline x => Filterable (Event x) where
1192− mapMaybe f = push $ return . f
1193−
1194−instance HasSpiderTimeline x => Align (Event x) where
1195− nil = eventNever
1196−#if MIN_VERSION_these(0, 8, 0)
1197−instance HasSpiderTimeline x => Semialign (Event x) where
1198−#endif
1199− align ea eb = mapMaybe dmapToThese $ mergeG coerce $ dynamicConst $
1200− DMap.fromDistinctAscList [LeftTag :=> ea, RightTag :=> eb]
1201−
1202−#ifdef MIN_VERSION_semialign
1203−#if MIN_VERSION_semialign(1,1,0)
1204−instance HasSpiderTimeline x => Zip (Event x) where
1205−#endif
1206− zip x y = mapMaybe justThese $ align x y
1207−#endif
450+{-# NOINLINE newBox #-}
451+newBox :: a -> IO (Box a)
452+newBox a = return $! Box a
1208453
1209−data DynType x p = UnsafeDyn !(BehaviorM x (PatchTarget p), Event x p)
1210− | BuildDyn !(EventM x (PatchTarget p), Event x p)
1211− | HoldDyn !(Hold x p)
1212−
1213−newtype Dyn (x :: Type) p = Dyn { unDyn :: IORef (DynType x p) }
1214−
1215−newMapDyn :: HasSpiderTimeline x => (a -> b) -> DynamicS x (Identity a) -> DynamicS x (Identity b)
1216−newMapDyn f d = dynamicDynIdentity $ unsafeBuildDynamic (fmap f $ readBehaviorTracked $ dynamicCurrent d) (Identity . f . runIdentity <$> dynamicUpdated d)
1217−
1218−--TODO: Avoid the duplication between this and R.zipDynWith
1219−zipDynWith :: HasSpiderTimeline x => (a -> b -> c) -> DynamicS x (Identity a) -> DynamicS x (Identity b) -> DynamicS x (Identity c)
1220−zipDynWith f da db =
1221− let eab = align (dynamicUpdated da) (dynamicUpdated db)
1222− ec = flip push eab $ \o -> do
1223− (a, b) <- case o of
1224− This (Identity a) -> do
1225− b <- readBehaviorUntracked $ dynamicCurrent db
1226− return (a, b)
1227− That (Identity b) -> do
1228− a <- readBehaviorUntracked $ dynamicCurrent da
1229− return (a, b)
1230− These (Identity a) (Identity b) -> return (a, b)
1231− return $ Just $ Identity $ f a b
1232− in dynamicDynIdentity $ unsafeBuildDynamic (f <$> readBehaviorUntracked (dynamicCurrent da) <*> readBehaviorUntracked (dynamicCurrent db)) ec
1233−
1234−buildDynamic :: (Defer (SomeDynInit x) m, Patch p) => EventM x (PatchTarget p) -> Event x p -> m (Dyn x p)
1235−buildDynamic readV0 v' = do
1236− result <- liftIO $ newIORef $ BuildDyn (readV0, v')
1237− let !d = Dyn result
1238− defer $ SomeDynInit d
1239− return d
1240−
1241−unsafeBuildDynamic :: BehaviorM x (PatchTarget p) -> Event x p -> Dyn x p
1242−unsafeBuildDynamic readV0 v' =
1243− Dyn $ unsafePerformIO $ newIORef $ UnsafeDyn (readV0, v')
454+--type role Behavior representational
455+data Behavior a
456+ = BehaviorHold !(Hold a)
457+ | BehaviorConst !a
458+ | BehaviorPull !(Pull a)
1244459
1245460-- ResultM can read behaviors and events
1246461type ResultM = EventM
1247462
1248−instance HasSpiderTimeline x => Functor (Event x) where
463+{-# NOINLINE unsafeNewIORef #-}
464+unsafeNewIORef :: a -> b -> IORef b
465+unsafeNewIORef _ b = unsafePerformIO $ newIORef b
466+
467+instance Functor Event where
1249468 fmap f = push $ return . Just . f
1250469
1251−instance Functor (Behavior x) where
1252− fmap f = pull . fmap f . readBehaviorTracked
470+instance Functor Behavior where
471+ fmap f = pull . liftM f . readBehaviorTracked
1253472
1254−{-# INLINE push #-}
1255−push :: HasSpiderTimeline x => (a -> ComputeM x (Maybe b)) -> Event x a -> Event x b
1256−push f e = cacheEvent (pushCheap f e)
473+{-# NOINLINE push #-} --TODO: If this is helpful, we can get rid of the unsafeNewIORef and use unsafePerformIO directly
474+push :: (a -> EventM (Maybe b)) -> Event a -> Event b
475+push f e = EventPush $ Push
476+ { pushCompute = f
477+ , pushParent = e
478+ , pushSubscribed = unsafeNewIORef (f, e) Nothing --TODO: Does the use of the tuple here create unnecessary overhead?
479+ }
480+{-# RULES "push/push" forall f g e. push f (push g e) = push (maybe (return Nothing) f <=< g) e #-}
1257481
1258−{-# INLINABLE pull #-}
1259−pull :: BehaviorM x a -> Behavior x a
1260−pull a = unsafePerformIO $ do
1261− ref <- newIORef Nothing
1262−#ifdef DEBUG_NODEIDS
1263− nid <- newNodeId
1264−#endif
1265− pure $ behaviorPull $ Pull
1266− { pullCompute = a
1267− , pullValue = ref
1268−#ifdef DEBUG_NODEIDS
1269− , pullNodeId = nid
1270−#endif
1271− }
482+{-# NOINLINE pull #-}
483+pull :: BehaviorM a -> Behavior a
484+pull a = BehaviorPull $ Pull
485+ { pullCompute = a
486+ , pullValue = unsafeNewIORef a Nothing
487+ }
488+{-# RULES "pull/pull" forall a. pull (readBehaviorTracked (pull a)) = pull a #-}
1272489
1273−{-# INLINABLE switch #-}
1274−switch :: HasSpiderTimeline x => Behavior x (Event x a) -> Event x a
1275−switch a = unsafePerformIO $ do
1276− ref <- newIORef Nothing
1277− pure $ eventSwitch $ Switch
1278− { switchParent = a
1279− , switchSubscribed = ref
1280− }
490+{-# NOINLINE switch #-}
491+switch :: Behavior (Event a) -> Event a
492+switch a = EventSwitch $ Switch
493+ { switchParent = a
494+ , switchSubscribed = unsafeNewIORef a Nothing
495+ }
496+{-# RULES "switch/constB" forall e. switch (BehaviorConst e) = e #-}
497+
498+coincidence :: Event (Event a) -> Event a
499+coincidence a = EventCoincidence $ Coincidence
500+ { coincidenceParent = a
501+ , coincidenceSubscribed = unsafeNewIORef a Nothing
502+ }
1281503
1282−coincidence :: HasSpiderTimeline x => Event x (Event x a) -> Event x a
1283−coincidence a = unsafePerformIO $ do
1284− ref <- newIORef Nothing
1285− pure $ eventCoincidence $ Coincidence
1286− { coincidenceParent = a
1287− , coincidenceSubscribed = ref
504+newRoot :: IO (Root k)
505+newRoot = do
506+ occRef <- newIORef DMap.empty
507+ subscribedRef <- newIORef DMap.empty
508+ return $ Root
509+ { rootOccurrence = occRef
510+ , rootSubscribed = subscribedRef
511+ , rootInit = \_ _ -> return $ return ()
1288512 }
1289513
514+propagateAndUpdateSubscribersRef :: IORef [WeakSubscriber a] -> a -> EventM ()
515+propagateAndUpdateSubscribersRef subscribersRef a = do
516+ subscribers <- liftIO $ readIORef subscribersRef
517+ liftIO $ writeIORef subscribersRef []
518+ stillAlive <- propagate a subscribers
519+ liftIO $ modifyIORef' subscribersRef (++stillAlive)
520+
1290521-- Propagate the given event occurrence; before cleaning up, run the given action, which may read the state of events and behaviors
1291−run :: forall x b. HasSpiderTimeline x => [DSum (RootTrigger x) Identity] -> ResultM x b -> SpiderHost x b
522+run :: [DSum RootTrigger Identity] -> ResultM b -> IO b
1292523run roots after = do
1293− tracePropagate (Proxy :: Proxy x) $ "Running an event frame with " <> show (length roots) <> " events"
1294− let t = spiderTimeline :: SpiderTimelineEnv x
1295− result <- SpiderHost $ withMVar (_spiderTimeline_lock (unSTE t)) $ \_ -> unSpiderHost $ runFrame $ do
524+ when debugPropagate $ putStrLn "Running an event frame"
525+ result <- runFrame $ do
1296526 rootsToPropagate <- forM roots $ \r@(RootTrigger (_, occRef, k) :=> a) -> do
1297527 occBefore <- liftIO $ do
1298528 occBefore <- readIORef occRef
1299− writeIORef occRef $! DMap.insert k a occBefore
529+ writeIORef occRef $ DMap.insert k a occBefore
1300530 return occBefore
1301531 if DMap.null occBefore
1302532 then do scheduleRootClear occRef
1303533 return $ Just r
1304534 else return Nothing
1305535 forM_ (catMaybes rootsToPropagate) $ \(RootTrigger (subscribersRef, _, _) :=> Identity a) -> do
1306− propagate a subscribersRef
1307− delayedRef <- asksEventEnv eventEnvDelayedMerges
536+ propagateAndUpdateSubscribersRef subscribersRef a
537+ delayedRef <- EventM $ asks eventEnvDelayedMerges
1308538 let go = do
1309539 delayed <- liftIO $ readIORef delayedRef
1310540 case IntMap.minViewWithKey delayed of
1311541 Nothing -> return ()
1312− Just ((currentHeight, cur), future) -> do
1313− tracePropagate (Proxy :: Proxy x) $ "Running height " ++ show currentHeight
1314− putCurrentHeight $ Height currentHeight
1315− liftIO $ writeIORef delayedRef $! future
1316− sequence_ cur
542+ Just ((currentHeight, current), future) -> do
543+ when debugPropagate $ liftIO $ putStrLn $ "Running height " ++ show currentHeight
544+ putCurrentHeight currentHeight
545+ liftIO $ writeIORef delayedRef future
546+ forM_ current $ \d -> case d of
547+ DelayedMerge subscribed -> do
548+ height <- liftIO $ readIORef $ mergeSubscribedHeight subscribed
549+ case height `compare` currentHeight of
550+ LT -> error "Somehow a merge's height has been decreased after it was scheduled"
551+ GT -> scheduleMerge height subscribed -- The height has been increased (by a coincidence event; TODO: is this the only way?)
552+ EQ -> do
553+ m <- liftIO $ readIORef $ mergeSubscribedAccum subscribed
554+ liftIO $ writeIORef (mergeSubscribedAccum subscribed) DMap.empty
555+ --TODO: Assert that m is not empty
556+ liftIO $ writeIORef (mergeSubscribedOccurrence subscribed) $ Just m
557+ scheduleClear $ mergeSubscribedOccurrence subscribed
558+ propagateAndUpdateSubscribersRef (mergeSubscribedSubscribers subscribed) m
1317559 go
1318560 go
1319561 putCurrentHeight maxBound
1320562 after
1321− tracePropagate (Proxy :: Proxy x) "Done running an event frame"
563+ when debugPropagate $ putStrLn "Done running an event frame"
1322564 return result
1323565
1324−scheduleMerge' :: HasSpiderTimeline x => Height -> IORef Height -> EventM x () -> EventM x ()
1325−scheduleMerge' initialHeight heightRef a = scheduleMerge initialHeight $ do
1326− height <- liftIO $ readIORef heightRef
1327− currentHeight <- getCurrentHeight
1328− case height `compare` currentHeight of
1329− LT -> error "Somehow a merge's height has been decreased after it was scheduled"
1330− GT -> scheduleMerge' height heightRef a -- The height has been increased (by a coincidence event; TODO: is this the only way?)
1331− EQ -> a
566+data SomeMaybeIORef = forall a. SomeMaybeIORef (IORef (Maybe a))
1332567
1333−newtype Clear a = Clear (IORef (Maybe a))
568+data SomeDMapIORef = forall k. SomeDMapIORef (IORef (DMap k Identity))
1334569
1335−newtype IntClear a = IntClear (IORef (IntMap a))
570+data SomeAssignment = forall a. SomeAssignment (Hold a) a
1336571
1337−newtype RootClear k = RootClear (IORef (DMap k Identity))
1338−
1339−data SomeAssignment x = forall a. SomeAssignment {-# UNPACK #-} !(IORef a) {-# UNPACK #-} !(IORef [Weak (Invalidator x)]) a
572+data DelayedMerge = forall k. DelayedMerge (MergeSubscribed k)
1340573
1341574debugFinalize :: Bool
1342575debugFinalize = False
1343576
1344577mkWeakPtrWithDebug :: a -> String -> IO (Weak a)
1345−mkWeakPtrWithDebug x debugNote = do
1346− x' <- evaluate x
1347− mkWeakPtr x' $
1348− if debugFinalize
1349− then Just $ debugStrLn $ "finalizing: " ++ debugNote
1350− else Nothing
578+mkWeakPtrWithDebug x debugNote = mkWeakPtr x $
579+ if debugFinalize
580+ then Just $ putStrLn $ "finalizing: " ++ debugNote
581+ else Nothing
1351582
1352583type WeakList a = [Weak a]
1353584
1354−type CanTrace x m = (HasSpiderTimeline x, MonadIO m)
1355−
1356−
1357−
1358−
1359−#ifdef DEBUG
1360−
1361−debugSubscriber :: forall x a. HasSpiderTimeline x => String -> Subscriber x a -> IO (Subscriber x a)
1362−debugSubscriber description = return . debugSubscriber' description
1363−
1364−debugSubscriber' :: forall x a. HasSpiderTimeline x => String -> Subscriber x a -> Subscriber x a
1365−debugSubscriber' description subscribed = Subscriber
1366− {
1367− subscriberPropagate = \m -> do
1368− tracePropagate (Proxy :: Proxy x) ("subscriberPropagate: " <> description)
1369− subscriberPropagate subscribed m
1370− , subscriberInvalidateHeight = \old -> do
1371− traceInvalidateHeight $ "invalidateSubscriberHeight: " <> description <> ", old = " <> show (unHeight old)
1372− subscriberInvalidateHeight subscribed old
1373− traceInvalidateHeight $ "invalidateSubscriberHeight: " <> description <> ", done"
1374− , subscriberRecalculateHeight = \new -> do
1375− traceInvalidateHeight $ "subscriberRecalculateHeight: " <> description <> ", new = " <> show (unHeight new)
1376− subscriberRecalculateHeight subscribed new
1377− traceInvalidateHeight $ "subscriberRecalculateHeight: " <> description <> ", done"
1378− }
1379−
1380−
1381−{-# INLINE withIncreasedDepth #-}
1382−withIncreasedDepth :: forall proxy x m a. CanTrace x m => proxy x -> m a -> m a
1383−withIncreasedDepth _ a = do
1384− liftIO $ modifyIORef' (_spiderTimeline_depth $ unSTE (spiderTimeline :: SpiderTimelineEnv x)) succ
1385− result <- a
1386− liftIO $ modifyIORef' (_spiderTimeline_depth $ unSTE (spiderTimeline :: SpiderTimelineEnv x)) pred
1387− return result
1388−
1389−{-# INLINE tracePropagate #-}
1390−tracePropagate :: (CanTrace x m) => proxy x -> String -> m ()
1391−tracePropagate p = when debugPropagate . trace p
1392−
1393−{-# INLINE traceInvalidate #-}
1394−traceInvalidate :: String -> IO ()
1395−traceInvalidate = when debugInvalidate . liftIO . debugStrLn
1396−
1397−{-# INLINE traceInvalidateHeight #-}
1398−traceInvalidateHeight :: String -> IO ()
1399−traceInvalidateHeight = when debugInvalidateHeight . liftIO . debugStrLn
1400−
1401−{-# INLINE trace #-}
1402−trace :: (CanTrace x m) => proxy x -> String -> m ()
1403−trace p message = traceM p $ return message
1404−
1405−{-# INLINE traceM #-}
1406−traceM :: forall x proxy m. (CanTrace x m) => proxy x -> m String -> m ()
1407−traceM _ getMessage = do
1408− message <- getMessage
1409− d <- liftIO $ readIORef $ _spiderTimeline_depth $ unSTE (spiderTimeline :: SpiderTimelineEnv x)
1410− liftIO $ debugStrLn $ replicate d ' ' <> message
1411−
1412−#else
1413−
1414−{-# INLINE withIncreasedDepth #-}
1415−withIncreasedDepth :: proxy x -> m a -> m a
1416−withIncreasedDepth _ = id
1417−
1418−{-# INLINE tracePropagate #-}
1419−tracePropagate :: (CanTrace x m) => proxy x -> String -> m ()
1420−tracePropagate _ _ = return ()
1421−
1422−{-# INLINE traceInvalidate #-}
1423−traceInvalidate :: String -> IO ()
1424−traceInvalidate _ = return ()
1425−
1426−{-# INLINE traceInvalidateHeight #-}
1427−traceInvalidateHeight :: String -> IO ()
1428−traceInvalidateHeight _ = return ()
1429−
1430−{-# INLINE debugSubscriber #-}
1431−debugSubscriber :: String -> Subscriber x a -> IO (Subscriber x a)
1432−debugSubscriber _ = return
1433−
1434−{-# INLINE debugSubscriber' #-}
1435−debugSubscriber' :: String -> Subscriber x a -> Subscriber x a
1436−debugSubscriber' _ = id
1437−
1438−
1439−
1440−{-# INLINE trace #-}
1441−trace :: (CanTrace x m) => proxy x -> String -> m ()
1442−trace _ _ = return ()
1443−
1444−{-# INLINE traceM #-}
1445−traceM :: (CanTrace x m) => proxy x -> m String -> m ()
1446−traceM _ _ = return ()
1447−
1448−#endif
1449−
1450−whoCreatedIORef :: IORef a -> IO [String]
1451−whoCreatedIORef (IORef a) = whoCreated $! a
1452−
1453−groupByHead :: Eq a => [NonEmpty a] -> [(a, NonEmpty [a])]
1454−groupByHead = \case
1455− [] -> []
1456− (x :| xs) : t -> case groupByHead t of
1457− [] -> [(x, xs :| [])]
1458− l@((y, yss) : t')
1459− | x == y -> (x, xs `NonEmpty.cons` yss) : t'
1460− | otherwise -> (x, xs :| []) : l
1461−
1462−listsToForest :: Eq a => [[a]] -> Forest a
1463−listsToForest lists = buildForest <$> groupByHead (mapMaybe nonEmpty lists)
1464− where buildForest (a, lists') = Node a $ listsToForest $ toList lists'
1465−
1466−showStacks :: [[String]] -> String
1467−showStacks = drawForest . listsToForest . fmap (filterStack "Reflex.Spider.Internal")
585+--TODO: Is it faster to clean up every time, or to occasionally go through and clean up as needed?
586+traverseAndCleanWeakList_ :: Monad m => (wa -> m (Maybe a)) -> [wa] -> (a -> m ()) -> m [wa]
587+traverseAndCleanWeakList_ deRef ws f = go ws
588+ where go [] = return []
589+ go (h:t) = do
590+ ma <- deRef h
591+ case ma of
592+ Just a -> do
593+ f a
594+ t' <- go t
595+ return $ h : t'
596+ Nothing -> go t
1468597
1469−filterStack :: String -> [String] -> [String]
1470−#ifdef DEBUG_HIDE_INTERNALS
1471−filterStack prefix = filter (not . (prefix `isPrefixOf`))
1472−#else
1473−filterStack prefix = id
1474−#endif
1475−
1476−#ifdef DEBUG_CYCLES
1477−
1478−data EventLoopException = EventLoopException [[String]]
1479−instance Exception EventLoopException
1480−
1481−instance Show EventLoopException where
1482− show (EventLoopException stacks) = "causality loop detected:\n" <> if null stacks
1483− then "no location information, compile with profiling enabled for stack tree"
1484− else showStacks stacks
598+-- | Propagate everything at the current height
599+propagate :: a -> [WeakSubscriber a] -> EventM [WeakSubscriber a]
600+propagate a subscribers = do
601+ traverseAndCleanWeakList_ (liftIO . deRefWeakSubscriber) subscribers $ \s -> case s of
602+ SubscriberPush compute subscribed -> do
603+ when debugPropagate $ liftIO $ putStrLn $ "SubscriberPush" <> showNodeId subscribed
604+ occ <- compute a
605+ case occ of
606+ Nothing -> return () -- No need to write a Nothing back into the Ref
607+ Just o -> do
608+ liftIO $ writeIORef (pushSubscribedOccurrence subscribed) occ
609+ scheduleClear $ pushSubscribedOccurrence subscribed
610+ liftIO . writeIORef (pushSubscribedSubscribers subscribed) =<< propagate o =<< liftIO (readIORef (pushSubscribedSubscribers subscribed))
611+ SubscriberMerge k subscribed -> do
612+ when debugPropagate $ liftIO $ putStrLn $ "SubscriberMerge" <> showNodeId subscribed
613+ oldM <- liftIO $ readIORef $ mergeSubscribedAccum subscribed
614+ liftIO $ writeIORef (mergeSubscribedAccum subscribed) $ DMap.insertWith (error "Same key fired multiple times for") k (Identity a) oldM
615+ when (DMap.null oldM) $ do -- Only schedule the firing once
616+ height <- liftIO $ readIORef $ mergeSubscribedHeight subscribed
617+ --TODO: assertions about height
618+ currentHeight <- getCurrentHeight
619+ when (height <= currentHeight) $ error $ "Height (" ++ show height ++ ") is not greater than current height (" ++ show currentHeight ++ ")"
620+ scheduleMerge height subscribed
621+ SubscriberFan subscribed -> do
622+ subs <- liftIO $ readIORef $ fanSubscribedSubscribers subscribed
623+ when debugPropagate $ liftIO $ putStrLn $ "SubscriberFan" <> showNodeId subscribed <> ": " ++ show (DMap.size subs) ++ " keys subscribed, " ++ show (DMap.size a) ++ " keys firing"
624+ --TODO: We need a better DMap intersection; here, we are assuming that the number of firing keys is small and the number of subscribers is large
625+ forM_ (DMap.toList a) $ \(k :=> Identity v) -> case DMap.lookup (FanSubscriberKey k) subs of
626+ Nothing -> do
627+ when debugPropagate $ liftIO $ putStrLn "No subscriber for key"
628+ return ()
629+ Just (Identity subsubs) -> do
630+ _ <- propagate v subsubs --TODO: use the value of this
631+ return ()
632+ --TODO: The following is way too slow to do all the time
633+ subs' <- liftIO $ forM (DMap.toList subs) $ ((\(FanSubscriberKey k :=> Identity subsubs) -> do
634+ subsubs' <- traverseAndCleanWeakList_ (liftIO . deRefWeakSubscriber) subsubs (const $ return ())
635+ return $ if null subsubs'
636+ then Nothing
637+ else Just $ FanSubscriberKey k :=> Identity subsubs') :: DSum (FanSubscriberKey k) Identity -> IO (Maybe (DSum (FanSubscriberKey k) Identity)))
638+ liftIO $ writeIORef (fanSubscribedSubscribers subscribed) $ DMap.fromDistinctAscList $ catMaybes subs'
639+ SubscriberHold h -> do
640+ invalidators <- liftIO $ readIORef $ holdInvalidators h
641+ when debugPropagate $ liftIO $ putStrLn $ "SubscriberHold" <> showNodeId h <> ": " ++ show (length invalidators)
642+ toAssignRef <- askToAssignRef
643+ liftIO $ modifyIORef' toAssignRef (SomeAssignment h a :)
644+ SubscriberSwitch subscribed -> do
645+ when debugPropagate $ liftIO $ putStrLn $ "SubscriberSwitch" <> showNodeId subscribed
646+ liftIO $ writeIORef (switchSubscribedOccurrence subscribed) $ Just a
647+ scheduleClear $ switchSubscribedOccurrence subscribed
648+ subs <- liftIO $ readIORef $ switchSubscribedSubscribers subscribed
649+ liftIO . writeIORef (switchSubscribedSubscribers subscribed) =<< propagate a subs
650+ SubscriberCoincidenceOuter subscribed -> do
651+ when debugPropagate $ liftIO $ putStrLn $ "SubscriberCoincidenceOuter" <> showNodeId subscribed
652+ outerHeight <- liftIO $ readIORef $ coincidenceSubscribedHeight subscribed
653+ when debugPropagate $ liftIO $ putStrLn $ " outerHeight = " <> show outerHeight
654+ (occ, innerHeight, innerSubd) <- subscribeCoincidenceInner a outerHeight subscribed
655+ when debugPropagate $ liftIO $ putStrLn $ " isJust occ = " <> show (isJust occ)
656+ when debugPropagate $ liftIO $ putStrLn $ " innerHeight = " <> show innerHeight
657+ liftIO $ writeIORef (coincidenceSubscribedInnerParent subscribed) $ Just innerSubd
658+ scheduleClear $ coincidenceSubscribedInnerParent subscribed
659+ case occ of
660+ Nothing -> do
661+ when (innerHeight > outerHeight) $ liftIO $ do -- If the event fires, it will fire at a later height
662+ writeIORef (coincidenceSubscribedHeight subscribed) innerHeight
663+ mapM_ invalidateSubscriberHeight =<< readIORef (coincidenceSubscribedSubscribers subscribed)
664+ mapM_ recalculateSubscriberHeight =<< readIORef (coincidenceSubscribedSubscribers subscribed)
665+ Just o -> do -- Since it's already firing, no need to adjust height
666+ liftIO $ writeIORef (coincidenceSubscribedOccurrence subscribed) occ
667+ scheduleClear $ coincidenceSubscribedOccurrence subscribed
668+ liftIO . writeIORef (coincidenceSubscribedSubscribers subscribed) =<< propagate o =<< liftIO (readIORef (coincidenceSubscribedSubscribers subscribed))
669+ SubscriberCoincidenceInner subscribed -> do
670+ when debugPropagate $ liftIO $ putStrLn $ "SubscriberCoincidenceInner" <> showNodeId subscribed
671+ liftIO $ writeIORef (coincidenceSubscribedOccurrence subscribed) $ Just a
672+ scheduleClear $ coincidenceSubscribedOccurrence subscribed
673+ liftIO . writeIORef (coincidenceSubscribedSubscribers subscribed) =<< propagate a =<< liftIO (readIORef (coincidenceSubscribedSubscribers subscribed))
1485674
1486−#else
675+data SomeCoincidenceInfo = forall a. SomeCoincidenceInfo (Weak (Subscriber a)) (Subscriber a) (Maybe (CoincidenceSubscribed a)) -- The CoincidenceSubscriber will be present only if heights need to be reset
1487676
1488−data EventLoopException = EventLoopException
1489−instance Exception EventLoopException
677+subscribeCoincidenceInner :: Event a -> Int -> CoincidenceSubscribed a -> EventM (Maybe a, Int, EventSubscribed a)
678+subscribeCoincidenceInner o outerHeight subscribedUnsafe = do
679+ subInner <- liftIO $ newSubscriberCoincidenceInner subscribedUnsafe
680+ wsubInner <- liftIO $ mkWeakPtrWithDebug subInner "SubscriberCoincidenceInner"
681+ innerSubd <- {-# SCC "innerSubd" #-} (subscribe o $ WeakSubscriberSimple wsubInner)
682+ innerOcc <- liftIO $ getEventSubscribedOcc innerSubd
683+ innerHeight <- liftIO $ readIORef $ eventSubscribedHeightRef innerSubd
684+ let height = max innerHeight outerHeight
685+ emitCoincidenceInfo $ SomeCoincidenceInfo wsubInner subInner $ if height > outerHeight then Just subscribedUnsafe else Nothing
686+ return (innerOcc, height, innerSubd)
1490687
1491−instance Show EventLoopException where
1492− show EventLoopException = "causality loop detected: \n" <>
1493− "compile reflex with flag 'debug-cycles' and compile with profiling enabled for stack tree"
688+readBehavior :: Behavior a -> IO a
689+readBehavior b = runBehaviorM (readBehaviorTracked b) Nothing --TODO: Specialize readBehaviorTracked to the Nothing and Just cases
1494690
1495−#endif
691+runBehaviorM :: BehaviorM a -> Maybe (Weak Invalidator, IORef [SomeBehaviorSubscribed]) -> IO a
692+runBehaviorM a mwi = runReaderT (unBehaviorM a) mwi
1496693
694+askInvalidator :: BehaviorM (Maybe (Weak Invalidator))
695+askInvalidator = liftM (fmap fst) $ BehaviorM ask
1497696
1498−{-# INLINE propagateSubscriberHold #-}
1499−propagateSubscriberHold :: forall x p. (HasSpiderTimeline x, Patch p) => Hold x p -> p -> EventM x ()
1500−propagateSubscriberHold h a = do
1501− {-# SCC "trace" #-} when debugPropagate $ traceM (Proxy :: Proxy x) $ liftIO $ do
1502− invalidators <- liftIO $ readIORef $ holdInvalidators h
1503− return $ "SubscriberHold" <> showNodeId h <> ": " ++ show (length invalidators)
697+askParentsRef :: BehaviorM (Maybe (IORef [SomeBehaviorSubscribed]))
698+askParentsRef = liftM (fmap snd) $ BehaviorM ask
1504699
1505− v <- {-# SCC "read" #-} liftIO $ readIORef $ holdValue h
1506− case {-# SCC "apply" #-} apply a v of
1507− Nothing -> return ()
1508− Just v' -> do
1509− {-# SCC "trace2" #-} withIncreasedDepth (Proxy :: Proxy x) $
1510− tracePropagate (Proxy :: Proxy x) ("propagateSubscriberHold: assigning Hold" <> showNodeId h)
1511− vRef <- {-# SCC "vRef" #-} liftIO $ evaluate $ holdValue h
1512− iRef <- {-# SCC "iRef" #-} liftIO $ evaluate $ holdInvalidators h
1513− defer $ {-# SCC "assignment" #-} SomeAssignment vRef iRef v'
1514−
1515−data SomeResetCoincidence x = forall a. SomeResetCoincidence !(EventSubscription x) !(Maybe (CoincidenceSubscribed x a)) -- The CoincidenceSubscriber will be present only if heights need to be reset
1516−
1517−runBehaviorM :: BehaviorM x a -> Maybe (Weak (Invalidator x), IORef [SomeBehaviorSubscribed x]) -> IORef [SomeHoldInit x] -> IO a
1518−runBehaviorM a mwi holdInits = runReaderIO (unBehaviorM a) (mwi, holdInits)
1519−
1520−askInvalidator :: BehaviorM x (Maybe (Weak (Invalidator x)))
1521−askInvalidator = do
1522− (!m, _) <- ask
1523− case m of
1524− Nothing -> return Nothing
1525− Just (!wi, _) -> return $ Just wi
1526−
1527−askParentsRef :: BehaviorM x (Maybe (IORef [SomeBehaviorSubscribed x]))
1528−askParentsRef = do
1529− (!m, _) <- ask
1530− case m of
1531− Nothing -> return Nothing
1532− Just (_, !p) -> return $ Just p
1533−
1534−askBehaviorHoldInits :: BehaviorM x (IORef [SomeHoldInit x])
1535−askBehaviorHoldInits = do
1536− (_, !his) <- ask
1537− return his
1538−
1539−{-# INLINE getDynHold #-}
1540−getDynHold :: (Defer (SomeHoldInit x) m, Patch p) => Dyn x p -> m (Hold x p)
1541−getDynHold d = do
1542− mh <- liftIO $ readIORef $ unDyn d
1543− case mh of
1544− HoldDyn h -> return h
1545− UnsafeDyn (readV0, v') -> do
1546− holdInits <- getDeferralQueue
1547− v0 <- liftIO $ runBehaviorM readV0 Nothing holdInits
1548− hold' v0 v'
1549− BuildDyn (readV0, v') -> do
1550− v0 <- liftIO $ runEventM readV0
1551− hold' v0 v'
1552− where
1553− hold' v0 v' = do
1554− h <- hold v0 v'
1555− liftIO $ writeIORef (unDyn d) $ HoldDyn h
1556− return h
700+readBehaviorTracked :: Behavior a -> BehaviorM a
701+readBehaviorTracked b = case b of
702+ BehaviorHold h -> do
703+ result <- liftIO $ readIORef $ holdValue h
704+ askInvalidator >>= mapM_ (\wi -> liftIO $ modifyIORef' (holdInvalidators h) (wi:))
705+ askParentsRef >>= mapM_ (\r -> liftIO $ modifyIORef' r (SomeBehaviorSubscribed (BehaviorSubscribedHold h) :))
706+ liftIO $ touch $ holdSubscriber h
707+ return result
708+ BehaviorConst a -> return a
709+ BehaviorPull p -> do
710+ val <- liftIO $ readIORef $ pullValue p
711+ case val of
712+ Just subscribed -> do
713+ askParentsRef >>= mapM_ (\r -> liftIO $ modifyIORef' r (SomeBehaviorSubscribed (BehaviorSubscribedPull subscribed) :))
714+ askInvalidator >>= mapM_ (\wi -> liftIO $ modifyIORef' (pullSubscribedInvalidators subscribed) (wi:))
715+ liftIO $ touch $ pullSubscribedOwnInvalidator subscribed
716+ return $ pullSubscribedValue subscribed
717+ Nothing -> do
718+ i <- liftIO $ newInvalidatorPull p
719+ wi <- liftIO $ mkWeakPtrWithDebug i "InvalidatorPull"
720+ parentsRef <- liftIO $ newIORef []
721+ a <- liftIO $ runReaderT (unBehaviorM $ pullCompute p) $ Just (wi, parentsRef)
722+ invsRef <- liftIO . newIORef . maybeToList =<< askInvalidator
723+ parents <- liftIO $ readIORef parentsRef
724+ let subscribed = PullSubscribed
725+ { pullSubscribedValue = a
726+ , pullSubscribedInvalidators = invsRef
727+ , pullSubscribedOwnInvalidator = i
728+ , pullSubscribedParents = parents
729+ }
730+ liftIO $ writeIORef (pullValue p) $ Just subscribed
731+ askParentsRef >>= mapM_ (\r -> liftIO $ modifyIORef' r (SomeBehaviorSubscribed (BehaviorSubscribedPull subscribed) :))
732+ return a
1557733
734+readEvent :: Event a -> ResultM (Maybe a)
735+readEvent e = case e of
736+ EventRoot k r -> liftIO . liftM (fmap runIdentity . DMap.lookup k) . readIORef $ rootOccurrence r
737+ EventNever -> return Nothing
738+ EventPush p -> do
739+ subscribed <- getPushSubscribed p
740+ liftIO $ do
741+ result <- readIORef $ pushSubscribedOccurrence subscribed -- Since ResultM is always called after the final height is reached, this will always be valid
742+ touch $ pushSubscribedSelf subscribed
743+ return result
744+ EventMerge m -> do
745+ subscribed <- getMergeSubscribed m
746+ liftIO $ do
747+ result <- readIORef $ mergeSubscribedOccurrence subscribed
748+ touch $ mergeSubscribedSelf subscribed
749+ return result
750+ EventFan k f -> do
751+ parentOcc <- readEvent $ fanParent f
752+ return . fmap runIdentity $ DMap.lookup k =<< parentOcc
753+ EventSwitch s -> do
754+ subscribed <- getSwitchSubscribed s
755+ liftIO $ do
756+ result <- readIORef $ switchSubscribedOccurrence subscribed
757+ touch $ switchSubscribedSelf subscribed
758+ touch $ switchSubscribedOwnInvalidator subscribed
759+ return result
760+ EventCoincidence c -> do
761+ subscribed <- getCoincidenceSubscribed c
762+ liftIO $ do
763+ result <- readIORef $ coincidenceSubscribedOccurrence subscribed
764+ touch $ coincidenceSubscribedOuter subscribed
765+ --TODO: do we need to touch the inner subscriber?
766+ return result
1558767
1559768-- Always refers to 0
1560769{-# NOINLINE zeroRef #-}
1561−zeroRef :: IORef Height
1562−zeroRef = unsafePerformIO $ newIORef zeroHeight
1563−
1564−getRootSubscribed :: forall k x a. (GCompare k, HasSpiderTimeline x) => k a -> Root x k -> Subscriber x a -> IO (WeakBagTicket, RootSubscribed x a, Maybe a)
1565−getRootSubscribed k r sub = do
1566− mSubscribed <- readIORef $ rootSubscribed r
1567− let getOcc = fmap (coerce . DMap.lookup k) $ readIORef $ rootOccurrence r
770+zeroRef :: IORef Int
771+zeroRef = unsafePerformIO $ newIORef 0
772+
773+getEventSubscribed :: Event a -> EventM (EventSubscribed a)
774+getEventSubscribed e = case e of
775+ EventRoot k r -> liftM EventSubscribedRoot $ getRootSubscribed k r
776+ EventNever -> return EventSubscribedNever
777+ EventPush p -> liftM EventSubscribedPush $ getPushSubscribed p
778+ EventFan k f -> liftM (EventSubscribedFan k) $ getFanSubscribed f
779+ EventMerge m -> liftM EventSubscribedMerge $ getMergeSubscribed m
780+ EventSwitch s -> liftM EventSubscribedSwitch $ getSwitchSubscribed s
781+ EventCoincidence c -> liftM EventSubscribedCoincidence $ getCoincidenceSubscribed c
782+
783+debugSubscribe :: Bool
784+debugSubscribe = False
785+
786+subscribeEventSubscribed :: EventSubscribed a -> WeakSubscriber a -> IO ()
787+subscribeEventSubscribed es ws = case es of
788+ EventSubscribedRoot r -> do
789+ when debugSubscribe $ liftIO $ putStrLn $ "subscribeEventSubscribed Root"
790+ modifyIORef' (rootSubscribedSubscribers r) (ws:)
791+ EventSubscribedNever -> do
792+ when debugSubscribe $ liftIO $ putStrLn $ "subscribeEventSubscribed Never"
793+ return ()
794+ EventSubscribedPush subscribed -> do
795+ when debugSubscribe $ liftIO $ putStrLn $ "subscribeEventSubscribed Push"
796+ modifyIORef' (pushSubscribedSubscribers subscribed) (ws:)
797+ EventSubscribedFan k subscribed -> do
798+ when debugSubscribe $ liftIO $ putStrLn $ "subscribeEventSubscribed Fan"
799+ modifyIORef' (fanSubscribedSubscribers subscribed) $ DMap.insertWith (liftA2 (++)) (FanSubscriberKey k) (Identity [ws])
800+ EventSubscribedMerge subscribed -> do
801+ when debugSubscribe $ liftIO $ putStrLn $ "subscribeEventSubscribed Merge"
802+ modifyIORef' (mergeSubscribedSubscribers subscribed) (ws:)
803+ EventSubscribedSwitch subscribed -> do
804+ when debugSubscribe $ liftIO $ putStrLn $ "subscribeEventSubscribed Switch"
805+ modifyIORef' (switchSubscribedSubscribers subscribed) (ws:)
806+ EventSubscribedCoincidence subscribed -> do
807+ when debugSubscribe $ liftIO $ putStrLn $ "subscribeEventSubscribed Coincidence"
808+ modifyIORef' (coincidenceSubscribedSubscribers subscribed) (ws:)
809+
810+getEventSubscribedOcc :: EventSubscribed a -> IO (Maybe a)
811+getEventSubscribedOcc es = case es of
812+ EventSubscribedRoot r -> rootSubscribedOccurrence r
813+ EventSubscribedNever -> return Nothing
814+ EventSubscribedPush subscribed -> readIORef $ pushSubscribedOccurrence subscribed
815+ EventSubscribedFan k subscribed -> do
816+ parentOcc <- getEventSubscribedOcc $ fanSubscribedParent subscribed
817+ let occ = fmap runIdentity $ DMap.lookup k =<< parentOcc
818+ return occ
819+ EventSubscribedMerge subscribed -> readIORef $ mergeSubscribedOccurrence subscribed
820+ EventSubscribedSwitch subscribed -> readIORef $ switchSubscribedOccurrence subscribed
821+ EventSubscribedCoincidence subscribed -> readIORef $ coincidenceSubscribedOccurrence subscribed
822+
823+eventSubscribedHeightRef :: EventSubscribed a -> IORef Int
824+eventSubscribedHeightRef es = case es of
825+ EventSubscribedRoot _ -> zeroRef
826+ EventSubscribedNever -> zeroRef
827+ EventSubscribedPush subscribed -> pushSubscribedHeight subscribed
828+ EventSubscribedFan _ subscribed -> eventSubscribedHeightRef $ fanSubscribedParent subscribed
829+ EventSubscribedMerge subscribed -> mergeSubscribedHeight subscribed
830+ EventSubscribedSwitch subscribed -> switchSubscribedHeight subscribed
831+ EventSubscribedCoincidence subscribed -> coincidenceSubscribedHeight subscribed
832+
833+subscribe :: Event a -> WeakSubscriber a -> EventM (EventSubscribed a)
834+subscribe e ws = do
835+ subd <- getEventSubscribed e
836+ liftIO $ subscribeEventSubscribed subd ws
837+ return subd
838+
839+noinlineFalse :: Bool
840+noinlineFalse = False
841+{-# NOINLINE noinlineFalse #-}
842+
843+getRootSubscribed :: GCompare k => k a -> Root k -> EventM (RootSubscribed a)
844+getRootSubscribed k r = do
845+ mSubscribed <- liftIO $ readIORef $ rootSubscribed r
1568846 case DMap.lookup k mSubscribed of
1569− Just subscribed -> {-# SCC "hitRoot" #-} do
1570− sln <- subscribeRootSubscribed subscribed sub
1571− occ <- getOcc
1572− return (sln, subscribed, occ)
1573− Nothing -> {-# SCC "missRoot" #-} do
1574− weakSelf <- newIORef $ error "getRootSubscribed: weakSelfRef not initialized"
1575− let !cached = rootSubscribed r
1576− uninitRef <- newIORef $ error "getRootsubscribed: uninitRef not initialized"
1577− (subs, sln) <- WeakBag.singleton sub weakSelf cleanupRootSubscribed
1578−
1579− tracePropagate (Proxy::Proxy x) $ "getRootSubscribed: calling rootInit"
1580−
1581− uninit <- rootInit r k $ RootTrigger (subs, rootOccurrence r, k)
1582− writeIORef uninitRef $! uninit
1583−#ifdef DEBUG_NODEIDS
1584− nid <- newNodeId
1585−#endif
1586− let !subscribed = RootSubscribed
1587− { rootSubscribedKey = k
1588− , rootSubscribedCachedSubscribed = cached
1589− , rootSubscribedOccurrence = getOcc
1590− , rootSubscribedSubscribers = subs
1591− , rootSubscribedUninit = uninit
1592− , rootSubscribedWeakSelf = weakSelf
847+ Just subscribed -> return subscribed
848+ Nothing -> liftIO $ do
849+ subscribersRef <- newIORef []
850+ subscribed <- newRootSubscribed (liftM (fmap runIdentity . DMap.lookup k) $ readIORef $ rootOccurrence r) subscribersRef
851+ -- Strangely, init needs the same stuff as a RootSubscribed has, but it must not be the same as the one that everyone's subscribing to, or it'll leak memory
852+ uninit <- rootInit r k $ RootTrigger (subscribersRef, rootOccurrence r, k)
853+ addFinalizer subscribed $ do
854+ when noinlineFalse $ putStr "" -- For some reason, without this line, the finalizer will run earlier than it should
855+-- putStrLn "Uninit root"
856+ uninit
857+ liftIO $ modifyIORef' (rootSubscribed r) $ DMap.insert k subscribed
858+ return subscribed
859+
860+-- When getPushSubscribed returns, the PushSubscribed returned will have a fully filled-in
861+getPushSubscribed :: Push a b -> EventM (PushSubscribed a b)
862+getPushSubscribed p = do
863+ mSubscribed <- liftIO $ readIORef $ pushSubscribed p
864+ case mSubscribed of
865+ Just subscribed -> return subscribed
866+ Nothing -> do -- Not yet subscribed
867+ subscribedUnsafe <- liftIO $ unsafeInterleaveIO $ liftM fromJust $ readIORef $ pushSubscribed p
868+ s <- liftIO $ newSubscriberPush (pushCompute p) subscribedUnsafe
869+ ws <- liftIO $ mkWeakPtrWithDebug s "SubscriberPush"
870+ subd <- subscribe (pushParent p) $ WeakSubscriberSimple ws
871+ parentOcc <- liftIO $ getEventSubscribedOcc subd
872+ occ <- liftM join $ mapM (pushCompute p) parentOcc
873+ occRef <- liftIO $ newIORef occ
874+ when (isJust occ) $ scheduleClear occRef
875+ subscribersRef <- liftIO $ newIORef []
876+ let subscribed = PushSubscribed
877+ { pushSubscribedOccurrence = occRef
878+ , pushSubscribedHeight = eventSubscribedHeightRef subd -- Since pushes have the same height as their parents, share the ref
879+ , pushSubscribedSubscribers = subscribersRef
880+ , pushSubscribedSelf = unsafeCoerce s
881+ , pushSubscribedParent = subd
1593882#ifdef DEBUG_NODEIDS
1594− , rootSubscribedNodeId = nid
883+ , pushSubscribedNodeId = unsafeNodeId p
1595884#endif
1596885 }
1597− -- If we die at the same moment that all our children die, they will
1598− -- try to clean us up but will fail because their Weak reference to us
1599− -- will also be dead. So, if we are dying, check if there are any
1600− -- children; since children don't bother cleaning themselves up if
1601− -- their parents are already dead, I don't think there's a race
1602− -- condition here. However, if there are any children, then we can
1603− -- infer that we need to clean ourselves up, so we do.
1604− finalCleanup = do
1605− cs <- readIORef $ _weakBag_children subs
1606− when (not $ IntMap.null cs) (cleanupRootSubscribed subscribed)
1607− writeIORef weakSelf =<< evaluate =<< mkWeakPtr subscribed (Just finalCleanup)
1608− modifyIORef' (rootSubscribed r) $ DMap.insertWith (error $ "getRootSubscribed: duplicate key inserted into Root") k subscribed --TODO: I think we can just write back mSubscribed rather than re-reading it
1609− occ <- getOcc
1610− return (sln, subscribed, occ)
1611−
1612−#ifdef USE_TEMPLATE_HASKELL
1613−{-# ANN cleanupRootSubscribed "HLint: ignore Redundant bracket" #-}
1614−#endif
1615−cleanupRootSubscribed :: RootSubscribed x a -> IO ()
1616−cleanupRootSubscribed self@RootSubscribed { rootSubscribedKey = k, rootSubscribedCachedSubscribed = cached } = do
1617− rootSubscribedUninit self
1618− modifyIORef' cached $ DMap.delete k
1619−
1620−{-# INLINE subscribeRootSubscribed #-}
1621−subscribeRootSubscribed :: RootSubscribed x a -> Subscriber x a -> IO WeakBagTicket
1622−subscribeRootSubscribed subscribed sub = WeakBag.insert sub (rootSubscribedSubscribers subscribed) (rootSubscribedWeakSelf subscribed) cleanupRootSubscribed
1623−
1624−newtype EventSelectorInt x a = EventSelectorInt { selectInt :: Int -> Event x a }
1625−
1626−data FanInt x a = FanInt
1627− { _fanInt_subscribers :: {-# UNPACK #-} !(FastMutableIntMap (FastWeakBag (Subscriber x a))) --TODO: Clean up the keys in here when their child weak bags get empty --TODO: Remove our own subscription when the subscribers list is completely empty
1628− , _fanInt_subscriptionRef :: {-# UNPACK #-} !(IORef (EventSubscription x)) -- This should have a valid subscription iff subscribers is non-empty
1629− , _fanInt_occRef :: {-# UNPACK #-} !(IORef (IntMap a))
1630−#ifdef DEBUG_NODEIDS
1631− , _fanInt_nodeId :: {-# UNPACK #-} !Int
1632−#endif
1633− }
886+ liftIO $ writeIORef (pushSubscribed p) $ Just subscribed
887+ return subscribed
1634888
1635−newFanInt :: IO (FanInt x a)
1636−newFanInt = do
1637− subscribers <- FastMutableIntMap.newEmpty --TODO: Clean up the keys in here when their child weak bags get empty --TODO: Remove our own subscription when the subscribers list is completely empty
1638− subscriptionRef <- newIORef $ error "fanInt: no subscription"
1639− occRef <- newIORef $ error "fanInt: no occurrence"
889+getMergeSubscribed :: forall k. GCompare k => Merge k -> EventM (MergeSubscribed k)
890+getMergeSubscribed m = {-# SCC "getMergeSubscribed.entire" #-} do
891+ mSubscribed <- liftIO $ readIORef $ mergeSubscribed m
892+ case mSubscribed of
893+ Just subscribed -> return subscribed
894+ Nothing -> if DMap.null $ mergeParents m then emptyMergeSubscribed else do
895+ subscribedRef <- liftIO $ newIORef $ error "getMergeSubscribed: subscribedRef not yet initialized"
896+ subscribedUnsafe <- liftIO $ unsafeInterleaveIO $ readIORef subscribedRef
897+ s <- liftIO $ newBox subscribedUnsafe
898+ ws <- liftIO $ mkWeakPtrWithDebug s "SubscriberMerge"
899+ subscribers :: [(Any, Maybe (DSum k Identity), Int, DSum k EventSubscribed)] <- forM (DMap.toList $ mergeParents m) $ {-# SCC "getMergeSubscribed.a" #-} \(k :=> e) -> {-# SCC "getMergeSubscribed.a1" #-} do
900+ parentSubd <- {-# SCC "getMergeSubscribed.a.parentSubd" #-} subscribe e $ WeakSubscriberMerge k ws
901+ parentOcc <- {-# SCC "getMergeSubscribed.a.parentOcc" #-} liftIO $ getEventSubscribedOcc parentSubd
902+ height <- {-# SCC "getMergeSubscribed.a.height" #-} liftIO $ readIORef $ eventSubscribedHeightRef parentSubd
903+ return $ {-# SCC "getMergeSubscribed.a.returnVal" #-} (unsafeCoerce s :: Any, fmap ((k :=>) . Identity) parentOcc, height, k :=> parentSubd)
904+ let dm = DMap.fromDistinctAscList $ catMaybes $ map (\(_, x, _, _) -> x) subscribers
905+ subscriberHeights = map (\(_, _, x, _) -> x) subscribers
906+ myHeight =
907+ if any (==invalidHeight) subscriberHeights --TODO: Replace 'any' with invalidHeight-preserving 'maximum'
908+ then invalidHeight
909+ else succ $ Prelude.maximum subscriberHeights -- This is safe because the DMap will never be empty here
910+ currentHeight <- getCurrentHeight
911+ let (occ, accum) = if currentHeight >= myHeight -- If we should have fired by now
912+ then (if DMap.null dm then Nothing else Just dm, DMap.empty)
913+ else (Nothing, dm)
914+ when (not $ DMap.null accum) $ do
915+ scheduleMerge myHeight subscribedUnsafe
916+ occRef <- liftIO $ newIORef occ
917+ when (isJust occ) $ scheduleClear occRef
918+ accumRef <- liftIO $ newIORef accum
919+ heightRef <- liftIO $ newIORef myHeight
920+ subsRef <- liftIO $ newIORef []
921+ let subscribed = MergeSubscribed
922+ { mergeSubscribedOccurrence = occRef
923+ , mergeSubscribedAccum = accumRef
924+ , mergeSubscribedHeight = heightRef
925+ , mergeSubscribedSubscribers = subsRef
926+ , mergeSubscribedSelf = unsafeCoerce $ map (\(x, _, _, _) -> x) subscribers --TODO: Does lack of strictness make this leak?
927+ , mergeSubscribedParents = DMap.fromDistinctAscList $ map (\(_, _, _, x) -> x) subscribers
1640928#ifdef DEBUG_NODEIDS
1641− nodeId <- newNodeId
929+ , mergeSubscribedNodeId = unsafeNodeId m
1642930#endif
1643− return $ FanInt
1644− { _fanInt_subscribers = subscribers
1645− , _fanInt_subscriptionRef = subscriptionRef
1646− , _fanInt_occRef = occRef
931+ }
932+ liftIO $ writeIORef subscribedRef subscribed
933+ return subscribed
934+ where emptyMergeSubscribed = do --TODO: This should never happen
935+ occRef <- liftIO $ newIORef Nothing
936+ accumRef <- liftIO $ newIORef DMap.empty
937+ subsRef <- liftIO $ newIORef []
938+ return $ MergeSubscribed
939+ { mergeSubscribedOccurrence = occRef
940+ , mergeSubscribedAccum = accumRef
941+ , mergeSubscribedHeight = zeroRef
942+ , mergeSubscribedSubscribers = subsRef --TODO: This will definitely leak
943+ , mergeSubscribedSelf = unsafeCoerce ()
944+ , mergeSubscribedParents = DMap.empty
1647945#ifdef DEBUG_NODEIDS
1648− , _fanInt_nodeId = nodeId
1649−#endif
1650− }
1651−
1652−fanInt :: HasSpiderTimeline x => Event x (IntMap a) -> EventSelectorInt x a
1653−fanInt p = unsafePerformIO $ do
1654− self <- newFanInt
1655− pure $ EventSelectorInt $ \k -> Event $ \sub -> do
1656− isEmpty <- liftIO $ FastMutableIntMap.isEmpty (_fanInt_subscribers self)
1657− when isEmpty $ do -- This is the first subscriber, so we need to subscribe to our input
1658− let desc = "fanInt" <> showNodeId self <> ", k = " <> show k
1659− (subscription, parentOcc) <- subscribeAndRead p $ debugSubscriber' desc $ Subscriber
1660− { subscriberPropagate = \m -> do
1661− liftIO $ writeIORef (_fanInt_occRef self) m
1662− scheduleIntClear $ _fanInt_occRef self
1663− FastMutableIntMap.forIntersectionWithImmutable_ (_fanInt_subscribers self) m $ \b v -> --TODO: Do we need to know that no subscribers are being added as we traverse?
1664− FastWeakBag.traverse_ b $ \s ->
1665− subscriberPropagate s v
1666− , subscriberInvalidateHeight = \old ->
1667− FastMutableIntMap.for_ (_fanInt_subscribers self) $ \b ->
1668− FastWeakBag.traverse_ b $ \s ->
1669− subscriberInvalidateHeight s old
1670− , subscriberRecalculateHeight = \new ->
1671− FastMutableIntMap.for_ (_fanInt_subscribers self) $ \b ->
1672− FastWeakBag.traverse_ b $ \s ->
1673− subscriberRecalculateHeight s new
1674− }
1675− liftIO $ do
1676− writeIORef (_fanInt_subscriptionRef self) subscription
1677− writeIORef (_fanInt_occRef self) $ fromMaybe IntMap.empty parentOcc
1678− scheduleIntClear $ _fanInt_occRef self
1679− liftIO $ do
1680− b <- FastMutableIntMap.lookup (_fanInt_subscribers self) k >>= \case
1681− Nothing -> do
1682− b <- FastWeakBag.empty
1683− FastMutableIntMap.insert (_fanInt_subscribers self) k b
1684− return b
1685− Just b -> return b
1686− ticket <- liftIO $ FastWeakBag.insert sub b
1687− currentOcc <- readIORef (_fanInt_occRef self)
1688−
1689− subscribed <- fanIntSubscribed ticket self
1690− return (EventSubscription (FastWeakBag.remove ticket) subscribed, IntMap.lookup k currentOcc)
1691−
1692−fanIntSubscribed :: FastWeakBagTicket k -> FanInt x a -> IO (EventSubscribed x)
1693−fanIntSubscribed ticket self = do
1694− subscribedParent <- _eventSubscription_subscribed <$> readIORef (_fanInt_subscriptionRef self)
1695− return $ EventSubscribed
1696− { eventSubscribedHeightRef = eventSubscribedHeightRef subscribedParent
1697− , eventSubscribedRetained = toAny (_fanInt_subscriptionRef self, ticket)
1698−#ifdef DEBUG_CYCLES
1699− , eventSubscribedGetParents = return [subscribedParent]
1700− , eventSubscribedHasOwnHeightRef = False
1701− , eventSubscribedWhoCreated = whoCreatedIORef $ _fanInt_subscriptionRef self
946+ , mergeSubscribedNodeId = -1
1702947#endif
1703− }
1704−
948+ }
1705949
1706−{-# INLINABLE getFanSubscribed #-}
1707−getFanSubscribed :: (HasSpiderTimeline x, GCompare k) => k a -> Fan x k v -> Subscriber x (v a) -> EventM x (WeakBagTicket, FanSubscribed x k v, Maybe (v a))
1708−getFanSubscribed k f sub = do
950+getFanSubscribed :: GCompare k => Fan k -> EventM (FanSubscribed k)
951+getFanSubscribed f = do
1709952 mSubscribed <- liftIO $ readIORef $ fanSubscribed f
1710953 case mSubscribed of
1711− Just subscribed -> {-# SCC "hitFan" #-} liftIO $ do
1712− sln <- subscribeFanSubscribed k subscribed sub
1713− occ <- readIORef $ fanSubscribedOccurrence subscribed
1714− return (sln, subscribed, coerce $ DMap.lookup k =<< occ)
1715− Nothing -> {-# SCC "missFan" #-} do
1716− subscribedRef <- liftIO $ newIORef $ error "getFanSubscribed: subscribedRef not yet initialized"
1717− subscribedUnsafe <- liftIO $ unsafeInterleaveIO $ readIORef subscribedRef
1718− s <- liftIO $ newSubscriberFan subscribedUnsafe
1719− (subscription, parentOcc) <- subscribeAndRead (fanParent f) s
1720− weakSelf <- liftIO $ newIORef $ error "getFanSubscribed: weakSelf not yet initialized"
1721− (subsForK, slnForSub) <- liftIO $ WeakBag.singleton sub weakSelf cleanupFanSubscribed
1722− subscribersRef <- liftIO $ newIORef $ error "getFanSubscribed: subscribersRef not yet initialized"
1723− occRef <- liftIO $ newIORef parentOcc
1724− when (isJust parentOcc) $ scheduleClear occRef
1725−#ifdef DEBUG_NODEIDS
1726− nid <- liftIO newNodeId
1727−#endif
954+ Just subscribed -> return subscribed
955+ Nothing -> do
956+ subscribedUnsafe <- liftIO $ unsafeInterleaveIO $ liftM fromJust $ readIORef $ fanSubscribed f
957+ sub <- liftIO $ newSubscriberFan subscribedUnsafe
958+ wsub <- liftIO $ mkWeakPtrWithDebug sub "SubscriberFan"
959+ subd <- subscribe (fanParent f) $ WeakSubscriberSimple wsub
960+ subscribersRef <- liftIO $ newIORef DMap.empty
1728961 let subscribed = FanSubscribed
1729− { fanSubscribedCachedSubscribed = fanSubscribed f
1730− , fanSubscribedOccurrence = occRef
1731− , fanSubscribedParent = subscription
962+ { fanSubscribedParent = subd
1732963 , fanSubscribedSubscribers = subscribersRef
964+ , fanSubscribedSelf = sub
1733965#ifdef DEBUG_NODEIDS
1734− , fanSubscribedNodeId = nid
966+ , fanSubscribedNodeId = unsafeNodeId f
1735967#endif
1736968 }
1737− let !self = (k, subscribed)
1738− liftIO $ writeIORef subscribersRef $! DMap.singleton k $ FanSubscribedChildren subsForK self weakSelf
1739− liftIO $ writeIORef weakSelf =<< evaluate =<< mkWeakPtrWithDebug self "FanSubscribed"
1740− liftIO $ writeIORef subscribedRef $! subscribed
1741969 liftIO $ writeIORef (fanSubscribed f) $ Just subscribed
1742− return (slnForSub, subscribed, coerce $ DMap.lookup k =<< parentOcc)
1743−
1744−cleanupFanSubscribed :: GCompare k => (k a, FanSubscribed x k v) -> IO ()
1745−cleanupFanSubscribed (k, subscribed) = do
1746− subscribers <- readIORef $ fanSubscribedSubscribers subscribed
1747− let reducedSubscribers = DMap.delete k subscribers
1748− if DMap.null reducedSubscribers
1749− then do
1750− unsubscribe $ fanSubscribedParent subscribed
1751− -- Not necessary in this case, because this whole FanSubscribed is dead: writeIORef (fanSubscribedSubscribers subscribed) reducedSubscribers
1752− writeIORef (fanSubscribedCachedSubscribed subscribed) Nothing
1753− else writeIORef (fanSubscribedSubscribers subscribed) $! reducedSubscribers
1754−
1755−{-# INLINE subscribeFanSubscribed #-}
1756−subscribeFanSubscribed :: GCompare k => k a -> FanSubscribed x k v -> Subscriber x (v a) -> IO WeakBagTicket
1757−subscribeFanSubscribed k subscribed sub = do
1758− subscribers <- readIORef $ fanSubscribedSubscribers subscribed
1759− case DMap.lookup k subscribers of
1760− Nothing -> {-# SCC "missSubscribeFanSubscribed" #-} do
1761− let !self = (k, subscribed)
1762− weakSelf <- newIORef =<< mkWeakPtrWithDebug self "FanSubscribed"
1763− (list, sln) <- WeakBag.singleton sub weakSelf cleanupFanSubscribed
1764− writeIORef (fanSubscribedSubscribers subscribed) $! DMap.insertWith (error "subscribeFanSubscribed: key that we just failed to find is present - should be impossible") k (FanSubscribedChildren list self weakSelf) subscribers
1765− return sln
1766− Just (FanSubscribedChildren list _ weakSelf) -> {-# SCC "hitSubscribeFanSubscribed" #-} WeakBag.insert sub list weakSelf cleanupFanSubscribed
1767−
1768−{-# INLINABLE getSwitchSubscribed #-}
1769−getSwitchSubscribed :: HasSpiderTimeline x => Switch x a -> Subscriber x a -> EventM x (WeakBagTicket, SwitchSubscribed x a, Maybe a)
1770−getSwitchSubscribed s sub = do
970+ return subscribed
971+
972+getSwitchSubscribed :: Switch a -> EventM (SwitchSubscribed a)
973+getSwitchSubscribed s = do
1771974 mSubscribed <- liftIO $ readIORef $ switchSubscribed s
1772975 case mSubscribed of
1773− Just subscribed -> {-# SCC "hitSwitch" #-} liftIO $ do
1774− sln <- subscribeSwitchSubscribed subscribed sub
1775− occ <- readIORef $ switchSubscribedOccurrence subscribed
1776− return (sln, subscribed, occ)
1777− Nothing -> {-# SCC "missSwitch" #-} do
976+ Just subscribed -> return subscribed
977+ Nothing -> do
1778978 subscribedRef <- liftIO $ newIORef $ error "getSwitchSubscribed: subscribed has not yet been created"
1779979 subscribedUnsafe <- liftIO $ unsafeInterleaveIO $ readIORef subscribedRef
1780980 i <- liftIO $ newInvalidatorSwitch subscribedUnsafe
1781− mySub <- liftIO $ newSubscriberSwitch subscribedUnsafe
981+ sub <- liftIO $ newSubscriberSwitch subscribedUnsafe
1782982 wi <- liftIO $ mkWeakPtrWithDebug i "InvalidatorSwitch"
1783983 wiRef <- liftIO $ newIORef wi
984+ wsub <- liftIO $ mkWeakPtrWithDebug sub "SubscriberSwitch"
985+ selfWeakRef <- liftIO $ newIORef wsub
1784986 parentsRef <- liftIO $ newIORef [] --TODO: This should be unnecessary, because it will always be filled with just the single parent behavior
1785− holdInits <- getDeferralQueue
1786− e <- liftIO $ runBehaviorM (readBehaviorTracked (switchParent s)) (Just (wi, parentsRef)) holdInits
1787− (subscription@(EventSubscription _ subd), parentOcc) <- subscribeAndRead e mySub
1788− heightRef <- liftIO $ newIORef =<< getEventSubscribedHeight subd
1789− subscriptionRef <- liftIO $ newIORef subscription
987+ e <- liftIO $ runBehaviorM (readBehaviorTracked (switchParent s)) $ Just (wi, parentsRef)
988+ subd <- subscribe e $ WeakSubscriberSimple wsub
989+ subdRef <- liftIO $ newIORef subd
990+ parentOcc <- liftIO $ getEventSubscribedOcc subd
1790991 occRef <- liftIO $ newIORef parentOcc
1791992 when (isJust parentOcc) $ scheduleClear occRef
1792− weakSelf <- liftIO $ newIORef $ error "getSwitchSubscribed: weakSelf not yet initialized"
1793− (subs, slnForSub) <- liftIO $ WeakBag.singleton sub weakSelf cleanupSwitchSubscribed
1794−#ifdef DEBUG_NODEIDS
1795− nid <- liftIO newNodeId
1796−#endif
1797− let !subscribed = SwitchSubscribed
1798− { switchSubscribedCachedSubscribed = switchSubscribed s
1799− , switchSubscribedOccurrence = occRef
993+ heightRef <- liftIO $ newIORef =<< readIORef (eventSubscribedHeightRef subd)
994+ subscribersRef <- liftIO $ newIORef []
995+ let subscribed = SwitchSubscribed
996+ { switchSubscribedOccurrence = occRef
1800997 , switchSubscribedHeight = heightRef
1801− , switchSubscribedSubscribers = subs
998+ , switchSubscribedSubscribers = subscribersRef
999+ , switchSubscribedSelf = sub
1000+ , switchSubscribedSelfWeak = selfWeakRef
18021001 , switchSubscribedOwnInvalidator = i
18031002 , switchSubscribedOwnWeakInvalidator = wiRef
18041003 , switchSubscribedBehaviorParents = parentsRef
18051004 , switchSubscribedParent = switchParent s
1806− , switchSubscribedCurrentParent = subscriptionRef
1807− , switchSubscribedWeakSelf = weakSelf
1005+ , switchSubscribedCurrentParent = subdRef
18081006#ifdef DEBUG_NODEIDS
1809− , switchSubscribedNodeId = nid
1007+ , switchSubscribedNodeId = unsafeNodeId s
18101008#endif
18111009 }
1812− liftIO $ writeIORef weakSelf =<< evaluate =<< mkWeakPtrWithDebug subscribed "switchSubscribedWeakSelf"
1813− liftIO $ writeIORef subscribedRef $! subscribed
1010+ liftIO $ writeIORef subscribedRef subscribed
18141011 liftIO $ writeIORef (switchSubscribed s) $ Just subscribed
1815− return (slnForSub, subscribed, parentOcc)
1012+ return subscribed
18161013
1817−cleanupSwitchSubscribed :: SwitchSubscribed x a -> IO ()
1818−cleanupSwitchSubscribed subscribed = do
1819− unsubscribe =<< readIORef (switchSubscribedCurrentParent subscribed)
1820− finalize =<< readIORef (switchSubscribedOwnWeakInvalidator subscribed) -- We don't need to get invalidated if we're dead
1821− writeIORef (switchSubscribedCachedSubscribed subscribed) Nothing
1822−
1823−{-# INLINE subscribeSwitchSubscribed #-}
1824−subscribeSwitchSubscribed :: SwitchSubscribed x a -> Subscriber x a -> IO WeakBagTicket
1825−subscribeSwitchSubscribed subscribed sub = WeakBag.insert sub (switchSubscribedSubscribers subscribed) (switchSubscribedWeakSelf subscribed) cleanupSwitchSubscribed
1826−
1827−{-# INLINABLE getCoincidenceSubscribed #-}
1828−getCoincidenceSubscribed :: forall x a. HasSpiderTimeline x => Coincidence x a -> Subscriber x a -> EventM x (WeakBagTicket, CoincidenceSubscribed x a, Maybe a)
1829−getCoincidenceSubscribed c sub = do
1014+getCoincidenceSubscribed :: forall a. Coincidence a -> EventM (CoincidenceSubscribed a)
1015+getCoincidenceSubscribed c = do
18301016 mSubscribed <- liftIO $ readIORef $ coincidenceSubscribed c
18311017 case mSubscribed of
1832− Just subscribed -> {-# SCC "hitCoincidence" #-} liftIO $ do
1833− sln <- subscribeCoincidenceSubscribed subscribed sub
1834− occ <- readIORef $ coincidenceSubscribedOccurrence subscribed
1835− return (sln, subscribed, occ)
1836− Nothing -> {-# SCC "missCoincidence" #-} do
1018+ Just subscribed -> return subscribed
1019+ Nothing -> do
18371020 subscribedRef <- liftIO $ newIORef $ error "getCoincidenceSubscribed: subscribed has not yet been created"
18381021 subscribedUnsafe <- liftIO $ unsafeInterleaveIO $ readIORef subscribedRef
18391022 subOuter <- liftIO $ newSubscriberCoincidenceOuter subscribedUnsafe
1840− (outerSubscription@(EventSubscription _ outerSubd), outerOcc) <- subscribeAndRead (coincidenceParent c) subOuter
1841− outerHeight <- liftIO $ getEventSubscribedHeight outerSubd
1023+ wsubOuter <- liftIO $ mkWeakPtrWithDebug subOuter "subOuter"
1024+ outerSubd <- subscribe (coincidenceParent c) $ WeakSubscriberSimple wsubOuter
1025+ outerOcc <- liftIO $ getEventSubscribedOcc outerSubd
1026+ outerHeight <- liftIO $ readIORef $ eventSubscribedHeightRef outerSubd
18421027 (occ, height, mInnerSubd) <- case outerOcc of
18431028 Nothing -> return (Nothing, outerHeight, Nothing)
18441029 Just o -> do
@@ -1849,647 +1034,270 @@ getCoincidenceSubscribed c sub = do
18491034 heightRef <- liftIO $ newIORef height
18501035 innerSubdRef <- liftIO $ newIORef mInnerSubd
18511036 scheduleClear innerSubdRef
1852− weakSelf <- liftIO $ newIORef $ error "getCoincidenceSubscribed: weakSelf not yet implemented"
1853− (subs, slnForSub) <- liftIO $ WeakBag.singleton sub weakSelf cleanupCoincidenceSubscribed
1854−#ifdef DEBUG_NODEIDS
1855− nid <- liftIO newNodeId
1856−#endif
1037+ subscribersRef <- liftIO $ newIORef []
18571038 let subscribed = CoincidenceSubscribed
1858− { coincidenceSubscribedCachedSubscribed = coincidenceSubscribed c
1859− , coincidenceSubscribedOccurrence = occRef
1039+ { coincidenceSubscribedOccurrence = occRef
18601040 , coincidenceSubscribedHeight = heightRef
1861− , coincidenceSubscribedSubscribers = subs
1041+ , coincidenceSubscribedSubscribers = subscribersRef
18621042 , coincidenceSubscribedOuter = subOuter
1863− , coincidenceSubscribedOuterParent = outerSubscription
1043+ , coincidenceSubscribedOuterParent = outerSubd
18641044 , coincidenceSubscribedInnerParent = innerSubdRef
1865− , coincidenceSubscribedWeakSelf = weakSelf
18661045#ifdef DEBUG_NODEIDS
1867− , coincidenceSubscribedNodeId = nid
1046+ , coincidenceSubscribedNodeId = unsafeNodeId c
18681047#endif
18691048 }
1870− liftIO $ writeIORef weakSelf =<< evaluate =<< mkWeakPtrWithDebug subscribed "CoincidenceSubscribed"
1871− liftIO $ writeIORef subscribedRef $! subscribed
1049+ liftIO $ writeIORef subscribedRef subscribed
18721050 liftIO $ writeIORef (coincidenceSubscribed c) $ Just subscribed
1873− return (slnForSub, subscribed, occ)
1874−
1875−cleanupCoincidenceSubscribed :: CoincidenceSubscribed x a -> IO ()
1876−cleanupCoincidenceSubscribed subscribed = do
1877− unsubscribe $ coincidenceSubscribedOuterParent subscribed
1878− writeIORef (coincidenceSubscribedCachedSubscribed subscribed) Nothing
1879−
1880−{-# INLINE subscribeCoincidenceSubscribed #-}
1881−subscribeCoincidenceSubscribed :: CoincidenceSubscribed x a -> Subscriber x a -> IO WeakBagTicket
1882−subscribeCoincidenceSubscribed subscribed sub = WeakBag.insert sub (coincidenceSubscribedSubscribers subscribed) (coincidenceSubscribedWeakSelf subscribed) cleanupCoincidenceSubscribed
1883−
1884−{-# INLINE mergeG #-}
1885−mergeG :: forall k q x v. (HasSpiderTimeline x, GCompare k)
1886− => (forall a. q a -> Event x (v a))
1887− -> DynamicS x (PatchDMap k q) -> Event x (DMap k v)
1888−mergeG nt d = cacheEvent (mergeCheap nt d)
1889−
1890−{-# INLINE mergeWithMove #-}
1891−mergeWithMove :: forall k v q x. (HasSpiderTimeline x, GCompare k)
1892− => (forall a. q a -> Event x (v a))
1893− -> DynamicS x (PatchDMapWithMove k q) -> Event x (DMap k v)
1894−mergeWithMove nt d = cacheEvent (mergeCheapWithMove nt d)
1895−
1896−{-# INLINE [1] mergeCheap #-}
1897−mergeCheap
1898− :: forall k x q v. (HasSpiderTimeline x, GCompare k)
1899− => (forall a. q a -> Event x (v a))
1900− -> DynamicS x (PatchDMap k q)
1901− -> Event x (DMap k v)
1902−mergeCheap nt = mergeGCheap' unMergeSubscribedParent getInitialSubscribers updateMe destroy
1903− where
1904− updateMe :: MergeUpdateFunc k v x (PatchDMap k q) (MergeSubscribedParent x)
1905− updateMe subscriber heightBagRef oldParents (PatchDMap p) = do
1906− let f (subscriptionsToKill, ps) (k :=> ComposeMaybe me) = do
1907− (mOldSubd, newPs) <- case me of
1908− Nothing -> return $ DMap.updateLookupWithKey (\_ _ -> Nothing) k ps
1909− Just e -> do
1910− let s = subscriber $ return k
1911− subscription@(EventSubscription _ subd) <- subscribe (nt e) s
1912− newParentHeight <- liftIO $ getEventSubscribedHeight subd
1913− let newParent = MergeSubscribedParent subscription
1914− liftIO $ modifyIORef' heightBagRef $ heightBagAdd newParentHeight
1915− return $ DMap.insertLookupWithKey' (\_ new _ -> new) k newParent ps
1916− forM_ mOldSubd $ \oldSubd -> do
1917− oldHeight <- liftIO $ getEventSubscribedHeight $
1918− _eventSubscription_subscribed $ unMergeSubscribedParent oldSubd
1919−
1920− liftIO $ modifyIORef heightBagRef $ heightBagRemove oldHeight
1921− return (maybeToList (unMergeSubscribedParent <$> mOldSubd) ++ subscriptionsToKill, newPs)
1922− foldM f ([], oldParents) $ DMap.toList p
1923−
1924− getInitialSubscribers :: MergeInitFunc k v q x (MergeSubscribedParent x)
1925− getInitialSubscribers initialParents subscriber = do
1926− subscribers <- forM (DMap.toList initialParents) $ \(k :=> e) -> do
1927− let s = subscriber $ return k
1928− (subscription@(EventSubscription _ parentSubd), parentOcc) <- subscribeAndRead (nt e) s
1929− height <- liftIO $ getEventSubscribedHeight parentSubd
1930− return (fmap (k :=>) parentOcc, height, k :=> MergeSubscribedParent subscription)
1931− return ( DMap.fromDistinctAscList $ mapMaybe (\(x, _, _) -> x) subscribers
1932− , fmap (\(_, h, _) -> h) subscribers --TODO: Assert that there's no invalidHeight in here
1933− , DMap.fromDistinctAscList $ map (\(_, _, x) -> x) subscribers
1934− )
1935−
1936− destroy :: MergeDestroyFunc k (MergeSubscribedParent x)
1937− destroy s = forM_ (DMap.toList s) $ \(_ :=> MergeSubscribedParent sub) -> unsubscribe sub
1938−
1939−{-# INLINE [1] mergeCheapWithMove #-}
1940−mergeCheapWithMove :: forall k x v q. (HasSpiderTimeline x, GCompare k)
1941− => (forall a. q a -> Event x (v a))
1942− -> DynamicS x (PatchDMapWithMove k q)
1943− -> Event x (DMap k v)
1944−mergeCheapWithMove nt = mergeGCheap' _mergeSubscribedParentWithMove_subscription getInitialSubscribers updateMe destroy
1945− where
1946− updateMe :: MergeUpdateFunc k v x (PatchDMapWithMove k q) (MergeSubscribedParentWithMove x k)
1947− updateMe subscriber heightBagRef oldParents p = do
1948− -- Prepare new parents for insertion
1949− let subscribeParent :: forall a. k a -> Event x (v a) -> EventM x (MergeSubscribedParentWithMove x k a)
1950− subscribeParent k e = do
1951− keyRef <- liftIO $ newIORef k
1952− let s = subscriber $ liftIO $ readIORef keyRef
1953− subscription@(EventSubscription _ subd) <- subscribe e s
1954− liftIO $ do
1955− newParentHeight <- getEventSubscribedHeight subd
1956− modifyIORef' heightBagRef $ heightBagAdd newParentHeight
1957− return $ MergeSubscribedParentWithMove subscription keyRef
1958− p' <- PatchDMapWithMove.traversePatchDMapWithMoveWithKey (\k q -> subscribeParent k (nt q)) p
1959− -- Collect old parents for deletion and update the keys of moved parents
1960− let moveOrDelete :: forall a. k a -> PatchDMapWithMove.NodeInfo k q a -> MergeSubscribedParentWithMove x k a -> Constant (EventM x (Maybe (EventSubscription x))) a
1961− moveOrDelete _ ni parent = Constant $ case getComposeMaybe $ PatchDMapWithMove._nodeInfo_to ni of
1962− Nothing -> do
1963− oldHeight <- liftIO $ getEventSubscribedHeight $ _eventSubscription_subscribed $
1964− _mergeSubscribedParentWithMove_subscription parent
1965−
1966− liftIO $ modifyIORef heightBagRef $ heightBagRemove oldHeight
1967− return $ Just $ _mergeSubscribedParentWithMove_subscription parent
1968− Just toKey -> do
1969− liftIO $ writeIORef (_mergeSubscribedParentWithMove_key parent) $! toKey
1970− return Nothing
1971− toDelete <- fmap catMaybes $ mapM (\(_ :=> v) -> getConstant v) $ DMap.toList $
1972− DMap.intersectionWithKey moveOrDelete (unPatchDMapWithMove p) oldParents
1973−
1974− return (toDelete, applyAlways p' oldParents)
1975− getInitialSubscribers :: MergeInitFunc k v q x (MergeSubscribedParentWithMove x k)
1976− getInitialSubscribers initialParents subscriber = do
1977− subscribers <- forM (DMap.toList initialParents) $ \(k :=> e) -> do
1978− keyRef <- liftIO $ newIORef k
1979− let s = subscriber $ liftIO $ readIORef keyRef
1980− (subscription@(EventSubscription _ parentSubd), parentOcc) <- subscribeAndRead (nt e) s
1981− height <- liftIO $ getEventSubscribedHeight parentSubd
1982− return (fmap (k :=>) parentOcc, height, k :=> MergeSubscribedParentWithMove subscription keyRef)
1983− return ( DMap.fromDistinctAscList $ mapMaybe (\(x, _, _) -> x) subscribers
1984− , fmap (\(_, h, _) -> h) subscribers --TODO: Assert that there's no invalidHeight in here
1985− , DMap.fromDistinctAscList $ map (\(_, _, x) -> x) subscribers
1986− )
1987−
1988− destroy :: MergeDestroyFunc k (MergeSubscribedParentWithMove x k)
1989− destroy s = forM_ (DMap.toList s) $ \(_ :=> MergeSubscribedParentWithMove sub _) -> unsubscribe sub
1990−
1991−type MergeUpdateFunc k v x p s
1992− = (forall a. EventM x (k a) -> Subscriber x (v a))
1993− -> IORef HeightBag
1994− -> DMap k s
1995− -> p
1996− -> EventM x ([EventSubscription x], DMap k s)
1997−
1998−type MergeGetSubscription x s = forall a. s a -> EventSubscription x
1999−
2000−type MergeInitFunc k v q x s
2001− = DMap k q
2002− -> (forall a. EventM x (k a) -> Subscriber x (v a))
2003− -> EventM x (DMap k v, [Height], DMap k s)
2004−
2005−type MergeDestroyFunc k s
2006− = DMap k s
2007− -> IO ()
2008−
2009−data Merge x k v s = Merge
2010− { _merge_parentsRef :: {-# UNPACK #-} !(IORef (DMap k s))
2011− , _merge_heightBagRef :: {-# UNPACK #-} !(IORef HeightBag)
2012− , _merge_heightRef :: {-# UNPACK #-} !(IORef Height)
2013− , _merge_sub :: {-# UNPACK #-} !(Subscriber x (DMap k v))
2014− , _merge_accumRef :: {-# UNPACK #-} !(IORef (DMap k v))
2015− }
2016−
2017−invalidateMergeHeight :: Merge x k v s -> IO ()
2018−invalidateMergeHeight m = invalidateMergeHeight' (_merge_heightRef m) (_merge_sub m)
2019−
2020−invalidateMergeHeight' :: IORef Height -> Subscriber x a -> IO ()
2021−invalidateMergeHeight' heightRef sub = do
2022− oldHeight <- readIORef heightRef
2023− -- If the height used to be valid, it must be invalid now; we should never have *more* heights than we have parents
2024− when (oldHeight /= invalidHeight) $ do
2025− writeIORef heightRef $! invalidHeight
2026− subscriberInvalidateHeight sub oldHeight
2027−
2028−revalidateMergeHeight :: Merge x k v s -> IO ()
2029−revalidateMergeHeight m = do
2030− currentHeight <- readIORef $ _merge_heightRef m
2031−
2032− -- revalidateMergeHeight may be called multiple times; perhaps the's a way to finesse it to avoid this check
2033− when (currentHeight == invalidHeight) $ do
2034− heights <- readIORef $ _merge_heightBagRef m
2035− parents <- readIORef $ _merge_parentsRef m
2036− -- When the number of heights in the bag reaches the number of parents, we should have a valid height
2037− case heightBagSize heights `compare` DMap.size parents of
2038− LT -> return ()
2039− EQ -> do
2040− let height = succHeight $ heightBagMax heights
2041− traceInvalidateHeight $ "recalculateSubscriberHeight: height: " <> show height
2042− writeIORef (_merge_heightRef m) $! height
2043− subscriberRecalculateHeight (_merge_sub m) height
2044− GT -> error $ "revalidateMergeHeight: more heights (" <> show (heightBagSize heights) <> ") than parents (" <> show (DMap.size parents) <> ") for Merge"
2045−
2046−scheduleMergeSelf :: HasSpiderTimeline x => Merge x k v s -> Height -> EventM x ()
2047−scheduleMergeSelf m height = scheduleMerge' height (_merge_heightRef m) $ do
2048− vals <- liftIO $ readIORef $ _merge_accumRef m
2049− -- Once we're done with this, we can clear it immediately, because if there's a cacheEvent in front of us,
2050− -- it'll handle subsequent subscribers, and if not, we won't get subsequent subscribers
2051− liftIO $ writeIORef (_merge_accumRef m) $! DMap.empty
2052− --TODO: Assert that m is not empty
2053− subscriberPropagate (_merge_sub m) vals
2054−
2055−checkCycle :: HasSpiderTimeline x => EventSubscribed x -> EventM x ()
2056−checkCycle subscribed = liftIO $ do
2057− height <- readIORef (eventSubscribedHeightRef subscribed)
2058−
2059− -- currentHeight <- getCurrentHeight
2060− -- when (height <= currentHeight) $ if height /= invalidHeight
2061− -- then do
2062− -- myStack <- liftIO $ whoCreatedIORef undefined --TODO
2063− -- error $ "Height (" ++ show height ++ ") is not greater than current height (" ++ show currentHeight ++ ")\n" ++ unlines (reverse myStack)
2064− -- else liftIO $
2065− when (height == invalidHeight) $
2066−#ifdef DEBUG_CYCLES
2067− do
2068− nodesInvolvedInCycle <- walkInvalidHeightParents subscribed
2069− stacks <- forM nodesInvolvedInCycle whoCreatedEventSubscribed
2070− throwIO (EventLoopException stacks)
2071−#else
2072− throwIO EventLoopException
2073−#endif
2074−
1051+ return subscribed
20751052
2076−mergeSubscriber :: forall x k v s a. (HasSpiderTimeline x, GCompare k) => EventSubscribed x -> Merge x k v s -> EventM x (k a) -> Subscriber x (v a)
2077−mergeSubscriber subscribed m getKey = Subscriber
2078− { subscriberPropagate = \a -> do
2079− oldM <- liftIO $ readIORef $ _merge_accumRef m
2080− k <- getKey
2081− let newM = DMap.insertWith (error "Same key fired multiple times for Merge") k a oldM
2082− tracePropagate (Proxy :: Proxy x) $ " DMap.size oldM = " <> show (DMap.size oldM) <> "; DMap.size newM = " <> show (DMap.size newM)
2083− liftIO $ writeIORef (_merge_accumRef m) $! newM
2084− when (DMap.null oldM) $ do -- Only schedule the firing once
2085− height <- liftIO $ readIORef $ _merge_heightRef m
2086− checkCycle subscribed
2087−
2088− scheduleMergeSelf m height
2089− , subscriberInvalidateHeight = \old -> do --TODO: When removing a parent doesn't actually change the height, maybe we can avoid invalidating
2090− modifyIORef' (_merge_heightBagRef m) $ heightBagRemove old
2091− invalidateMergeHeight m
2092− , subscriberRecalculateHeight = \new -> do
2093− modifyIORef' (_merge_heightBagRef m) $ heightBagAdd new
2094− revalidateMergeHeight m
1053+merge :: GCompare k => DMap k Event -> Event (DMap k Identity)
1054+merge m = EventMerge $ Merge
1055+ { mergeParents = m
1056+ , mergeSubscribed = unsafeNewIORef m Nothing
20951057 }
20961058
2097−--TODO: Be able to run as much of this as possible promptly
2098−updateMerge :: (HasSpiderTimeline x, GCompare k) => EventSubscribed x -> Merge x k v s -> MergeUpdateFunc k v x p s -> p -> SomeMergeUpdate x
2099−updateMerge subscribed m updateFunc p = SomeMergeUpdate updateMe (invalidateMergeHeight m) (revalidateMergeHeight m)
2100− where updateMe = do
2101− oldParents <- liftIO $ readIORef $ _merge_parentsRef m
2102− (subscriptionsToKill, newParents) <- updateFunc (mergeSubscriber subscribed m) (_merge_heightBagRef m) oldParents p
2103− liftIO $ writeIORef (_merge_parentsRef m) $! newParents
2104− return subscriptionsToKill
2105−
2106−{-# INLINE mergeGCheap' #-}
2107−mergeGCheap' :: forall k v x p s q. (HasSpiderTimeline x, GCompare k, PatchTarget p ~ DMap k q)
2108− => MergeGetSubscription x s -> MergeInitFunc k v q x s -> MergeUpdateFunc k v x p s -> MergeDestroyFunc k s -> DynamicS x p -> Event x (DMap k v)
2109−mergeGCheap' getParent getInitialSubscribers updateFunc destroy d = Event $ \sub -> do
2110− initialParents <- readBehaviorUntracked $ dynamicCurrent d
2111− accumRef <- liftIO $ newIORef $ error "merge: accumRef not yet initialized"
2112− heightRef <- liftIO $ newIORef $ error "merge: heightRef not yet initialized"
2113− heightBagRef <- liftIO $ newIORef $ error "merge: heightBagRef not yet initialized"
2114− parentsRef :: IORef (DMap k s) <- liftIO $ newIORef $ error "merge: parentsRef not yet initialized"
2115− changeSubdRef <- liftIO $ newIORef $ error "getMergeSubscribed: changeSubdRef not yet initialized"
2116−
2117− let subscribed = EventSubscribed
2118− { eventSubscribedHeightRef = heightRef
2119− , eventSubscribedRetained = toAny (parentsRef, changeSubdRef)
2120−#ifdef DEBUG_CYCLES
2121− , eventSubscribedGetParents = do
2122− let getParent' (_ :=> v) = _eventSubscription_subscribed (getParent v)
2123− fmap getParent' . DMap.toList <$> readIORef parentsRef
2124− , eventSubscribedHasOwnHeightRef = False
2125− , eventSubscribedWhoCreated = whoCreatedIORef heightRef
2126−#endif
2127− }
2128−
2129− m = Merge
2130− { _merge_parentsRef = parentsRef
2131− , _merge_heightBagRef = heightBagRef
2132− , _merge_heightRef = heightRef
2133− , _merge_sub = sub
2134− , _merge_accumRef = accumRef
2135− }
2136− (dm, heights, initialParentState) <- getInitialSubscribers initialParents $ mergeSubscriber subscribed m
2137− let myHeightBag = heightBagFromList $ filter (/= invalidHeight) heights
2138− myHeight = if invalidHeight `elem` heights
2139− then invalidHeight
2140− else succHeight $ heightBagMax myHeightBag
2141− currentHeight <- getCurrentHeight
2142− let (occ, accum) = if currentHeight >= myHeight -- If we should have fired by now
2143− then (if DMap.null dm then Nothing else Just dm, DMap.empty)
2144− else (Nothing, dm)
2145− unless (DMap.null accum) $ scheduleMergeSelf m myHeight
2146− liftIO $ writeIORef accumRef $! accum
2147− liftIO $ writeIORef heightRef $! myHeight
2148− liftIO $ writeIORef heightBagRef $! myHeightBag
2149− liftIO $ writeIORef parentsRef $! initialParentState
2150− defer $ SomeMergeInit $ do
2151− let changeSubscriber = Subscriber
2152− { subscriberPropagate = \a -> {-# SCC "traverseMergeChange" #-} do
2153− tracePropagate (Proxy :: Proxy x) "SubscriberMerge/Change"
2154− defer $ updateMerge subscribed m updateFunc a
2155− , subscriberInvalidateHeight = \_ -> return ()
2156− , subscriberRecalculateHeight = \_ -> return ()
2157− }
2158− (changeSubscription, change) <- subscribeAndRead (dynamicUpdated d) changeSubscriber
2159− forM_ change $ \c -> defer $ updateMerge subscribed m updateFunc c
2160− -- We explicitly hold on to the unsubscribe function from subscribing to the update event.
2161− -- If we don't do this, there are certain cases where mergeCheap will fail to properly retain
2162− -- its subscription.
2163− liftIO $ writeIORef changeSubdRef (changeSubscriber, changeSubscription)
2164− let unsubscribeAll = destroy =<< readIORef parentsRef
2165−
2166− return (EventSubscription unsubscribeAll subscribed, occ)
2167−
2168−
2169−mergeInt :: forall x a. (HasSpiderTimeline x) => DynamicS x (PatchIntMap (Event x a)) -> Event x (IntMap a)
2170−mergeInt = cacheEvent . mergeIntCheap
2171−
2172−{-# INLINABLE mergeIntCheap #-}
2173−mergeIntCheap :: forall x a. (HasSpiderTimeline x) => DynamicS x (PatchIntMap (Event x a)) -> Event x (IntMap a)
2174−mergeIntCheap d = Event $ \sub -> do
2175− initialParents <- readBehaviorUntracked $ dynamicCurrent d
2176− accum <- liftIO $ FastMutableIntMap.newEmpty
2177− heightRef <- liftIO $ newIORef zeroHeight
2178− heightBagRef <- liftIO $ newIORef heightBagEmpty
2179− parents <- liftIO $ FastMutableIntMap.newEmpty
2180− changeSubdRef <- liftIO $ newIORef $ error "getMergeSubscribed: changeSubdRef not yet initialized"
2181− let subscribed = EventSubscribed
2182− { eventSubscribedHeightRef = heightRef
2183− , eventSubscribedRetained = toAny (parents, changeSubdRef)
2184−#ifdef DEBUG_CYCLES
2185− , eventSubscribedGetParents = fmap (_eventSubscription_subscribed . snd) <$> FastMutableIntMap.toList parents
2186− , eventSubscribedHasOwnHeightRef = False
2187− , eventSubscribedWhoCreated = whoCreatedIORef heightRef
2188−#endif
2189− }
2190− let scheduleSelf = do
2191− height <- liftIO $ readIORef $ heightRef
2192− scheduleMerge' height heightRef $ do
2193− vals <- liftIO $ FastMutableIntMap.getFrozenAndClear accum
2194− subscriberPropagate sub vals
2195− invalidateMyHeight = invalidateMergeHeight' heightRef sub
2196− recalculateMyHeight = do
2197− currentHeight <- readIORef heightRef
2198− when (currentHeight == invalidHeight) $ do --TODO: This will almost always be true; can we get rid of this check and just proceed to the next one always?
2199− heights <- readIORef heightBagRef
2200− numParents <- FastMutableIntMap.size parents
2201− case heightBagSize heights `compare` numParents of
2202− LT -> return ()
2203− EQ -> do
2204− let height = succHeight $ heightBagMax heights
2205− traceInvalidateHeight $ "recalculateSubscriberHeight: height: " <> show height
2206− writeIORef heightRef $! height
2207− subscriberRecalculateHeight sub height
2208− GT -> error $ "revalidateMergeHeight: more heights (" <> show (heightBagSize heights) <> ") than parents (" <> show numParents <> ") for Merge"
2209− mySubscriber k = Subscriber
2210− { subscriberPropagate = \a -> do
2211− checkCycle subscribed
2212−
2213− wasEmpty <- liftIO $ FastMutableIntMap.isEmpty accum
2214− liftIO $ FastMutableIntMap.insert accum k a
2215− when wasEmpty scheduleSelf
2216− , subscriberInvalidateHeight = \old -> do
2217− modifyIORef' heightBagRef $ heightBagRemove old
2218− invalidateMyHeight
2219− , subscriberRecalculateHeight = \new -> do
2220− modifyIORef' heightBagRef $ heightBagAdd new
2221− recalculateMyHeight
2222− }
2223− forM_ (IntMap.toList initialParents) $ \(k, p) -> do
2224− (subscription@(EventSubscription _ parentSubd), parentOcc) <- subscribeAndRead p $ mySubscriber k
2225− liftIO $ do
2226− forM_ parentOcc $ FastMutableIntMap.insert accum k
2227− FastMutableIntMap.insert parents k subscription
2228− height <- getEventSubscribedHeight parentSubd
2229− if height == invalidHeight
2230− then writeIORef heightRef invalidHeight
2231− else do
2232− modifyIORef' heightBagRef $ heightBagAdd height
2233− modifyIORef' heightRef $ \oldHeight ->
2234− if oldHeight == invalidHeight
2235− then invalidHeight
2236− else max (succHeight height) oldHeight
2237− myHeight <- liftIO $ readIORef heightRef
2238− currentHeight <- getCurrentHeight
2239− isEmpty <- liftIO $ FastMutableIntMap.isEmpty accum
2240− occ <- if currentHeight >= myHeight -- If we should have fired by now
2241− then if isEmpty
2242− then return Nothing
2243− else liftIO $ Just <$> FastMutableIntMap.getFrozenAndClear accum
2244− else do when (not isEmpty) scheduleSelf -- We have things accumulated, but we shouldn't have fired them yet
2245− return Nothing
2246− defer $ SomeMergeInit $ do
2247− let updateMe a = SomeMergeUpdate u invalidateMyHeight recalculateMyHeight
2248− where
2249− u = do
2250− let f k newParent = do
2251− subscription@(EventSubscription _ subd) <- subscribe newParent $ mySubscriber k
2252− newParentHeight <- liftIO $ getEventSubscribedHeight subd
2253− liftIO $ modifyIORef' heightBagRef $ heightBagAdd newParentHeight
2254− return subscription
2255− newSubscriptions <- FastMutableIntMap.traverseIntMapPatchWithKey f a
2256− oldParents <- liftIO $ FastMutableIntMap.applyPatch parents newSubscriptions
2257− liftIO $ for_ oldParents $ \oldParent -> do
2258− oldParentHeight <- getEventSubscribedHeight $ _eventSubscription_subscribed oldParent
2259−
2260− print ("updateMe", oldParentHeight)
2261− modifyIORef' heightBagRef $ heightBagRemove oldParentHeight
2262− return $ IntMap.elems oldParents
2263− let changeSubscriber = Subscriber
2264− { subscriberPropagate = \a -> {-# SCC "traverseMergeChange" #-} do
2265− tracePropagate (Proxy :: Proxy x) $ "SubscriberMergeInt/Change"
2266− defer $ updateMe a
2267− , subscriberInvalidateHeight = \_ -> return ()
2268− , subscriberRecalculateHeight = \_ -> return ()
2269− }
2270− (changeSubscription, change) <- subscribeAndRead (dynamicUpdated d) changeSubscriber
2271− forM_ change $ \c -> defer $ updateMe c
2272− -- We explicitly hold on to the unsubscribe function from subscribing to the update event.
2273− -- If we don't do this, there are certain cases where mergeCheap will fail to properly retain
2274− -- its subscription.
2275− liftIO $ writeIORef changeSubdRef (changeSubscriber, changeSubscription)
2276− let unsubscribeAll = traverse_ unsubscribe =<< FastMutableIntMap.getFrozenAndClear parents
2277−
2278−
2279− return (EventSubscription unsubscribeAll subscribed, occ)
1059+newtype EventSelector k = EventSelector { select :: forall a. k a -> Event a }
22801060
2281−newtype EventSelector x k = EventSelector { select :: forall a. k a -> Event x a }
2282−newtype EventSelectorG x k v = EventSelectorG { selectG :: forall a. k a -> Event x (v a) }
2283−
2284−fanG :: (HasSpiderTimeline x, GCompare k) => Event x (DMap k v) -> EventSelectorG x k v
2285−fanG e = unsafePerformIO $ do
2286− ref <- newIORef Nothing
1061+fan :: GCompare k => Event (DMap k Identity) -> EventSelector k
1062+fan e =
22871063 let f = Fan
22881064 { fanParent = e
2289− , fanSubscribed = ref
1065+ , fanSubscribed = unsafeNewIORef e Nothing
22901066 }
2291− pure $ EventSelectorG $ \k -> eventFan k f
2292−
2293−runHoldInits :: HasSpiderTimeline x => IORef [SomeHoldInit x] -> IORef [SomeDynInit x] -> IORef [SomeMergeInit x] -> EventM x ()
2294−runHoldInits holdInitRef dynInitRef mergeInitRef = do
2295− holdInits <- liftIO $ readIORef holdInitRef
2296− dynInits <- liftIO $ readIORef dynInitRef
2297− mergeInits <- liftIO $ readIORef mergeInitRef
2298− unless (null holdInits && null dynInits && null mergeInits) $ do
2299− liftIO $ writeIORef holdInitRef []
2300− liftIO $ writeIORef dynInitRef []
2301− liftIO $ writeIORef mergeInitRef []
2302− mapM_ initHold holdInits
2303− mapM_ initDyn dynInits
2304− mapM_ unSomeMergeInit mergeInits
2305− runHoldInits holdInitRef dynInitRef mergeInitRef
2306−
2307−initHold :: HasSpiderTimeline x => SomeHoldInit x -> EventM x ()
2308−initHold (SomeHoldInit h) = void $ getHoldEventSubscription h
2309−
2310−initDyn :: HasSpiderTimeline x => SomeDynInit x -> EventM x ()
2311−initDyn (SomeDynInit d) = void $ getDynHold d
2312−
2313−newEventEnv :: IO (EventEnv x)
2314−newEventEnv = do
1067+ in EventSelector $ \k -> EventFan k f
1068+
1069+-- | Run an event action outside of a frame
1070+runFrame :: EventM a -> IO a
1071+runFrame a = do
23151072 toAssignRef <- newIORef [] -- This should only actually get used when events are firing
23161073 holdInitRef <- newIORef []
2317− dynInitRef <- newIORef []
2318− mergeUpdateRef <- newIORef []
2319− mergeInitRef <- newIORef []
2320− heightRef <- newIORef zeroHeight
1074+ heightRef <- newIORef 0
23211075 toClearRef <- newIORef []
2322− toClearIntRef <- newIORef []
23231076 toClearRootRef <- newIORef []
23241077 coincidenceInfosRef <- newIORef []
2325− delayedRef <- newIORef IntMap.empty
2326− return $ EventEnv toAssignRef holdInitRef dynInitRef mergeUpdateRef mergeInitRef toClearRef toClearIntRef toClearRootRef heightRef coincidenceInfosRef delayedRef
2327−
2328−clearEventEnv :: EventEnv x -> IO ()
2329−clearEventEnv (EventEnv toAssignRef holdInitRef dynInitRef mergeUpdateRef mergeInitRef toClearRef toClearIntRef toClearRootRef heightRef coincidenceInfosRef delayedRef) = do
2330− writeIORef toAssignRef []
2331− writeIORef holdInitRef []
2332− writeIORef dynInitRef []
2333− writeIORef mergeUpdateRef []
2334− writeIORef mergeInitRef []
2335− writeIORef heightRef zeroHeight
2336− writeIORef toClearRef []
2337− writeIORef toClearIntRef []
2338− writeIORef toClearRootRef []
2339− writeIORef coincidenceInfosRef []
2340− writeIORef delayedRef IntMap.empty
2341−
2342−-- | Run an event action outside of a frame
2343−runFrame :: forall x a. HasSpiderTimeline x => EventM x a -> SpiderHost x a --TODO: This function also needs to hold the mutex
2344−runFrame a = SpiderHost $ do
2345− let env = _spiderTimeline_eventEnv $ unSTE (spiderTimeline :: SpiderTimelineEnv x)
2346− let go = do
2347− result <- a
2348− runHoldInits (eventEnvHoldInits env) (eventEnvDynInits env) (eventEnvMergeInits env) -- This must happen before doing the assignments, in case subscribing a Hold causes existing Holds to be read by the newly-propagated events
2349− return result
2350− result <- runEventM go
2351− toClear <- readIORef $ eventEnvClears env
2352− forM_ toClear $ \(Some (Clear ref)) -> {-# SCC "clear" #-} writeIORef ref Nothing
2353− toClearInt <- readIORef $ eventEnvIntClears env
2354− forM_ toClearInt $ \(Some (IntClear ref)) -> {-# SCC "intClear" #-} writeIORef ref $! IntMap.empty
2355− toClearRoot <- readIORef $ eventEnvRootClears env
2356− forM_ toClearRoot $ \(Some (RootClear ref)) -> {-# SCC "rootClear" #-} writeIORef ref $! DMap.empty
2357− toAssign <- readIORef $ eventEnvAssignments env
1078+ delayedRef <- liftIO $ newIORef IntMap.empty
1079+ result <- flip runEventM (EventEnv toAssignRef holdInitRef toClearRef toClearRootRef heightRef coincidenceInfosRef delayedRef) $ do
1080+ result <- a
1081+ let runHoldInits = do
1082+ holdInits <- liftIO $ readIORef holdInitRef
1083+ if null holdInits then return () else do
1084+ liftIO $ writeIORef holdInitRef []
1085+ forM_ holdInits $ \(SomeHoldInit e h) -> subscribeHold e h
1086+ runHoldInits
1087+ runHoldInits -- This must happen before doing the assignments, in case subscribing a Hold causes existing Holds to be read by the newly-propagated events
1088+ return result
1089+ toClear <- readIORef toClearRef
1090+ forM_ toClear $ \(SomeMaybeIORef ref) -> writeIORef ref Nothing
1091+ toClearRoot <- readIORef toClearRootRef
1092+ forM_ toClearRoot $ \(SomeDMapIORef ref) -> writeIORef ref DMap.empty
1093+ toAssign <- readIORef toAssignRef
23581094 toReconnectRef <- newIORef []
2359− coincidenceInfos <- readIORef $ eventEnvResetCoincidences env
2360− forM_ toAssign $ \(SomeAssignment vRef iRef v) -> {-# SCC "assignment" #-} do
2361− writeIORef vRef v
2362− traceInvalidate $ "Invalidating Hold"
2363− writeIORef iRef =<< evaluate =<< invalidate toReconnectRef =<< readIORef iRef
2364− mergeUpdates <- readIORef $ eventEnvMergeUpdates env
2365− writeIORef (eventEnvMergeUpdates env) []
2366− tracePropagate (Proxy::Proxy x) $ "Updating merges"
2367− mergeSubscriptionsToKill <- runEventM $ concat <$> mapM _someMergeUpdate_update mergeUpdates
2368− tracePropagate (Proxy::Proxy x) $ "Updating merges done"
1095+ forM_ toAssign $ \(SomeAssignment h v) -> do
1096+ writeIORef (holdValue h) v
1097+ writeIORef (holdInvalidators h) =<< invalidate toReconnectRef =<< readIORef (holdInvalidators h)
1098+ coincidenceInfos <- readIORef coincidenceInfosRef
1099+ forM_ coincidenceInfos $ \(SomeCoincidenceInfo wsubInner subInner mcs) -> do
1100+ touch subInner
1101+ finalize wsubInner
1102+ mapM_ invalidateCoincidenceHeight mcs
23691103 toReconnect <- readIORef toReconnectRef
2370− clearEventEnv env
2371− switchSubscriptionsToKill <- forM toReconnect $ \(SomeSwitchSubscribed subscribed) -> {-# SCC "switchSubscribed" #-} do
2372− oldSubscription <- readIORef $ switchSubscribedCurrentParent subscribed
1104+ forM_ toReconnect $ \(SomeSwitchSubscribed subscribed) -> do
1105+ wsub <- readIORef $ switchSubscribedSelfWeak subscribed
1106+ finalize wsub
23731107 wi <- readIORef $ switchSubscribedOwnWeakInvalidator subscribed
2374− traceInvalidate $ "Finalizing invalidator for Switch" <> showNodeId subscribed
23751108 finalize wi
2376− i <- evaluate $ switchSubscribedOwnInvalidator subscribed
1109+ let !i = switchSubscribedOwnInvalidator subscribed
23771110 wi' <- mkWeakPtrWithDebug i "wi'"
2378− writeIORef (switchSubscribedOwnWeakInvalidator subscribed) $! wi'
23791111 writeIORef (switchSubscribedBehaviorParents subscribed) []
2380− writeIORef (eventEnvHoldInits env) [] --TODO: Should we reuse this?
2381− e <- runBehaviorM (readBehaviorTracked (switchSubscribedParent subscribed)) (Just (wi', switchSubscribedBehaviorParents subscribed)) $ eventEnvHoldInits env
2382− runEventM $ runHoldInits (eventEnvHoldInits env) (eventEnvDynInits env) (eventEnvMergeInits env) --TODO: Is this actually OK? It seems like it should be, since we know that no events are firing at this point, but it still seems inelegant
1112+ e <- runBehaviorM (readBehaviorTracked (switchSubscribedParent subscribed)) (Just (wi', switchSubscribedBehaviorParents subscribed))
23831113 --TODO: Make sure we touch the pieces of the SwitchSubscribed at the appropriate times
2384− sub <- newSubscriberSwitch subscribed
2385− subscription <- unSpiderHost $ runFrame $ {-# SCC "subscribeSwitch" #-} subscribe e sub --TODO: Assert that the event isn't firing --TODO: This should not loop because none of the events should be firing, but still, it is inefficient
1114+ let !sub = switchSubscribedSelf subscribed -- Must be done strictly, or the weak pointer will refer to a useless thunk
1115+ wsub' <- mkWeakPtrWithDebug sub "wsub'"
1116+ writeIORef (switchSubscribedSelfWeak subscribed) wsub'
1117+ subd' <- runFrame $ subscribe e $ WeakSubscriberSimple wsub' --TODO: Assert that the event isn't firing --TODO: This should not loop because none of the events should be firing, but still, it is inefficient
23861118 {-
2387− stackTrace <- liftIO $ fmap renderStack $ ccsToStrings =<< (getCCSOf $! switchSubscribedParent subscribed)
2388− liftIO $ debugStrLn $ (++stackTrace) $ "subd' subscribed to " ++ case e of
1119+ stackTrace <- liftIO $ liftM renderStack $ ccsToStrings =<< (getCCSOf $! switchSubscribedParent subscribed)
1120+ liftIO $ putStrLn $ (++stackTrace) $ "subd' subscribed to " ++ case e of
23891121 EventRoot _ -> "EventRoot"
23901122 EventNever -> "EventNever"
23911123 _ -> "something else"
23921124 -}
2393− writeIORef (switchSubscribedCurrentParent subscribed) $! subscription
2394− return oldSubscription
2395− liftIO $ mapM_ unsubscribe mergeSubscriptionsToKill
2396− liftIO $ mapM_ unsubscribe switchSubscriptionsToKill
2397− forM_ toReconnect $ \(SomeSwitchSubscribed subscribed) -> {-# SCC "switchSubscribed" #-} do
2398− EventSubscription _ subd' <- readIORef $ switchSubscribedCurrentParent subscribed
2399− parentHeight <- getEventSubscribedHeight subd'
1125+ writeIORef (switchSubscribedCurrentParent subscribed) subd'
1126+ parentHeight <- readIORef $ eventSubscribedHeightRef subd'
24001127 myHeight <- readIORef $ switchSubscribedHeight subscribed
2401− when (parentHeight /= myHeight) $ do
2402− writeIORef (switchSubscribedHeight subscribed) $! invalidHeight
2403− WeakBag.traverse_ (switchSubscribedSubscribers subscribed) $ invalidateSubscriberHeight myHeight
2404− mapM_ _someMergeUpdate_invalidateHeight mergeUpdates --TODO: In addition to when the patch is completely empty, we should also not run this if it has some Nothing values, but none of them have actually had any effect; potentially, we could even check for Just values with no effect (e.g. by comparing their IORefs and ignoring them if they are unchanged); actually, we could just check if the new height is different
2405− forM_ coincidenceInfos $ \(SomeResetCoincidence subscription mcs) -> do
2406− unsubscribe subscription
2407− mapM_ invalidateCoincidenceHeight mcs
2408− forM_ coincidenceInfos $ \(SomeResetCoincidence _ mcs) -> mapM_ recalculateCoincidenceHeight mcs
2409− mapM_ _someMergeUpdate_recalculateHeight mergeUpdates
1128+ if parentHeight == myHeight then return () else do
1129+ writeIORef (switchSubscribedHeight subscribed) parentHeight
1130+ mapM_ invalidateSubscriberHeight =<< readIORef (switchSubscribedSubscribers subscribed)
1131+ forM_ coincidenceInfos $ \(SomeCoincidenceInfo _ _ mcs) -> mapM_ recalculateCoincidenceHeight mcs
24101132 forM_ toReconnect $ \(SomeSwitchSubscribed subscribed) -> do
2411− height <- calculateSwitchHeight subscribed
2412− updateSwitchHeight height subscribed
1133+ mapM_ recalculateSubscriberHeight =<< readIORef (switchSubscribedSubscribers subscribed)
24131134 return result
24141135
2415−newtype Height = Height { unHeight :: Int } deriving (Show, Read, Eq, Ord, Bounded)
2416−
2417−{-# INLINE zeroHeight #-}
2418−zeroHeight :: Height
2419−zeroHeight = Height 0
2420−
2421−{-# INLINE invalidHeight #-}
2422−invalidHeight :: Height
2423−invalidHeight = Height (-1000)
2424−
2425−#ifdef DEBUG_CYCLES
2426−-- | An invalid height that is currently being traversed, e.g. by walkInvalidHeightParents
2427−{-# INLINE invalidHeightBeingTraversed #-}
2428−invalidHeightBeingTraversed :: Height
2429−invalidHeightBeingTraversed = Height (-1001)
2430−#endif
2431−
2432−{-# INLINE succHeight #-}
2433−succHeight :: Height -> Height
2434−succHeight h@(Height a) =
2435− if h == invalidHeight
2436− then invalidHeight
2437− else Height $ succ a
2438−
2439−invalidateCoincidenceHeight :: CoincidenceSubscribed x a -> IO ()
1136+invalidHeight :: Int
1137+invalidHeight = -1000
1138+
1139+invalidateSubscriberHeight :: WeakSubscriber a -> IO ()
1140+invalidateSubscriberHeight ws = do
1141+ ms <- deRefWeakSubscriber ws
1142+ case ms of
1143+ Nothing -> return () --TODO: cleanup?
1144+ Just s -> case s of
1145+ SubscriberPush _ subscribed -> do
1146+ when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberPush" <> showNodeId subscribed
1147+ mapM_ invalidateSubscriberHeight =<< readIORef (pushSubscribedSubscribers subscribed)
1148+ when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberPush" <> showNodeId subscribed <> " done"
1149+ SubscriberMerge _ subscribed -> do
1150+ when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberMerge" <> showNodeId subscribed
1151+ oldHeight <- readIORef $ mergeSubscribedHeight subscribed
1152+ when (oldHeight /= invalidHeight) $ do
1153+ writeIORef (mergeSubscribedHeight subscribed) $ invalidHeight
1154+ mapM_ invalidateSubscriberHeight =<< readIORef (mergeSubscribedSubscribers subscribed)
1155+ when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberMerge" <> showNodeId subscribed <> " done"
1156+ SubscriberFan subscribed -> do
1157+ when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberFan" <> showNodeId subscribed
1158+ subscribers <- readIORef $ fanSubscribedSubscribers subscribed
1159+ forM_ (DMap.toList subscribers) $ ((\(FanSubscriberKey _ :=> Identity v) -> mapM_ invalidateSubscriberHeight v) :: DSum (FanSubscriberKey k) Identity -> IO ())
1160+ when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberFan" <> showNodeId subscribed <> " done"
1161+ SubscriberHold _ -> return ()
1162+ SubscriberSwitch subscribed -> do
1163+ when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberSwitch" <> showNodeId subscribed
1164+ oldHeight <- readIORef $ switchSubscribedHeight subscribed
1165+ when (oldHeight /= invalidHeight) $ do
1166+ writeIORef (switchSubscribedHeight subscribed) $ invalidHeight
1167+ mapM_ invalidateSubscriberHeight =<< readIORef (switchSubscribedSubscribers subscribed)
1168+ when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberSwitch" <> showNodeId subscribed <> " done"
1169+ SubscriberCoincidenceOuter subscribed -> do
1170+ when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberCoincidenceOuter" <> showNodeId subscribed
1171+ invalidateCoincidenceHeight subscribed
1172+ when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberCoincidenceOuter" <> showNodeId subscribed <> " done"
1173+ SubscriberCoincidenceInner subscribed -> do
1174+ when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberCoincidenceInner" <> showNodeId subscribed
1175+ invalidateCoincidenceHeight subscribed
1176+ when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberCoincidenceInner" <> showNodeId subscribed <> " done"
1177+
1178+invalidateCoincidenceHeight :: CoincidenceSubscribed a -> IO ()
24401179invalidateCoincidenceHeight subscribed = do
24411180 oldHeight <- readIORef $ coincidenceSubscribedHeight subscribed
24421181 when (oldHeight /= invalidHeight) $ do
2443− writeIORef (coincidenceSubscribedHeight subscribed) $! invalidHeight
2444− WeakBag.traverse_ (coincidenceSubscribedSubscribers subscribed) $ invalidateSubscriberHeight oldHeight
2445−
2446−updateSwitchHeight :: Height -> SwitchSubscribed x a -> IO ()
2447−updateSwitchHeight new subscribed = do
2448− oldHeight <- readIORef $ switchSubscribedHeight subscribed
2449− when (oldHeight == invalidHeight) $ do --TODO: This 'when' should probably be an assertion
2450− when (new /= invalidHeight) $ do --TODO: This 'when' should probably be an assertion
2451− writeIORef (switchSubscribedHeight subscribed) $! new
2452− WeakBag.traverse_ (switchSubscribedSubscribers subscribed) $ recalculateSubscriberHeight new
2453−
2454−recalculateCoincidenceHeight :: CoincidenceSubscribed x a -> IO ()
1182+ writeIORef (coincidenceSubscribedHeight subscribed) $ invalidHeight
1183+ mapM_ invalidateSubscriberHeight =<< readIORef (coincidenceSubscribedSubscribers subscribed)
1184+
1185+--TODO: The recalculation algorithm seems a bit funky; make sure it doesn't miss stuff or hit stuff twice; also, it should probably be lazy
1186+
1187+recalculateSubscriberHeight :: WeakSubscriber a -> IO ()
1188+recalculateSubscriberHeight ws = do
1189+ ms <- deRefWeakSubscriber ws
1190+ case ms of
1191+ Nothing -> return () --TODO: cleanup?
1192+ Just s -> case s of
1193+ SubscriberPush _ subscribed -> do
1194+ when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberPush" <> showNodeId subscribed
1195+ mapM_ recalculateSubscriberHeight =<< readIORef (pushSubscribedSubscribers subscribed)
1196+ when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberPush" <> showNodeId subscribed <> " done"
1197+ SubscriberMerge _ subscribed -> do
1198+ when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberMerge" <> showNodeId subscribed
1199+ oldHeight <- readIORef $ mergeSubscribedHeight subscribed
1200+ when (oldHeight == invalidHeight) $ do
1201+ height <- calculateMergeHeight subscribed
1202+ when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: height: " <> show height
1203+ when (height /= invalidHeight) $ do -- If height == invalidHeight, that means some of the prereqs have not yet been recomputed; when they do recompute, they'll catch this node again --TODO: this is O(n*m), where n is the number of children of this noe and m is the number that have been invalidated
1204+ writeIORef (mergeSubscribedHeight subscribed) height
1205+ mapM_ recalculateSubscriberHeight =<< readIORef (mergeSubscribedSubscribers subscribed)
1206+ when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberMerge" <> showNodeId subscribed <> " done"
1207+ SubscriberFan subscribed -> do
1208+ when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberFan" <> showNodeId subscribed
1209+ subscribers <- readIORef $ fanSubscribedSubscribers subscribed
1210+ forM_ (DMap.toList subscribers) $ ((\(FanSubscriberKey _ :=> Identity v) -> mapM_ recalculateSubscriberHeight v) :: DSum (FanSubscriberKey k) Identity -> IO ())
1211+ when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberFan" <> showNodeId subscribed <> " done"
1212+ SubscriberHold _ -> return ()
1213+ SubscriberSwitch subscribed -> do
1214+ when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberSwitch" <> showNodeId subscribed
1215+ oldHeight <- readIORef $ switchSubscribedHeight subscribed
1216+ when (oldHeight == invalidHeight) $ do
1217+ height <- calculateSwitchHeight subscribed
1218+ when (height /= invalidHeight) $ do
1219+ writeIORef (switchSubscribedHeight subscribed) height
1220+ mapM_ recalculateSubscriberHeight =<< readIORef (switchSubscribedSubscribers subscribed)
1221+ when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberSwitch" <> showNodeId subscribed <> " done"
1222+ SubscriberCoincidenceOuter subscribed -> do
1223+ when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberCoincidenceOuter" <> showNodeId subscribed
1224+ void $ recalculateCoincidenceHeight subscribed
1225+ when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberCoincidenceOuter" <> showNodeId subscribed <> " done"
1226+ SubscriberCoincidenceInner subscribed -> do
1227+ when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberCoincidenceInner" <> showNodeId subscribed
1228+ void $ recalculateCoincidenceHeight subscribed
1229+ when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberCoincidenceInner" <> showNodeId subscribed <> " done"
1230+
1231+recalculateCoincidenceHeight :: CoincidenceSubscribed a -> IO ()
24551232recalculateCoincidenceHeight subscribed = do
24561233 oldHeight <- readIORef $ coincidenceSubscribedHeight subscribed
2457− when (oldHeight == invalidHeight) $ do --TODO: This 'when' should probably be an assertion
1234+ when (oldHeight == invalidHeight) $ do
24581235 height <- calculateCoincidenceHeight subscribed
24591236 when (height /= invalidHeight) $ do
2460− writeIORef (coincidenceSubscribedHeight subscribed) $! height
2461− WeakBag.traverse_ (coincidenceSubscribedSubscribers subscribed) $ recalculateSubscriberHeight height
1237+ writeIORef (coincidenceSubscribedHeight subscribed) height
1238+ mapM_ recalculateSubscriberHeight =<< readIORef (coincidenceSubscribedSubscribers subscribed) --TODO: This should probably be mandatory, just like with the merge and switch ones
1239+
1240+calculateMergeHeight :: MergeSubscribed k -> IO Int
1241+calculateMergeHeight subscribed = if DMap.null (mergeSubscribedParents subscribed) then return 0 else do
1242+ heights <- forM (DMap.toList $ mergeSubscribedParents subscribed) $ \(_ :=> es) -> do
1243+ readIORef $ eventSubscribedHeightRef es
1244+ return $ if any (== invalidHeight) heights then invalidHeight else succ $ Prelude.maximum heights --TODO: Replace 'any' with invalidHeight-preserving 'maximum'
24621245
2463−calculateSwitchHeight :: SwitchSubscribed x a -> IO Height
2464−calculateSwitchHeight subscribed = getEventSubscribedHeight . _eventSubscription_subscribed =<< readIORef (switchSubscribedCurrentParent subscribed)
1246+calculateSwitchHeight :: SwitchSubscribed a -> IO Int
1247+calculateSwitchHeight subscribed = readIORef . eventSubscribedHeightRef =<< readIORef (switchSubscribedCurrentParent subscribed)
24651248
2466−calculateCoincidenceHeight :: CoincidenceSubscribed x a -> IO Height
1249+calculateCoincidenceHeight :: CoincidenceSubscribed a -> IO Int
24671250calculateCoincidenceHeight subscribed = do
2468− outerHeight <- getEventSubscribedHeight $ _eventSubscription_subscribed $ coincidenceSubscribedOuterParent subscribed
2469− innerHeight <- maybe (return zeroHeight) getEventSubscribedHeight =<< readIORef (coincidenceSubscribedInnerParent subscribed)
1251+ outerHeight <- readIORef $ eventSubscribedHeightRef $ coincidenceSubscribedOuterParent subscribed
1252+ innerHeight <- maybe (return 0) (readIORef . eventSubscribedHeightRef) =<< readIORef (coincidenceSubscribedInnerParent subscribed)
24701253 return $ if outerHeight == invalidHeight || innerHeight == invalidHeight then invalidHeight else max outerHeight innerHeight
24711254
2472−data SomeSwitchSubscribed x = forall a. SomeSwitchSubscribed {-# NOUNPACK #-} (SwitchSubscribed x a)
1255+{-
1256+recalculateEventSubscribedHeight :: EventSubscribed a -> IO Int
1257+recalculateEventSubscribedHeight es = case es of
1258+ EventSubscribedRoot _ -> return 0
1259+ EventSubscribedNever -> return 0
1260+ EventSubscribedPush subscribed -> recalculateEventSubscribedHeight $ pushSubscribedParent subscribed
1261+ EventSubscribedMerge subscribed -> do
1262+ oldHeight <- readIORef $ mergeSubscribedHeight subscribed
1263+ if oldHeight /= invalidHeight then return oldHeight else do
1264+ height <- calculateMergeHeight subscribed
1265+ writeIORef (mergeSubscribedHeight subscribed) height
1266+ return height
1267+ EventSubscribedFan _ subscribed -> recalculateEventSubscribedHeight $ fanSubscribedParent subscribed
1268+ EventSubscribedSwitch subscribed -> do
1269+ oldHeight <- readIORef $ switchSubscribedHeight subscribed
1270+ if oldHeight /= invalidHeight then return oldHeight else do
1271+ height <- calculateSwitchHeight subscribed
1272+ writeIORef (switchSubscribedHeight subscribed) height
1273+ return height
1274+ EventSubscribedCoincidence subscribed -> recalculateCoincidenceHeight subscribed
1275+-}
1276+
1277+data SomeSwitchSubscribed = forall a. SomeSwitchSubscribed (SwitchSubscribed a)
24731278
2474−invalidate :: IORef [SomeSwitchSubscribed x] -> WeakList (Invalidator x) -> IO (WeakList (Invalidator x))
1279+debugInvalidate :: Bool
1280+debugInvalidate = False
1281+
1282+invalidate :: IORef [SomeSwitchSubscribed] -> WeakList Invalidator -> IO (WeakList Invalidator)
24751283invalidate toReconnectRef wis = do
24761284 forM_ wis $ \wi -> do
24771285 mi <- deRefWeak wi
24781286 case mi of
24791287 Nothing -> do
2480− traceInvalidate "invalidate Dead"
1288+ when debugInvalidate $ liftIO $ putStrLn "invalidate Dead"
24811289 return () --TODO: Should we clean this up here?
24821290 Just i -> do
24831291 finalize wi -- Once something's invalidated, it doesn't need to hang around; this will change when some things are strict
24841292 case i of
24851293 InvalidatorPull p -> do
2486− traceInvalidate $ "invalidate: Pull" <> showNodeId p
1294+ when debugInvalidate $ liftIO $ putStrLn "invalidate Pull"
24871295 mVal <- readIORef $ pullValue p
24881296 forM_ mVal $ \val -> do
24891297 writeIORef (pullValue p) Nothing
2490− writeIORef (pullSubscribedInvalidators val) =<< evaluate =<< invalidate toReconnectRef =<< readIORef (pullSubscribedInvalidators val)
1298+ writeIORef (pullSubscribedInvalidators val) =<< invalidate toReconnectRef =<< readIORef (pullSubscribedInvalidators val)
24911299 InvalidatorSwitch subscribed -> do
2492− traceInvalidate $ "invalidate: Switch" <> showNodeId subscribed
1300+ when debugInvalidate $ liftIO $ putStrLn "invalidate Switch"
24931301 modifyIORef' toReconnectRef (SomeSwitchSubscribed subscribed :)
24941302 return [] -- Since we always finalize everything, always return an empty list --TODO: There are some things that will need to be re-subscribed every time; we should try to avoid finalizing them
24951303
@@ -2497,396 +1305,90 @@ invalidate toReconnectRef wis = do
24971305-- Reflex integration
24981306--------------------------------------------------------------------------------
24991307
2500−-- | Designates the default, global Spider timeline
2501−data SpiderTimeline x
2502−type role SpiderTimeline nominal
2503−
2504−-- | The default, global Spider environment
2505−type Spider = SpiderTimeline Global
2506−
2507−instance HasSpiderTimeline x => Reflex.Class.MonadSample (SpiderTimeline x) (EventM x) where
2508− {-# INLINABLE sample #-}
2509− sample (SpiderBehavior b) = readBehaviorUntracked b
2510−
2511−instance HasSpiderTimeline x => Reflex.Class.MonadHold (SpiderTimeline x) (EventM x) where
2512− {-# INLINABLE hold #-}
2513− hold = holdSpiderEventM
2514− {-# INLINABLE holdDyn #-}
2515− holdDyn = holdDynSpiderEventM
2516− {-# INLINABLE holdIncremental #-}
2517− holdIncremental = holdIncrementalSpiderEventM
2518− {-# INLINABLE buildDynamic #-}
2519− buildDynamic = buildDynamicSpiderEventM
2520− {-# INLINABLE headE #-}
2521− headE = R.slowHeadE
2522−-- headE (SpiderEvent e) = SpiderEvent <$> Reflex.Spider.Internal.headE e
2523− {-# INLINABLE now #-}
2524− now = nowSpiderEventM
2525−
2526−instance Reflex.Class.MonadSample (SpiderTimeline x) (SpiderPullM x) where
2527− {-# INLINABLE sample #-}
2528− sample = coerce . readBehaviorTracked . unSpiderBehavior
2529−
2530−instance HasSpiderTimeline x => Reflex.Class.MonadSample (SpiderTimeline x) (SpiderPushM x) where
2531− {-# INLINABLE sample #-}
2532− sample (SpiderBehavior b) = SpiderPushM $ readBehaviorUntracked b
2533−
2534−instance HasSpiderTimeline x => Reflex.Class.MonadHold (SpiderTimeline x) (SpiderPushM x) where
2535− {-# INLINABLE hold #-}
2536− hold v0 e = Reflex.Class.current <$> Reflex.Class.holdDyn v0 e
2537− {-# INLINABLE holdDyn #-}
2538− holdDyn v0 (SpiderEvent e) = SpiderPushM $ fmap (SpiderDynamic . dynamicHoldIdentity) $ Reflex.Spider.Internal.hold v0 $ coerce e
2539− {-# INLINABLE holdIncremental #-}
2540− holdIncremental v0 (SpiderEvent e) = SpiderPushM $ SpiderIncremental . dynamicHold <$> Reflex.Spider.Internal.hold v0 e
2541− {-# INLINABLE buildDynamic #-}
2542− buildDynamic getV0 (SpiderEvent e) = SpiderPushM $ fmap (SpiderDynamic . dynamicDynIdentity) $ Reflex.Spider.Internal.buildDynamic (coerce getV0) $ coerce e
2543− {-# INLINABLE headE #-}
2544− headE = R.slowHeadE
2545−-- headE (SpiderEvent e) = SpiderPushM $ SpiderEvent <$> Reflex.Spider.Internal.headE e
2546− {-# INLINABLE now #-}
2547− now = SpiderPushM nowSpiderEventM
2548−
2549−
2550−instance HasSpiderTimeline x => Monad (Reflex.Class.Dynamic (SpiderTimeline x)) where
2551− {-# INLINE return #-}
2552− return = pure
2553− {-# INLINE (>>=) #-}
2554− x >>= f = SpiderDynamic $ dynamicDynIdentity $ newJoinDyn $ newMapDyn (unSpiderDynamic . f) $ unSpiderDynamic x
2555− {-# INLINE (>>) #-}
2556− (>>) = (*>)
2557−#if !MIN_VERSION_base(4,13,0)
2558− {-# INLINE fail #-}
2559− fail _ = error "Dynamic does not support 'fail'"
2560−#endif
2561−
2562−{-# INLINABLE newJoinDyn #-}
2563−newJoinDyn :: HasSpiderTimeline x => DynamicS x (Identity (DynamicS x (Identity a))) -> Reflex.Spider.Internal.Dyn x (Identity a)
2564−newJoinDyn d =
2565− let readV0 = readBehaviorTracked . dynamicCurrent =<< readBehaviorTracked (dynamicCurrent d)
2566− eOuter = Reflex.Spider.Internal.push (fmap (Just . Identity) . readBehaviorUntracked . dynamicCurrent . runIdentity) $ dynamicUpdated d
2567− eInner = Reflex.Spider.Internal.switch $ dynamicUpdated <$> dynamicCurrent d
2568− eBoth = Reflex.Spider.Internal.coincidence $ dynamicUpdated . runIdentity <$> dynamicUpdated d
2569− v' = unSpiderEvent $ Reflex.Class.leftmost $ map SpiderEvent [eBoth, eOuter, eInner]
2570− in Reflex.Spider.Internal.unsafeBuildDynamic readV0 v'
2571−
2572−instance HasSpiderTimeline x => Functor (Reflex.Class.Dynamic (SpiderTimeline x)) where
2573− fmap = mapDynamicSpider
2574− x <$ d = R.unsafeBuildDynamic (return x) $ x <$ R.updated d
2575−
2576−mapDynamicSpider :: HasSpiderTimeline x => (a -> b) -> Reflex.Class.Dynamic (SpiderTimeline x) a -> Reflex.Class.Dynamic (SpiderTimeline x) b
2577−mapDynamicSpider f = SpiderDynamic . newMapDyn f . unSpiderDynamic
2578−{-# INLINE [1] mapDynamicSpider #-}
2579−
2580−instance HasSpiderTimeline x => Applicative (Reflex.Class.Dynamic (SpiderTimeline x)) where
2581− pure = SpiderDynamic . dynamicConst
2582−#if MIN_VERSION_base(4,10,0)
2583− liftA2 f a b = SpiderDynamic $ Reflex.Spider.Internal.zipDynWith f (unSpiderDynamic a) (unSpiderDynamic b)
2584−#endif
2585− SpiderDynamic a <*> SpiderDynamic b = SpiderDynamic $ Reflex.Spider.Internal.zipDynWith ($) a b
2586− a *> b = R.unsafeBuildDynamic (R.sample $ R.current b) $ R.leftmost [R.updated b, R.tag (R.current b) $ R.updated a]
2587− (<*) = flip (*>) -- There are no effects, so order doesn't matter
2588−
2589−holdSpiderEventM :: HasSpiderTimeline x => a -> Reflex.Class.Event (SpiderTimeline x) a -> EventM x (Reflex.Class.Behavior (SpiderTimeline x) a)
2590−holdSpiderEventM v0 e = fmap (SpiderBehavior . behaviorHoldIdentity) $ Reflex.Spider.Internal.hold v0 $ coerce $ unSpiderEvent e
2591−
2592−holdDynSpiderEventM :: HasSpiderTimeline x => a -> Reflex.Class.Event (SpiderTimeline x) a -> EventM x (Reflex.Class.Dynamic (SpiderTimeline x) a)
2593−holdDynSpiderEventM v0 e = fmap (SpiderDynamic . dynamicHoldIdentity) $ Reflex.Spider.Internal.hold v0 $ coerce $ unSpiderEvent e
2594−
2595−holdIncrementalSpiderEventM :: (HasSpiderTimeline x, Patch p) => PatchTarget p -> Reflex.Class.Event (SpiderTimeline x) p -> EventM x (Reflex.Class.Incremental (SpiderTimeline x) p)
2596−holdIncrementalSpiderEventM v0 e = fmap (SpiderIncremental . dynamicHold) $ Reflex.Spider.Internal.hold v0 $ unSpiderEvent e
2597−
2598−buildDynamicSpiderEventM :: HasSpiderTimeline x => SpiderPushM x a -> Reflex.Class.Event (SpiderTimeline x) a -> EventM x (Reflex.Class.Dynamic (SpiderTimeline x) a)
2599−buildDynamicSpiderEventM getV0 e = fmap (SpiderDynamic . dynamicDynIdentity) $ Reflex.Spider.Internal.buildDynamic (coerce getV0) $ coerce $ unSpiderEvent e
2600−
2601−instance HasSpiderTimeline x => Reflex.Class.MonadHold (SpiderTimeline x) (SpiderHost x) where
2602− {-# INLINABLE hold #-}
2603− hold v0 e = runFrame . runSpiderHostFrame $ Reflex.Class.hold v0 e
2604− {-# INLINABLE holdDyn #-}
2605− holdDyn v0 e = runFrame . runSpiderHostFrame $ Reflex.Class.holdDyn v0 e
2606− {-# INLINABLE holdIncremental #-}
2607− holdIncremental v0 e = runFrame . runSpiderHostFrame $ Reflex.Class.holdIncremental v0 e
2608− {-# INLINABLE buildDynamic #-}
2609− buildDynamic getV0 e = runFrame . runSpiderHostFrame $ Reflex.Class.buildDynamic getV0 e
2610− {-# INLINABLE headE #-}
2611− headE e = runFrame . runSpiderHostFrame $ Reflex.Class.headE e
2612− {-# INLINABLE now #-}
2613− now = runFrame . runSpiderHostFrame $ Reflex.Class.now
2614−
2615−
2616−instance HasSpiderTimeline x => Reflex.Class.MonadSample (SpiderTimeline x) (SpiderHostFrame x) where
2617− sample = SpiderHostFrame . readBehaviorUntracked . unSpiderBehavior --TODO: This can cause problems with laziness, so we should get rid of it if we can
2618−
2619−instance HasSpiderTimeline x => Reflex.Class.MonadHold (SpiderTimeline x) (SpiderHostFrame x) where
2620− {-# INLINABLE hold #-}
2621− hold v0 e = SpiderHostFrame $ fmap (SpiderBehavior . behaviorHoldIdentity) $ Reflex.Spider.Internal.hold v0 $ coerce $ unSpiderEvent e
2622− {-# INLINABLE holdDyn #-}
2623− holdDyn v0 e = SpiderHostFrame $ fmap (SpiderDynamic . dynamicHoldIdentity) $ Reflex.Spider.Internal.hold v0 $ coerce $ unSpiderEvent e
2624− {-# INLINABLE holdIncremental #-}
2625− holdIncremental v0 e = SpiderHostFrame $ fmap (SpiderIncremental . dynamicHold) $ Reflex.Spider.Internal.hold v0 $ unSpiderEvent e
2626− {-# INLINABLE buildDynamic #-}
2627− buildDynamic getV0 e = SpiderHostFrame $ fmap (SpiderDynamic . dynamicDynIdentity) $ Reflex.Spider.Internal.buildDynamic (coerce getV0) $ coerce $ unSpiderEvent e
2628− {-# INLINABLE headE #-}
2629− headE = R.slowHeadE
2630−-- headE (SpiderEvent e) = SpiderHostFrame $ SpiderEvent <$> Reflex.Spider.Internal.headE e
2631− {-# INLINABLE now #-}
2632− now = SpiderHostFrame Reflex.Class.now
2633−
2634−instance HasSpiderTimeline x => Reflex.Class.MonadSample (SpiderTimeline x) (SpiderHost x) where
2635− {-# INLINABLE sample #-}
2636− sample = runFrame . readBehaviorUntracked . unSpiderBehavior
2637−
2638−instance HasSpiderTimeline x => Reflex.Class.MonadSample (SpiderTimeline x) (Reflex.Spider.Internal.ReadPhase x) where
2639− {-# INLINABLE sample #-}
2640− sample = Reflex.Spider.Internal.ReadPhase . Reflex.Class.sample
2641−
2642−instance HasSpiderTimeline x => Reflex.Class.MonadHold (SpiderTimeline x) (Reflex.Spider.Internal.ReadPhase x) where
2643− {-# INLINABLE hold #-}
2644− hold v0 e = Reflex.Spider.Internal.ReadPhase $ Reflex.Class.hold v0 e
2645− {-# INLINABLE holdDyn #-}
2646− holdDyn v0 e = Reflex.Spider.Internal.ReadPhase $ Reflex.Class.holdDyn v0 e
2647− {-# INLINABLE holdIncremental #-}
2648− holdIncremental v0 e = Reflex.Spider.Internal.ReadPhase $ Reflex.Class.holdIncremental v0 e
2649− {-# INLINABLE buildDynamic #-}
2650− buildDynamic getV0 e = Reflex.Spider.Internal.ReadPhase $ Reflex.Class.buildDynamic getV0 e
2651− {-# INLINABLE headE #-}
2652− headE e = Reflex.Spider.Internal.ReadPhase $ Reflex.Class.headE e
2653− {-# INLINABLE now #-}
2654− now = Reflex.Spider.Internal.ReadPhase Reflex.Class.now
2655−
2656−--------------------------------------------------------------------------------
2657−-- Deprecated items
2658−--------------------------------------------------------------------------------
2659−
2660−-- | 'SpiderEnv' is the old name for 'SpiderTimeline'
2661−{-# DEPRECATED SpiderEnv "Use 'SpiderTimelineEnv' instead" #-}
2662−type SpiderEnv = SpiderTimeline
2663−instance HasSpiderTimeline x => Reflex.Host.Class.MonadSubscribeEvent (SpiderTimeline x) (SpiderHostFrame x) where
2664− {-# INLINABLE subscribeEvent #-}
1308+data Spider
1309+
1310+instance R.Reflex Spider where
1311+ newtype Behavior Spider a = SpiderBehavior { unSpiderBehavior :: Behavior a }
1312+ newtype Event Spider a = SpiderEvent { unSpiderEvent :: Event a }
1313+ type PullM Spider = BehaviorM
1314+ type PushM Spider = EventM
1315+ {-# INLINE never #-}
1316+ {-# INLINE constant #-}
1317+ never = SpiderEvent EventNever
1318+ constant = SpiderBehavior . BehaviorConst
1319+ push f = SpiderEvent. push f . unSpiderEvent
1320+ pull = SpiderBehavior . pull
1321+ merge = SpiderEvent . merge . (unsafeCoerce :: DMap k (R.Event Spider) -> DMap k Event)
1322+ fan e = R.EventSelector $ SpiderEvent . select (fan (unSpiderEvent e))
1323+ switch = SpiderEvent . switch . (unsafeCoerce :: Behavior (R.Event Spider a) -> Behavior (Event a)) . unSpiderBehavior
1324+ coincidence = SpiderEvent . coincidence . (unsafeCoerce :: Event (R.Event Spider a) -> Event (Event a)) . unSpiderEvent
1325+
1326+instance R.MonadSample Spider SpiderHost where
1327+ {-# INLINE sample #-}
1328+ sample = SpiderHost . readBehavior . unSpiderBehavior
1329+
1330+instance R.MonadHold Spider SpiderHost where
1331+ hold v0 = SpiderHost . liftM SpiderBehavior . runFrame . hold v0 . unSpiderEvent
1332+
1333+instance R.MonadSample Spider BehaviorM where
1334+ {-# INLINE sample #-}
1335+ sample = readBehaviorTracked . unSpiderBehavior
1336+
1337+instance R.MonadSample Spider EventM where
1338+ {-# INLINE sample #-}
1339+ sample = liftIO . readBehavior . unSpiderBehavior
1340+
1341+instance R.MonadHold Spider EventM where
1342+ {-# INLINE hold #-}
1343+ hold v0 e = SpiderBehavior <$> hold v0 (unSpiderEvent e)
1344+
1345+data RootTrigger a = forall k. GCompare k => RootTrigger (IORef [WeakSubscriber a], IORef (DMap k Identity), k a)
1346+newtype SpiderEventHandle a = SpiderEventHandle { unEventHandle :: Event a }
1347+
1348+instance R.MonadSubscribeEvent Spider SpiderHostFrame where
26651349 subscribeEvent e = SpiderHostFrame $ do
2666− --TODO: Unsubscribe eventually (manually and/or with weak ref)
2667− val <- liftIO $ newIORef Nothing
2668− subscription <- subscribe (unSpiderEvent e) $ Subscriber
2669− { subscriberPropagate = \a -> do
2670− liftIO $ writeIORef val $ Just a
2671− scheduleClear val
2672− , subscriberInvalidateHeight = \_ -> return ()
2673− , subscriberRecalculateHeight = \_ -> return ()
2674− }
2675− return $ SpiderEventHandle
2676− { spiderEventHandleSubscription = subscription
2677− , spiderEventHandleValue = val
2678− }
2679−
2680−instance HasSpiderTimeline x => Reflex.Host.Class.ReflexHost (SpiderTimeline x) where
2681− type EventTrigger (SpiderTimeline x) = RootTrigger x
2682− type EventHandle (SpiderTimeline x) = SpiderEventHandle x
2683− type HostFrame (SpiderTimeline x) = SpiderHostFrame x
2684−
2685−instance HasSpiderTimeline x => Reflex.Host.Class.MonadReadEvent (SpiderTimeline x) (Reflex.Spider.Internal.ReadPhase x) where
2686− {-# NOINLINE readEvent #-}
2687− readEvent h = Reflex.Spider.Internal.ReadPhase $ fmap (fmap return) $ liftIO $ do
2688− result <- readIORef $ spiderEventHandleValue h
2689− touch h
2690− return result
2691−
2692−instance HasSpiderTimeline x => Reflex.Host.Class.MonadReflexCreateTrigger (SpiderTimeline x) (SpiderHost x) where
2693− newEventWithTrigger = SpiderHost . fmap SpiderEvent . newEventWithTriggerIO
2694− newFanEventWithTrigger f = SpiderHost $ do
2695− es <- newFanEventWithTriggerIO f
2696− return $ Reflex.Class.EventSelector $ SpiderEvent . Reflex.Spider.Internal.select es
2697−
2698−instance HasSpiderTimeline x => Reflex.Host.Class.MonadReflexCreateTrigger (SpiderTimeline x) (SpiderHostFrame x) where
2699− newEventWithTrigger = SpiderHostFrame . EventM . liftIO . fmap SpiderEvent . newEventWithTriggerIO
2700− newFanEventWithTrigger f = SpiderHostFrame $ EventM $ liftIO $ do
2701− es <- newFanEventWithTriggerIO f
2702− return $ Reflex.Class.EventSelector $ SpiderEvent . Reflex.Spider.Internal.select es
2703−
2704−instance HasSpiderTimeline x => Reflex.Host.Class.MonadSubscribeEvent (SpiderTimeline x) (SpiderHost x) where
2705− {-# INLINABLE subscribeEvent #-}
2706− subscribeEvent = runFrame . runSpiderHostFrame . Reflex.Host.Class.subscribeEvent
2707−
2708−instance HasSpiderTimeline x => Reflex.Host.Class.MonadReflexHost (SpiderTimeline x) (SpiderHost x) where
2709− type ReadPhase (SpiderHost x) = Reflex.Spider.Internal.ReadPhase x
2710− fireEventsAndRead es (Reflex.Spider.Internal.ReadPhase a) = run es a
2711− runHostFrame = runFrame . runSpiderHostFrame
2712−
2713−unsafeNewSpiderTimelineEnv :: forall x. IO (SpiderTimelineEnv x)
2714−unsafeNewSpiderTimelineEnv = do
2715− lock <- newMVar ()
2716− env <- newEventEnv
2717−#ifdef DEBUG
2718− depthRef <- newIORef 0
2719−#endif
2720− return $ STE $ SpiderTimelineEnv
2721− { _spiderTimeline_lock = lock
2722− , _spiderTimeline_eventEnv = env
2723−#ifdef DEBUG
2724− , _spiderTimeline_depth = depthRef
2725−#endif
2726− }
2727−
2728−-- | Create a new SpiderTimelineEnv
2729−newSpiderTimeline :: IO (Some SpiderTimelineEnv)
2730−newSpiderTimeline = withSpiderTimeline (pure . Some)
2731−
2732−data LocalSpiderTimeline (x :: Type) s
2733−
2734−instance Reifies s (SpiderTimelineEnv x) =>
2735− HasSpiderTimeline (LocalSpiderTimeline x s) where
2736− spiderTimeline = localSpiderTimeline Proxy $ reflect (Proxy :: Proxy s)
2737−
2738−localSpiderTimeline
2739− :: proxy s
2740− -> SpiderTimelineEnv x
2741− -> SpiderTimelineEnv (LocalSpiderTimeline x s)
2742−localSpiderTimeline _ = coerce
2743−
2744−-- | Pass a new timeline to the given function.
2745−withSpiderTimeline :: (forall x. HasSpiderTimeline x => SpiderTimelineEnv x -> IO r) -> IO r
2746−withSpiderTimeline k = do
2747− env <- unsafeNewSpiderTimelineEnv
2748− reify env $ \s -> k $ localSpiderTimeline s env
2749−
2750−newtype SpiderPullM (x :: Type) a = SpiderPullM (BehaviorM x a) deriving (Functor, Applicative, Monad, MonadIO, MonadFix)
2751−
2752−type ComputeM = EventM
2753−
2754−newtype SpiderPushM (x :: Type) a = SpiderPushM (ComputeM x a) deriving (Functor, Applicative, Monad, MonadIO, MonadFix)
2755−
2756−instance HasSpiderTimeline x => R.Reflex (SpiderTimeline x) where
2757− {-# SPECIALIZE instance R.Reflex (SpiderTimeline Global) #-}
2758− newtype Behavior (SpiderTimeline x) a = SpiderBehavior { unSpiderBehavior :: Behavior x a }
2759− newtype Event (SpiderTimeline x) a = SpiderEvent { unSpiderEvent :: Event x a }
2760− newtype Dynamic (SpiderTimeline x) a = SpiderDynamic { unSpiderDynamic :: DynamicS x (Identity a) } -- deriving (Functor, Applicative, Monad)
2761− newtype Incremental (SpiderTimeline x) p = SpiderIncremental { unSpiderIncremental :: DynamicS x p }
2762− type PullM (SpiderTimeline x) = SpiderPullM x
2763− type PushM (SpiderTimeline x) = SpiderPushM x
2764− {-# INLINABLE never #-}
2765− never = SpiderEvent eventNever
2766− {-# INLINABLE constant #-}
2767− constant = SpiderBehavior . behaviorConst
2768− {-# INLINE push #-}
2769− push f = SpiderEvent . push (coerce f) . unSpiderEvent
2770− {-# INLINE pushCheap #-}
2771− pushCheap f = SpiderEvent . pushCheap (coerce f) . unSpiderEvent
2772− {-# INLINABLE pull #-}
2773− pull = SpiderBehavior . pull . coerce
2774− {-# INLINABLE fanG #-}
2775− fanG e = R.EventSelectorG $ SpiderEvent . selectG (fanG (unSpiderEvent e))
2776− {-# INLINABLE mergeG #-}
2777− mergeG
2778− :: forall k2 (k :: k2 -> *) q (v :: k2 -> *). GCompare k
2779− => (forall a. q a -> R.Event (SpiderTimeline x) (v a))
2780− -> DMap k q
2781− -> R.Event (SpiderTimeline x) (DMap k v)
2782− mergeG nt = SpiderEvent . mergeG (unSpiderEvent #. nt) . dynamicConst
2783− {-# INLINABLE switch #-}
2784− switch = SpiderEvent . switch . (coerce :: Behavior x (R.Event (SpiderTimeline x) a) -> Behavior x (Event x a)) . unSpiderBehavior
2785− {-# INLINABLE coincidence #-}
2786− coincidence = SpiderEvent . coincidence . (coerce :: Event x (R.Event (SpiderTimeline x) a) -> Event x (Event x a)) . unSpiderEvent
2787− {-# INLINABLE current #-}
2788− current = SpiderBehavior . dynamicCurrent . unSpiderDynamic
2789− {-# INLINABLE updated #-}
2790− updated = SpiderEvent #. dynamicUpdated .# fmap coerce . unSpiderDynamic
2791− {-# INLINABLE unsafeBuildDynamic #-}
2792− unsafeBuildDynamic readV0 v' = SpiderDynamic $ dynamicDynIdentity $ unsafeBuildDynamic (coerce readV0) $ coerce $ unSpiderEvent v'
2793− {-# INLINABLE unsafeBuildIncremental #-}
2794− unsafeBuildIncremental readV0 dv = SpiderIncremental $ dynamicDyn $ unsafeBuildDynamic (coerce readV0) $ unSpiderEvent dv
2795− {-# INLINABLE mergeIncrementalG #-}
2796− mergeIncrementalG nt = SpiderEvent #. mergeG (coerce #. nt) .# unSpiderIncremental
2797− {-# INLINABLE mergeIncrementalWithMoveG #-}
2798− mergeIncrementalWithMoveG nt = SpiderEvent #. mergeWithMove (coerce #. nt) .# unSpiderIncremental
2799− {-# INLINABLE currentIncremental #-}
2800− currentIncremental = SpiderBehavior . dynamicCurrent . unSpiderIncremental
2801− {-# INLINABLE updatedIncremental #-}
2802− updatedIncremental = SpiderEvent . dynamicUpdated . unSpiderIncremental
2803− {-# INLINABLE incrementalToDynamic #-}
2804− incrementalToDynamic (SpiderIncremental i) = SpiderDynamic $ dynamicDynIdentity $ unsafeBuildDynamic (readBehaviorUntracked $ dynamicCurrent i) $ flip push (dynamicUpdated i) $ \p -> do
2805− c <- readBehaviorUntracked $ dynamicCurrent i
2806− return $ Identity <$> apply p c --TODO: Avoid the redundant 'apply'
2807− eventCoercion Coercion = Coercion
2808− behaviorCoercion Coercion = Coercion
2809− dynamicCoercion Coercion = Coercion
2810− incrementalCoercion Coercion Coercion = Coercion
2811− {-# INLINABLE mergeIntIncremental #-}
2812− mergeIntIncremental = SpiderEvent . mergeInt . coerce
2813− {-# INLINABLE fanInt #-}
2814− fanInt e = R.EventSelectorInt $ SpiderEvent . selectInt (fanInt (unSpiderEvent e))
2815−
2816−data RootTrigger x a = forall k. GCompare k => RootTrigger (WeakBag (Subscriber x a), IORef (DMap k Identity), k a)
2817−
2818−data SpiderEventHandle x a = SpiderEventHandle
2819− { spiderEventHandleSubscription :: EventSubscription x
2820− , spiderEventHandleValue :: IORef (Maybe a)
2821− }
2822−
2823−instance MonadRef (EventM x) where
2824− type Ref (EventM x) = Ref IO
2825− {-# INLINABLE newRef #-}
2826− {-# INLINABLE readRef #-}
2827− {-# INLINABLE writeRef #-}
1350+ _ <- getEventSubscribed $ unSpiderEvent e --TODO: The result of this should actually be used
1351+ return $ SpiderEventHandle (unSpiderEvent e)
1352+
1353+instance R.ReflexHost Spider where
1354+ type EventTrigger Spider = RootTrigger
1355+ type EventHandle Spider = SpiderEventHandle
1356+ type HostFrame Spider = SpiderHostFrame
1357+
1358+instance R.MonadReadEvent Spider ReadPhase where
1359+ {-# INLINE readEvent #-}
1360+ readEvent = ReadPhase . liftM (fmap return) . readEvent . unEventHandle
1361+
1362+instance MonadRef EventM where
1363+ type Ref EventM = Ref IO
1364+ {-# INLINE newRef #-}
1365+ {-# INLINE readRef #-}
1366+ {-# INLINE writeRef #-}
28281367 newRef = liftIO . newRef
28291368 readRef = liftIO . readRef
28301369 writeRef r a = liftIO $ writeRef r a
28311370
2832−instance MonadAtomicRef (EventM x) where
2833− {-# INLINABLE atomicModifyRef #-}
1371+instance MonadAtomicRef EventM where
1372+ {-# INLINE atomicModifyRef #-}
28341373 atomicModifyRef r f = liftIO $ atomicModifyRef r f
28351374
2836−-- | The monad for actions that manipulate a Spider timeline identified by @x@
2837−newtype SpiderHost (x :: Type) a = SpiderHost { unSpiderHost :: IO a } deriving (Functor, Applicative, MonadFix, MonadIO, MonadException, MonadAsyncException)
2838−
2839−instance Monad (SpiderHost x) where
2840− {-# INLINABLE (>>=) #-}
2841− SpiderHost x >>= f = SpiderHost $ x >>= unSpiderHost . f
2842− {-# INLINABLE (>>) #-}
2843− SpiderHost x >> SpiderHost y = SpiderHost $ x >> y
2844− {-# INLINABLE return #-}
2845− return x = SpiderHost $ return x
2846−#if !MIN_VERSION_base(4,13,0)
2847− {-# INLINABLE fail #-}
2848− fail = MonadFail.fail
2849−#endif
1375+newtype SpiderHost a = SpiderHost { runSpiderHost :: IO a } deriving (Functor, Applicative, Monad, MonadFix, MonadIO, MonadException, MonadAsyncException)
28501376
2851−instance MonadFail (SpiderHost x) where
2852− {-# INLINABLE fail #-}
2853− fail s = SpiderHost $ MonadFail.fail s
2854−
2855−-- | Run an action affecting the global Spider timeline; this will be guarded by
2856−-- a mutex for that timeline
2857−runSpiderHost :: SpiderHost Global a -> IO a
2858−runSpiderHost (SpiderHost a) = a
2859−
2860−-- | Run an action affecting a given Spider timeline; this will be guarded by a
2861−-- mutex for that timeline
2862−runSpiderHostForTimeline :: SpiderHost x a -> SpiderTimelineEnv x -> IO a
2863−runSpiderHostForTimeline (SpiderHost a) _ = a
2864−
2865−newtype SpiderHostFrame (x :: Type) a = SpiderHostFrame { runSpiderHostFrame :: EventM x a }
2866− deriving (Functor, Applicative, MonadFix, MonadIO, MonadException, MonadAsyncException)
2867−
2868−instance Monad (SpiderHostFrame x) where
2869− {-# INLINABLE (>>=) #-}
2870− SpiderHostFrame x >>= f = SpiderHostFrame $ x >>= runSpiderHostFrame . f
2871− {-# INLINABLE (>>) #-}
2872− SpiderHostFrame x >> SpiderHostFrame y = SpiderHostFrame $ x >> y
2873− {-# INLINABLE return #-}
2874− return x = SpiderHostFrame $ return x
2875−#if !MIN_VERSION_base(4,13,0)
2876− {-# INLINABLE fail #-}
2877− fail s = SpiderHostFrame $ fail s
2878−#endif
1377+newtype SpiderHostFrame a = SpiderHostFrame { runSpiderHostFrame :: EventM a } deriving (Functor, Applicative, Monad, MonadFix, MonadIO, MonadException, MonadAsyncException)
28791378
2880−instance NotReady (SpiderTimeline x) (SpiderHostFrame x) where
2881− notReadyUntil _ = pure ()
2882− notReady = pure ()
1379+instance R.MonadSample Spider SpiderHostFrame where
1380+ sample = SpiderHostFrame . R.sample --TODO: This can cause problems with laziness, so we should get rid of it if we can
1381+
1382+instance R.MonadHold Spider SpiderHostFrame where
1383+ {-# INLINE hold #-}
1384+ hold v0 e = SpiderHostFrame $ R.hold v0 e
28831385
2884−newEventWithTriggerIO :: forall x a. HasSpiderTimeline x => (RootTrigger x a -> IO (IO ())) -> IO (Event x a)
1386+newEventWithTriggerIO :: forall a. (RootTrigger a -> IO (IO ())) -> IO (Event a)
28851387newEventWithTriggerIO f = do
28861388 es <- newFanEventWithTriggerIO $ \Refl -> f
28871389 return $ select es Refl
28881390
2889−newFanEventWithTriggerIO :: (HasSpiderTimeline x, GCompare k) => (forall a. k a -> RootTrigger x a -> IO (IO ())) -> IO (EventSelector x k)
1391+newFanEventWithTriggerIO :: GCompare k => (forall a. k a -> RootTrigger a -> IO (IO ())) -> IO (EventSelector k)
28901392newFanEventWithTriggerIO f = do
28911393 occRef <- newIORef DMap.empty
28921394 subscribedRef <- newIORef DMap.empty
@@ -2895,36 +1397,46 @@ newFanEventWithTriggerIO f = do
28951397 , rootSubscribed = subscribedRef
28961398 , rootInit = f
28971399 }
2898− return $ EventSelector $ \k -> eventRoot k r
1400+ return $ EventSelector $ \k -> EventRoot k r
1401+
1402+instance R.MonadReflexCreateTrigger Spider SpiderHost where
1403+ newEventWithTrigger = SpiderHost . liftM SpiderEvent . newEventWithTriggerIO
1404+ newFanEventWithTrigger f = SpiderHost $ do
1405+ es <- newFanEventWithTriggerIO f
1406+ return $ R.EventSelector $ SpiderEvent . select es
28991407
2900−newtype ReadPhase x a = ReadPhase (ResultM x a) deriving (Functor, Applicative, Monad, MonadFix)
1408+instance R.MonadReflexCreateTrigger Spider SpiderHostFrame where
1409+ newEventWithTrigger = SpiderHostFrame . EventM . liftIO . liftM SpiderEvent . newEventWithTriggerIO
1410+ newFanEventWithTrigger f = SpiderHostFrame $ EventM $ liftIO $ do
1411+ es <- newFanEventWithTriggerIO f
1412+ return $ R.EventSelector $ SpiderEvent . select es
1413+
1414+instance R.MonadSubscribeEvent Spider SpiderHost where
1415+ subscribeEvent e = SpiderHost $ do
1416+ _ <- runFrame $ getEventSubscribed $ unSpiderEvent e --TODO: The result of this should actually be used
1417+ return $ SpiderEventHandle (unSpiderEvent e)
1418+
1419+newtype ReadPhase a = ReadPhase { runReadPhase :: ResultM a } deriving (Functor, Applicative, Monad, MonadFix, R.MonadSample Spider, R.MonadHold Spider)
29011420
2902−instance MonadRef (SpiderHost x) where
2903− type Ref (SpiderHost x) = Ref IO
1421+instance R.MonadReflexHost Spider SpiderHost where
1422+ type ReadPhase SpiderHost = ReadPhase
1423+ fireEventsAndRead es (ReadPhase a) = SpiderHost $ run es a
1424+ runHostFrame = SpiderHost . runFrame . runSpiderHostFrame
1425+
1426+instance MonadRef SpiderHost where
1427+ type Ref SpiderHost = Ref IO
29041428 newRef = SpiderHost . newRef
29051429 readRef = SpiderHost . readRef
29061430 writeRef r = SpiderHost . writeRef r
29071431
2908−instance MonadAtomicRef (SpiderHost x) where
1432+instance MonadAtomicRef SpiderHost where
29091433 atomicModifyRef r = SpiderHost . atomicModifyRef r
29101434
2911−instance MonadRef (SpiderHostFrame x) where
2912− type Ref (SpiderHostFrame x) = Ref IO
1435+instance MonadRef SpiderHostFrame where
1436+ type Ref SpiderHostFrame = Ref IO
29131437 newRef = SpiderHostFrame . newRef
29141438 readRef = SpiderHostFrame . readRef
29151439 writeRef r = SpiderHostFrame . writeRef r
29161440
2917−instance MonadAtomicRef (SpiderHostFrame x) where
1441+instance MonadAtomicRef SpiderHostFrame where
29181442 atomicModifyRef r = SpiderHostFrame . atomicModifyRef r
2919−
2920−instance PrimMonad (SpiderHostFrame x) where
2921− type PrimState (SpiderHostFrame x) = PrimState IO
2922− primitive = SpiderHostFrame . EventM . primitive
2923−
2924−instance NotReady (SpiderTimeline x) (SpiderHost x) where
2925− notReadyUntil _ = return ()
2926− notReady = return ()
2927−
2928−instance HasSpiderTimeline x => NotReady (SpiderTimeline x) (PerformEventT (SpiderTimeline x) (SpiderHost x)) where
2929− notReadyUntil _ = return ()
2930− notReady = return ()