@@ -1,2641 +0,0 @@
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 MultiParamTypeClasses #-}
13−{-# LANGUAGE MultiWayIf #-}
14−{-# LANGUAGE RankNTypes #-}
15−{-# LANGUAGE RoleAnnotations #-}
16−{-# LANGUAGE ScopedTypeVariables #-}
17−{-# LANGUAGE TypeFamilies #-}
18−{-# LANGUAGE TypeOperators #-}
19−{-# LANGUAGE UndecidableInstances #-}
20−#ifdef USE_REFLEX_OPTIMIZER
21−{-# OPTIONS_GHC -fplugin=Reflex.Optimizer #-}
22−#endif
23−-- | This module is the implementation of the 'Spider' 'Reflex' engine. It uses
24−-- a graph traversal algorithm to propagate 'Event's and 'Behavior's.
25−module Reflex.Spider.Internal (module Reflex.Spider.Internal) where
26−
27−#if MIN_VERSION_base(4,10,0)
28−import Control.Applicative (liftA2)
29−#endif
30−import Control.Concurrent
31−import Control.Exception
32−import Control.Monad hiding (forM, forM_, mapM, mapM_)
33−import Control.Monad.Exception
34−import Control.Monad.Identity hiding (forM, forM_, mapM, mapM_)
35−import Control.Monad.Primitive
36−import Control.Monad.Reader hiding (forM, forM_, mapM, mapM_)
37−import Control.Monad.Ref
38−import Data.Align
39−import Data.Coerce
40−import Data.Dependent.Map (DMap, DSum (..))
41−import qualified Data.Dependent.Map as DMap
42−import Data.FastMutableIntMap (FastMutableIntMap, PatchIntMap (..))
43−import qualified Data.FastMutableIntMap as FastMutableIntMap
44−import Data.Foldable hiding (concat, elem, sequence_)
45−import Data.Functor.Constant
46−import Data.Functor.Misc
47−import Data.Functor.Product
48−import Data.GADT.Compare
49−import Data.IntMap.Strict (IntMap)
50−import qualified Data.IntMap.Strict as IntMap
51−import Data.IORef
52−import Data.Maybe hiding (mapMaybe)
53−import Data.Monoid ((<>))
54−import Data.Proxy
55−import Data.These
56−import Data.Traversable
57−import Data.Witherable (Filterable, mapMaybe)
58−import GHC.Exts
59−import GHC.IORef (IORef (..))
60−import GHC.Stack
61−import Reflex.FastWeak
62−import System.IO.Unsafe
63−import System.Mem.Weak
64−import Unsafe.Coerce
65−
66−#ifdef DEBUG_CYCLES
67−import Control.Monad.State hiding (forM, forM_, mapM, mapM_, sequence)
68−import Data.List.NonEmpty (NonEmpty (..), nonEmpty)
69−import qualified Data.List.NonEmpty as NonEmpty
70−import Data.Monoid (mempty)
71−import Data.Tree (Forest, Tree (..), drawForest)
72−#endif
73−
74−import Data.FastWeakBag (FastWeakBag)
75−import qualified Data.FastWeakBag as FastWeakBag
76−import Data.Reflection
77−import Data.Some (Some)
78−import qualified Data.Some as Some
79−import Data.Type.Coercion
80−import Data.WeakBag (WeakBag, WeakBagTicket, _weakBag_children)
81−import qualified Data.WeakBag as WeakBag
82−import qualified Reflex.Class
83−import qualified Reflex.Class as R
84−import qualified Reflex.Host.Class
85−import Reflex.NotReady.Class
86−import Reflex.Patch
87−import qualified Reflex.Patch.DMapWithMove as PatchDMapWithMove
88−
89−#ifdef DEBUG_TRACE_EVENTS
90−import qualified Data.ByteString.Char8 as BS8
91−import System.IO (stderr)
92−#endif
93−
94−#ifdef DEBUG_TRACE_EVENTS
95−
96−withStackOneLine :: (BS8.ByteString -> a) -> a
97−withStackOneLine expr = unsafePerformIO $ do
98− stack <- currentCallStack
99− return (expr (BS8.pack (unwords (reverse stack))))
100−
101−#endif
102−
103−debugPropagate :: Bool
104−
105−debugInvalidateHeight :: Bool
106−
107−debugInvalidate :: Bool
108−
109−#ifdef DEBUG
110−
111−#define DEBUG_NODEIDS
112−
113−debugPropagate = True
114−
115−debugInvalidateHeight = False
116−
117−debugInvalidate = True
118−
119−class HasNodeId a where
120− getNodeId :: a -> Int
121−
122−instance HasNodeId (Hold x p a) where
123− getNodeId = holdNodeId
124−
125−instance HasNodeId (PushSubscribed x a b) where
126− getNodeId = pushSubscribedNodeId
127−
128−instance HasNodeId (SwitchSubscribed x a) where
129− getNodeId = switchSubscribedNodeId
130−
131−instance HasNodeId (FanSubscribed x a) where
132− getNodeId = fanSubscribedNodeId
133−
134−instance HasNodeId (CoincidenceSubscribed x a) where
135− getNodeId = coincidenceSubscribedNodeId
136−
137−instance HasNodeId (RootSubscribed x a) where
138− getNodeId = rootSubscribedNodeId
139−
140−instance HasNodeId (Pull x a) where
141− getNodeId = pullNodeId
142−
143−{-# INLINE showNodeId #-}
144−showNodeId :: HasNodeId a => a -> String
145−showNodeId = ("#"<>) . show . getNodeId
146−
147−showSubscriberType :: Subscriber x a -> String
148−showSubscriberType = \case
149− SubscriberPush _ _ -> "SubscriberPush"
150− SubscriberMerge _ _ -> "SubscriberMerge"
151− SubscriberFan _ -> "SubscriberFan"
152− SubscriberMergeChange _ -> "SubscriberMergeChange"
153− SubscriberHold _ -> "SubscriberHold"
154− SubscriberHoldIdentity _ -> "SubscriberHoldIdentity"
155− SubscriberSwitch _ -> "SubscriberSwitch"
156− SubscriberCoincidenceOuter _ -> "SubscriberCoincidenceOuter"
157− SubscriberCoincidenceInner _ -> "SubscriberCoincidenceInner"
158− SubscriberHandle -> "SubscriberHandle"
159−
160−showEventType :: Event x a -> String
161−showEventType = \case
162− EventRoot _ _ -> "EventRoot"
163− EventNever -> "EventNever"
164− EventPush _ -> "EventPush"
165− EventMerge _ -> "EventMerge"
166− EventFan _ _ -> "EventFan"
167− EventSwitch _ -> "EventSwitch"
168− EventCoincidence _ -> "EventCoincidence"
169− EventHold _ -> "EventHold"
170− EventDyn _ -> "EventDyn"
171− EventHoldIdentity _ -> "EventHoldIdentity"
172− EventDynIdentity _ -> "EventDynIdentity"
173−
174−#else
175−
176−debugPropagate = False
177−
178−debugInvalidateHeight = False
179−
180−debugInvalidate = False
181−
182−-- This must be inline, or error messages will cause memory leaks due to retaining the node in question
183−{-# INLINE showNodeId #-}
184−showNodeId :: a -> String
185−showNodeId _ = ""
186−
187−#endif
188−
189−#ifdef DEBUG_NODEIDS
190−{-# NOINLINE nextNodeIdRef #-}
191−nextNodeIdRef :: IORef Int
192−nextNodeIdRef = unsafePerformIO $ newIORef 1
193−
194−newNodeId :: IO Int
195−newNodeId = atomicModifyIORef' nextNodeIdRef $ \n -> (succ n, n)
196−
197−{-# NOINLINE unsafeNodeId #-}
198−unsafeNodeId :: a -> Int
199−unsafeNodeId a = unsafePerformIO $ do
200− touch a
201− newNodeId
202−#endif
203−
204−--------------------------------------------------------------------------------
205−-- EventSubscription
206−--------------------------------------------------------------------------------
207−
208−--NB: Once you subscribe to an Event, you must always hold on the the WHOLE EventSubscription you get back
209−-- If you do not retain the subscription, you may be prematurely unsubscribed from the parent event.
210−data EventSubscription x = EventSubscription
211− { _eventSubscription_unsubscribe :: !(IO ())
212− , _eventSubscription_subscribed :: {-# UNPACK #-} !(EventSubscribed x)
213− }
214−
215−unsubscribe :: EventSubscription x -> IO ()
216−unsubscribe (EventSubscription u _) = u
217−
218−--------------------------------------------------------------------------------
219−-- Event
220−--------------------------------------------------------------------------------
221−
222−newtype Event x a = Event { unEvent :: Subscriber x a -> EventM x (EventSubscription x, Maybe a) }
223−
224−{-# INLINE subscribeAndRead #-}
225−subscribeAndRead :: Event x a -> Subscriber x a -> EventM x (EventSubscription x, Maybe a)
226−subscribeAndRead = unEvent
227−
228−{-# RULES
229−"cacheEvent/cacheEvent" forall e. cacheEvent (cacheEvent e) = cacheEvent e
230−"cacheEvent/pushCheap" forall f e. pushCheap f (cacheEvent e) = cacheEvent (pushCheap f e)
231−"hold/cacheEvent" forall f e. hold f (cacheEvent e) = hold f e
232− #-}
233−
234−-- | Construct an 'Event' equivalent to that constructed by 'push', but with no
235−-- caching; if the computation function is very cheap, this is (much) more
236−-- efficient than 'push'
237−{-# INLINE [1] pushCheap #-}
238−pushCheap :: (a -> ComputeM x (Maybe b)) -> Event x a -> Event x b
239−pushCheap !f e = Event $ \sub -> do
240− (subscription, occ) <- subscribeAndRead e $ sub
241− { subscriberPropagate = \a -> do
242− mb <- f a
243− mapM_ (subscriberPropagate sub) mb
244− }
245− occ' <- join <$> mapM f occ
246− return (subscription, occ')
247−
248−-- | A subscriber that never triggers other 'Event's
249−{-# INLINE terminalSubscriber #-}
250−terminalSubscriber :: (a -> EventM x ()) -> Subscriber x a
251−terminalSubscriber p = Subscriber
252− { subscriberPropagate = p
253− , subscriberInvalidateHeight = \_ -> return ()
254− , subscriberRecalculateHeight = \_ -> return ()
255− }
256−
257−-- | Subscribe to an Event only for the duration of one occurrence
258−{-# INLINE subscribeAndReadHead #-}
259−subscribeAndReadHead :: Event x a -> Subscriber x a -> EventM x (EventSubscription x, Maybe a)
260−subscribeAndReadHead e sub = do
261− subscriptionRef <- liftIO $ newIORef $ error "subscribeAndReadHead: not initialized"
262− (subscription, occ) <- subscribeAndRead e $ sub
263− { subscriberPropagate = \a -> do
264− liftIO $ unsubscribe =<< readIORef subscriptionRef
265− subscriberPropagate sub a
266− }
267− liftIO $ case occ of
268− Nothing -> writeIORef subscriptionRef $! subscription
269− Just _ -> unsubscribe subscription
270− return (subscription, occ)
271−
272−--TODO: Make this lazy in its input event
273−headE :: (MonadIO m, Defer (SomeMergeInit x) m) => Event x a -> m (Event x a)
274−headE originalE = do
275− parent <- liftIO $ newIORef $ Just originalE
276− defer $ SomeMergeInit $ do --TODO: Rename SomeMergeInit appropriately
277− let clearParent = liftIO $ writeIORef parent Nothing
278− (_, occ) <- subscribeAndReadHead originalE $ terminalSubscriber $ \_ -> clearParent
279− when (isJust occ) clearParent
280− return $ Event $ \sub -> do
281− liftIO (readIORef parent) >>= \case
282− Nothing -> return (EventSubscription (return ()) $ EventSubscribed zeroRef $ toAny (), Nothing)
283− Just e -> subscribeAndReadHead e sub
284−
285−data CacheSubscribed x a
286− = CacheSubscribed { _cacheSubscribed_subscribers :: {-# UNPACK #-} !(FastWeakBag (Subscriber x a))
287− , _cacheSubscribed_parent :: {-# UNPACK #-} !(EventSubscription x)
288− , _cacheSubscribed_occurrence :: {-# UNPACK #-} !(IORef (Maybe a))
289− }
290−
291−-- | Construct an 'Event' whose value is guaranteed not to be recomputed
292−-- repeatedly
293−--
294−--TODO: Try a caching strategy where we subscribe directly to the parent when
295−--there's only one subscriber, and then build our own FastWeakBag only when a second
296−--subscriber joins
297−{-# NOINLINE [0] cacheEvent #-}
298−cacheEvent :: forall x a. HasSpiderTimeline x => Event x a -> Event x a
299−cacheEvent e =
300−#ifdef DEBUG_TRACE_EVENTS
301− withStackOneLine $ \callSite -> Event $
302−#else
303− Event $
304−#endif
305− let mSubscribedRef :: IORef (FastWeak (CacheSubscribed x a))
306− !mSubscribedRef = unsafeNewIORef e emptyFastWeak
307− in \sub -> {-# SCC "cacheEvent" #-} do
308−#ifdef DEBUG_TRACE_EVENTS
309− unless (BS8.null callSite) $ liftIO $ BS8.hPutStrLn stderr callSite
310−#endif
311− subscribedTicket <- liftIO (readIORef mSubscribedRef >>= getFastWeakTicket) >>= \case
312− Just subscribedTicket -> return subscribedTicket
313− Nothing -> do
314− subscribers <- liftIO FastWeakBag.empty
315− occRef <- liftIO $ newIORef Nothing -- This should never be read prior to being set below
316− (parentSub, occ) <- subscribeAndRead e $ Subscriber
317− { subscriberPropagate = \a -> do
318− liftIO $ writeIORef occRef $ Just a
319− scheduleClear occRef
320− propagateFast a subscribers
321− , subscriberInvalidateHeight = \old -> do
322− FastWeakBag.traverse subscribers $ invalidateSubscriberHeight old
323− , subscriberRecalculateHeight = \new -> do
324− FastWeakBag.traverse subscribers $ recalculateSubscriberHeight new
325− }
326− when (isJust occ) $ do
327− liftIO $ writeIORef occRef occ -- Set the initial value of occRef; we don't need to do this if occ is Nothing
328− scheduleClear occRef
329− let !subscribed = CacheSubscribed
330− { _cacheSubscribed_subscribers = subscribers
331− , _cacheSubscribed_parent = parentSub
332− , _cacheSubscribed_occurrence = occRef
333− }
334− subscribedTicket <- liftIO $ mkFastWeakTicket subscribed
335− liftIO $ writeIORef mSubscribedRef =<< getFastWeakTicketWeak subscribedTicket
336− return subscribedTicket
337− liftIO $ do
338− subscribed <- getFastWeakTicketValue subscribedTicket
339− ticket <- FastWeakBag.insert sub $ _cacheSubscribed_subscribers subscribed
340− occ <- readIORef $ _cacheSubscribed_occurrence subscribed
341− let es = EventSubscription
342− { _eventSubscription_unsubscribe = do
343− FastWeakBag.remove ticket
344− isEmpty <- FastWeakBag.isEmpty $ _cacheSubscribed_subscribers subscribed
345− when isEmpty $ do
346− writeIORef mSubscribedRef emptyFastWeak
347− unsubscribe $ _cacheSubscribed_parent subscribed
348− touch ticket
349− touch subscribedTicket
350− , _eventSubscription_subscribed = EventSubscribed
351− { eventSubscribedHeightRef = eventSubscribedHeightRef $ _eventSubscription_subscribed $ _cacheSubscribed_parent subscribed
352− , eventSubscribedRetained = toAny subscribedTicket
353− }
354− }
355− return (es, occ)
356−
357−subscribe :: Event x a -> Subscriber x a -> EventM x (EventSubscription x)
358−subscribe e s = fst <$> subscribeAndRead e s
359−
360−{-# INLINE wrap #-}
361−wrap :: MonadIO m => (t -> EventSubscribed x) -> (Subscriber x a -> m (WeakBagTicket, t, Maybe a)) -> Subscriber x a -> m (EventSubscription x, Maybe a)
362−wrap tag getSpecificSubscribed sub = do
363− (sln, subd, occ) <- getSpecificSubscribed sub
364− let es = tag subd
365− return (EventSubscription (WeakBag.remove sln >> touch sln) es, occ)
366−
367−eventRoot :: GCompare k => k a -> Root x k -> Event x a
368−eventRoot !k !r = Event $ wrap eventSubscribedRoot $ liftIO . getRootSubscribed k r
369−
370−eventNever :: Event x a
371−eventNever = Event $ \_ -> return (EventSubscription (return ()) eventSubscribedNever, Nothing)
372−
373−eventFan :: (GCompare k, HasSpiderTimeline x) => k a -> Fan x k -> Event x a
374−eventFan !k !f = Event $ wrap eventSubscribedFan $ getFanSubscribed k f
375−
376−eventSwitch :: HasSpiderTimeline x => Switch x a -> Event x a
377−eventSwitch !s = Event $ wrap eventSubscribedSwitch $ getSwitchSubscribed s
378−
379−eventCoincidence :: HasSpiderTimeline x => Coincidence x a -> Event x a
380−eventCoincidence !c = Event $ wrap eventSubscribedCoincidence $ getCoincidenceSubscribed c
381−
382−eventHold :: Hold x p -> Event x p
383−eventHold !h = Event $ subscribeHoldEvent h
384−
385−eventDyn :: (HasSpiderTimeline x, Patch p) => Dyn x p -> Event x p
386−eventDyn !j = Event $ \sub -> getDynHold j >>= \h -> subscribeHoldEvent h sub
387−
388−{-# INLINE subscribeCoincidenceInner #-}
389−subscribeCoincidenceInner :: HasSpiderTimeline x => Event x a -> Height -> CoincidenceSubscribed x a -> EventM x (Maybe a, Height, EventSubscribed x)
390−subscribeCoincidenceInner inner outerHeight subscribedUnsafe = do
391− subInner <- liftIO $ newSubscriberCoincidenceInner subscribedUnsafe
392− (subscription@(EventSubscription _ innerSubd), innerOcc) <- subscribeAndRead inner subInner
393− innerHeight <- liftIO $ getEventSubscribedHeight innerSubd
394− let height = max innerHeight outerHeight
395− defer $ SomeResetCoincidence subscription $ if height > outerHeight then Just subscribedUnsafe else Nothing
396− return (innerOcc, height, innerSubd)
397−
398−--------------------------------------------------------------------------------
399−-- Subscriber
400−--------------------------------------------------------------------------------
401−
402−data Subscriber x a = Subscriber
403− { subscriberPropagate :: !(a -> EventM x ())
404− , subscriberInvalidateHeight :: !(Height -> IO ())
405− , subscriberRecalculateHeight :: !(Height -> IO ())
406− }
407−
408−--TODO: Move this comment to WeakBag
409−-- These function are constructor functions that are marked NOINLINE so they are
410−-- opaque to GHC. If we do not do this, then GHC will sometimes fuse the constructor away
411−-- so any weak references that are attached to the constructors will have their
412−-- finalizer run. Using the opaque constructor, does not see the
413−-- constructor application, so it behaves like an IORef and cannot be fused away.
414−--
415−-- The result is also evaluated to WHNF, since forcing a thunk invalidates
416−-- the weak pointer to it in some cases.
417−
418−newSubscriberHold :: (HasSpiderTimeline x, Patch p) => Hold x p -> IO (Subscriber x p)
419−newSubscriberHold h = return $ Subscriber
420− { subscriberPropagate = {-# SCC "traverseHold" #-} propagateSubscriberHold h
421− , subscriberInvalidateHeight = \_ -> return ()
422− , subscriberRecalculateHeight = \_ -> return ()
423− }
424−
425−newSubscriberFan :: forall x k. (HasSpiderTimeline x, GCompare k) => FanSubscribed x k -> IO (Subscriber x (DMap k Identity))
426−newSubscriberFan subscribed = return $ Subscriber
427− { subscriberPropagate = \a -> {-# SCC "traverseFan" #-} do
428− subs <- liftIO $ readIORef $ fanSubscribedSubscribers subscribed
429− tracePropagate (Proxy :: Proxy x) $ "SubscriberFan" <> showNodeId subscribed <> ": " ++ show (DMap.size subs) ++ " keys subscribed, " ++ show (DMap.size a) ++ " keys firing"
430− liftIO $ writeIORef (fanSubscribedOccurrence subscribed) $ Just a
431− scheduleClear $ fanSubscribedOccurrence subscribed
432− let f _ (Pair (Identity v) subsubs) = do
433− propagate v $ _fanSubscribedChildren_list subsubs
434− return $ Constant ()
435− _ <- DMap.traverseWithKey f $ DMap.intersectionWithKey (\_ -> Pair) a subs --TODO: Would be nice to have DMap.traverse_
436− return ()
437− , subscriberInvalidateHeight = \old -> do
438− when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberFan" <> showNodeId subscribed
439− subscribers <- readIORef $ fanSubscribedSubscribers subscribed
440− forM_ (DMap.toList subscribers) $ \(_ :=> v) -> WeakBag.traverse (_fanSubscribedChildren_list v) $ invalidateSubscriberHeight old
441− when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberFan" <> showNodeId subscribed <> " done"
442− , subscriberRecalculateHeight = \new -> do
443− when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberFan" <> showNodeId subscribed
444− subscribers <- readIORef $ fanSubscribedSubscribers subscribed
445− forM_ (DMap.toList subscribers) $ \(_ :=> v) -> WeakBag.traverse (_fanSubscribedChildren_list v) $ recalculateSubscriberHeight new
446− when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberFan" <> showNodeId subscribed <> " done"
447− }
448−
449−newSubscriberSwitch :: forall x a. HasSpiderTimeline x => SwitchSubscribed x a -> IO (Subscriber x a)
450−newSubscriberSwitch subscribed = return $ Subscriber
451− { subscriberPropagate = \a -> {-# SCC "traverseSwitch" #-} do
452− tracePropagate (Proxy :: Proxy x) $ "SubscriberSwitch" <> showNodeId subscribed
453− liftIO $ writeIORef (switchSubscribedOccurrence subscribed) $ Just a
454− scheduleClear $ switchSubscribedOccurrence subscribed
455− propagate a $ switchSubscribedSubscribers subscribed
456− , subscriberInvalidateHeight = \_ -> do
457− when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberSwitch" <> showNodeId subscribed
458− oldHeight <- readIORef $ switchSubscribedHeight subscribed
459− when (oldHeight /= invalidHeight) $ do
460− writeIORef (switchSubscribedHeight subscribed) $! invalidHeight
461− WeakBag.traverse (switchSubscribedSubscribers subscribed) $ invalidateSubscriberHeight oldHeight
462− when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberSwitch" <> showNodeId subscribed <> " done"
463− , subscriberRecalculateHeight = \new -> do
464− when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberSwitch" <> showNodeId subscribed
465− updateSwitchHeight new subscribed
466− when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberSwitch" <> showNodeId subscribed <> " done"
467− }
468−
469−newSubscriberCoincidenceOuter :: forall x b. HasSpiderTimeline x => CoincidenceSubscribed x b -> IO (Subscriber x (Event x b))
470−newSubscriberCoincidenceOuter subscribed = return $ Subscriber
471− { subscriberPropagate = \a -> {-# SCC "traverseCoincidenceOuter" #-} do
472− tracePropagate (Proxy :: Proxy x) $ "SubscriberCoincidenceOuter" <> showNodeId subscribed
473− outerHeight <- liftIO $ readIORef $ coincidenceSubscribedHeight subscribed
474− tracePropagate (Proxy :: Proxy x) $ " outerHeight = " <> show outerHeight
475− (occ, innerHeight, innerSubd) <- subscribeCoincidenceInner a outerHeight subscribed
476− tracePropagate (Proxy :: Proxy x) $ " isJust occ = " <> show (isJust occ)
477− tracePropagate (Proxy :: Proxy x) $ " innerHeight = " <> show innerHeight
478− liftIO $ writeIORef (coincidenceSubscribedInnerParent subscribed) $ Just innerSubd
479− scheduleClear $ coincidenceSubscribedInnerParent subscribed
480− case occ of
481− Nothing -> do
482− when (innerHeight > outerHeight) $ liftIO $ do -- If the event fires, it will fire at a later height
483− writeIORef (coincidenceSubscribedHeight subscribed) $! innerHeight
484− WeakBag.traverse (coincidenceSubscribedSubscribers subscribed) $ invalidateSubscriberHeight outerHeight
485− WeakBag.traverse (coincidenceSubscribedSubscribers subscribed) $ recalculateSubscriberHeight innerHeight
486− Just o -> do -- Since it's already firing, no need to adjust height
487− liftIO $ writeIORef (coincidenceSubscribedOccurrence subscribed) occ
488− scheduleClear $ coincidenceSubscribedOccurrence subscribed
489− propagate o $ coincidenceSubscribedSubscribers subscribed
490− , subscriberInvalidateHeight = \_ -> do
491− when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberCoincidenceOuter" <> showNodeId subscribed
492− invalidateCoincidenceHeight subscribed
493− when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberCoincidenceOuter" <> showNodeId subscribed <> " done"
494− , subscriberRecalculateHeight = \_ -> do
495− when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberCoincidenceOuter" <> showNodeId subscribed
496− recalculateCoincidenceHeight subscribed
497− when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberCoincidenceOuter" <> showNodeId subscribed <> " done"
498− }
499−
500−newSubscriberCoincidenceInner :: forall x a. HasSpiderTimeline x => CoincidenceSubscribed x a -> IO (Subscriber x a)
501−newSubscriberCoincidenceInner subscribed = return $ Subscriber
502− { subscriberPropagate = \a -> {-# SCC "traverseCoincidenceInner" #-} do
503− tracePropagate (Proxy :: Proxy x) $ "SubscriberCoincidenceInner" <> showNodeId subscribed
504− occ <- liftIO $ readIORef $ coincidenceSubscribedOccurrence subscribed
505− case occ of
506− Just _ -> return () -- SubscriberCoincidenceOuter must have already propagated this event
507− Nothing -> do
508− liftIO $ writeIORef (coincidenceSubscribedOccurrence subscribed) $ Just a
509− scheduleClear $ coincidenceSubscribedOccurrence subscribed
510− propagate a $ coincidenceSubscribedSubscribers subscribed
511− , subscriberInvalidateHeight = \_ -> do
512− when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberCoincidenceInner" <> showNodeId subscribed
513− invalidateCoincidenceHeight subscribed
514− when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberCoincidenceInner" <> showNodeId subscribed <> " done"
515− , subscriberRecalculateHeight = \_ -> do
516− when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberCoincidenceInner" <> showNodeId subscribed
517− recalculateCoincidenceHeight subscribed
518− when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberCoincidenceInner" <> showNodeId subscribed <> " done"
519− }
520−
521−invalidateSubscriberHeight :: Height -> Subscriber x a -> IO ()
522−invalidateSubscriberHeight = flip subscriberInvalidateHeight
523−
524−recalculateSubscriberHeight :: Height -> Subscriber x a -> IO ()
525−recalculateSubscriberHeight = flip subscriberRecalculateHeight
526−
527−-- | Propagate everything at the current height
528−propagate :: a -> WeakBag (Subscriber x a) -> EventM x ()
529−propagate a subscribers = withIncreasedDepth $ do
530− -- 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
531− --TODO: Should we check if nodes already have their values before propagating? Maybe we're re-doing work
532− WeakBag.traverse subscribers $ \s -> subscriberPropagate s a
533−
534−-- | Propagate everything at the current height
535−propagateFast :: a -> FastWeakBag (Subscriber x a) -> EventM x ()
536−propagateFast a subscribers = withIncreasedDepth $ do
537− -- 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
538− --TODO: Should we check if nodes already have their values before propagating? Maybe we're re-doing work
539− FastWeakBag.traverse subscribers $ \s -> subscriberPropagate s a
540−
541−--------------------------------------------------------------------------------
542−-- EventSubscribed
543−--------------------------------------------------------------------------------
544−
545−toAny :: a -> Any
546−toAny = unsafeCoerce
547−
548−data EventSubscribed x = EventSubscribed
549− { eventSubscribedHeightRef :: {-# UNPACK #-} !(IORef Height)
550− , eventSubscribedRetained :: {-# NOUNPACK #-} !Any
551−#ifdef DEBUG_CYCLES
552− , eventSubscribedGetParents :: !(IO [Some (EventSubscribed x)]) -- For debugging loops
553− , eventSubscribedHasOwnHeightRef :: !Bool
554− , eventSubscribedWhoCreated :: !(IO [String])
555−#endif
556− }
557−
558−eventSubscribedRoot :: RootSubscribed x a -> EventSubscribed x
559−eventSubscribedRoot !r = EventSubscribed
560− { eventSubscribedHeightRef = zeroRef
561− , eventSubscribedRetained = toAny r
562−#ifdef DEBUG_CYCLES
563− , eventSubscribedGetParents = return []
564− , eventSubscribedHasOwnHeightRef = False
565− , eventSubscribedWhoCreated = return ["root"]
566−#endif
567− }
568−
569−eventSubscribedNever :: EventSubscribed x
570−eventSubscribedNever = EventSubscribed
571− { eventSubscribedHeightRef = zeroRef
572− , eventSubscribedRetained = toAny ()
573−#ifdef DEBUG_CYCLES
574− , eventSubscribedGetParents = return []
575− , eventSubscribedHasOwnHeightRef = False
576− , eventSubscribedWhoCreated = return ["never"]
577−#endif
578− }
579−
580−eventSubscribedFan :: FanSubscribed x k -> EventSubscribed x
581−eventSubscribedFan !subscribed = EventSubscribed
582− { eventSubscribedHeightRef = eventSubscribedHeightRef $ _eventSubscription_subscribed $ fanSubscribedParent subscribed
583− , eventSubscribedRetained = toAny subscribed
584−#ifdef DEBUG_CYCLES
585− , eventSubscribedGetParents = return [Some.This $ _eventSubscription_subscribed $ fanSubscribedParent subscribed]
586− , eventSubscribedHasOwnHeightRef = False
587− , eventSubscribedWhoCreated = whoCreatedIORef $ fanSubscribedCachedSubscribed subscribed
588−#endif
589− }
590−
591−eventSubscribedSwitch :: SwitchSubscribed x a -> EventSubscribed x
592−eventSubscribedSwitch !subscribed = EventSubscribed
593− { eventSubscribedHeightRef = switchSubscribedHeight subscribed
594− , eventSubscribedRetained = toAny subscribed
595−#ifdef DEBUG_CYCLES
596− , eventSubscribedGetParents = do
597− s <- readIORef $ switchSubscribedCurrentParent subscribed
598− return [Some.This $ _eventSubscription_subscribed s]
599− , eventSubscribedHasOwnHeightRef = True
600− , eventSubscribedWhoCreated = whoCreatedIORef $ switchSubscribedCachedSubscribed subscribed
601−#endif
602− }
603−
604−eventSubscribedCoincidence :: CoincidenceSubscribed x a -> EventSubscribed x
605−eventSubscribedCoincidence !subscribed = EventSubscribed
606− { eventSubscribedHeightRef = coincidenceSubscribedHeight subscribed
607− , eventSubscribedRetained = toAny subscribed
608−#ifdef DEBUG_CYCLES
609− , eventSubscribedGetParents = do
610− innerSubscription <- readIORef $ coincidenceSubscribedInnerParent subscribed
611− let outerParent = Some.This $ _eventSubscription_subscribed $ coincidenceSubscribedOuterParent subscribed
612− innerParents = maybeToList $ fmap Some.This innerSubscription
613− return $ outerParent : innerParents
614− , eventSubscribedHasOwnHeightRef = True
615− , eventSubscribedWhoCreated = whoCreatedIORef $ coincidenceSubscribedCachedSubscribed subscribed
616−#endif
617− }
618−
619−getEventSubscribedHeight :: EventSubscribed x -> IO Height
620−getEventSubscribedHeight es = readIORef $ eventSubscribedHeightRef es
621−
622−#ifdef DEBUG_CYCLES
623−whoCreatedEventSubscribed :: EventSubscribed x -> IO [String]
624−whoCreatedEventSubscribed = eventSubscribedWhoCreated
625−
626−walkInvalidHeightParents :: EventSubscribed x -> IO [Some (EventSubscribed x)]
627−walkInvalidHeightParents s0 = do
628− subscribers <- flip execStateT mempty $ ($ Some.This s0) $ fix $ \loop (Some.This s) -> do
629− h <- liftIO $ readIORef $ eventSubscribedHeightRef s
630− when (h == invalidHeight) $ do
631− when (eventSubscribedHasOwnHeightRef s) $ liftIO $ writeIORef (eventSubscribedHeightRef s) $! invalidHeightBeingTraversed
632− modify (Some.This s :)
633− mapM_ loop =<< liftIO (eventSubscribedGetParents s)
634− forM_ subscribers $ \(Some.This s) -> writeIORef (eventSubscribedHeightRef s) $! invalidHeight
635− return subscribers
636−#endif
637−
638−{-# INLINE subscribeHoldEvent #-}
639−subscribeHoldEvent :: Hold x p -> Subscriber x p -> EventM x (EventSubscription x, Maybe p)
640−subscribeHoldEvent = subscribeAndRead . holdEvent
641−
642−--------------------------------------------------------------------------------
643−-- Behavior
644−--------------------------------------------------------------------------------
645−
646−newtype Behavior x a = Behavior { readBehaviorTracked :: BehaviorM x a }
647−
648−behaviorHold :: Hold x p -> Behavior x (PatchTarget p)
649−behaviorHold !h = Behavior $ readHoldTracked h
650−
651−behaviorHoldIdentity :: Hold x (Identity a) -> Behavior x a
652−behaviorHoldIdentity = behaviorHold
653−
654−behaviorConst :: a -> Behavior x a
655−behaviorConst !a = Behavior $ return a
656−
657−behaviorPull :: Pull x a -> Behavior x a
658−behaviorPull !p = Behavior $ do
659− val <- liftIO $ readIORef $ pullValue p
660− case val of
661− Just subscribed -> do
662− askParentsRef >>= mapM_ (\r -> liftIO $ modifyIORef' r (SomeBehaviorSubscribed (Some.This (BehaviorSubscribedPull subscribed)) :))
663− askInvalidator >>= mapM_ (\wi -> liftIO $ modifyIORef' (pullSubscribedInvalidators subscribed) (wi:))
664− liftIO $ touch $ pullSubscribedOwnInvalidator subscribed
665− return $ pullSubscribedValue subscribed
666− Nothing -> do
667− i <- liftIO $ newInvalidatorPull p
668− wi <- liftIO $ mkWeakPtrWithDebug i "InvalidatorPull"
669− parentsRef <- liftIO $ newIORef []
670− holdInits <- askBehaviorHoldInits
671− a <- liftIO $ runReaderT (unBehaviorM $ pullCompute p) (Just (wi, parentsRef), holdInits)
672− invsRef <- liftIO . newIORef . maybeToList =<< askInvalidator
673− parents <- liftIO $ readIORef parentsRef
674− let subscribed = PullSubscribed
675− { pullSubscribedValue = a
676− , pullSubscribedInvalidators = invsRef
677− , pullSubscribedOwnInvalidator = i
678− , pullSubscribedParents = parents
679− }
680− liftIO $ writeIORef (pullValue p) $ Just subscribed
681− askParentsRef >>= mapM_ (\r -> liftIO $ modifyIORef' r (SomeBehaviorSubscribed (Some.This (BehaviorSubscribedPull subscribed)) :))
682− return a
683−
684−behaviorDyn :: Patch p => Dyn x p -> Behavior x (PatchTarget p)
685−behaviorDyn !d = Behavior $ readHoldTracked =<< getDynHold d
686−
687−{-# INLINE readHoldTracked #-}
688−readHoldTracked :: Hold x p -> BehaviorM x (PatchTarget p)
689−readHoldTracked h = do
690− result <- liftIO $ readIORef $ holdValue h
691− askInvalidator >>= mapM_ (\wi -> liftIO $ modifyIORef' (holdInvalidators h) (wi:))
692− askParentsRef >>= mapM_ (\r -> liftIO $ modifyIORef' r (SomeBehaviorSubscribed (Some.This (BehaviorSubscribedHold h)) :))
693− liftIO $ touch h -- Otherwise, if this gets inlined enough, the hold's parent reference may get collected
694− return result
695−
696−{-# INLINABLE readBehaviorUntracked #-}
697−readBehaviorUntracked :: Defer (SomeHoldInit x) m => Behavior x a -> m a
698−readBehaviorUntracked b = do
699− holdInits <- getDeferralQueue
700− liftIO $ runBehaviorM (readBehaviorTracked b) Nothing holdInits --TODO: Specialize readBehaviorTracked to the Nothing and Just cases
701−
702−--------------------------------------------------------------------------------
703−-- Dynamic
704−--------------------------------------------------------------------------------
705−
706−data Dynamic x p = Dynamic
707− { dynamicCurrent :: !(Behavior x (PatchTarget p))
708− , dynamicUpdated :: Event x p -- This must be lazy; see the comment on holdEvent --TODO: Would this let us eliminate `Dyn`?
709− }
710−
711−dynamicHold :: Hold x p -> Dynamic x p
712−dynamicHold !h = Dynamic
713− { dynamicCurrent = behaviorHold h
714− , dynamicUpdated = eventHold h
715− }
716−
717−dynamicHoldIdentity :: Hold x (Identity a) -> Dynamic x (Identity a)
718−dynamicHoldIdentity = dynamicHold
719−
720−dynamicConst :: PatchTarget p -> Dynamic x p
721−dynamicConst !a = Dynamic
722− { dynamicCurrent = behaviorConst a
723− , dynamicUpdated = eventNever
724− }
725−
726−dynamicDyn :: (HasSpiderTimeline x, Patch p) => Dyn x p -> Dynamic x p
727−dynamicDyn !d = Dynamic
728− { dynamicCurrent = behaviorDyn d
729− , dynamicUpdated = eventDyn d
730− }
731−
732−dynamicDynIdentity :: HasSpiderTimeline x => Dyn x (Identity a) -> Dynamic x (Identity a)
733−dynamicDynIdentity = dynamicDyn
734−
735−--------------------------------------------------------------------------------
736−-- Combinators
737−--------------------------------------------------------------------------------
738−
739−--TODO: Figure out why certain things are not 'representational', then make them
740−--representational so we can use coerce
741−
742−--type role Hold representational
743−data Hold x p
744− = Hold { holdValue :: !(IORef (PatchTarget p))
745− , holdInvalidators :: !(IORef [Weak (Invalidator x)])
746− , holdEvent :: Event x p -- This must be lazy, or holds cannot be defined before their input Events
747− , holdParent :: !(IORef (Maybe (EventSubscription x))) -- Keeps its parent alive (will be undefined until the hold is initialized) --TODO: Probably shouldn't be an IORef
748−#ifdef DEBUG_NODEIDS
749− , holdNodeId :: Int
750−#endif
751− }
752−
753−-- | A statically allocated 'SpiderTimeline'
754−data Global
755−
756−{-# NOINLINE globalSpiderTimelineEnv #-}
757−globalSpiderTimelineEnv :: SpiderTimelineEnv Global
758−globalSpiderTimelineEnv = unsafePerformIO unsafeNewSpiderTimelineEnv
759−
760−-- | Stores all global data relevant to a particular Spider timeline; only one
761−-- value should exist for each type @x@
762−data SpiderTimelineEnv x = SpiderTimelineEnv
763− { _spiderTimeline_lock :: {-# UNPACK #-} !(MVar ())
764− , _spiderTimeline_eventEnv :: {-# UNPACK #-} !(EventEnv x)
765−#ifdef DEBUG
766− , _spiderTimeline_depth :: {-# UNPACK #-} !(IORef Int)
767−#endif
768− }
769−type role SpiderTimelineEnv nominal
770−
771−instance Eq (SpiderTimelineEnv x) where
772− _ == _ = True -- Since only one exists of each type
773−
774−instance GEq SpiderTimelineEnv where
775− a `geq` b = if _spiderTimeline_lock a == _spiderTimeline_lock b
776− then Just $ unsafeCoerce Refl -- This unsafeCoerce is safe because the same SpiderTimelineEnv can't have two different 'x' arguments
777− else Nothing
778−
779−data EventEnv x
780− = EventEnv { eventEnvAssignments :: !(IORef [SomeAssignment x]) -- Needed for Subscribe
781− , eventEnvHoldInits :: !(IORef [SomeHoldInit x]) -- Needed for Subscribe
782− , eventEnvDynInits :: !(IORef [SomeDynInit x])
783− , eventEnvMergeUpdates :: !(IORef [SomeMergeUpdate x])
784− , eventEnvMergeInits :: !(IORef [SomeMergeInit x]) -- Needed for Subscribe
785− , eventEnvClears :: !(IORef [Some Clear]) -- Needed for Subscribe
786− , eventEnvIntClears :: !(IORef [Some IntClear])
787− , eventEnvRootClears :: !(IORef [Some RootClear])
788− , eventEnvCurrentHeight :: !(IORef Height) -- Needed for Subscribe
789− , eventEnvResetCoincidences :: !(IORef [SomeResetCoincidence x]) -- Needed for Subscribe
790− , eventEnvDelayedMerges :: !(IORef (IntMap [EventM x ()]))
791− }
792−
793−{-# INLINE runEventM #-}
794−runEventM :: EventM x a -> IO a
795−runEventM = unEventM
796−
797−asksEventEnv :: forall x a. HasSpiderTimeline x => (EventEnv x -> a) -> EventM x a
798−asksEventEnv f = return $ f $ _spiderTimeline_eventEnv (spiderTimeline :: SpiderTimelineEnv x)
799−
800−class MonadIO m => Defer a m where
801− getDeferralQueue :: m (IORef [a])
802−
803−{-# INLINE defer #-}
804−defer :: Defer a m => a -> m ()
805−defer a = do
806− q <- getDeferralQueue
807− liftIO $ modifyIORef' q (a:)
808−
809−instance HasSpiderTimeline x => Defer (SomeAssignment x) (EventM x) where
810− {-# INLINE getDeferralQueue #-}
811− getDeferralQueue = asksEventEnv eventEnvAssignments
812−
813−instance HasSpiderTimeline x => Defer (SomeHoldInit x) (EventM x) where
814− {-# INLINE getDeferralQueue #-}
815− getDeferralQueue = asksEventEnv eventEnvHoldInits
816−
817−instance HasSpiderTimeline x => Defer (SomeDynInit x) (EventM x) where
818− {-# INLINE getDeferralQueue #-}
819− getDeferralQueue = asksEventEnv eventEnvDynInits
820−
821−instance Defer (SomeHoldInit x) (BehaviorM x) where
822− {-# INLINE getDeferralQueue #-}
823− getDeferralQueue = BehaviorM $ asks snd
824−
825−instance HasSpiderTimeline x => Defer (SomeMergeUpdate x) (EventM x) where
826− {-# INLINE getDeferralQueue #-}
827− getDeferralQueue = asksEventEnv eventEnvMergeUpdates
828−
829−instance HasSpiderTimeline x => Defer (SomeMergeInit x) (EventM x) where
830− {-# INLINE getDeferralQueue #-}
831− getDeferralQueue = asksEventEnv eventEnvMergeInits
832−
833−class HasSpiderTimeline x => HasCurrentHeight x m | m -> x where
834− getCurrentHeight :: m Height
835− scheduleMerge :: Height -> EventM x () -> m ()
836−
837−instance HasSpiderTimeline x => HasCurrentHeight x (EventM x) where
838− {-# INLINE getCurrentHeight #-}
839− getCurrentHeight = do
840− heightRef <- asksEventEnv eventEnvCurrentHeight
841− liftIO $ readIORef heightRef
842− {-# INLINE scheduleMerge #-}
843− scheduleMerge height subscribed = do
844− delayedRef <- asksEventEnv eventEnvDelayedMerges
845− liftIO $ modifyIORef' delayedRef $ IntMap.insertWith (++) (unHeight height) [subscribed]
846−
847−class HasSpiderTimeline x where
848− -- | Retrieve the current SpiderTimelineEnv
849− spiderTimeline :: SpiderTimelineEnv x
850−
851−instance HasSpiderTimeline Global where
852− spiderTimeline = globalSpiderTimelineEnv
853−
854−putCurrentHeight :: HasSpiderTimeline x => Height -> EventM x ()
855−putCurrentHeight h = do
856− heightRef <- asksEventEnv eventEnvCurrentHeight
857− liftIO $ writeIORef heightRef $! h
858−
859−instance HasSpiderTimeline x => Defer (Some Clear) (EventM x) where
860− {-# INLINE getDeferralQueue #-}
861− getDeferralQueue = asksEventEnv eventEnvClears
862−
863−{-# INLINE scheduleClear #-}
864−scheduleClear :: Defer (Some Clear) m => IORef (Maybe a) -> m ()
865−scheduleClear r = defer $ Some.This $ Clear r
866−
867−instance HasSpiderTimeline x => Defer (Some IntClear) (EventM x) where
868− {-# INLINE getDeferralQueue #-}
869− getDeferralQueue = asksEventEnv eventEnvIntClears
870−
871−{-# INLINE scheduleIntClear #-}
872−scheduleIntClear :: Defer (Some IntClear) m => IORef (IntMap a) -> m ()
873−scheduleIntClear r = defer $ Some.This $ IntClear r
874−
875−instance HasSpiderTimeline x => Defer (Some RootClear) (EventM x) where
876− {-# INLINE getDeferralQueue #-}
877− getDeferralQueue = asksEventEnv eventEnvRootClears
878−
879−{-# INLINE scheduleRootClear #-}
880−scheduleRootClear :: Defer (Some RootClear) m => IORef (DMap k Identity) -> m ()
881−scheduleRootClear r = defer $ Some.This $ RootClear r
882−
883−instance HasSpiderTimeline x => Defer (SomeResetCoincidence x) (EventM x) where
884− {-# INLINE getDeferralQueue #-}
885− getDeferralQueue = asksEventEnv eventEnvResetCoincidences
886−
887−-- Note: hold cannot examine its event until after the phase is over
888−{-# INLINE [1] hold #-}
889−hold :: (Patch p, Defer (SomeHoldInit x) m) => PatchTarget p -> Event x p -> m (Hold x p)
890−hold v0 e = do
891− valRef <- liftIO $ newIORef v0
892− invsRef <- liftIO $ newIORef []
893− parentRef <- liftIO $ newIORef Nothing
894−#ifdef DEBUG_NODEIDS
895− nodeId <- liftIO newNodeId
896−#endif
897− let h = Hold
898− { holdValue = valRef
899− , holdInvalidators = invsRef
900− , holdEvent = e
901− , holdParent = parentRef
902−#ifdef DEBUG_NODEIDS
903− , holdNodeId = nodeId
904−#endif
905− }
906− defer $ SomeHoldInit h
907− return h
908−
909−{-# INLINE getHoldEventSubscription #-}
910−getHoldEventSubscription :: forall p x. (HasSpiderTimeline x, Patch p) => Hold x p -> EventM x (EventSubscription x)
911−getHoldEventSubscription h = do
912− ep <- liftIO $ readIORef $ holdParent h
913− case ep of
914− Just subd -> return subd
915− Nothing -> do
916− let e = holdEvent h
917− subscriptionRef <- liftIO $ newIORef $ error "getHoldEventSubscription: subdRef uninitialized"
918− (subscription@(EventSubscription _ _), occ) <- subscribeAndRead e =<< liftIO (newSubscriberHold h)
919− liftIO $ writeIORef subscriptionRef $! subscription
920− case occ of
921− Nothing -> return ()
922− Just o -> do
923− old <- liftIO $ readIORef $ holdValue h
924− case apply o old of
925− Nothing -> return ()
926− Just new -> do
927− -- Need to evaluate these so that we don't retain the Hold itself
928− v <- liftIO $ evaluate $ holdValue h
929− i <- liftIO $ evaluate $ holdInvalidators h
930− defer $ SomeAssignment v i new
931− liftIO $ writeIORef (holdParent h) $ Just subscription
932− return subscription
933−
934−type BehaviorEnv x = (Maybe (Weak (Invalidator x), IORef [SomeBehaviorSubscribed x]), IORef [SomeHoldInit x])
935−
936−--type role BehaviorM representational
937−-- BehaviorM can sample behaviors
938−newtype BehaviorM x a = BehaviorM { unBehaviorM :: ReaderT (BehaviorEnv x) IO a } deriving (Functor, Applicative, MonadIO, MonadFix)
939−
940−instance Monad (BehaviorM x) where
941− {-# INLINE (>>=) #-}
942− BehaviorM x >>= f = BehaviorM $ x >>= unBehaviorM . f
943− {-# INLINE (>>) #-}
944− BehaviorM x >> BehaviorM y = BehaviorM $ x >> y
945− {-# INLINE return #-}
946− return x = BehaviorM $ return x
947− {-# INLINE fail #-}
948− fail s = BehaviorM $ fail s
949−
950−data BehaviorSubscribed x a
951− = forall p. BehaviorSubscribedHold (Hold x p)
952− | BehaviorSubscribedPull (PullSubscribed x a)
953−
954−newtype SomeBehaviorSubscribed x = SomeBehaviorSubscribed (Some (BehaviorSubscribed x))
955−
956−--type role PullSubscribed representational
957−data PullSubscribed x a
958− = PullSubscribed { pullSubscribedValue :: !a
959− , pullSubscribedInvalidators :: !(IORef [Weak (Invalidator x)])
960− , pullSubscribedOwnInvalidator :: !(Invalidator x)
961− , pullSubscribedParents :: ![SomeBehaviorSubscribed x] -- Need to keep parent behaviors alive, or they won't let us know when they're invalidated
962− }
963−
964−--type role Pull representational
965−data Pull x a
966− = Pull { pullValue :: !(IORef (Maybe (PullSubscribed x a)))
967− , pullCompute :: !(BehaviorM x a)
968−#ifdef DEBUG_NODEIDS
969− , pullNodeId :: Int
970−#endif
971− }
972−
973−data Invalidator x
974− = forall a. InvalidatorPull (Pull x a)
975− | forall a. InvalidatorSwitch (SwitchSubscribed x a)
976−
977−data RootSubscribed x a = forall k. GCompare k => RootSubscribed
978− { rootSubscribedKey :: !(k a)
979− , rootSubscribedCachedSubscribed :: !(IORef (DMap k (RootSubscribed x))) -- From the original Root
980− , rootSubscribedSubscribers :: !(WeakBag (Subscriber x a))
981− , rootSubscribedOccurrence :: !(IO (Maybe a)) -- Lookup from rootOccurrence
982− , rootSubscribedUninit :: IO ()
983− , 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?
984−#ifdef DEBUG_NODEIDS
985− , rootSubscribedNodeId :: Int
986−#endif
987− }
988−
989−data Root x (k :: * -> *)
990− = Root { rootOccurrence :: !(IORef (DMap k Identity)) -- The currently-firing occurrence of this event
991− , rootSubscribed :: !(IORef (DMap k (RootSubscribed x)))
992− , rootInit :: !(forall a. k a -> RootTrigger x a -> IO (IO ()))
993− }
994−
995−data SomeHoldInit x = forall p. Patch p => SomeHoldInit !(Hold x p)
996−
997−data SomeDynInit x = forall p. Patch p => SomeDynInit !(Dyn x p)
998−
999−data SomeMergeUpdate x = SomeMergeUpdate
1000− { _someMergeUpdate_update :: !(EventM x [EventSubscription x])
1001− , _someMergeUpdate_invalidateHeight :: !(IO ())
1002− , _someMergeUpdate_recalculateHeight :: !(IO ())
1003− }
1004−
1005−newtype SomeMergeInit x = SomeMergeInit { unSomeMergeInit :: EventM x () }
1006−
1007−-- EventM can do everything BehaviorM can, plus create holds
1008−newtype EventM x a = EventM { unEventM :: IO a } deriving (Functor, Applicative, Monad, MonadIO, MonadFix, 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
1009−
1010−newtype MergeSubscribedParent x a = MergeSubscribedParent { unMergeSubscribedParent :: EventSubscription x }
1011−
1012−data MergeSubscribedParentWithMove x k a = MergeSubscribedParentWithMove
1013− { _mergeSubscribedParentWithMove_subscription :: !(EventSubscription x)
1014− , _mergeSubscribedParentWithMove_key :: !(IORef (k a))
1015− }
1016−
1017−data HeightBag = HeightBag
1018− { _heightBag_size :: {-# UNPACK #-} !Int
1019− , _heightBag_contents :: !(IntMap Word) -- Number of excess in each bucket
1020− }
1021− deriving (Show, Read, Eq, Ord)
1022−
1023−heightBagEmpty :: HeightBag
1024−heightBagEmpty = heightBagVerify $ HeightBag 0 IntMap.empty
1025−
1026−heightBagSize :: HeightBag -> Int
1027−heightBagSize = _heightBag_size
1028−
1029−heightBagFromList :: [Height] -> HeightBag
1030−heightBagFromList heights = heightBagVerify $ foldl' (flip heightBagAdd) heightBagEmpty heights
1031−
1032−heightBagAdd :: Height -> HeightBag -> HeightBag
1033−heightBagAdd (Height h) (HeightBag s c) = heightBagVerify $ HeightBag (succ s) $ IntMap.insertWithKey (\_ _ old -> succ old) h 0 c
1034−
1035−heightBagRemove :: Height -> HeightBag -> HeightBag
1036−heightBagRemove (Height h) b@(HeightBag s c) = heightBagVerify $ case IntMap.lookup h c of
1037− Nothing -> error $ "heightBagRemove: Height " <> show h <> " not present in bag " <> show b
1038− Just old -> HeightBag (pred s) $ case old of
1039− 0 -> IntMap.delete h c
1040− _ -> IntMap.insert h (pred old) c
1041−
1042−heightBagMax :: HeightBag -> Height
1043−heightBagMax (HeightBag _ c) = case IntMap.maxViewWithKey c of
1044− Just ((h, _), _) -> Height h
1045− Nothing -> zeroHeight
1046−
1047−heightBagVerify :: HeightBag -> HeightBag
1048−#ifdef DEBUG
1049−heightBagVerify b@(HeightBag s c) = if
1050− | s /= IntMap.size c + fromIntegral (sum (IntMap.elems c))
1051− -> error $ "heightBagVerify: size doesn't match: " <> show b
1052− | unHeight invalidHeight `IntMap.member` c
1053− -> error $ "heightBagVerify: contains invalid height: " <> show b
1054− | otherwise -> b
1055−#else
1056−heightBagVerify = id
1057−#endif
1058−
1059−data FanSubscribedChildren (x :: *) k a = FanSubscribedChildren
1060− { _fanSubscribedChildren_list :: !(WeakBag (Subscriber x a))
1061− , _fanSubscribedChildren_self :: {-# NOUNPACK #-} !(k a, FanSubscribed x k)
1062− , _fanSubscribedChildren_weakSelf :: !(IORef (Weak (k a, FanSubscribed x k)))
1063− }
1064−
1065−data FanSubscribed (x :: *) k
1066− = FanSubscribed { fanSubscribedCachedSubscribed :: !(IORef (Maybe (FanSubscribed x k)))
1067− , fanSubscribedOccurrence :: !(IORef (Maybe (DMap k Identity)))
1068− , fanSubscribedSubscribers :: !(IORef (DMap k (FanSubscribedChildren x k))) -- This DMap should never be empty
1069− , fanSubscribedParent :: !(EventSubscription x)
1070−#ifdef DEBUG_NODEIDS
1071− , fanSubscribedNodeId :: Int
1072−#endif
1073− }
1074−
1075−data Fan x k
1076− = Fan { fanParent :: !(Event x (DMap k Identity))
1077− , fanSubscribed :: !(IORef (Maybe (FanSubscribed x k)))
1078− }
1079−
1080−data SwitchSubscribed x a
1081− = SwitchSubscribed { switchSubscribedCachedSubscribed :: !(IORef (Maybe (SwitchSubscribed x a)))
1082− , switchSubscribedOccurrence :: !(IORef (Maybe a))
1083− , switchSubscribedHeight :: !(IORef Height)
1084− , switchSubscribedSubscribers :: !(WeakBag (Subscriber x a))
1085− , switchSubscribedOwnInvalidator :: {-# NOUNPACK #-} !(Invalidator x)
1086− , switchSubscribedOwnWeakInvalidator :: !(IORef (Weak (Invalidator x)))
1087− , switchSubscribedBehaviorParents :: !(IORef [SomeBehaviorSubscribed x])
1088− , switchSubscribedParent :: !(Behavior x (Event x a))
1089− , switchSubscribedCurrentParent :: !(IORef (EventSubscription x))
1090− , switchSubscribedWeakSelf :: !(IORef (Weak (SwitchSubscribed x a)))
1091−#ifdef DEBUG_NODEIDS
1092− , switchSubscribedNodeId :: Int
1093−#endif
1094− }
1095−
1096−data Switch x a
1097− = Switch { switchParent :: !(Behavior x (Event x a))
1098− , switchSubscribed :: !(IORef (Maybe (SwitchSubscribed x a)))
1099− }
1100−
1101−#ifdef USE_TEMPLATE_HASKELL
1102−{-# ANN CoincidenceSubscribed "HLint: ignore Redundant bracket" #-}
1103−#endif
1104−data CoincidenceSubscribed x a
1105− = CoincidenceSubscribed { coincidenceSubscribedCachedSubscribed :: !(IORef (Maybe (CoincidenceSubscribed x a)))
1106− , coincidenceSubscribedOccurrence :: !(IORef (Maybe a))
1107− , coincidenceSubscribedSubscribers :: !(WeakBag (Subscriber x a))
1108− , coincidenceSubscribedHeight :: !(IORef Height)
1109− , coincidenceSubscribedOuter :: {-# NOUNPACK #-} (Subscriber x (Event x a))
1110− , coincidenceSubscribedOuterParent :: !(EventSubscription x)
1111− , coincidenceSubscribedInnerParent :: !(IORef (Maybe (EventSubscribed x)))
1112− , coincidenceSubscribedWeakSelf :: !(IORef (Weak (CoincidenceSubscribed x a)))
1113−#ifdef DEBUG_NODEIDS
1114− , coincidenceSubscribedNodeId :: Int
1115−#endif
1116− }
1117−
1118−data Coincidence x a
1119− = Coincidence { coincidenceParent :: !(Event x (Event x a))
1120− , coincidenceSubscribed :: !(IORef (Maybe (CoincidenceSubscribed x a)))
1121− }
1122−
1123−{-# NOINLINE newInvalidatorSwitch #-}
1124−newInvalidatorSwitch :: SwitchSubscribed x a -> IO (Invalidator x)
1125−newInvalidatorSwitch subd = return $! InvalidatorSwitch subd
1126−
1127−{-# NOINLINE newInvalidatorPull #-}
1128−newInvalidatorPull :: Pull x a -> IO (Invalidator x)
1129−newInvalidatorPull p = return $! InvalidatorPull p
1130−
1131−instance HasSpiderTimeline x => Filterable (Event x) where
1132− mapMaybe f = push $ return . f
1133−
1134−instance HasSpiderTimeline x => Align (Event x) where
1135− nil = eventNever
1136−#if MIN_VERSION_these(0, 8, 0)
1137−instance HasSpiderTimeline x => Semialign (Event x) where
1138−#endif
1139− align ea eb = mapMaybe dmapToThese $ merge $ dynamicConst $ DMap.fromDistinctAscList [LeftTag :=> ea, RightTag :=> eb]
1140−
1141−data DynType x p = UnsafeDyn !(BehaviorM x (PatchTarget p), Event x p)
1142− | BuildDyn !(EventM x (PatchTarget p), Event x p)
1143− | HoldDyn !(Hold x p)
1144−
1145−newtype Dyn x p = Dyn { unDyn :: IORef (DynType x p) }
1146−
1147−newMapDyn :: HasSpiderTimeline x => (a -> b) -> Dynamic x (Identity a) -> Dynamic x (Identity b)
1148−newMapDyn f d = dynamicDynIdentity $ unsafeBuildDynamic (fmap f $ readBehaviorTracked $ dynamicCurrent d) (Identity . f . runIdentity <$> dynamicUpdated d)
1149−
1150−--TODO: Avoid the duplication between this and R.zipDynWith
1151−zipDynWith :: HasSpiderTimeline x => (a -> b -> c) -> Dynamic x (Identity a) -> Dynamic x (Identity b) -> Dynamic x (Identity c)
1152−zipDynWith f da db =
1153− let eab = align (dynamicUpdated da) (dynamicUpdated db)
1154− ec = flip push eab $ \o -> do
1155− (a, b) <- case o of
1156− This (Identity a) -> do
1157− b <- readBehaviorUntracked $ dynamicCurrent db
1158− return (a, b)
1159− That (Identity b) -> do
1160− a <- readBehaviorUntracked $ dynamicCurrent da
1161− return (a, b)
1162− These (Identity a) (Identity b) -> return (a, b)
1163− return $ Just $ Identity $ f a b
1164− in dynamicDynIdentity $ unsafeBuildDynamic (f <$> readBehaviorUntracked (dynamicCurrent da) <*> readBehaviorUntracked (dynamicCurrent db)) ec
1165−
1166−buildDynamic :: (Defer (SomeDynInit x) m, Patch p) => EventM x (PatchTarget p) -> Event x p -> m (Dyn x p)
1167−buildDynamic readV0 v' = do
1168− result <- liftIO $ newIORef $ BuildDyn (readV0, v')
1169− let !d = Dyn result
1170− defer $ SomeDynInit d
1171− return d
1172−
1173−unsafeBuildDynamic :: BehaviorM x (PatchTarget p) -> Event x p -> Dyn x p
1174−unsafeBuildDynamic readV0 v' = Dyn $ unsafeNewIORef x $ UnsafeDyn x
1175− where x = (readV0, v')
1176−
1177−-- ResultM can read behaviors and events
1178−type ResultM = EventM
1179−
1180−{-# NOINLINE unsafeNewIORef #-}
1181−unsafeNewIORef :: a -> b -> IORef b
1182−unsafeNewIORef a b = unsafePerformIO $ do
1183− touch a
1184− newIORef b
1185−
1186−instance HasSpiderTimeline x => Functor (Event x) where
1187− fmap f = push $ return . Just . f
1188−
1189−instance Functor (Behavior x) where
1190− fmap f = pull . fmap f . readBehaviorTracked
1191−
1192−{-# INLINE push #-}
1193−push :: HasSpiderTimeline x => (a -> ComputeM x (Maybe b)) -> Event x a -> Event x b
1194−push f e = cacheEvent (pushCheap f e)
1195−
1196−{-# INLINABLE pull #-}
1197−pull :: BehaviorM x a -> Behavior x a
1198−pull a = behaviorPull $ Pull
1199− { pullCompute = a
1200− , pullValue = unsafeNewIORef a Nothing
1201−#ifdef DEBUG_NODEIDS
1202− , pullNodeId = unsafeNodeId a
1203−#endif
1204− }
1205−
1206−{-# INLINABLE switch #-}
1207−switch :: HasSpiderTimeline x => Behavior x (Event x a) -> Event x a
1208−switch a = eventSwitch $ Switch
1209− { switchParent = a
1210− , switchSubscribed = unsafeNewIORef a Nothing
1211− }
1212−
1213−coincidence :: HasSpiderTimeline x => Event x (Event x a) -> Event x a
1214−coincidence a = eventCoincidence $ Coincidence
1215− { coincidenceParent = a
1216− , coincidenceSubscribed = unsafeNewIORef a Nothing
1217− }
1218−
1219−-- Propagate the given event occurrence; before cleaning up, run the given action, which may read the state of events and behaviors
1220−run :: forall x b. HasSpiderTimeline x => [DSum (RootTrigger x) Identity] -> ResultM x b -> SpiderHost x b
1221−run roots after = do
1222− tracePropagate (Proxy :: Proxy x) $ "Running an event frame with " <> show (length roots) <> " events"
1223− let t = spiderTimeline :: SpiderTimelineEnv x
1224− result <- SpiderHost $ withMVar (_spiderTimeline_lock t) $ \_ -> unSpiderHost $ runFrame $ do
1225− rootsToPropagate <- forM roots $ \r@(RootTrigger (_, occRef, k) :=> a) -> do
1226− occBefore <- liftIO $ do
1227− occBefore <- readIORef occRef
1228− writeIORef occRef $! DMap.insert k a occBefore
1229− return occBefore
1230− if DMap.null occBefore
1231− then do scheduleRootClear occRef
1232− return $ Just r
1233− else return Nothing
1234− forM_ (catMaybes rootsToPropagate) $ \(RootTrigger (subscribersRef, _, _) :=> Identity a) -> do
1235− propagate a subscribersRef
1236− delayedRef <- asksEventEnv eventEnvDelayedMerges
1237− let go = do
1238− delayed <- liftIO $ readIORef delayedRef
1239− case IntMap.minViewWithKey delayed of
1240− Nothing -> return ()
1241− Just ((currentHeight, cur), future) -> do
1242− tracePropagate (Proxy :: Proxy x) $ "Running height " ++ show currentHeight
1243− putCurrentHeight $ Height currentHeight
1244− liftIO $ writeIORef delayedRef $! future
1245− sequence_ cur
1246− go
1247− go
1248− putCurrentHeight maxBound
1249− after
1250− tracePropagate (Proxy :: Proxy x) "Done running an event frame"
1251− return result
1252−
1253−scheduleMerge' :: HasSpiderTimeline x => Height -> IORef Height -> EventM x () -> EventM x ()
1254−scheduleMerge' initialHeight heightRef a = scheduleMerge initialHeight $ do
1255− height <- liftIO $ readIORef heightRef
1256− currentHeight <- getCurrentHeight
1257− case height `compare` currentHeight of
1258− LT -> error "Somehow a merge's height has been decreased after it was scheduled"
1259− GT -> scheduleMerge' height heightRef a -- The height has been increased (by a coincidence event; TODO: is this the only way?)
1260− EQ -> a
1261−
1262−newtype Clear a = Clear (IORef (Maybe a))
1263−
1264−newtype IntClear a = IntClear (IORef (IntMap a))
1265−
1266−newtype RootClear k = RootClear (IORef (DMap k Identity))
1267−
1268−data SomeAssignment x = forall a. SomeAssignment {-# UNPACK #-} !(IORef a) {-# UNPACK #-} !(IORef [Weak (Invalidator x)]) a
1269−
1270−debugFinalize :: Bool
1271−debugFinalize = False
1272−
1273−mkWeakPtrWithDebug :: a -> String -> IO (Weak a)
1274−mkWeakPtrWithDebug x debugNote = do
1275− x' <- evaluate x
1276− mkWeakPtr x' $
1277− if debugFinalize
1278− then Just $ putStrLn $ "finalizing: " ++ debugNote
1279− else Nothing
1280−
1281−type WeakList a = [Weak a]
1282−
1283−{-# INLINE withIncreasedDepth #-}
1284−#ifdef DEBUG
1285−withIncreasedDepth :: CanTrace x m => m a -> m a
1286−withIncreasedDepth a = do
1287− spiderTimeline <- askSpiderTimelineEnv
1288− liftIO $ modifyIORef' (_spiderTimeline_depth spiderTimeline) succ
1289− result <- a
1290− liftIO $ modifyIORef' (_spiderTimeline_depth spiderTimeline) pred
1291− return result
1292−#else
1293−withIncreasedDepth :: m a -> m a
1294−withIncreasedDepth = id
1295−#endif
1296−
1297−type CanTrace x m = (HasSpiderTimeline x, MonadIO m)
1298−
1299−{-# INLINE tracePropagate #-}
1300−tracePropagate :: (CanTrace x m) => proxy x -> String -> m ()
1301−tracePropagate p = traceWhen p debugPropagate
1302−
1303−{-# INLINE traceInvalidate #-}
1304−traceInvalidate :: String -> IO ()
1305−traceInvalidate = when debugInvalidate . liftIO . putStrLn
1306−
1307−{-# INLINE traceWhen #-}
1308−traceWhen :: (CanTrace x m) => proxy x -> Bool -> String -> m ()
1309−traceWhen p b message = traceMWhen p b $ return message
1310−
1311−{-# INLINE traceMWhen #-}
1312−traceMWhen :: (CanTrace x m) => proxy x -> Bool -> m String -> m ()
1313−traceMWhen _ b getMessage = when b $ do
1314− message <- getMessage
1315−#ifdef DEBUG
1316− spiderTimeline <- askSpiderTimelineEnv
1317− d <- liftIO $ readIORef $ _spiderTimeline_depth spiderTimeline
1318−#else
1319− let d = 0
1320−#endif
1321− liftIO $ putStrLn $ replicate d ' ' <> message
1322−
1323−whoCreatedIORef :: IORef a -> IO [String]
1324−whoCreatedIORef (IORef a) = whoCreated $! a
1325−
1326−#ifdef DEBUG_CYCLES
1327−groupByHead :: Eq a => [NonEmpty a] -> [(a, NonEmpty [a])]
1328−groupByHead = \case
1329− [] -> []
1330− (x :| xs) : t -> case groupByHead t of
1331− [] -> [(x, xs :| [])]
1332− l@((y, yss) : t')
1333− | x == y -> (x, xs `NonEmpty.cons` yss) : t'
1334− | otherwise -> (x, xs :| []) : l
1335−
1336−listsToForest :: Eq a => [[a]] -> Forest a
1337−listsToForest l = fmap (\(a, l') -> Node a $ listsToForest $ toList l') $ groupByHead $ catMaybes $ fmap nonEmpty l
1338−#endif
1339−
1340−{-# INLINE propagateSubscriberHold #-}
1341−propagateSubscriberHold :: forall x p. (HasSpiderTimeline x, Patch p) => Hold x p -> p -> EventM x ()
1342−propagateSubscriberHold h a = do
1343− {-# SCC "trace" #-} traceMWhen (Proxy :: Proxy x) debugPropagate $ liftIO $ do
1344− invalidators <- liftIO $ readIORef $ holdInvalidators h
1345− return $ "SubscriberHold" <> showNodeId h <> ": " ++ show (length invalidators)
1346− v <- {-# SCC "read" #-} liftIO $ readIORef $ holdValue h
1347− case {-# SCC "apply" #-} apply a v of
1348− Nothing -> return ()
1349− Just v' -> do
1350− {-# SCC "trace2" #-} withIncreasedDepth $ tracePropagate (Proxy :: Proxy x) $ "propagateSubscriberHold: assigning Hold" <> showNodeId h
1351− vRef <- {-# SCC "vRef" #-} liftIO $ evaluate $ holdValue h
1352− iRef <- {-# SCC "iRef" #-} liftIO $ evaluate $ holdInvalidators h
1353− defer $ {-# SCC "assignment" #-} SomeAssignment vRef iRef v'
1354−
1355−data SomeResetCoincidence x = forall a. SomeResetCoincidence !(EventSubscription x) !(Maybe (CoincidenceSubscribed x a)) -- The CoincidenceSubscriber will be present only if heights need to be reset
1356−
1357−runBehaviorM :: BehaviorM x a -> Maybe (Weak (Invalidator x), IORef [SomeBehaviorSubscribed x]) -> IORef [SomeHoldInit x] -> IO a
1358−runBehaviorM a mwi holdInits = runReaderT (unBehaviorM a) (mwi, holdInits)
1359−
1360−askInvalidator :: BehaviorM x (Maybe (Weak (Invalidator x)))
1361−askInvalidator = do
1362− (!m, _) <- BehaviorM ask
1363− case m of
1364− Nothing -> return Nothing
1365− Just (!wi, _) -> return $ Just wi
1366−
1367−askParentsRef :: BehaviorM x (Maybe (IORef [SomeBehaviorSubscribed x]))
1368−askParentsRef = do
1369− (!m, _) <- BehaviorM ask
1370− case m of
1371− Nothing -> return Nothing
1372− Just (_, !p) -> return $ Just p
1373−
1374−askBehaviorHoldInits :: BehaviorM x (IORef [SomeHoldInit x])
1375−askBehaviorHoldInits = do
1376− (_, !his) <- BehaviorM ask
1377− return his
1378−
1379−{-# INLINE getDynHold #-}
1380−getDynHold :: (Defer (SomeHoldInit x) m, Patch p) => Dyn x p -> m (Hold x p)
1381−getDynHold d = do
1382− mh <- liftIO $ readIORef $ unDyn d
1383− case mh of
1384− HoldDyn h -> return h
1385− UnsafeDyn (readV0, v') -> do
1386− holdInits <- getDeferralQueue
1387− v0 <- liftIO $ runBehaviorM readV0 Nothing holdInits
1388− hold' v0 v'
1389− BuildDyn (readV0, v') -> do
1390− v0 <- liftIO $ runEventM readV0
1391− hold' v0 v'
1392− where
1393− hold' v0 v' = do
1394− h <- hold v0 v'
1395− liftIO $ writeIORef (unDyn d) $ HoldDyn h
1396− return h
1397−
1398−
1399−-- Always refers to 0
1400−{-# NOINLINE zeroRef #-}
1401−zeroRef :: IORef Height
1402−zeroRef = unsafePerformIO $ newIORef zeroHeight
1403−
1404−getRootSubscribed :: GCompare k => k a -> Root x k -> Subscriber x a -> IO (WeakBagTicket, RootSubscribed x a, Maybe a)
1405−getRootSubscribed k r sub = do
1406− mSubscribed <- readIORef $ rootSubscribed r
1407− let getOcc = fmap (coerce . DMap.lookup k) $ readIORef $ rootOccurrence r
1408− case DMap.lookup k mSubscribed of
1409− Just subscribed -> {-# SCC "hitRoot" #-} do
1410− sln <- subscribeRootSubscribed subscribed sub
1411− occ <- getOcc
1412− return (sln, subscribed, occ)
1413− Nothing -> {-# SCC "missRoot" #-} do
1414− weakSelf <- newIORef $ error "getRootSubscribed: weakSelfRef not initialized"
1415− let !cached = rootSubscribed r
1416− uninitRef <- newIORef $ error "getRootsubscribed: uninitRef not initialized"
1417− (subs, sln) <- WeakBag.singleton sub weakSelf cleanupRootSubscribed
1418− when debugPropagate $ putStrLn $ "getRootSubscribed: calling rootInit"
1419− uninit <- rootInit r k $ RootTrigger (subs, rootOccurrence r, k)
1420− writeIORef uninitRef $! uninit
1421− let !subscribed = RootSubscribed
1422− { rootSubscribedKey = k
1423− , rootSubscribedCachedSubscribed = cached
1424− , rootSubscribedOccurrence = getOcc
1425− , rootSubscribedSubscribers = subs
1426− , rootSubscribedUninit = uninit
1427− , rootSubscribedWeakSelf = weakSelf
1428−#ifdef DEBUG_NODEIDS
1429− , rootSubscribedNodeId = unsafeNodeId (k, r, subs)
1430−#endif
1431− }
1432− -- If we die at the same moment that all our children die, they will
1433− -- try to clean us up but will fail because their Weak reference to us
1434− -- will also be dead. So, if we are dying, check if there are any
1435− -- children; since children don't bother cleaning themselves up if
1436− -- their parents are already dead, I don't think there's a race
1437− -- condition here. However, if there are any children, then we can
1438− -- infer that we need to clean ourselves up, so we do.
1439− finalCleanup = do
1440− cs <- readIORef $ _weakBag_children subs
1441− when (not $ IntMap.null cs) (cleanupRootSubscribed subscribed)
1442− writeIORef weakSelf =<< evaluate =<< mkWeakPtr subscribed (Just finalCleanup)
1443− 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
1444− occ <- getOcc
1445− return (sln, subscribed, occ)
1446−
1447−#ifdef USE_TEMPLATE_HASKELL
1448−{-# ANN cleanupRootSubscribed "HLint: ignore Redundant bracket" #-}
1449−#endif
1450−cleanupRootSubscribed :: RootSubscribed x a -> IO ()
1451−cleanupRootSubscribed self@RootSubscribed { rootSubscribedKey = k, rootSubscribedCachedSubscribed = cached } = do
1452− rootSubscribedUninit self
1453− modifyIORef' cached $ DMap.delete k
1454−
1455−{-# INLINE subscribeRootSubscribed #-}
1456−subscribeRootSubscribed :: RootSubscribed x a -> Subscriber x a -> IO WeakBagTicket
1457−subscribeRootSubscribed subscribed sub = WeakBag.insert sub (rootSubscribedSubscribers subscribed) (rootSubscribedWeakSelf subscribed) cleanupRootSubscribed
1458−
1459−newtype EventSelectorInt x a = EventSelectorInt { selectInt :: Int -> Event x a }
1460−
1461−data FanInt x a = FanInt
1462− { _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
1463− , _fanInt_subscriptionRef :: {-# UNPACK #-} !(IORef (EventSubscription x)) -- This should have a valid subscription iff subscribers is non-empty
1464− , _fanInt_occRef :: {-# UNPACK #-} !(IORef (IntMap a))
1465− }
1466−
1467−newFanInt :: IO (FanInt x a)
1468−newFanInt = do
1469− 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
1470− subscriptionRef <- newIORef $ error "fanInt: no subscription"
1471− occRef <- newIORef $ error "fanInt: no occurrence"
1472− return $ FanInt
1473− { _fanInt_subscribers = subscribers
1474− , _fanInt_subscriptionRef = subscriptionRef
1475− , _fanInt_occRef = occRef
1476− }
1477−
1478−{-# NOINLINE unsafeNewFanInt #-}
1479−unsafeNewFanInt :: b -> FanInt x a
1480−unsafeNewFanInt b = unsafePerformIO $ do
1481− touch b
1482− newFanInt
1483−
1484−fanInt :: HasSpiderTimeline x => Event x (IntMap a) -> EventSelectorInt x a
1485−fanInt p =
1486− let self = unsafeNewFanInt p
1487− in EventSelectorInt $ \k -> Event $ \sub -> do
1488− isEmpty <- liftIO $ FastMutableIntMap.isEmpty (_fanInt_subscribers self)
1489− when isEmpty $ do -- This is the first subscriber, so we need to subscribe to our input
1490− (subscription, parentOcc) <- subscribeAndRead p $ Subscriber
1491− { subscriberPropagate = \m -> do
1492− liftIO $ writeIORef (_fanInt_occRef self) m
1493− scheduleIntClear $ _fanInt_occRef self
1494− FastMutableIntMap.forIntersectionWithImmutable_ (_fanInt_subscribers self) m $ \b v -> do --TODO: Do we need to know that no subscribers are being added as we traverse?
1495− FastWeakBag.traverse b $ \s -> do
1496− subscriberPropagate s v
1497− , subscriberInvalidateHeight = \old -> do
1498− FastMutableIntMap.for_ (_fanInt_subscribers self) $ \b -> do
1499− FastWeakBag.traverse b $ \s -> do
1500− subscriberInvalidateHeight s old
1501− , subscriberRecalculateHeight = \new -> do
1502− FastMutableIntMap.for_ (_fanInt_subscribers self) $ \b -> do
1503− FastWeakBag.traverse b $ \s -> do
1504− subscriberRecalculateHeight s new
1505− }
1506− liftIO $ do
1507− writeIORef (_fanInt_subscriptionRef self) subscription
1508− writeIORef (_fanInt_occRef self) $ fromMaybe IntMap.empty parentOcc
1509− scheduleIntClear $ _fanInt_occRef self
1510− liftIO $ do
1511− b <- FastMutableIntMap.lookup (_fanInt_subscribers self) k >>= \case
1512− Nothing -> do
1513− b <- FastWeakBag.empty
1514− FastMutableIntMap.insert (_fanInt_subscribers self) k b
1515− return b
1516− Just b -> return b
1517− t <- liftIO $ FastWeakBag.insert sub b
1518− currentOcc <- readIORef (_fanInt_occRef self)
1519− (EventSubscription _ (EventSubscribed !heightRef _)) <- readIORef (_fanInt_subscriptionRef self)
1520− return (EventSubscription (FastWeakBag.remove t) $! EventSubscribed heightRef $! toAny (_fanInt_subscriptionRef self, t), IntMap.lookup k currentOcc)
1521−
1522−{-# INLINABLE getFanSubscribed #-}
1523−getFanSubscribed :: (HasSpiderTimeline x, GCompare k) => k a -> Fan x k -> Subscriber x a -> EventM x (WeakBagTicket, FanSubscribed x k, Maybe a)
1524−getFanSubscribed k f sub = do
1525− mSubscribed <- liftIO $ readIORef $ fanSubscribed f
1526− case mSubscribed of
1527− Just subscribed -> {-# SCC "hitFan" #-} liftIO $ do
1528− sln <- subscribeFanSubscribed k subscribed sub
1529− occ <- readIORef $ fanSubscribedOccurrence subscribed
1530− return (sln, subscribed, coerce $ DMap.lookup k =<< occ)
1531− Nothing -> {-# SCC "missFan" #-} do
1532− subscribedRef <- liftIO $ newIORef $ error "getFanSubscribed: subscribedRef not yet initialized"
1533− subscribedUnsafe <- liftIO $ unsafeInterleaveIO $ readIORef subscribedRef
1534− s <- liftIO $ newSubscriberFan subscribedUnsafe
1535− (subscription, parentOcc) <- subscribeAndRead (fanParent f) s
1536− weakSelf <- liftIO $ newIORef $ error "getFanSubscribed: weakSelf not yet initialized"
1537− (subsForK, slnForSub) <- liftIO $ WeakBag.singleton sub weakSelf cleanupFanSubscribed
1538− subscribersRef <- liftIO $ newIORef $ error "getFanSubscribed: subscribersRef not yet initialized"
1539− occRef <- liftIO $ newIORef parentOcc
1540− when (isJust parentOcc) $ scheduleClear occRef
1541− let subscribed = FanSubscribed
1542− { fanSubscribedCachedSubscribed = fanSubscribed f
1543− , fanSubscribedOccurrence = occRef
1544− , fanSubscribedParent = subscription
1545− , fanSubscribedSubscribers = subscribersRef
1546−#ifdef DEBUG_NODEIDS
1547− , fanSubscribedNodeId = unsafeNodeId f
1548−#endif
1549− }
1550− let !self = (k, subscribed)
1551− liftIO $ writeIORef subscribersRef $! DMap.singleton k $ FanSubscribedChildren subsForK self weakSelf
1552− liftIO $ writeIORef weakSelf =<< evaluate =<< mkWeakPtrWithDebug self "FanSubscribed"
1553− liftIO $ writeIORef subscribedRef $! subscribed
1554− liftIO $ writeIORef (fanSubscribed f) $ Just subscribed
1555− return (slnForSub, subscribed, coerce $ DMap.lookup k =<< parentOcc)
1556−
1557−cleanupFanSubscribed :: GCompare k => (k a, FanSubscribed x k) -> IO ()
1558−cleanupFanSubscribed (k, subscribed) = do
1559− subscribers <- readIORef $ fanSubscribedSubscribers subscribed
1560− let reducedSubscribers = DMap.delete k subscribers
1561− if DMap.null reducedSubscribers
1562− then do
1563− unsubscribe $ fanSubscribedParent subscribed
1564− -- Not necessary in this case, because this whole FanSubscribed is dead: writeIORef (fanSubscribedSubscribers subscribed) reducedSubscribers
1565− writeIORef (fanSubscribedCachedSubscribed subscribed) Nothing
1566− else writeIORef (fanSubscribedSubscribers subscribed) $! reducedSubscribers
1567−
1568−{-# INLINE subscribeFanSubscribed #-}
1569−subscribeFanSubscribed :: GCompare k => k a -> FanSubscribed x k -> Subscriber x a -> IO WeakBagTicket
1570−subscribeFanSubscribed k subscribed sub = do
1571− subscribers <- readIORef $ fanSubscribedSubscribers subscribed
1572− case DMap.lookup k subscribers of
1573− Nothing -> {-# SCC "missSubscribeFanSubscribed" #-} do
1574− let !self = (k, subscribed)
1575− weakSelf <- newIORef =<< mkWeakPtrWithDebug self "FanSubscribed"
1576− (list, sln) <- WeakBag.singleton sub weakSelf cleanupFanSubscribed
1577− 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
1578− return sln
1579− Just (FanSubscribedChildren list _ weakSelf) -> {-# SCC "hitSubscribeFanSubscribed" #-} WeakBag.insert sub list weakSelf cleanupFanSubscribed
1580−
1581−{-# INLINABLE getSwitchSubscribed #-}
1582−getSwitchSubscribed :: HasSpiderTimeline x => Switch x a -> Subscriber x a -> EventM x (WeakBagTicket, SwitchSubscribed x a, Maybe a)
1583−getSwitchSubscribed s sub = do
1584− mSubscribed <- liftIO $ readIORef $ switchSubscribed s
1585− case mSubscribed of
1586− Just subscribed -> {-# SCC "hitSwitch" #-} liftIO $ do
1587− sln <- subscribeSwitchSubscribed subscribed sub
1588− occ <- readIORef $ switchSubscribedOccurrence subscribed
1589− return (sln, subscribed, occ)
1590− Nothing -> {-# SCC "missSwitch" #-} do
1591− subscribedRef <- liftIO $ newIORef $ error "getSwitchSubscribed: subscribed has not yet been created"
1592− subscribedUnsafe <- liftIO $ unsafeInterleaveIO $ readIORef subscribedRef
1593− i <- liftIO $ newInvalidatorSwitch subscribedUnsafe
1594− mySub <- liftIO $ newSubscriberSwitch subscribedUnsafe
1595− wi <- liftIO $ mkWeakPtrWithDebug i "InvalidatorSwitch"
1596− wiRef <- liftIO $ newIORef wi
1597− parentsRef <- liftIO $ newIORef [] --TODO: This should be unnecessary, because it will always be filled with just the single parent behavior
1598− holdInits <- getDeferralQueue
1599− e <- liftIO $ runBehaviorM (readBehaviorTracked (switchParent s)) (Just (wi, parentsRef)) holdInits
1600− (subscription@(EventSubscription _ subd), parentOcc) <- subscribeAndRead e mySub
1601− heightRef <- liftIO $ newIORef =<< getEventSubscribedHeight subd
1602− subscriptionRef <- liftIO $ newIORef subscription
1603− occRef <- liftIO $ newIORef parentOcc
1604− when (isJust parentOcc) $ scheduleClear occRef
1605− weakSelf <- liftIO $ newIORef $ error "getSwitchSubscribed: weakSelf not yet initialized"
1606− (subs, slnForSub) <- liftIO $ WeakBag.singleton sub weakSelf cleanupSwitchSubscribed
1607− let !subscribed = SwitchSubscribed
1608− { switchSubscribedCachedSubscribed = switchSubscribed s
1609− , switchSubscribedOccurrence = occRef
1610− , switchSubscribedHeight = heightRef
1611− , switchSubscribedSubscribers = subs
1612− , switchSubscribedOwnInvalidator = i
1613− , switchSubscribedOwnWeakInvalidator = wiRef
1614− , switchSubscribedBehaviorParents = parentsRef
1615− , switchSubscribedParent = switchParent s
1616− , switchSubscribedCurrentParent = subscriptionRef
1617− , switchSubscribedWeakSelf = weakSelf
1618−#ifdef DEBUG_NODEIDS
1619− , switchSubscribedNodeId = unsafeNodeId s
1620−#endif
1621− }
1622− liftIO $ writeIORef weakSelf =<< evaluate =<< mkWeakPtrWithDebug subscribed "switchSubscribedWeakSelf"
1623− liftIO $ writeIORef subscribedRef $! subscribed
1624− liftIO $ writeIORef (switchSubscribed s) $ Just subscribed
1625− return (slnForSub, subscribed, parentOcc)
1626−
1627−cleanupSwitchSubscribed :: SwitchSubscribed x a -> IO ()
1628−cleanupSwitchSubscribed subscribed = do
1629− unsubscribe =<< readIORef (switchSubscribedCurrentParent subscribed)
1630− finalize =<< readIORef (switchSubscribedOwnWeakInvalidator subscribed) -- We don't need to get invalidated if we're dead
1631− writeIORef (switchSubscribedCachedSubscribed subscribed) Nothing
1632−
1633−{-# INLINE subscribeSwitchSubscribed #-}
1634−subscribeSwitchSubscribed :: SwitchSubscribed x a -> Subscriber x a -> IO WeakBagTicket
1635−subscribeSwitchSubscribed subscribed sub = WeakBag.insert sub (switchSubscribedSubscribers subscribed) (switchSubscribedWeakSelf subscribed) cleanupSwitchSubscribed
1636−
1637−{-# INLINABLE getCoincidenceSubscribed #-}
1638−getCoincidenceSubscribed :: forall x a. HasSpiderTimeline x => Coincidence x a -> Subscriber x a -> EventM x (WeakBagTicket, CoincidenceSubscribed x a, Maybe a)
1639−getCoincidenceSubscribed c sub = do
1640− mSubscribed <- liftIO $ readIORef $ coincidenceSubscribed c
1641− case mSubscribed of
1642− Just subscribed -> {-# SCC "hitCoincidence" #-} liftIO $ do
1643− sln <- subscribeCoincidenceSubscribed subscribed sub
1644− occ <- readIORef $ coincidenceSubscribedOccurrence subscribed
1645− return (sln, subscribed, occ)
1646− Nothing -> {-# SCC "missCoincidence" #-} do
1647− subscribedRef <- liftIO $ newIORef $ error "getCoincidenceSubscribed: subscribed has not yet been created"
1648− subscribedUnsafe <- liftIO $ unsafeInterleaveIO $ readIORef subscribedRef
1649− subOuter <- liftIO $ newSubscriberCoincidenceOuter subscribedUnsafe
1650− (outerSubscription@(EventSubscription _ outerSubd), outerOcc) <- subscribeAndRead (coincidenceParent c) subOuter
1651− outerHeight <- liftIO $ getEventSubscribedHeight outerSubd
1652− (occ, height, mInnerSubd) <- case outerOcc of
1653− Nothing -> return (Nothing, outerHeight, Nothing)
1654− Just o -> do
1655− (occ, height, innerSubd) <- subscribeCoincidenceInner o outerHeight subscribedUnsafe
1656− return (occ, height, Just innerSubd)
1657− occRef <- liftIO $ newIORef occ
1658− when (isJust occ) $ scheduleClear occRef
1659− heightRef <- liftIO $ newIORef height
1660− innerSubdRef <- liftIO $ newIORef mInnerSubd
1661− scheduleClear innerSubdRef
1662− weakSelf <- liftIO $ newIORef $ error "getCoincidenceSubscribed: weakSelf not yet implemented"
1663− (subs, slnForSub) <- liftIO $ WeakBag.singleton sub weakSelf cleanupCoincidenceSubscribed
1664− let subscribed = CoincidenceSubscribed
1665− { coincidenceSubscribedCachedSubscribed = coincidenceSubscribed c
1666− , coincidenceSubscribedOccurrence = occRef
1667− , coincidenceSubscribedHeight = heightRef
1668− , coincidenceSubscribedSubscribers = subs
1669− , coincidenceSubscribedOuter = subOuter
1670− , coincidenceSubscribedOuterParent = outerSubscription
1671− , coincidenceSubscribedInnerParent = innerSubdRef
1672− , coincidenceSubscribedWeakSelf = weakSelf
1673−#ifdef DEBUG_NODEIDS
1674− , coincidenceSubscribedNodeId = unsafeNodeId c
1675−#endif
1676− }
1677− liftIO $ writeIORef weakSelf =<< evaluate =<< mkWeakPtrWithDebug subscribed "CoincidenceSubscribed"
1678− liftIO $ writeIORef subscribedRef $! subscribed
1679− liftIO $ writeIORef (coincidenceSubscribed c) $ Just subscribed
1680− return (slnForSub, subscribed, occ)
1681−
1682−cleanupCoincidenceSubscribed :: CoincidenceSubscribed x a -> IO ()
1683−cleanupCoincidenceSubscribed subscribed = do
1684− unsubscribe $ coincidenceSubscribedOuterParent subscribed
1685− writeIORef (coincidenceSubscribedCachedSubscribed subscribed) Nothing
1686−
1687−{-# INLINE subscribeCoincidenceSubscribed #-}
1688−subscribeCoincidenceSubscribed :: CoincidenceSubscribed x a -> Subscriber x a -> IO WeakBagTicket
1689−subscribeCoincidenceSubscribed subscribed sub = WeakBag.insert sub (coincidenceSubscribedSubscribers subscribed) (coincidenceSubscribedWeakSelf subscribed) cleanupCoincidenceSubscribed
1690−
1691−{-# INLINE merge #-}
1692−merge :: forall k x. (HasSpiderTimeline x, GCompare k) => Dynamic x (PatchDMap k (Event x)) -> Event x (DMap k Identity)
1693−merge d = cacheEvent (mergeCheap d)
1694−
1695−{-# INLINE mergeWithMove #-}
1696−mergeWithMove :: forall k x. (HasSpiderTimeline x, GCompare k) => Dynamic x (PatchDMapWithMove k (Event x)) -> Event x (DMap k Identity)
1697−mergeWithMove d = cacheEvent (mergeCheapWithMove d)
1698−
1699−{-# INLINE [1] mergeCheap #-}
1700−mergeCheap :: forall k x. (HasSpiderTimeline x, GCompare k) => Dynamic x (PatchDMap k (Event x)) -> Event x (DMap k Identity)
1701−mergeCheap = mergeCheap' getInitialSubscribers updateMe destroy
1702− where
1703− updateMe :: MergeUpdateFunc k x (PatchDMap k (Event x)) (MergeSubscribedParent x)
1704− updateMe subscriber heightBagRef oldParents (PatchDMap p) = do
1705− let f (subscriptionsToKill, ps) (k :=> ComposeMaybe me) = do
1706− (mOldSubd, newPs) <- case me of
1707− Nothing -> return $ DMap.updateLookupWithKey (\_ _ -> Nothing) k ps
1708− Just e -> do
1709− let s = subscriber $ return k
1710− subscription@(EventSubscription _ subd) <- subscribe e s
1711− newParentHeight <- liftIO $ getEventSubscribedHeight subd
1712− let newParent = MergeSubscribedParent subscription
1713− liftIO $ modifyIORef' heightBagRef $ heightBagAdd newParentHeight
1714− return $ DMap.insertLookupWithKey' (\_ new _ -> new) k newParent ps
1715− forM_ mOldSubd $ \oldSubd -> do
1716− oldHeight <- liftIO $ getEventSubscribedHeight $ _eventSubscription_subscribed $ unMergeSubscribedParent oldSubd
1717− liftIO $ modifyIORef heightBagRef $ heightBagRemove oldHeight
1718− return (maybeToList (unMergeSubscribedParent <$> mOldSubd) ++ subscriptionsToKill, newPs)
1719− foldM f ([], oldParents) $ DMap.toList p
1720− getInitialSubscribers :: MergeInitFunc k x (MergeSubscribedParent x)
1721− getInitialSubscribers initialParents subscriber = do
1722− subscribers <- forM (DMap.toList initialParents) $ \(k :=> e) -> do
1723− let s = subscriber $ return k
1724− (subscription@(EventSubscription _ parentSubd), parentOcc) <- subscribeAndRead e s
1725− height <- liftIO $ getEventSubscribedHeight parentSubd
1726− return (fmap (\x -> k :=> Identity x) parentOcc, height, k :=> MergeSubscribedParent subscription)
1727− return ( DMap.fromDistinctAscList $ mapMaybe (\(x, _, _) -> x) subscribers
1728− , fmap (\(_, h, _) -> h) subscribers --TODO: Assert that there's no invalidHeight in here
1729− , DMap.fromDistinctAscList $ map (\(_, _, x) -> x) subscribers
1730− )
1731− destroy :: MergeDestroyFunc k (MergeSubscribedParent x)
1732− destroy s = forM_ (DMap.toList s) $ \(_ :=> MergeSubscribedParent sub) -> unsubscribe sub
1733−
1734−{-# INLINE [1] mergeCheapWithMove #-}
1735−mergeCheapWithMove :: forall k x. (HasSpiderTimeline x, GCompare k) => Dynamic x (PatchDMapWithMove k (Event x)) -> Event x (DMap k Identity)
1736−mergeCheapWithMove = mergeCheap' getInitialSubscribers updateMe destroy
1737− where
1738− updateMe :: MergeUpdateFunc k x (PatchDMapWithMove k (Event x)) (MergeSubscribedParentWithMove x k)
1739− updateMe subscriber heightBagRef oldParents p = do
1740− -- Prepare new parents for insertion
1741− let subscribeParent :: forall a. k a -> Event x a -> EventM x (MergeSubscribedParentWithMove x k a)
1742− subscribeParent k e = do
1743− keyRef <- liftIO $ newIORef k
1744− let s = subscriber $ liftIO $ readIORef keyRef
1745− subscription@(EventSubscription _ subd) <- subscribe e s
1746− liftIO $ do
1747− newParentHeight <- getEventSubscribedHeight subd
1748− modifyIORef' heightBagRef $ heightBagAdd newParentHeight
1749− return $ MergeSubscribedParentWithMove subscription keyRef
1750− p' <- PatchDMapWithMove.traversePatchDMapWithMoveWithKey subscribeParent p
1751− -- Collect old parents for deletion and update the keys of moved parents
1752− let moveOrDelete :: forall a. k a -> PatchDMapWithMove.NodeInfo k (Event x) a -> MergeSubscribedParentWithMove x k a -> Constant (EventM x (Maybe (EventSubscription x))) a
1753− moveOrDelete _ ni parent = Constant $ case getComposeMaybe $ PatchDMapWithMove._nodeInfo_to ni of
1754− Nothing -> do
1755− oldHeight <- liftIO $ getEventSubscribedHeight $ _eventSubscription_subscribed $ _mergeSubscribedParentWithMove_subscription parent
1756− liftIO $ modifyIORef heightBagRef $ heightBagRemove oldHeight
1757− return $ Just $ _mergeSubscribedParentWithMove_subscription parent
1758− Just toKey -> do
1759− liftIO $ writeIORef (_mergeSubscribedParentWithMove_key parent) $! toKey
1760− return Nothing
1761− toDelete <- fmap catMaybes $ mapM (\(_ :=> v) -> getConstant v) $ DMap.toList $ DMap.intersectionWithKey moveOrDelete (unPatchDMapWithMove p) oldParents
1762− return (toDelete, applyAlways p' oldParents)
1763− getInitialSubscribers :: MergeInitFunc k x (MergeSubscribedParentWithMove x k)
1764− getInitialSubscribers initialParents subscriber = do
1765− subscribers <- forM (DMap.toList initialParents) $ \(k :=> e) -> do
1766− keyRef <- liftIO $ newIORef k
1767− let s = subscriber $ liftIO $ readIORef keyRef
1768− (subscription@(EventSubscription _ parentSubd), parentOcc) <- subscribeAndRead e s
1769− height <- liftIO $ getEventSubscribedHeight parentSubd
1770− return (fmap (\x -> k :=> Identity x) parentOcc, height, k :=> MergeSubscribedParentWithMove subscription keyRef)
1771− return ( DMap.fromDistinctAscList $ mapMaybe (\(x, _, _) -> x) subscribers
1772− , fmap (\(_, h, _) -> h) subscribers --TODO: Assert that there's no invalidHeight in here
1773− , DMap.fromDistinctAscList $ map (\(_, _, x) -> x) subscribers
1774− )
1775− destroy :: MergeDestroyFunc k (MergeSubscribedParentWithMove x k)
1776− destroy s = forM_ (DMap.toList s) $ \(_ :=> MergeSubscribedParentWithMove sub _) -> unsubscribe sub
1777−
1778−type MergeUpdateFunc k x p s
1779− = (forall a. EventM x (k a) -> Subscriber x a)
1780− -> IORef HeightBag
1781− -> DMap k s
1782− -> p
1783− -> EventM x ([EventSubscription x], DMap k s)
1784−
1785−type MergeInitFunc k x s
1786− = DMap k (Event x)
1787− -> (forall a. EventM x (k a) -> Subscriber x a)
1788− -> EventM x (DMap k Identity, [Height], DMap k s)
1789−
1790−type MergeDestroyFunc k s
1791− = DMap k s
1792− -> IO ()
1793−
1794−data Merge x k s = Merge
1795− { _merge_parentsRef :: {-# UNPACK #-} !(IORef (DMap k s))
1796− , _merge_heightBagRef :: {-# UNPACK #-} !(IORef HeightBag)
1797− , _merge_heightRef :: {-# UNPACK #-} !(IORef Height)
1798− , _merge_sub :: {-# UNPACK #-} !(Subscriber x (DMap k Identity))
1799− , _merge_accumRef :: {-# UNPACK #-} !(IORef (DMap k Identity))
1800− }
1801−
1802−invalidateMergeHeight :: Merge x k s -> IO ()
1803−invalidateMergeHeight m = invalidateMergeHeight' (_merge_heightRef m) (_merge_sub m)
1804−
1805−invalidateMergeHeight' :: IORef Height -> Subscriber x a -> IO ()
1806−invalidateMergeHeight' heightRef sub = do
1807− oldHeight <- readIORef heightRef
1808− when (oldHeight /= invalidHeight) $ do -- If the height used to be valid, it must be invalid now; we should never have *more* heights than we have parents
1809− writeIORef heightRef $! invalidHeight
1810− subscriberInvalidateHeight sub oldHeight
1811−
1812−
1813−revalidateMergeHeight :: Merge x k s -> IO ()
1814−revalidateMergeHeight m = do
1815− currentHeight <- readIORef $ _merge_heightRef m
1816− when (currentHeight == invalidHeight) $ do -- revalidateMergeHeight may be called multiple times; perhaps the's a way to finesse it to avoid this check
1817− heights <- readIORef $ _merge_heightBagRef m
1818− parents <- readIORef $ _merge_parentsRef m
1819− -- When the number of heights in the bag reaches the number of parents, we should have a valid height
1820− case heightBagSize heights `compare` DMap.size parents of
1821− LT -> return ()
1822− EQ -> do
1823− let height = succHeight $ heightBagMax heights
1824− when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: height: " <> show height
1825− writeIORef (_merge_heightRef m) $! height
1826− subscriberRecalculateHeight (_merge_sub m) height
1827− GT -> error $ "revalidateMergeHeight: more heights (" <> show (heightBagSize heights) <> ") than parents (" <> show (DMap.size parents) <> ") for Merge"
1828−
1829−scheduleMergeSelf :: HasSpiderTimeline x => Merge x k s -> Height -> EventM x ()
1830−scheduleMergeSelf m height = scheduleMerge' height (_merge_heightRef m) $ do
1831− vals <- liftIO $ readIORef $ _merge_accumRef m
1832− liftIO $ writeIORef (_merge_accumRef m) $! DMap.empty -- Once we're done with this, we can clear it immediately, because if there's a cacheEvent in front of us, it'll handle subsequent subscribers, and if not, we won't get subsequent subscribers
1833− --TODO: Assert that m is not empty
1834− subscriberPropagate (_merge_sub m) vals
1835−
1836−mergeSubscriber :: forall x k s a. (HasSpiderTimeline x, GCompare k) => Merge x k s -> EventM x (k a) -> Subscriber x a
1837−mergeSubscriber m getKey = Subscriber
1838− { subscriberPropagate = \a -> do
1839− oldM <- liftIO $ readIORef $ _merge_accumRef m
1840− k <- getKey
1841− let newM = DMap.insertWith (error $ "Same key fired multiple times for Merge") k (Identity a) oldM
1842− tracePropagate (Proxy :: Proxy x) $ " DMap.size oldM = " <> show (DMap.size oldM) <> "; DMap.size newM = " <> show (DMap.size newM)
1843− liftIO $ writeIORef (_merge_accumRef m) $! newM
1844− when (DMap.null oldM) $ do -- Only schedule the firing once
1845− height <- liftIO $ readIORef $ _merge_heightRef m
1846− --TODO: assertions about height
1847− currentHeight <- getCurrentHeight
1848− when (height <= currentHeight) $ do
1849− if height /= invalidHeight
1850− then do
1851− myStack <- liftIO $ whoCreatedIORef undefined --TODO
1852− error $ "Height (" ++ show height ++ ") is not greater than current height (" ++ show currentHeight ++ ")\n" ++ unlines (reverse myStack)
1853− else liftIO $ do
1854−#ifdef DEBUG_CYCLES
1855− nodesInvolvedInCycle <- walkInvalidHeightParents $ eventSubscribedMerge subscribed
1856− stacks <- forM nodesInvolvedInCycle $ \(Some.This es) -> whoCreatedEventSubscribed es
1857− let cycleInfo = ":\n" <> drawForest (listsToForest stacks)
1858−#else
1859− let cycleInfo = ""
1860−#endif
1861− error $ "Causality loop found" <> cycleInfo
1862− scheduleMergeSelf m height
1863− , subscriberInvalidateHeight = \old -> do --TODO: When removing a parent doesn't actually change the height, maybe we can avoid invalidating
1864− modifyIORef' (_merge_heightBagRef m) $ heightBagRemove old
1865− invalidateMergeHeight m
1866− , subscriberRecalculateHeight = \new -> do
1867− modifyIORef' (_merge_heightBagRef m) $ heightBagAdd new
1868− revalidateMergeHeight m
1869− }
1870−
1871−--TODO: Be able to run as much of this as possible promptly
1872−updateMerge :: (HasSpiderTimeline x, GCompare k) => Merge x k s -> MergeUpdateFunc k x p s -> p -> SomeMergeUpdate x
1873−updateMerge m updateFunc p = SomeMergeUpdate updateMe (invalidateMergeHeight m) (revalidateMergeHeight m)
1874− where updateMe = do
1875− oldParents <- liftIO $ readIORef $ _merge_parentsRef m
1876− (subscriptionsToKill, newParents) <- updateFunc (mergeSubscriber m) (_merge_heightBagRef m) oldParents p
1877− liftIO $ writeIORef (_merge_parentsRef m) $! newParents
1878− return subscriptionsToKill
1879−
1880−{-# INLINE mergeCheap' #-}
1881−mergeCheap' :: forall k x p s. (HasSpiderTimeline x, GCompare k, PatchTarget p ~ DMap k (Event x)) => MergeInitFunc k x s -> MergeUpdateFunc k x p s -> MergeDestroyFunc k s -> Dynamic x p -> Event x (DMap k Identity)
1882−mergeCheap' getInitialSubscribers updateFunc destroy d = Event $ \sub -> do
1883− initialParents <- readBehaviorUntracked $ dynamicCurrent d
1884− accumRef <- liftIO $ newIORef $ error "merge: accumRef not yet initialized"
1885− heightRef <- liftIO $ newIORef $ error "merge: heightRef not yet initialized"
1886− heightBagRef <- liftIO $ newIORef $ error "merge: heightBagRef not yet initialized"
1887− parentsRef :: IORef (DMap k s) <- liftIO $ newIORef $ error "merge: parentsRef not yet initialized"
1888− let m = Merge
1889− { _merge_parentsRef = parentsRef
1890− , _merge_heightBagRef = heightBagRef
1891− , _merge_heightRef = heightRef
1892− , _merge_sub = sub
1893− , _merge_accumRef = accumRef
1894− }
1895− (dm, heights, initialParentState) <- getInitialSubscribers initialParents $ mergeSubscriber m
1896− let myHeightBag = heightBagFromList $ filter (/= invalidHeight) heights
1897− myHeight = if invalidHeight `elem` heights
1898− then invalidHeight
1899− else succHeight $ heightBagMax myHeightBag
1900− currentHeight <- getCurrentHeight
1901− let (occ, accum) = if currentHeight >= myHeight -- If we should have fired by now
1902− then (if DMap.null dm then Nothing else Just dm, DMap.empty)
1903− else (Nothing, dm)
1904− unless (DMap.null accum) $ do
1905− scheduleMergeSelf m myHeight
1906− liftIO $ writeIORef accumRef $! accum
1907− liftIO $ writeIORef heightRef $! myHeight
1908− liftIO $ writeIORef heightBagRef $! myHeightBag
1909− changeSubdRef <- liftIO $ newIORef $ error "getMergeSubscribed: changeSubdRef not yet initialized"
1910− liftIO $ writeIORef parentsRef $! initialParentState
1911− defer $ SomeMergeInit $ do
1912− let s = Subscriber
1913− { subscriberPropagate = \a -> {-# SCC "traverseMergeChange" #-} do
1914− tracePropagate (Proxy :: Proxy x) $ "SubscriberMerge/Change"
1915− defer $ updateMerge m updateFunc a
1916− , subscriberInvalidateHeight = \_ -> return ()
1917− , subscriberRecalculateHeight = \_ -> return ()
1918− }
1919− (changeSubscription, change) <- subscribeAndRead (dynamicUpdated d) s
1920− forM_ change $ \c -> defer $ updateMerge m updateFunc c
1921− -- We explicitly hold on to the unsubscribe function from subscribing to the update event.
1922− -- If we don't do this, there are certain cases where mergeCheap will fail to properly retain
1923− -- its subscription.
1924− liftIO $ writeIORef changeSubdRef (s, changeSubscription)
1925− let unsubscribeAll = destroy =<< readIORef parentsRef
1926− return ( EventSubscription unsubscribeAll $ EventSubscribed heightRef $ toAny (parentsRef, changeSubdRef)
1927− , occ
1928− )
1929−
1930−mergeInt :: forall x a. (HasSpiderTimeline x) => Dynamic x (PatchIntMap (Event x a)) -> Event x (IntMap a)
1931−mergeInt = cacheEvent . mergeIntCheap
1932−
1933−{-# INLINABLE mergeIntCheap #-}
1934−mergeIntCheap :: forall x a. (HasSpiderTimeline x) => Dynamic x (PatchIntMap (Event x a)) -> Event x (IntMap a)
1935−mergeIntCheap d = Event $ \sub -> do
1936− initialParents <- readBehaviorUntracked $ dynamicCurrent d
1937− accum <- liftIO $ FastMutableIntMap.newEmpty
1938− heightRef <- liftIO $ newIORef zeroHeight
1939− heightBagRef <- liftIO $ newIORef heightBagEmpty
1940− parents <- liftIO $ FastMutableIntMap.newEmpty
1941− let scheduleSelf = do
1942− height <- liftIO $ readIORef $ heightRef
1943− scheduleMerge' height heightRef $ do
1944− vals <- liftIO $ FastMutableIntMap.getFrozenAndClear accum
1945− subscriberPropagate sub vals
1946− invalidateMyHeight = do
1947− invalidateMergeHeight' heightRef sub
1948− recalculateMyHeight = do
1949− currentHeight <- readIORef heightRef
1950− 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?
1951− heights <- readIORef heightBagRef
1952− numParents <- FastMutableIntMap.size parents
1953− case heightBagSize heights `compare` numParents of
1954− LT -> return ()
1955− EQ -> do
1956− let height = succHeight $ heightBagMax heights
1957− when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: height: " <> show height
1958− writeIORef heightRef $! height
1959− subscriberRecalculateHeight sub height
1960− GT -> error $ "revalidateMergeHeight: more heights (" <> show (heightBagSize heights) <> ") than parents (" <> show numParents <> ") for Merge"
1961− mySubscriber k = Subscriber
1962− { subscriberPropagate = \a -> do
1963− wasEmpty <- liftIO $ FastMutableIntMap.isEmpty accum
1964− liftIO $ FastMutableIntMap.insert accum k a
1965− when wasEmpty scheduleSelf
1966− , subscriberInvalidateHeight = \old -> do
1967− modifyIORef' heightBagRef $ heightBagRemove old
1968− invalidateMyHeight
1969− , subscriberRecalculateHeight = \new -> do
1970− modifyIORef' heightBagRef $ heightBagAdd new
1971− recalculateMyHeight
1972− }
1973− forM_ (IntMap.toList initialParents) $ \(k, p) -> do
1974− (subscription@(EventSubscription _ parentSubd), parentOcc) <- subscribeAndRead p $ mySubscriber k
1975− liftIO $ do
1976− forM_ parentOcc $ FastMutableIntMap.insert accum k
1977− FastMutableIntMap.insert parents k subscription
1978− height <- getEventSubscribedHeight parentSubd
1979− if height == invalidHeight
1980− then writeIORef heightRef invalidHeight
1981− else do
1982− modifyIORef' heightBagRef $ heightBagAdd height
1983− modifyIORef' heightRef $ \oldHeight ->
1984− if oldHeight == invalidHeight
1985− then invalidHeight
1986− else max (succHeight height) oldHeight
1987− myHeight <- liftIO $ readIORef heightRef
1988− currentHeight <- getCurrentHeight
1989− isEmpty <- liftIO $ FastMutableIntMap.isEmpty accum
1990− occ <- if currentHeight >= myHeight -- If we should have fired by now
1991− then if isEmpty
1992− then return Nothing
1993− else liftIO $ Just <$> FastMutableIntMap.getFrozenAndClear accum
1994− else do when (not isEmpty) scheduleSelf -- We have things accumulated, but we shouldn't have fired them yet
1995− return Nothing
1996− changeSubdRef <- liftIO $ newIORef $ error "getMergeSubscribed: changeSubdRef not yet initialized"
1997− defer $ SomeMergeInit $ do
1998− let updateMe a = SomeMergeUpdate u invalidateMyHeight recalculateMyHeight
1999− where
2000− u = do
2001− let f k newParent = do
2002− subscription@(EventSubscription _ subd) <- subscribe newParent $ mySubscriber k
2003− newParentHeight <- liftIO $ getEventSubscribedHeight subd
2004− liftIO $ modifyIORef' heightBagRef $ heightBagAdd newParentHeight
2005− return subscription
2006− newSubscriptions <- FastMutableIntMap.traverseIntMapPatchWithKey f a
2007− oldParents <- liftIO $ FastMutableIntMap.applyPatch parents newSubscriptions
2008− liftIO $ for_ oldParents $ \oldParent -> do
2009− oldParentHeight <- getEventSubscribedHeight $ _eventSubscription_subscribed oldParent
2010− modifyIORef' heightBagRef $ heightBagRemove oldParentHeight
2011− return $ IntMap.elems oldParents
2012− let s = Subscriber
2013− { subscriberPropagate = \a -> {-# SCC "traverseMergeChange" #-} do
2014− tracePropagate (Proxy :: Proxy x) $ "SubscriberMergeInt/Change"
2015− defer $ updateMe a
2016− , subscriberInvalidateHeight = \_ -> return ()
2017− , subscriberRecalculateHeight = \_ -> return ()
2018− }
2019− (changeSubscription, change) <- subscribeAndRead (dynamicUpdated d) s
2020− forM_ change $ \c -> defer $ updateMe c
2021− -- We explicitly hold on to the unsubscribe function from subscribing to the update event.
2022− -- If we don't do this, there are certain cases where mergeCheap will fail to properly retain
2023− -- its subscription.
2024− liftIO $ writeIORef changeSubdRef (s, changeSubscription)
2025− let unsubscribeAll = traverse_ unsubscribe =<< FastMutableIntMap.getFrozenAndClear parents
2026− return ( EventSubscription unsubscribeAll $ EventSubscribed heightRef $ toAny (parents, changeSubdRef)
2027− , occ
2028− )
2029−
2030−newtype EventSelector x k = EventSelector { select :: forall a. k a -> Event x a }
2031−
2032−fan :: (HasSpiderTimeline x, GCompare k) => Event x (DMap k Identity) -> EventSelector x k
2033−fan e =
2034− let f = Fan
2035− { fanParent = e
2036− , fanSubscribed = unsafeNewIORef e Nothing
2037− }
2038− in EventSelector $ \k -> eventFan k f
2039−
2040−runHoldInits :: HasSpiderTimeline x => IORef [SomeHoldInit x] -> IORef [SomeDynInit x] -> IORef [SomeMergeInit x] -> EventM x ()
2041−runHoldInits holdInitRef dynInitRef mergeInitRef = do
2042− holdInits <- liftIO $ readIORef holdInitRef
2043− dynInits <- liftIO $ readIORef dynInitRef
2044− mergeInits <- liftIO $ readIORef mergeInitRef
2045− unless (null holdInits && null dynInits && null mergeInits) $ do
2046− liftIO $ writeIORef holdInitRef []
2047− liftIO $ writeIORef dynInitRef []
2048− liftIO $ writeIORef mergeInitRef []
2049− mapM_ initHold holdInits
2050− mapM_ initDyn dynInits
2051− mapM_ unSomeMergeInit mergeInits
2052− runHoldInits holdInitRef dynInitRef mergeInitRef
2053−
2054−initHold :: HasSpiderTimeline x => SomeHoldInit x -> EventM x ()
2055−initHold (SomeHoldInit h) = void $ getHoldEventSubscription h
2056−
2057−initDyn :: HasSpiderTimeline x => SomeDynInit x -> EventM x ()
2058−initDyn (SomeDynInit d) = void $ getDynHold d
2059−
2060−newEventEnv :: IO (EventEnv x)
2061−newEventEnv = do
2062− toAssignRef <- newIORef [] -- This should only actually get used when events are firing
2063− holdInitRef <- newIORef []
2064− dynInitRef <- newIORef []
2065− mergeUpdateRef <- newIORef []
2066− mergeInitRef <- newIORef []
2067− heightRef <- newIORef zeroHeight
2068− toClearRef <- newIORef []
2069− toClearIntRef <- newIORef []
2070− toClearRootRef <- newIORef []
2071− coincidenceInfosRef <- newIORef []
2072− delayedRef <- newIORef IntMap.empty
2073− return $ EventEnv toAssignRef holdInitRef dynInitRef mergeUpdateRef mergeInitRef toClearRef toClearIntRef toClearRootRef heightRef coincidenceInfosRef delayedRef
2074−
2075−clearEventEnv :: EventEnv x -> IO ()
2076−clearEventEnv (EventEnv toAssignRef holdInitRef dynInitRef mergeUpdateRef mergeInitRef toClearRef toClearIntRef toClearRootRef heightRef coincidenceInfosRef delayedRef) = do
2077− writeIORef toAssignRef []
2078− writeIORef holdInitRef []
2079− writeIORef dynInitRef []
2080− writeIORef mergeUpdateRef []
2081− writeIORef mergeInitRef []
2082− writeIORef heightRef zeroHeight
2083− writeIORef toClearRef []
2084− writeIORef toClearIntRef []
2085− writeIORef toClearRootRef []
2086− writeIORef coincidenceInfosRef []
2087− writeIORef delayedRef IntMap.empty
2088−
2089−-- | Run an event action outside of a frame
2090−runFrame :: forall x a. HasSpiderTimeline x => EventM x a -> SpiderHost x a --TODO: This function also needs to hold the mutex
2091−runFrame a = SpiderHost $ do
2092− let env = _spiderTimeline_eventEnv (spiderTimeline :: SpiderTimelineEnv x)
2093− let go = do
2094− result <- a
2095− 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
2096− return result
2097− result <- runEventM go
2098− toClear <- readIORef $ eventEnvClears env
2099− forM_ toClear $ \(Some.This (Clear ref)) -> {-# SCC "clear" #-} writeIORef ref Nothing
2100− toClearInt <- readIORef $ eventEnvIntClears env
2101− forM_ toClearInt $ \(Some.This (IntClear ref)) -> {-# SCC "intClear" #-} writeIORef ref $! IntMap.empty
2102− toClearRoot <- readIORef $ eventEnvRootClears env
2103− forM_ toClearRoot $ \(Some.This (RootClear ref)) -> {-# SCC "rootClear" #-} writeIORef ref $! DMap.empty
2104− toAssign <- readIORef $ eventEnvAssignments env
2105− toReconnectRef <- newIORef []
2106− coincidenceInfos <- readIORef $ eventEnvResetCoincidences env
2107− forM_ toAssign $ \(SomeAssignment vRef iRef v) -> {-# SCC "assignment" #-} do
2108− writeIORef vRef v
2109− when debugInvalidate $ putStrLn $ "Invalidating Hold"
2110− writeIORef iRef =<< evaluate =<< invalidate toReconnectRef =<< readIORef iRef
2111− mergeUpdates <- readIORef $ eventEnvMergeUpdates env
2112− writeIORef (eventEnvMergeUpdates env) []
2113− when debugPropagate $ putStrLn "Updating merges"
2114− mergeSubscriptionsToKill <- runEventM $ concat <$> mapM _someMergeUpdate_update mergeUpdates
2115− when debugPropagate $ putStrLn "Updating merges done"
2116− toReconnect <- readIORef toReconnectRef
2117− clearEventEnv env
2118− switchSubscriptionsToKill <- forM toReconnect $ \(SomeSwitchSubscribed subscribed) -> {-# SCC "switchSubscribed" #-} do
2119− oldSubscription <- readIORef $ switchSubscribedCurrentParent subscribed
2120− wi <- readIORef $ switchSubscribedOwnWeakInvalidator subscribed
2121− when debugInvalidate $ putStrLn $ "Finalizing invalidator for Switch" <> showNodeId subscribed
2122− finalize wi
2123− i <- evaluate $ switchSubscribedOwnInvalidator subscribed
2124− wi' <- mkWeakPtrWithDebug i "wi'"
2125− writeIORef (switchSubscribedOwnWeakInvalidator subscribed) $! wi'
2126− writeIORef (switchSubscribedBehaviorParents subscribed) []
2127− writeIORef (eventEnvHoldInits env) [] --TODO: Should we reuse this?
2128− e <- runBehaviorM (readBehaviorTracked (switchSubscribedParent subscribed)) (Just (wi', switchSubscribedBehaviorParents subscribed)) $ eventEnvHoldInits env
2129− 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
2130− --TODO: Make sure we touch the pieces of the SwitchSubscribed at the appropriate times
2131− sub <- newSubscriberSwitch subscribed
2132− 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
2133− {-
2134− stackTrace <- liftIO $ fmap renderStack $ ccsToStrings =<< (getCCSOf $! switchSubscribedParent subscribed)
2135− liftIO $ putStrLn $ (++stackTrace) $ "subd' subscribed to " ++ case e of
2136− EventRoot _ -> "EventRoot"
2137− EventNever -> "EventNever"
2138− _ -> "something else"
2139− -}
2140− writeIORef (switchSubscribedCurrentParent subscribed) $! subscription
2141− return oldSubscription
2142− liftIO $ mapM_ unsubscribe mergeSubscriptionsToKill
2143− liftIO $ mapM_ unsubscribe switchSubscriptionsToKill
2144− forM_ toReconnect $ \(SomeSwitchSubscribed subscribed) -> {-# SCC "switchSubscribed" #-} do
2145− EventSubscription _ subd' <- readIORef $ switchSubscribedCurrentParent subscribed
2146− parentHeight <- getEventSubscribedHeight subd'
2147− myHeight <- readIORef $ switchSubscribedHeight subscribed
2148− when (parentHeight /= myHeight) $ do
2149− writeIORef (switchSubscribedHeight subscribed) $! invalidHeight
2150− WeakBag.traverse (switchSubscribedSubscribers subscribed) $ invalidateSubscriberHeight myHeight
2151− 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
2152− forM_ coincidenceInfos $ \(SomeResetCoincidence subscription mcs) -> do
2153− unsubscribe subscription
2154− mapM_ invalidateCoincidenceHeight mcs
2155− forM_ coincidenceInfos $ \(SomeResetCoincidence _ mcs) -> mapM_ recalculateCoincidenceHeight mcs
2156− mapM_ _someMergeUpdate_recalculateHeight mergeUpdates
2157− forM_ toReconnect $ \(SomeSwitchSubscribed subscribed) -> do
2158− height <- calculateSwitchHeight subscribed
2159− updateSwitchHeight height subscribed
2160− return result
2161−
2162−newtype Height = Height { unHeight :: Int } deriving (Show, Read, Eq, Ord, Bounded)
2163−
2164−{-# INLINE zeroHeight #-}
2165−zeroHeight :: Height
2166−zeroHeight = Height 0
2167−
2168−{-# INLINE invalidHeight #-}
2169−invalidHeight :: Height
2170−invalidHeight = Height (-1000)
2171−
2172−#ifdef DEBUG_CYCLES
2173−-- | An invalid height that is currently being traversed, e.g. by walkInvalidHeightParents
2174−{-# INLINE invalidHeightBeingTraversed #-}
2175−invalidHeightBeingTraversed :: Height
2176−invalidHeightBeingTraversed = Height (-1001)
2177−#endif
2178−
2179−{-# INLINE succHeight #-}
2180−succHeight :: Height -> Height
2181−succHeight h@(Height a) =
2182− if h == invalidHeight
2183− then invalidHeight
2184− else Height $ succ a
2185−
2186−invalidateCoincidenceHeight :: CoincidenceSubscribed x a -> IO ()
2187−invalidateCoincidenceHeight subscribed = do
2188− oldHeight <- readIORef $ coincidenceSubscribedHeight subscribed
2189− when (oldHeight /= invalidHeight) $ do
2190− writeIORef (coincidenceSubscribedHeight subscribed) $! invalidHeight
2191− WeakBag.traverse (coincidenceSubscribedSubscribers subscribed) $ invalidateSubscriberHeight oldHeight
2192−
2193−updateSwitchHeight :: Height -> SwitchSubscribed x a -> IO ()
2194−updateSwitchHeight new subscribed = do
2195− oldHeight <- readIORef $ switchSubscribedHeight subscribed
2196− when (oldHeight == invalidHeight) $ do --TODO: This 'when' should probably be an assertion
2197− when (new /= invalidHeight) $ do --TODO: This 'when' should probably be an assertion
2198− writeIORef (switchSubscribedHeight subscribed) $! new
2199− WeakBag.traverse (switchSubscribedSubscribers subscribed) $ recalculateSubscriberHeight new
2200−
2201−recalculateCoincidenceHeight :: CoincidenceSubscribed x a -> IO ()
2202−recalculateCoincidenceHeight subscribed = do
2203− oldHeight <- readIORef $ coincidenceSubscribedHeight subscribed
2204− when (oldHeight == invalidHeight) $ do --TODO: This 'when' should probably be an assertion
2205− height <- calculateCoincidenceHeight subscribed
2206− when (height /= invalidHeight) $ do
2207− writeIORef (coincidenceSubscribedHeight subscribed) $! height
2208− WeakBag.traverse (coincidenceSubscribedSubscribers subscribed) $ recalculateSubscriberHeight height
2209−
2210−calculateSwitchHeight :: SwitchSubscribed x a -> IO Height
2211−calculateSwitchHeight subscribed = getEventSubscribedHeight . _eventSubscription_subscribed =<< readIORef (switchSubscribedCurrentParent subscribed)
2212−
2213−calculateCoincidenceHeight :: CoincidenceSubscribed x a -> IO Height
2214−calculateCoincidenceHeight subscribed = do
2215− outerHeight <- getEventSubscribedHeight $ _eventSubscription_subscribed $ coincidenceSubscribedOuterParent subscribed
2216− innerHeight <- maybe (return zeroHeight) getEventSubscribedHeight =<< readIORef (coincidenceSubscribedInnerParent subscribed)
2217− return $ if outerHeight == invalidHeight || innerHeight == invalidHeight then invalidHeight else max outerHeight innerHeight
2218−
2219−data SomeSwitchSubscribed x = forall a. SomeSwitchSubscribed {-# NOUNPACK #-} (SwitchSubscribed x a)
2220−
2221−invalidate :: IORef [SomeSwitchSubscribed x] -> WeakList (Invalidator x) -> IO (WeakList (Invalidator x))
2222−invalidate toReconnectRef wis = do
2223− forM_ wis $ \wi -> do
2224− mi <- deRefWeak wi
2225− case mi of
2226− Nothing -> do
2227− traceInvalidate "invalidate Dead"
2228− return () --TODO: Should we clean this up here?
2229− Just i -> do
2230− finalize wi -- Once something's invalidated, it doesn't need to hang around; this will change when some things are strict
2231− case i of
2232− InvalidatorPull p -> do
2233− traceInvalidate $ "invalidate: Pull" <> showNodeId p
2234− mVal <- readIORef $ pullValue p
2235− forM_ mVal $ \val -> do
2236− writeIORef (pullValue p) Nothing
2237− writeIORef (pullSubscribedInvalidators val) =<< evaluate =<< invalidate toReconnectRef =<< readIORef (pullSubscribedInvalidators val)
2238− InvalidatorSwitch subscribed -> do
2239− traceInvalidate $ "invalidate: Switch" <> showNodeId subscribed
2240− modifyIORef' toReconnectRef (SomeSwitchSubscribed subscribed :)
2241− 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
2242−
2243−--------------------------------------------------------------------------------
2244−-- Reflex integration
2245−--------------------------------------------------------------------------------
2246−
2247−-- | Designates the default, global Spider timeline
2248−data SpiderTimeline x
2249−type role SpiderTimeline nominal
2250−
2251−-- | The default, global Spider environment
2252−type Spider = SpiderTimeline Global
2253−
2254−instance HasSpiderTimeline x => Reflex.Class.MonadSample (SpiderTimeline x) (EventM x) where
2255− {-# INLINABLE sample #-}
2256− sample (SpiderBehavior b) = readBehaviorUntracked b
2257−
2258−instance HasSpiderTimeline x => Reflex.Class.MonadHold (SpiderTimeline x) (EventM x) where
2259− {-# INLINABLE hold #-}
2260− hold = holdSpiderEventM
2261− {-# INLINABLE holdDyn #-}
2262− holdDyn = holdDynSpiderEventM
2263− {-# INLINABLE holdIncremental #-}
2264− holdIncremental = holdIncrementalSpiderEventM
2265− {-# INLINABLE buildDynamic #-}
2266− buildDynamic = buildDynamicSpiderEventM
2267− {-# INLINABLE headE #-}
2268− headE = R.slowHeadE
2269−-- headE (SpiderEvent e) = SpiderEvent <$> Reflex.Spider.Internal.headE e
2270−
2271−instance Reflex.Class.MonadSample (SpiderTimeline x) (SpiderPullM x) where
2272− {-# INLINABLE sample #-}
2273− sample = coerce . readBehaviorTracked . unSpiderBehavior
2274−
2275−instance HasSpiderTimeline x => Reflex.Class.MonadSample (SpiderTimeline x) (SpiderPushM x) where
2276− {-# INLINABLE sample #-}
2277− sample (SpiderBehavior b) = SpiderPushM $ readBehaviorUntracked b
2278−
2279−instance HasSpiderTimeline x => Reflex.Class.MonadHold (SpiderTimeline x) (SpiderPushM x) where
2280− {-# INLINABLE hold #-}
2281− hold v0 e = Reflex.Class.current <$> Reflex.Class.holdDyn v0 e
2282− {-# INLINABLE holdDyn #-}
2283− holdDyn v0 (SpiderEvent e) = SpiderPushM $ fmap (SpiderDynamic . dynamicHoldIdentity) $ Reflex.Spider.Internal.hold v0 $ coerce e
2284− {-# INLINABLE holdIncremental #-}
2285− holdIncremental v0 (SpiderEvent e) = SpiderPushM $ SpiderIncremental . dynamicHold <$> Reflex.Spider.Internal.hold v0 e
2286− {-# INLINABLE buildDynamic #-}
2287− buildDynamic getV0 (SpiderEvent e) = SpiderPushM $ fmap (SpiderDynamic . dynamicDynIdentity) $ Reflex.Spider.Internal.buildDynamic (coerce getV0) $ coerce e
2288− {-# INLINABLE headE #-}
2289− headE = R.slowHeadE
2290−-- headE (SpiderEvent e) = SpiderPushM $ SpiderEvent <$> Reflex.Spider.Internal.headE e
2291−
2292−instance HasSpiderTimeline x => Monad (Reflex.Class.Dynamic (SpiderTimeline x)) where
2293− {-# INLINE return #-}
2294− return = pure
2295− {-# INLINE (>>=) #-}
2296− x >>= f = SpiderDynamic $ dynamicDynIdentity $ newJoinDyn $ newMapDyn (unSpiderDynamic . f) $ unSpiderDynamic x
2297− {-# INLINE (>>) #-}
2298− (>>) = (*>)
2299− {-# INLINE fail #-}
2300− fail _ = error "Dynamic does not support 'fail'"
2301−
2302−{-# INLINABLE newJoinDyn #-}
2303−newJoinDyn :: HasSpiderTimeline x => Reflex.Spider.Internal.Dynamic x (Identity (Reflex.Spider.Internal.Dynamic x (Identity a))) -> Reflex.Spider.Internal.Dyn x (Identity a)
2304−newJoinDyn d =
2305− let readV0 = readBehaviorTracked . dynamicCurrent =<< readBehaviorTracked (dynamicCurrent d)
2306− eOuter = Reflex.Spider.Internal.push (fmap (Just . Identity) . readBehaviorUntracked . dynamicCurrent . runIdentity) $ dynamicUpdated d
2307− eInner = Reflex.Spider.Internal.switch $ dynamicUpdated <$> dynamicCurrent d
2308− eBoth = Reflex.Spider.Internal.coincidence $ dynamicUpdated . runIdentity <$> dynamicUpdated d
2309− v' = unSpiderEvent $ Reflex.Class.leftmost $ map SpiderEvent [eBoth, eOuter, eInner]
2310− in Reflex.Spider.Internal.unsafeBuildDynamic readV0 v'
2311−
2312−instance HasSpiderTimeline x => Functor (Reflex.Class.Dynamic (SpiderTimeline x)) where
2313− fmap = mapDynamicSpider
2314− x <$ d = R.unsafeBuildDynamic (return x) $ x <$ R.updated d
2315−
2316−mapDynamicSpider :: HasSpiderTimeline x => (a -> b) -> Reflex.Class.Dynamic (SpiderTimeline x) a -> Reflex.Class.Dynamic (SpiderTimeline x) b
2317−mapDynamicSpider f = SpiderDynamic . newMapDyn f . unSpiderDynamic
2318−{-# INLINE [1] mapDynamicSpider #-}
2319−
2320−instance HasSpiderTimeline x => Applicative (Reflex.Class.Dynamic (SpiderTimeline x)) where
2321− pure = SpiderDynamic . dynamicConst
2322−#if MIN_VERSION_base(4,10,0)
2323− liftA2 f a b = SpiderDynamic $ Reflex.Spider.Internal.zipDynWith f (unSpiderDynamic a) (unSpiderDynamic b)
2324−#endif
2325− SpiderDynamic a <*> SpiderDynamic b = SpiderDynamic $ Reflex.Spider.Internal.zipDynWith ($) a b
2326− a *> b = R.unsafeBuildDynamic (R.sample $ R.current b) $ R.leftmost [R.updated b, R.tag (R.current b) $ R.updated a]
2327− (<*) = flip (*>) -- There are no effects, so order doesn't matter
2328−
2329−holdSpiderEventM :: HasSpiderTimeline x => a -> Reflex.Class.Event (SpiderTimeline x) a -> EventM x (Reflex.Class.Behavior (SpiderTimeline x) a)
2330−holdSpiderEventM v0 e = fmap (SpiderBehavior . behaviorHoldIdentity) $ Reflex.Spider.Internal.hold v0 $ coerce $ unSpiderEvent e
2331−
2332−holdDynSpiderEventM :: HasSpiderTimeline x => a -> Reflex.Class.Event (SpiderTimeline x) a -> EventM x (Reflex.Class.Dynamic (SpiderTimeline x) a)
2333−holdDynSpiderEventM v0 e = fmap (SpiderDynamic . dynamicHoldIdentity) $ Reflex.Spider.Internal.hold v0 $ coerce $ unSpiderEvent e
2334−
2335−holdIncrementalSpiderEventM :: (HasSpiderTimeline x, Patch p) => PatchTarget p -> Reflex.Class.Event (SpiderTimeline x) p -> EventM x (Reflex.Class.Incremental (SpiderTimeline x) p)
2336−holdIncrementalSpiderEventM v0 e = fmap (SpiderIncremental . dynamicHold) $ Reflex.Spider.Internal.hold v0 $ unSpiderEvent e
2337−
2338−buildDynamicSpiderEventM :: HasSpiderTimeline x => SpiderPushM x a -> Reflex.Class.Event (SpiderTimeline x) a -> EventM x (Reflex.Class.Dynamic (SpiderTimeline x) a)
2339−buildDynamicSpiderEventM getV0 e = fmap (SpiderDynamic . dynamicDynIdentity) $ Reflex.Spider.Internal.buildDynamic (coerce getV0) $ coerce $ unSpiderEvent e
2340−
2341−instance HasSpiderTimeline x => Reflex.Class.MonadHold (SpiderTimeline x) (SpiderHost x) where
2342− {-# INLINABLE hold #-}
2343− hold v0 e = runFrame . runSpiderHostFrame $ Reflex.Class.hold v0 e
2344− {-# INLINABLE holdDyn #-}
2345− holdDyn v0 e = runFrame . runSpiderHostFrame $ Reflex.Class.holdDyn v0 e
2346− {-# INLINABLE holdIncremental #-}
2347− holdIncremental v0 e = runFrame . runSpiderHostFrame $ Reflex.Class.holdIncremental v0 e
2348− {-# INLINABLE buildDynamic #-}
2349− buildDynamic getV0 e = runFrame . runSpiderHostFrame $ Reflex.Class.buildDynamic getV0 e
2350− {-# INLINABLE headE #-}
2351− headE e = runFrame . runSpiderHostFrame $ Reflex.Class.headE e
2352−
2353−instance HasSpiderTimeline x => Reflex.Class.MonadSample (SpiderTimeline x) (SpiderHostFrame x) where
2354− sample = SpiderHostFrame . readBehaviorUntracked . unSpiderBehavior --TODO: This can cause problems with laziness, so we should get rid of it if we can
2355−
2356−instance HasSpiderTimeline x => Reflex.Class.MonadHold (SpiderTimeline x) (SpiderHostFrame x) where
2357− {-# INLINABLE hold #-}
2358− hold v0 e = SpiderHostFrame $ fmap (SpiderBehavior . behaviorHoldIdentity) $ Reflex.Spider.Internal.hold v0 $ coerce $ unSpiderEvent e
2359− {-# INLINABLE holdDyn #-}
2360− holdDyn v0 e = SpiderHostFrame $ fmap (SpiderDynamic . dynamicHoldIdentity) $ Reflex.Spider.Internal.hold v0 $ coerce $ unSpiderEvent e
2361− {-# INLINABLE holdIncremental #-}
2362− holdIncremental v0 e = SpiderHostFrame $ fmap (SpiderIncremental . dynamicHold) $ Reflex.Spider.Internal.hold v0 $ unSpiderEvent e
2363− {-# INLINABLE buildDynamic #-}
2364− buildDynamic getV0 e = SpiderHostFrame $ fmap (SpiderDynamic . dynamicDynIdentity) $ Reflex.Spider.Internal.buildDynamic (coerce getV0) $ coerce $ unSpiderEvent e
2365− {-# INLINABLE headE #-}
2366− headE = R.slowHeadE
2367−-- headE (SpiderEvent e) = SpiderHostFrame $ SpiderEvent <$> Reflex.Spider.Internal.headE e
2368−
2369−instance HasSpiderTimeline x => Reflex.Class.MonadSample (SpiderTimeline x) (SpiderHost x) where
2370− {-# INLINABLE sample #-}
2371− sample = runFrame . readBehaviorUntracked . unSpiderBehavior
2372−
2373−instance HasSpiderTimeline x => Reflex.Class.MonadSample (SpiderTimeline x) (Reflex.Spider.Internal.ReadPhase x) where
2374− {-# INLINABLE sample #-}
2375− sample = Reflex.Spider.Internal.ReadPhase . Reflex.Class.sample
2376−
2377−instance HasSpiderTimeline x => Reflex.Class.MonadHold (SpiderTimeline x) (Reflex.Spider.Internal.ReadPhase x) where
2378− {-# INLINABLE hold #-}
2379− hold v0 e = Reflex.Spider.Internal.ReadPhase $ Reflex.Class.hold v0 e
2380− {-# INLINABLE holdDyn #-}
2381− holdDyn v0 e = Reflex.Spider.Internal.ReadPhase $ Reflex.Class.holdDyn v0 e
2382− {-# INLINABLE holdIncremental #-}
2383− holdIncremental v0 e = Reflex.Spider.Internal.ReadPhase $ Reflex.Class.holdIncremental v0 e
2384− {-# INLINABLE buildDynamic #-}
2385− buildDynamic getV0 e = Reflex.Spider.Internal.ReadPhase $ Reflex.Class.buildDynamic getV0 e
2386− {-# INLINABLE headE #-}
2387− headE e = Reflex.Spider.Internal.ReadPhase $ Reflex.Class.headE e
2388−
2389−--------------------------------------------------------------------------------
2390−-- Deprecated items
2391−--------------------------------------------------------------------------------
2392−
2393−-- | 'SpiderEnv' is the old name for 'SpiderTimeline'
2394−{-# DEPRECATED SpiderEnv "Use 'SpiderTimelineEnv' instead" #-}
2395−type SpiderEnv = SpiderTimeline
2396−instance HasSpiderTimeline x => Reflex.Host.Class.MonadSubscribeEvent (SpiderTimeline x) (SpiderHostFrame x) where
2397− {-# INLINABLE subscribeEvent #-}
2398− subscribeEvent e = SpiderHostFrame $ do
2399− --TODO: Unsubscribe eventually (manually and/or with weak ref)
2400− val <- liftIO $ newIORef Nothing
2401− subscription <- subscribe (unSpiderEvent e) $ Subscriber
2402− { subscriberPropagate = \a -> do
2403− liftIO $ writeIORef val $ Just a
2404− scheduleClear val
2405− , subscriberInvalidateHeight = \_ -> return ()
2406− , subscriberRecalculateHeight = \_ -> return ()
2407− }
2408− return $ SpiderEventHandle
2409− { spiderEventHandleSubscription = subscription
2410− , spiderEventHandleValue = val
2411− }
2412−
2413−instance HasSpiderTimeline x => Reflex.Host.Class.ReflexHost (SpiderTimeline x) where
2414− type EventTrigger (SpiderTimeline x) = RootTrigger x
2415− type EventHandle (SpiderTimeline x) = SpiderEventHandle x
2416− type HostFrame (SpiderTimeline x) = SpiderHostFrame x
2417−
2418−instance HasSpiderTimeline x => Reflex.Host.Class.MonadReadEvent (SpiderTimeline x) (Reflex.Spider.Internal.ReadPhase x) where
2419− {-# NOINLINE readEvent #-}
2420− readEvent h = Reflex.Spider.Internal.ReadPhase $ fmap (fmap return) $ liftIO $ do
2421− result <- readIORef $ spiderEventHandleValue h
2422− touch h
2423− return result
2424−
2425−instance Reflex.Host.Class.MonadReflexCreateTrigger (SpiderTimeline x) (SpiderHost x) where
2426− newEventWithTrigger = SpiderHost . fmap SpiderEvent . newEventWithTriggerIO
2427− newFanEventWithTrigger f = SpiderHost $ do
2428− es <- newFanEventWithTriggerIO f
2429− return $ Reflex.Class.EventSelector $ SpiderEvent . Reflex.Spider.Internal.select es
2430−
2431−instance Reflex.Host.Class.MonadReflexCreateTrigger (SpiderTimeline x) (SpiderHostFrame x) where
2432− newEventWithTrigger = SpiderHostFrame . EventM . liftIO . fmap SpiderEvent . newEventWithTriggerIO
2433− newFanEventWithTrigger f = SpiderHostFrame $ EventM $ liftIO $ do
2434− es <- newFanEventWithTriggerIO f
2435− return $ Reflex.Class.EventSelector $ SpiderEvent . Reflex.Spider.Internal.select es
2436−
2437−instance HasSpiderTimeline x => Reflex.Host.Class.MonadSubscribeEvent (SpiderTimeline x) (SpiderHost x) where
2438− {-# INLINABLE subscribeEvent #-}
2439− subscribeEvent = runFrame . runSpiderHostFrame . Reflex.Host.Class.subscribeEvent
2440−
2441−instance HasSpiderTimeline x => Reflex.Host.Class.MonadReflexHost (SpiderTimeline x) (SpiderHost x) where
2442− type ReadPhase (SpiderHost x) = Reflex.Spider.Internal.ReadPhase x
2443− fireEventsAndRead es (Reflex.Spider.Internal.ReadPhase a) = run es a
2444− runHostFrame = runFrame . runSpiderHostFrame
2445−
2446−unsafeNewSpiderTimelineEnv :: forall x. IO (SpiderTimelineEnv x)
2447−unsafeNewSpiderTimelineEnv = do
2448− lock <- newMVar ()
2449− env <- newEventEnv
2450−#ifdef DEBUG
2451− depthRef <- newIORef 0
2452−#endif
2453− return $ SpiderTimelineEnv
2454− { _spiderTimeline_lock = lock
2455− , _spiderTimeline_eventEnv = env
2456−#ifdef DEBUG
2457− , _spiderTimeline_depth = depthRef
2458−#endif
2459− }
2460−
2461−-- | Create a new SpiderTimelineEnv
2462−newSpiderTimeline :: IO (Some SpiderTimelineEnv)
2463−newSpiderTimeline = withSpiderTimeline (pure . Some.This)
2464−
2465−data LocalSpiderTimeline x s
2466−
2467−instance Reifies s (SpiderTimelineEnv x) =>
2468− HasSpiderTimeline (LocalSpiderTimeline x s) where
2469− spiderTimeline = localSpiderTimeline (Proxy :: Proxy s) $ reflect (Proxy :: Proxy s)
2470−
2471−localSpiderTimeline
2472− :: Proxy s
2473− -> SpiderTimelineEnv x
2474− -> SpiderTimelineEnv (LocalSpiderTimeline x s)
2475−localSpiderTimeline _ = unsafeCoerce
2476−
2477−-- | Pass a new timeline to the given function.
2478−withSpiderTimeline :: (forall x. HasSpiderTimeline x => SpiderTimelineEnv x -> IO r) -> IO r
2479−withSpiderTimeline k = do
2480− env <- unsafeNewSpiderTimelineEnv
2481− reify env $ \s -> k $ localSpiderTimeline s env
2482−
2483−newtype SpiderPullM x a = SpiderPullM (BehaviorM x a) deriving (Functor, Applicative, Monad, MonadIO, MonadFix)
2484−
2485−type ComputeM = EventM
2486−
2487−newtype SpiderPushM x a = SpiderPushM (ComputeM x a) deriving (Functor, Applicative, Monad, MonadIO, MonadFix)
2488−
2489−instance HasSpiderTimeline x => R.Reflex (SpiderTimeline x) where
2490− {-# SPECIALIZE instance R.Reflex (SpiderTimeline Global) #-}
2491− newtype Behavior (SpiderTimeline x) a = SpiderBehavior { unSpiderBehavior :: Behavior x a }
2492− newtype Event (SpiderTimeline x) a = SpiderEvent { unSpiderEvent :: Event x a }
2493− newtype Dynamic (SpiderTimeline x) a = SpiderDynamic { unSpiderDynamic :: Dynamic x (Identity a) } -- deriving (Functor, Applicative, Monad)
2494− newtype Incremental (SpiderTimeline x) p = SpiderIncremental { unSpiderIncremental :: Dynamic x p }
2495− type PullM (SpiderTimeline x) = SpiderPullM x
2496− type PushM (SpiderTimeline x) = SpiderPushM x
2497− {-# INLINABLE never #-}
2498− never = SpiderEvent eventNever
2499− {-# INLINABLE constant #-}
2500− constant = SpiderBehavior . behaviorConst
2501− {-# INLINE push #-}
2502− push f = SpiderEvent . push (coerce f) . unSpiderEvent
2503− {-# INLINE pushCheap #-}
2504− pushCheap f = SpiderEvent . pushCheap (coerce f) . unSpiderEvent
2505− {-# INLINABLE pull #-}
2506− pull = SpiderBehavior . pull . coerce
2507− {-# INLINABLE merge #-}
2508− merge = SpiderEvent . merge . dynamicConst . (coerce :: DMap k (R.Event (SpiderTimeline x)) -> DMap k (Event x))
2509− {-# INLINABLE fan #-}
2510− fan e = R.EventSelector $ SpiderEvent . select (fan (unSpiderEvent e))
2511− {-# INLINABLE switch #-}
2512− switch = SpiderEvent . switch . (coerce :: Behavior x (R.Event (SpiderTimeline x) a) -> Behavior x (Event x a)) . unSpiderBehavior
2513− {-# INLINABLE coincidence #-}
2514− coincidence = SpiderEvent . coincidence . (coerce :: Event x (R.Event (SpiderTimeline x) a) -> Event x (Event x a)) . unSpiderEvent
2515− {-# INLINABLE current #-}
2516− current = SpiderBehavior . dynamicCurrent . unSpiderDynamic
2517− {-# INLINABLE updated #-}
2518− updated = coerce $ SpiderEvent . dynamicUpdated . unSpiderDynamic
2519− {-# INLINABLE unsafeBuildDynamic #-}
2520− unsafeBuildDynamic readV0 v' = SpiderDynamic $ dynamicDynIdentity $ unsafeBuildDynamic (coerce readV0) $ coerce $ unSpiderEvent v'
2521− {-# INLINABLE unsafeBuildIncremental #-}
2522− unsafeBuildIncremental readV0 dv = SpiderIncremental $ dynamicDyn $ unsafeBuildDynamic (coerce readV0) $ unSpiderEvent dv
2523− {-# INLINABLE mergeIncremental #-}
2524− mergeIncremental = SpiderEvent . merge . (unsafeCoerce :: Dynamic x (PatchDMap k (R.Event (SpiderTimeline x))) -> Dynamic x (PatchDMap k (Event x))) . unSpiderIncremental
2525− {-# INLINABLE mergeIncrementalWithMove #-}
2526− mergeIncrementalWithMove = SpiderEvent . mergeWithMove . (unsafeCoerce :: Dynamic x (PatchDMapWithMove k (R.Event (SpiderTimeline x))) -> Dynamic x (PatchDMapWithMove k (Event x))) . unSpiderIncremental
2527− {-# INLINABLE currentIncremental #-}
2528− currentIncremental = SpiderBehavior . dynamicCurrent . unSpiderIncremental
2529− {-# INLINABLE updatedIncremental #-}
2530− updatedIncremental = SpiderEvent . dynamicUpdated . unSpiderIncremental
2531− {-# INLINABLE incrementalToDynamic #-}
2532− incrementalToDynamic (SpiderIncremental i) = SpiderDynamic $ dynamicDynIdentity $ unsafeBuildDynamic (readBehaviorUntracked $ dynamicCurrent i) $ flip push (dynamicUpdated i) $ \p -> do
2533− c <- readBehaviorUntracked $ dynamicCurrent i
2534− return $ Identity <$> apply p c --TODO: Avoid the redundant 'apply'
2535− eventCoercion Coercion = Coercion
2536− behaviorCoercion Coercion = Coercion
2537− dynamicCoercion = unsafeCoerce --TODO: How can we avoid this unsafeCoerce? This is safe only because we know how Identity works as a Patch instance
2538− {-# INLINABLE mergeIntIncremental #-}
2539− mergeIntIncremental = SpiderEvent . mergeInt . (unsafeCoerce :: Dynamic x (PatchIntMap (R.Event (SpiderTimeline x) a)) -> Dynamic x (PatchIntMap (Event x a))) . unSpiderIncremental
2540− {-# INLINABLE fanInt #-}
2541− fanInt e = R.EventSelectorInt $ SpiderEvent . selectInt (fanInt (unSpiderEvent e))
2542−
2543−data RootTrigger x a = forall k. GCompare k => RootTrigger (WeakBag (Subscriber x a), IORef (DMap k Identity), k a)
2544−
2545−data SpiderEventHandle x a = SpiderEventHandle
2546− { spiderEventHandleSubscription :: EventSubscription x
2547− , spiderEventHandleValue :: IORef (Maybe a)
2548− }
2549−
2550−instance MonadRef (EventM x) where
2551− type Ref (EventM x) = Ref IO
2552− {-# INLINABLE newRef #-}
2553− {-# INLINABLE readRef #-}
2554− {-# INLINABLE writeRef #-}
2555− newRef = liftIO . newRef
2556− readRef = liftIO . readRef
2557− writeRef r a = liftIO $ writeRef r a
2558−
2559−instance MonadAtomicRef (EventM x) where
2560− {-# INLINABLE atomicModifyRef #-}
2561− atomicModifyRef r f = liftIO $ atomicModifyRef r f
2562−
2563−-- | The monad for actions that manipulate a Spider timeline identified by @x@
2564−newtype SpiderHost x a = SpiderHost { unSpiderHost :: IO a } deriving (Functor, Applicative, MonadFix, MonadIO, MonadException, MonadAsyncException)
2565−
2566−instance Monad (SpiderHost x) where
2567− {-# INLINABLE (>>=) #-}
2568− SpiderHost x >>= f = SpiderHost $ x >>= unSpiderHost . f
2569− {-# INLINABLE (>>) #-}
2570− SpiderHost x >> SpiderHost y = SpiderHost $ x >> y
2571− {-# INLINABLE return #-}
2572− return x = SpiderHost $ return x
2573− {-# INLINABLE fail #-}
2574− fail s = SpiderHost $ fail s
2575−
2576−-- | Run an action affecting the global Spider timeline; this will be guarded by
2577−-- a mutex for that timeline
2578−runSpiderHost :: SpiderHost Global a -> IO a
2579−runSpiderHost (SpiderHost a) = a
2580−
2581−-- | Run an action affecting a given Spider timeline; this will be guarded by a
2582−-- mutex for that timeline
2583−runSpiderHostForTimeline :: SpiderHost x a -> SpiderTimelineEnv x -> IO a
2584−runSpiderHostForTimeline (SpiderHost a) _ = a
2585−
2586−newtype SpiderHostFrame x a = SpiderHostFrame { runSpiderHostFrame :: EventM x a }
2587− deriving (Functor, Applicative, MonadFix, MonadIO, MonadException, MonadAsyncException)
2588−
2589−instance Monad (SpiderHostFrame x) where
2590− {-# INLINABLE (>>=) #-}
2591− SpiderHostFrame x >>= f = SpiderHostFrame $ x >>= runSpiderHostFrame . f
2592− {-# INLINABLE (>>) #-}
2593− SpiderHostFrame x >> SpiderHostFrame y = SpiderHostFrame $ x >> y
2594− {-# INLINABLE return #-}
2595− return x = SpiderHostFrame $ return x
2596− {-# INLINABLE fail #-}
2597− fail s = SpiderHostFrame $ fail s
2598−
2599−instance NotReady (SpiderTimeline x) (SpiderHostFrame x) where
2600− notReadyUntil _ = pure ()
2601− notReady = pure ()
2602−
2603−newEventWithTriggerIO :: (RootTrigger x a -> IO (IO ())) -> IO (Event x a)
2604−newEventWithTriggerIO f = do
2605− es <- newFanEventWithTriggerIO $ \Refl -> f
2606− return $ select es Refl
2607−
2608−newFanEventWithTriggerIO :: GCompare k => (forall a. k a -> RootTrigger x a -> IO (IO ())) -> IO (EventSelector x k)
2609−newFanEventWithTriggerIO f = do
2610− occRef <- newIORef DMap.empty
2611− subscribedRef <- newIORef DMap.empty
2612− let !r = Root
2613− { rootOccurrence = occRef
2614− , rootSubscribed = subscribedRef
2615− , rootInit = f
2616− }
2617− return $ EventSelector $ \k -> eventRoot k r
2618−
2619−newtype ReadPhase x a = ReadPhase (ResultM x a) deriving (Functor, Applicative, Monad, MonadFix)
2620−
2621−instance MonadRef (SpiderHost x) where
2622− type Ref (SpiderHost x) = Ref IO
2623− newRef = SpiderHost . newRef
2624− readRef = SpiderHost . readRef
2625− writeRef r = SpiderHost . writeRef r
2626−
2627−instance MonadAtomicRef (SpiderHost x) where
2628− atomicModifyRef r = SpiderHost . atomicModifyRef r
2629−
2630−instance MonadRef (SpiderHostFrame x) where
2631− type Ref (SpiderHostFrame x) = Ref IO
2632− newRef = SpiderHostFrame . newRef
2633− readRef = SpiderHostFrame . readRef
2634− writeRef r = SpiderHostFrame . writeRef r
2635−
2636−instance MonadAtomicRef (SpiderHostFrame x) where
2637− atomicModifyRef r = SpiderHostFrame . atomicModifyRef r
2638−
2639−instance PrimMonad (SpiderHostFrame x) where
2640− type PrimState (SpiderHostFrame x) = PrimState IO
2641− primitive = SpiderHostFrame . EventM . primitive