@@ -1,2176 +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 MagicHash #-}
13−{-# LANGUAGE MultiParamTypeClasses #-}
14−{-# LANGUAGE MultiWayIf #-}
15−{-# LANGUAGE RankNTypes #-}
16−{-# LANGUAGE RoleAnnotations #-}
17−{-# LANGUAGE ScopedTypeVariables #-}
18−{-# LANGUAGE TypeFamilies #-}
19−{-# LANGUAGE TypeOperators #-}
20−{-# LANGUAGE UndecidableInstances #-}
21−#ifdef USE_REFLEX_OPTIMIZER
22−{-# OPTIONS_GHC -fplugin=Reflex.Optimizer #-}
23−#endif
24−#ifdef SPECIALIZE_TO_SPIDERTIMELINE_GLOBAL
25−{-# OPTIONS_GHC -fno-warn-orphans #-}
26−#endif
27−-- | This module is the implementation of the 'Spider' 'Reflex' engine. It uses
28−-- a graph traversal algorithm to propagate 'Event's and 'Behavior's.
29−module Reflex.Spider.Internal (module Reflex.Spider.Internal) where
30−
31−import Control.Applicative
32−import Control.Concurrent
33−import Control.Exception
34−import Control.Monad hiding (forM, forM_, mapM, mapM_, sequence)
35−import Control.Monad.Exception
36−import Control.Monad.Identity hiding (forM, forM_, mapM, mapM_, sequence)
37−import Control.Monad.Primitive
38−import Control.Monad.Reader hiding (forM, forM_, mapM, mapM_, sequence)
39−import Control.Monad.Ref
40−import Data.Align
41−import Data.Coerce
42−import Data.Dependent.Map (DMap, DSum (..))
43−import qualified Data.Dependent.Map as DMap
44−import Data.Foldable hiding (concat, elem, sequence_)
45−import Data.Function
46−import Data.Functor.Constant
47−import Data.Functor.Misc
48−import Data.Functor.Product
49−import Data.GADT.Compare
50−import Data.IntMap.Strict (IntMap)
51−import qualified Data.IntMap.Strict as IntMap
52−import Data.IORef
53−import Data.List hiding (foldl')
54−import Data.Maybe
55−import Data.Monoid ((<>))
56−import Data.Proxy
57−import Data.These
58−import Data.Traversable
59−import Data.Word
60−import GHC.Exts
61−import GHC.IORef (IORef (..))
62−import GHC.Stack
63−import Reflex.FunctorMaybe
64−import System.IO.Unsafe
65−import System.Mem.Weak
66−import Unsafe.Coerce
67−
68−#ifdef DEBUG_CYCLES
69−import Control.Monad.State hiding (forM, forM_, mapM, mapM_, sequence)
70−import Data.List.NonEmpty (NonEmpty (..), nonEmpty)
71−import qualified Data.List.NonEmpty as NonEmpty
72−import Data.Monoid (mempty)
73−import Data.Tree (Forest, Tree (..), drawForest)
74−#endif
75−
76−import Data.WeakBag (WeakBag, WeakBagTicket)
77−import qualified Data.WeakBag as WeakBag
78−#ifndef SPECIALIZE_TO_SPIDERTIMELINE_GLOBAL
79−import Data.Reflection
80−import Data.Some (Some)
81−import qualified Data.Some as Some
82−import Data.Type.Coercion
83−import qualified Reflex.Class
84−import qualified Reflex.Class as R
85−import qualified Reflex.Host.Class
86−#endif
87−import Reflex.Patch
88−
89−-- Note: must come last to silence warnings due to AMP on GHC < 7.10
90−import Prelude hiding (any, concat, mapM, mapM_, sequence)
91−
92−#ifdef DEBUG_TRACE_EVENTS
93−import System.IO (stderr)
94−import qualified Data.ByteString.Char8 as BS8
95−#endif
96−
97−#ifdef DEBUG_TRACE_EVENTS
98−
99−withStackOneLine :: (BS8.ByteString -> a) -> a
100−withStackOneLine expr = unsafePerformIO $ do
101− stack <- currentCallStack
102− return (expr (BS8.pack (unwords (reverse stack))))
103−
104−#endif
105−
106−debugPropagate :: Bool
107−
108−debugInvalidateHeight :: Bool
109−
110−debugInvalidate :: Bool
111−
112−#ifdef DEBUG
113−
114−#define DEBUG_NODEIDS
115−
116−debugPropagate = True
117−
118−debugInvalidateHeight = False
119−
120−debugInvalidate = True
121−
122−class HasNodeId a where
123− getNodeId :: a -> Int
124−
125−instance HasNodeId (Hold x p a) where
126− getNodeId = holdNodeId
127−
128−instance HasNodeId (PushSubscribed x a b) where
129− getNodeId = pushSubscribedNodeId
130−
131−instance HasNodeId (SwitchSubscribed x a) where
132− getNodeId = switchSubscribedNodeId
133−
134−instance HasNodeId (FanSubscribed x a) where
135− getNodeId = fanSubscribedNodeId
136−
137−instance HasNodeId (CoincidenceSubscribed x a) where
138− getNodeId = coincidenceSubscribedNodeId
139−
140−instance HasNodeId (RootSubscribed x a) where
141− getNodeId = rootSubscribedNodeId
142−
143−instance HasNodeId (Pull x a) where
144− getNodeId = pullNodeId
145−
146−{-# INLINE showNodeId #-}
147−showNodeId :: HasNodeId a => a -> String
148−showNodeId = ("#"<>) . show . getNodeId
149−
150−showSubscriberType :: Subscriber x a -> String
151−showSubscriberType = \case
152− SubscriberPush _ _ -> "SubscriberPush"
153− SubscriberMerge _ _ -> "SubscriberMerge"
154− SubscriberFan _ -> "SubscriberFan"
155− SubscriberMergeChange _ -> "SubscriberMergeChange"
156− SubscriberHold _ -> "SubscriberHold"
157− SubscriberHoldIdentity _ -> "SubscriberHoldIdentity"
158− SubscriberSwitch _ -> "SubscriberSwitch"
159− SubscriberCoincidenceOuter _ -> "SubscriberCoincidenceOuter"
160− SubscriberCoincidenceInner _ -> "SubscriberCoincidenceInner"
161− SubscriberHandle -> "SubscriberHandle"
162−
163−showEventType :: Event x a -> String
164−showEventType = \case
165− EventRoot _ _ -> "EventRoot"
166− EventNever -> "EventNever"
167− EventPush _ -> "EventPush"
168− EventMerge _ -> "EventMerge"
169− EventFan _ _ -> "EventFan"
170− EventSwitch _ -> "EventSwitch"
171− EventCoincidence _ -> "EventCoincidence"
172− EventHold _ -> "EventHold"
173− EventDyn _ -> "EventDyn"
174− EventHoldIdentity _ -> "EventHoldIdentity"
175− EventDynIdentity _ -> "EventDynIdentity"
176−
177−#else
178−
179−debugPropagate = False
180−
181−debugInvalidateHeight = False
182−
183−debugInvalidate = False
184−
185−-- This must be inline, or error messages will cause memory leaks due to retaining the node in question
186−{-# INLINE showNodeId #-}
187−showNodeId :: a -> String
188−showNodeId _ = ""
189−
190−#endif
191−
192−#ifdef DEBUG_NODEIDS
193−{-# NOINLINE nextNodeIdRef #-}
194−nextNodeIdRef :: IORef Int
195−nextNodeIdRef = unsafePerformIO $ newIORef 1
196−
197−newNodeId :: IO Int
198−newNodeId = atomicModifyIORef' nextNodeIdRef $ \n -> (succ n, n)
199−
200−{-# NOINLINE unsafeNodeId #-}
201−unsafeNodeId :: a -> Int
202−unsafeNodeId a = unsafePerformIO $ do
203− touch a
204− newNodeId
205−#endif
206−
207−--------------------------------------------------------------------------------
208−-- EventSubscription
209−--------------------------------------------------------------------------------
210−
211−--NB: Once you subscribe to an Event, you must always hold on the the WHOLE EventSubscription you get back
212−-- If you do not retain the subscription, you may be prematurely unsubscribed from the parent event.
213−data EventSubscription x = EventSubscription
214− { _eventSubscription_unsubscribe :: !(IO ())
215− , _eventSubscription_subscribed :: {-# UNPACK #-} !(EventSubscribed x)
216− }
217−
218−unsubscribe :: EventSubscription x -> IO ()
219−unsubscribe (EventSubscription u _) = u
220−
221−--------------------------------------------------------------------------------
222−-- Event
223−--------------------------------------------------------------------------------
224−
225−newtype Event x a = Event { unEvent :: Subscriber x a -> EventM x (EventSubscription x, Maybe a) }
226−
227−{-# INLINE subscribeAndRead #-}
228−subscribeAndRead :: Event x a -> Subscriber x a -> EventM x (EventSubscription x, Maybe a)
229−subscribeAndRead = unEvent
230−
231−{-# RULES
232−"cacheEvent/cacheEvent" forall e. cacheEvent (cacheEvent e) = cacheEvent e
233−"cacheEvent/pushCheap" forall f e. pushCheap f (cacheEvent e) = cacheEvent (pushCheap f e)
234−"hold/cacheEvent" forall f e. hold f (cacheEvent e) = hold f e
235− #-}
236−
237−-- | Construct an 'Event' equivalent to that constructed by 'push', but with no
238−-- caching; if the computation function is very cheap, this is (much) more
239−-- efficient than 'push'
240−{-# NOINLINE pushCheap #-}
241−pushCheap :: HasSpiderTimeline x => (a -> ComputeM x (Maybe b)) -> Event x a -> Event x b
242−pushCheap f e = Event $ \sub -> do
243− (subscription, occ) <- subscribeAndRead e $ sub
244− { subscriberPropagate = \a -> do
245− mb <- runComputeM $ f a
246− mapM_ (subscriberPropagate sub) mb
247− }
248− occ' <- join <$> mapM (runComputeM . f) occ
249− return (subscription, occ')
250−
251−data CacheSubscribed x a
252− = CacheSubscribed { _cacheSubscribed_subscribers :: {-# UNPACK #-} !(WeakBag (Subscriber x a))
253− , _cacheSubscribed_weakSelf :: {-# UNPACK #-} !(IORef (Weak (CacheSubscribed x a)))
254− , _cacheSubscribed_parent :: {-# UNPACK #-} !(EventSubscription x)
255− , _cacheSubscribed_cached :: {-# UNPACK #-} !(IORef (Maybe (CacheSubscribed x a)))
256− , _cacheSubscribed_occurrence :: {-# UNPACK #-} !(IORef (Maybe a))
257− }
258−
259−-- | Construct an 'Event' whose value is guaranteed not to be recomputed
260−-- repeatedly
261−--
262−--TODO: Try a caching strategy where we subscribe directly to the parent when
263−--there's only one subscriber, and then build our own WeakBag only when a second
264−--subscriber joins
265−{-# NOINLINE cacheEvent #-}
266−cacheEvent :: HasSpiderTimeline x => Event x a -> Event x a
267−cacheEvent e =
268−#ifdef DEBUG_TRACE_EVENTS
269− withStackOneLine $ \callSite -> Event $
270−#else
271− Event $
272−#endif
273− let !mSubscribedRef = unsafeNewIORef e Nothing
274− in \sub -> {-# SCC "cacheEvent" #-} do
275−#ifdef DEBUG_TRACE_EVENTS
276− unless (BS8.null callSite) $ liftIO $ BS8.hPutStrLn stderr callSite
277−#endif
278− mSubscribed <- liftIO $ readIORef mSubscribedRef
279− case mSubscribed of
280− Just subscribed -> liftIO $ do
281− ticket <- WeakBag.insert sub (_cacheSubscribed_subscribers subscribed) (_cacheSubscribed_weakSelf subscribed) cleanupCacheSubscribed
282− occ <- readIORef $ _cacheSubscribed_occurrence subscribed
283− let es = EventSubscribed
284− { eventSubscribedHeightRef = eventSubscribedHeightRef $ _eventSubscription_subscribed $ _cacheSubscribed_parent subscribed
285− , eventSubscribedRetained = toAny subscribed
286− }
287− return (EventSubscription (WeakBag.remove ticket >> touch ticket) es, occ)
288− Nothing -> do
289− weakSelf <- liftIO $ newIORef $ error "cacheEvent: weakSelf not yet intialized"
290− (subscribers, ticket) <- liftIO $ WeakBag.singleton sub weakSelf cleanupCacheSubscribed
291− occRef <- liftIO $ newIORef undefined
292− (parentSub, occ) <- subscribeAndRead e $ Subscriber
293− { subscriberPropagate = \a -> do
294− liftIO $ writeIORef occRef $ Just a
295− scheduleClear occRef
296− propagate a subscribers
297− , subscriberInvalidateHeight = \old -> do
298− WeakBag.traverse subscribers $ invalidateSubscriberHeight old
299− , subscriberRecalculateHeight = \new -> do
300− WeakBag.traverse subscribers $ recalculateSubscriberHeight new
301− }
302− liftIO $ writeIORef occRef occ
303− when (isJust occ) $ scheduleClear occRef
304− let !subscribed = CacheSubscribed
305− { _cacheSubscribed_subscribers = subscribers
306− , _cacheSubscribed_weakSelf = weakSelf
307− , _cacheSubscribed_parent = parentSub
308− , _cacheSubscribed_cached = mSubscribedRef
309− , _cacheSubscribed_occurrence = occRef
310− }
311− liftIO $ writeIORef mSubscribedRef $ Just subscribed
312− liftIO $ writeIORef weakSelf =<< evaluate =<< mkWeakPtrWithDebug subscribed "PushSubscribed"
313− return (EventSubscription (WeakBag.remove ticket >> touch ticket) (EventSubscribed (eventSubscribedHeightRef $ _eventSubscription_subscribed parentSub) (toAny subscribed)), occ)
314−
315−cleanupCacheSubscribed :: CacheSubscribed x a -> IO ()
316−cleanupCacheSubscribed self = do
317− unsubscribe $ _cacheSubscribed_parent self
318− writeIORef (_cacheSubscribed_cached self) Nothing
319−
320−subscribe :: Event x a -> Subscriber x a -> EventM x (EventSubscription x)
321−subscribe e s = fst <$> subscribeAndRead e s
322−
323−{-# INLINE wrap #-}
324−wrap :: MonadIO m => (t -> EventSubscribed x) -> (Subscriber x a -> m (WeakBagTicket, t, Maybe a)) -> Subscriber x a -> m (EventSubscription x, Maybe a)
325−wrap tag getSpecificSubscribed sub = do
326− (sln, subd, occ) <- getSpecificSubscribed sub
327− let es = tag subd
328− return (EventSubscription (WeakBag.remove sln >> touch sln) es, occ)
329−
330−eventRoot :: GCompare k => k a -> Root x k -> Event x a
331−eventRoot !k !r = Event $ wrap eventSubscribedRoot $ liftIO . getRootSubscribed k r
332−
333−eventNever :: Event x a
334−eventNever = Event $ \_ -> return (EventSubscription (return ()) eventSubscribedNever, Nothing)
335−
336−eventFan :: (GCompare k, HasSpiderTimeline x) => k a -> Fan x k -> Event x a
337−eventFan !k !f = Event $ wrap eventSubscribedFan $ getFanSubscribed k f
338−
339−eventSwitch :: HasSpiderTimeline x => Switch x a -> Event x a
340−eventSwitch !s = Event $ wrap eventSubscribedSwitch $ getSwitchSubscribed s
341−
342−eventCoincidence :: HasSpiderTimeline x => Coincidence x a -> Event x a
343−eventCoincidence !c = Event $ wrap eventSubscribedCoincidence $ getCoincidenceSubscribed c
344−
345−eventHold :: HasSpiderTimeline x => Hold x p -> Event x p
346−eventHold !h = Event $ subscribeHoldEvent h
347−
348−eventDyn :: (HasSpiderTimeline x, Patch p) => Dyn x p -> Event x p
349−eventDyn !j = Event $ \sub -> getDynHold j >>= \h -> subscribeHoldEvent h sub
350−
351−{-# INLINE subscribeCoincidenceInner #-}
352−subscribeCoincidenceInner :: CanSubscribe x m => Event x a -> Height -> CoincidenceSubscribed x a -> m (Maybe a, Height, EventSubscribed x)
353−subscribeCoincidenceInner inner outerHeight subscribedUnsafe = do
354− subInner <- liftIO $ newSubscriberCoincidenceInner subscribedUnsafe
355− (subscription@(EventSubscription _ innerSubd), innerOcc) <- subscribeAndRead inner subInner
356− innerHeight <- liftIO $ getEventSubscribedHeight innerSubd
357− let height = max innerHeight outerHeight
358− defer $ SomeResetCoincidence subscription $ if height > outerHeight then Just subscribedUnsafe else Nothing
359− return (innerOcc, height, innerSubd)
360−
361−--------------------------------------------------------------------------------
362−-- Subscriber
363−--------------------------------------------------------------------------------
364−
365−data Subscriber x a = Subscriber
366− { subscriberPropagate :: !(a -> EventM x ())
367− , subscriberInvalidateHeight :: !(Height -> IO ())
368− , subscriberRecalculateHeight :: !(Height -> IO ())
369− }
370−
371−--TODO: Move this comment to WeakBag
372−-- These function are constructor functions that are marked NOINLINE so they are
373−-- opaque to GHC. If we do not do this, then GHC will sometimes fuse the constructor away
374−-- so any weak references that are attached to the constructors will have their
375−-- finalizer run. Using the opaque constructor, does not see the
376−-- constructor application, so it behaves like an IORef and cannot be fused away.
377−--
378−-- The result is also evaluated to WHNF, since forcing a thunk invalidates
379−-- the weak pointer to it in some cases.
380−
381−newSubscriberHold :: (HasSpiderTimeline x, Patch p) => Hold x p -> IO (Subscriber x p)
382−newSubscriberHold h = return $ Subscriber
383− { subscriberPropagate = {-# SCC "traverseHold" #-} propagateSubscriberHold h
384− , subscriberInvalidateHeight = \_ -> return ()
385− , subscriberRecalculateHeight = \_ -> return ()
386− }
387−
388−newSubscriberFan :: forall x k. (HasSpiderTimeline x, GCompare k) => FanSubscribed x k -> IO (Subscriber x (DMap k Identity))
389−newSubscriberFan subscribed = return $ Subscriber
390− { subscriberPropagate = \a -> {-# SCC "traverseFan" #-} do
391− subs <- liftIO $ readIORef $ fanSubscribedSubscribers subscribed
392− tracePropagate (Proxy :: Proxy x) $ "SubscriberFan" <> showNodeId subscribed <> ": " ++ show (DMap.size subs) ++ " keys subscribed, " ++ show (DMap.size a) ++ " keys firing"
393− liftIO $ writeIORef (fanSubscribedOccurrence subscribed) $ Just a
394− scheduleClear $ fanSubscribedOccurrence subscribed
395− let f _ (Pair (Identity v) subsubs) = do
396− propagate v $ _fanSubscribedChildren_list subsubs
397− return $ Constant ()
398− _ <- DMap.traverseWithKey f $ DMap.intersectionWithKey (\_ -> Pair) a subs --TODO: Would be nice to have DMap.traverse_
399− return ()
400− , subscriberInvalidateHeight = \old -> do
401− when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberFan" <> showNodeId subscribed
402− subscribers <- readIORef $ fanSubscribedSubscribers subscribed
403− forM_ (DMap.toList subscribers) $ \(_ :=> v) -> WeakBag.traverse (_fanSubscribedChildren_list v) $ invalidateSubscriberHeight old
404− when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberFan" <> showNodeId subscribed <> " done"
405− , subscriberRecalculateHeight = \new -> do
406− when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberFan" <> showNodeId subscribed
407− subscribers <- readIORef $ fanSubscribedSubscribers subscribed
408− forM_ (DMap.toList subscribers) $ \(_ :=> v) -> WeakBag.traverse (_fanSubscribedChildren_list v) $ recalculateSubscriberHeight new
409− when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberFan" <> showNodeId subscribed <> " done"
410− }
411−
412−newSubscriberSwitch :: forall x a. HasSpiderTimeline x => SwitchSubscribed x a -> IO (Subscriber x a)
413−newSubscriberSwitch subscribed = return $ Subscriber
414− { subscriberPropagate = \a -> {-# SCC "traverseSwitch" #-} do
415− tracePropagate (Proxy :: Proxy x) $ "SubscriberSwitch" <> showNodeId subscribed
416− liftIO $ writeIORef (switchSubscribedOccurrence subscribed) $ Just a
417− scheduleClear $ switchSubscribedOccurrence subscribed
418− propagate a $ switchSubscribedSubscribers subscribed
419− , subscriberInvalidateHeight = \_ -> do
420− when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberSwitch" <> showNodeId subscribed
421− oldHeight <- readIORef $ switchSubscribedHeight subscribed
422− when (oldHeight /= invalidHeight) $ do
423− writeIORef (switchSubscribedHeight subscribed) $! invalidHeight
424− WeakBag.traverse (switchSubscribedSubscribers subscribed) $ invalidateSubscriberHeight oldHeight
425− when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberSwitch" <> showNodeId subscribed <> " done"
426− , subscriberRecalculateHeight = \new -> do
427− when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberSwitch" <> showNodeId subscribed
428− updateSwitchHeight new subscribed
429− when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberSwitch" <> showNodeId subscribed <> " done"
430− }
431−
432−newSubscriberCoincidenceOuter :: forall x b. HasSpiderTimeline x => CoincidenceSubscribed x b -> IO (Subscriber x (Event x b))
433−newSubscriberCoincidenceOuter subscribed = return $ Subscriber
434− { subscriberPropagate = \a -> {-# SCC "traverseCoincidenceOuter" #-} do
435− tracePropagate (Proxy :: Proxy x) $ "SubscriberCoincidenceOuter" <> showNodeId subscribed
436− outerHeight <- liftIO $ readIORef $ coincidenceSubscribedHeight subscribed
437− tracePropagate (Proxy :: Proxy x) $ " outerHeight = " <> show outerHeight
438− (occ, innerHeight, innerSubd) <- subscribeCoincidenceInner a outerHeight subscribed
439− tracePropagate (Proxy :: Proxy x) $ " isJust occ = " <> show (isJust occ)
440− tracePropagate (Proxy :: Proxy x) $ " innerHeight = " <> show innerHeight
441− liftIO $ writeIORef (coincidenceSubscribedInnerParent subscribed) $ Just innerSubd
442− scheduleClear $ coincidenceSubscribedInnerParent subscribed
443− case occ of
444− Nothing -> do
445− when (innerHeight > outerHeight) $ liftIO $ do -- If the event fires, it will fire at a later height
446− writeIORef (coincidenceSubscribedHeight subscribed) $! innerHeight
447− WeakBag.traverse (coincidenceSubscribedSubscribers subscribed) $ invalidateSubscriberHeight outerHeight
448− WeakBag.traverse (coincidenceSubscribedSubscribers subscribed) $ recalculateSubscriberHeight innerHeight
449− Just o -> do -- Since it's already firing, no need to adjust height
450− liftIO $ writeIORef (coincidenceSubscribedOccurrence subscribed) occ
451− scheduleClear $ coincidenceSubscribedOccurrence subscribed
452− propagate o $ coincidenceSubscribedSubscribers subscribed
453− , subscriberInvalidateHeight = \_ -> do
454− when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberCoincidenceOuter" <> showNodeId subscribed
455− invalidateCoincidenceHeight subscribed
456− when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberCoincidenceOuter" <> showNodeId subscribed <> " done"
457− , subscriberRecalculateHeight = \_ -> do
458− when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberCoincidenceOuter" <> showNodeId subscribed
459− recalculateCoincidenceHeight subscribed
460− when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberCoincidenceOuter" <> showNodeId subscribed <> " done"
461− }
462−
463−newSubscriberCoincidenceInner :: forall x a. HasSpiderTimeline x => CoincidenceSubscribed x a -> IO (Subscriber x a)
464−newSubscriberCoincidenceInner subscribed = return $ Subscriber
465− { subscriberPropagate = \a -> {-# SCC "traverseCoincidenceInner" #-} do
466− tracePropagate (Proxy :: Proxy x) $ "SubscriberCoincidenceInner" <> showNodeId subscribed
467− occ <- liftIO $ readIORef $ coincidenceSubscribedOccurrence subscribed
468− case occ of
469− Just _ -> return () -- SubscriberCoincidenceOuter must have already propagated this event
470− Nothing -> do
471− liftIO $ writeIORef (coincidenceSubscribedOccurrence subscribed) $ Just a
472− scheduleClear $ coincidenceSubscribedOccurrence subscribed
473− propagate a $ coincidenceSubscribedSubscribers subscribed
474− , subscriberInvalidateHeight = \_ -> do
475− when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberCoincidenceInner" <> showNodeId subscribed
476− invalidateCoincidenceHeight subscribed
477− when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberCoincidenceInner" <> showNodeId subscribed <> " done"
478− , subscriberRecalculateHeight = \_ -> do
479− when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberCoincidenceInner" <> showNodeId subscribed
480− recalculateCoincidenceHeight subscribed
481− when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberCoincidenceInner" <> showNodeId subscribed <> " done"
482− }
483−
484−invalidateSubscriberHeight :: Height -> Subscriber x a -> IO ()
485−invalidateSubscriberHeight = flip subscriberInvalidateHeight
486−
487−recalculateSubscriberHeight :: Height -> Subscriber x a -> IO ()
488−recalculateSubscriberHeight = flip subscriberRecalculateHeight
489−
490−-- | Propagate everything at the current height
491−propagate :: a -> WeakBag (Subscriber x a) -> EventM x ()
492−propagate a subscribers = withIncreasedDepth $ do
493− -- 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
494− --TODO: Should we check if nodes already have their values before propagating? Maybe we're re-doing work
495− WeakBag.traverse subscribers $ \s -> subscriberPropagate s a
496−
497−--------------------------------------------------------------------------------
498−-- EventSubscribed
499−--------------------------------------------------------------------------------
500−
501−toAny :: a -> Any
502−toAny = unsafeCoerce
503−
504−data EventSubscribed x = EventSubscribed
505− { eventSubscribedHeightRef :: {-# UNPACK #-} !(IORef Height)
506− , eventSubscribedRetained :: {-# NOUNPACK #-} !Any
507−#ifdef DEBUG_CYCLES
508− , eventSubscribedGetParents :: !(IO [Some (EventSubscribed x)]) -- For debugging loops
509− , eventSubscribedHasOwnHeightRef :: !Bool
510− , eventSubscribedWhoCreated :: !(IO [String])
511−#endif
512− }
513−
514−eventSubscribedRoot :: RootSubscribed x a -> EventSubscribed x
515−eventSubscribedRoot !r = EventSubscribed
516− { eventSubscribedHeightRef = zeroRef
517− , eventSubscribedRetained = toAny r
518−#ifdef DEBUG_CYCLES
519− , eventSubscribedGetParents = return []
520− , eventSubscribedHasOwnHeightRef = False
521− , eventSubscribedWhoCreated = return ["root"]
522−#endif
523− }
524−
525−eventSubscribedNever :: EventSubscribed x
526−eventSubscribedNever = EventSubscribed
527− { eventSubscribedHeightRef = zeroRef
528− , eventSubscribedRetained = toAny ()
529−#ifdef DEBUG_CYCLES
530− , eventSubscribedGetParents = return []
531− , eventSubscribedHasOwnHeightRef = False
532− , eventSubscribedWhoCreated = return ["never"]
533−#endif
534− }
535−
536−eventSubscribedFan :: FanSubscribed x k -> EventSubscribed x
537−eventSubscribedFan !subscribed = EventSubscribed
538− { eventSubscribedHeightRef = eventSubscribedHeightRef $ _eventSubscription_subscribed $ fanSubscribedParent subscribed
539− , eventSubscribedRetained = toAny subscribed
540−#ifdef DEBUG_CYCLES
541− , eventSubscribedGetParents = return [Some.This $ _eventSubscription_subscribed $ fanSubscribedParent subscribed]
542− , eventSubscribedHasOwnHeightRef = False
543− , eventSubscribedWhoCreated = whoCreatedIORef $ fanSubscribedCachedSubscribed subscribed
544−#endif
545− }
546−
547−eventSubscribedSwitch :: SwitchSubscribed x a -> EventSubscribed x
548−eventSubscribedSwitch !subscribed = EventSubscribed
549− { eventSubscribedHeightRef = switchSubscribedHeight subscribed
550− , eventSubscribedRetained = toAny subscribed
551−#ifdef DEBUG_CYCLES
552− , eventSubscribedGetParents = do
553− s <- readIORef $ switchSubscribedCurrentParent subscribed
554− return [Some.This $ _eventSubscription_subscribed s]
555− , eventSubscribedHasOwnHeightRef = True
556− , eventSubscribedWhoCreated = whoCreatedIORef $ switchSubscribedCachedSubscribed subscribed
557−#endif
558− }
559−
560−eventSubscribedCoincidence :: CoincidenceSubscribed x a -> EventSubscribed x
561−eventSubscribedCoincidence !subscribed = EventSubscribed
562− { eventSubscribedHeightRef = coincidenceSubscribedHeight subscribed
563− , eventSubscribedRetained = toAny subscribed
564−#ifdef DEBUG_CYCLES
565− , eventSubscribedGetParents = do
566− innerSubscription <- readIORef $ coincidenceSubscribedInnerParent subscribed
567− let outerParent = Some.This $ _eventSubscription_subscribed $ coincidenceSubscribedOuterParent subscribed
568− innerParents = maybeToList $ fmap Some.This innerSubscription
569− return $ outerParent : innerParents
570− , eventSubscribedHasOwnHeightRef = True
571− , eventSubscribedWhoCreated = whoCreatedIORef $ coincidenceSubscribedCachedSubscribed subscribed
572−#endif
573− }
574−
575−getEventSubscribedHeight :: EventSubscribed x -> IO Height
576−getEventSubscribedHeight es = readIORef $ eventSubscribedHeightRef es
577−
578−#ifdef DEBUG_CYCLES
579−whoCreatedEventSubscribed :: EventSubscribed x -> IO [String]
580−whoCreatedEventSubscribed = eventSubscribedWhoCreated
581−
582−walkInvalidHeightParents :: EventSubscribed x -> IO [Some (EventSubscribed x)]
583−walkInvalidHeightParents s0 = do
584− subscribers <- flip execStateT mempty $ ($ Some.This s0) $ fix $ \loop (Some.This s) -> do
585− h <- liftIO $ readIORef $ eventSubscribedHeightRef s
586− when (h == invalidHeight) $ do
587− when (eventSubscribedHasOwnHeightRef s) $ liftIO $ writeIORef (eventSubscribedHeightRef s) $! invalidHeightBeingTraversed
588− modify (Some.This s :)
589− mapM_ loop =<< liftIO (eventSubscribedGetParents s)
590− forM_ subscribers $ \(Some.This s) -> writeIORef (eventSubscribedHeightRef s) $! invalidHeight
591− return subscribers
592−#endif
593−
594−{-# INLINE subscribeHoldEvent #-}
595−subscribeHoldEvent :: CanSubscribe x m => Hold x p -> Subscriber x p -> m (EventSubscription x, Maybe p)
596−subscribeHoldEvent = subscribeAndRead . holdEvent
597−
598−--------------------------------------------------------------------------------
599−-- Behavior
600−--------------------------------------------------------------------------------
601−
602−newtype Behavior x a = Behavior { readBehaviorTracked :: BehaviorM x a }
603−
604−behaviorHold :: Hold x p -> Behavior x (PatchTarget p)
605−behaviorHold !h = Behavior $ readHoldTracked h
606−
607−behaviorHoldIdentity :: Hold x (Identity a) -> Behavior x a
608−behaviorHoldIdentity = behaviorHold
609−
610−behaviorConst :: a -> Behavior x a
611−behaviorConst !a = Behavior $ return a
612−
613−behaviorPull :: Pull x a -> Behavior x a
614−behaviorPull !p = Behavior $ do
615− val <- liftIO $ readIORef $ pullValue p
616− case val of
617− Just subscribed -> do
618− askParentsRef >>= mapM_ (\r -> liftIO $ modifyIORef' r (SomeBehaviorSubscribed (BehaviorSubscribedPull subscribed) :))
619− askInvalidator >>= mapM_ (\wi -> liftIO $ modifyIORef' (pullSubscribedInvalidators subscribed) (wi:))
620− liftIO $ touch $ pullSubscribedOwnInvalidator subscribed
621− return $ pullSubscribedValue subscribed
622− Nothing -> do
623− i <- liftIO $ newInvalidatorPull p
624− wi <- liftIO $ mkWeakPtrWithDebug i "InvalidatorPull"
625− parentsRef <- liftIO $ newIORef []
626− holdInits <- askBehaviorHoldInits
627− a <- liftIO $ runReaderT (unBehaviorM $ pullCompute p) (Just (wi, parentsRef), holdInits)
628− invsRef <- liftIO . newIORef . maybeToList =<< askInvalidator
629− parents <- liftIO $ readIORef parentsRef
630− let subscribed = PullSubscribed
631− { pullSubscribedValue = a
632− , pullSubscribedInvalidators = invsRef
633− , pullSubscribedOwnInvalidator = i
634− , pullSubscribedParents = parents
635− }
636− liftIO $ writeIORef (pullValue p) $ Just subscribed
637− askParentsRef >>= mapM_ (\r -> liftIO $ modifyIORef' r (SomeBehaviorSubscribed (BehaviorSubscribedPull subscribed) :))
638− return a
639−
640−behaviorDyn :: Patch p => Dyn x p -> Behavior x (PatchTarget p)
641−behaviorDyn !d = Behavior $ readHoldTracked =<< getDynHold d
642−
643−{-# INLINE readHoldTracked #-}
644−readHoldTracked :: Hold x p -> BehaviorM x (PatchTarget p)
645−readHoldTracked h = do
646− result <- liftIO $ readIORef $ holdValue h
647− askInvalidator >>= mapM_ (\wi -> liftIO $ modifyIORef' (holdInvalidators h) (wi:))
648− askParentsRef >>= mapM_ (\r -> liftIO $ modifyIORef' r (SomeBehaviorSubscribed (BehaviorSubscribedHold h) :))
649− return result
650−
651−{-# INLINABLE readBehaviorUntracked #-}
652−readBehaviorUntracked :: Defer (SomeHoldInit x) m => Behavior x a -> m a
653−readBehaviorUntracked b = do
654− holdInits <- getDeferralQueue
655− liftIO $ runBehaviorM (readBehaviorTracked b) Nothing holdInits --TODO: Specialize readBehaviorTracked to the Nothing and Just cases
656−
657−--------------------------------------------------------------------------------
658−-- Dynamic
659−--------------------------------------------------------------------------------
660−
661−data Dynamic x p = Dynamic
662− { dynamicCurrent :: !(Behavior x (PatchTarget p))
663− , dynamicUpdated :: !(Event x p)
664− }
665−
666−dynamicHold :: HasSpiderTimeline x => Hold x p -> Dynamic x p
667−dynamicHold !h = Dynamic
668− { dynamicCurrent = behaviorHold h
669− , dynamicUpdated = eventHold h
670− }
671−
672−dynamicHoldIdentity :: HasSpiderTimeline x => Hold x (Identity a) -> Dynamic x (Identity a)
673−dynamicHoldIdentity = dynamicHold
674−
675−dynamicConst :: PatchTarget p -> Dynamic x p
676−dynamicConst !a = Dynamic
677− { dynamicCurrent = behaviorConst a
678− , dynamicUpdated = eventNever
679− }
680−
681−dynamicDyn :: (HasSpiderTimeline x, Patch p) => Dyn x p -> Dynamic x p
682−dynamicDyn !d = Dynamic
683− { dynamicCurrent = behaviorDyn d
684− , dynamicUpdated = eventDyn d
685− }
686−
687−dynamicDynIdentity :: HasSpiderTimeline x => Dyn x (Identity a) -> Dynamic x (Identity a)
688−dynamicDynIdentity = dynamicDyn
689−
690−--------------------------------------------------------------------------------
691−-- Combinators
692−--------------------------------------------------------------------------------
693−
694−--TODO: Figure out why certain things are not 'representational', then make them
695−--representational so we can use coerce
696−
697−--type role Hold representational
698−data Hold x p
699− = Hold { holdValue :: !(IORef (PatchTarget p))
700− , holdInvalidators :: !(IORef [Weak (Invalidator x)])
701− , holdEvent :: Event x p -- This must be lazy, or holds cannot be defined before their input Events
702− , holdParent :: !(IORef (Maybe (EventSubscription x))) -- Keeps its parent alive (will be undefined until the hold is initialized) --TODO: Probably shouldn't be an IORef
703−#ifdef DEBUG_NODEIDS
704− , holdNodeId :: Int
705−#endif
706− }
707−
708−-- | A statically allocated 'SpiderTimeline'; this is the only instance of
709−-- 'SpiderTimeline' that can used when using
710−-- -fspecialize-to-spidertimeline-global.
711−data Global
712−
713−{-# NOINLINE globalSpiderTimelineEnv #-}
714−globalSpiderTimelineEnv :: SpiderTimelineEnv Global
715−globalSpiderTimelineEnv = unsafePerformIO unsafeNewSpiderTimelineEnv
716−
717−-- | Stores all global data relevant to a particular Spider timeline; only one
718−-- value should exist for each type @x@
719−data SpiderTimelineEnv x = SpiderTimelineEnv
720− { _spiderTimeline_lock :: {-# UNPACK #-} !(MVar ())
721− , _spiderTimeline_eventEnv :: {-# UNPACK #-} !(EventEnv x)
722−#ifdef DEBUG
723− , _spiderTimeline_depth :: {-# UNPACK #-} !(IORef Int)
724−#endif
725− }
726−type role SpiderTimelineEnv nominal
727−
728−instance GEq SpiderTimelineEnv where
729− a `geq` b = if _spiderTimeline_lock a == _spiderTimeline_lock b
730− then Just $ unsafeCoerce Refl -- This unsafeCoerce is safe because the same SpiderTimelineEnv can't have two different 'x' arguments
731− else Nothing
732−
733−data EventEnv x
734− = EventEnv { eventEnvAssignments :: !(IORef [SomeAssignment x]) -- Needed for Subscribe
735− , eventEnvHoldInits :: !(IORef [SomeHoldInit x]) -- Needed for Subscribe
736− , eventEnvMergeUpdates :: !(IORef [SomeMergeUpdate x])
737− , eventEnvMergeInits :: !(IORef [SomeMergeInit x]) -- Needed for Subscribe
738− , eventEnvClears :: !(IORef [SomeClear]) -- Needed for Subscribe
739− , eventEnvRootClears :: !(IORef [SomeRootClear])
740− , eventEnvCurrentHeight :: !(IORef Height) -- Needed for Subscribe
741− , eventEnvResetCoincidences :: !(IORef [SomeResetCoincidence x]) -- Needed for Subscribe
742− , eventEnvDelayedMerges :: !(IORef (IntMap [EventM x ()]))
743− }
744−
745−{-# INLINE runEventM #-}
746−runEventM :: EventM x a -> IO a
747−runEventM = unEventM
748−
749−asksEventEnv :: forall x a. HasSpiderTimeline x => (EventEnv x -> a) -> EventM x a
750−asksEventEnv f = return $ f $ _spiderTimeline_eventEnv (spiderTimeline :: SpiderTimelineEnv x)
751−
752−class MonadIO m => Defer a m where
753− getDeferralQueue :: m (IORef [a])
754−
755−{-# INLINE defer #-}
756−defer :: Defer a m => a -> m ()
757−defer a = do
758− q <- getDeferralQueue
759− liftIO $ modifyIORef' q (a:)
760−
761−instance HasSpiderTimeline x => Defer (SomeAssignment x) (EventM x) where
762− {-# INLINE getDeferralQueue #-}
763− getDeferralQueue = asksEventEnv eventEnvAssignments
764−
765−instance HasSpiderTimeline x => Defer (SomeHoldInit x) (EventM x) where
766− {-# INLINE getDeferralQueue #-}
767− getDeferralQueue = asksEventEnv eventEnvHoldInits
768−
769−instance Defer (SomeHoldInit x) (BehaviorM x) where
770− {-# INLINE getDeferralQueue #-}
771− getDeferralQueue = BehaviorM $ asks snd
772−
773−instance HasSpiderTimeline x => Defer (SomeMergeUpdate x) (EventM x) where
774− {-# INLINE getDeferralQueue #-}
775− getDeferralQueue = asksEventEnv eventEnvMergeUpdates
776−
777−instance HasSpiderTimeline x => Defer (SomeMergeInit x) (EventM x) where
778− {-# INLINE getDeferralQueue #-}
779− getDeferralQueue = asksEventEnv eventEnvMergeInits
780−
781−class HasSpiderTimeline x => HasCurrentHeight x m | m -> x where
782− getCurrentHeight :: m Height
783− scheduleMerge :: Height -> EventM x () -> m ()
784−
785−instance HasSpiderTimeline x => HasCurrentHeight x (EventM x) where
786− {-# INLINE getCurrentHeight #-}
787− getCurrentHeight = do
788− heightRef <- asksEventEnv eventEnvCurrentHeight
789− liftIO $ readIORef heightRef
790− {-# INLINE scheduleMerge #-}
791− scheduleMerge height subscribed = do
792− delayedRef <- asksEventEnv eventEnvDelayedMerges
793− liftIO $ modifyIORef' delayedRef $ IntMap.insertWith (++) (unHeight height) [subscribed]
794−
795−#ifdef SPECIALIZE_TO_SPIDERTIMELINE_GLOBAL
796−class x ~ Global => HasSpiderTimeline x where
797−#else
798−class HasSpiderTimeline x where
799−#endif
800− -- | Retrieve the current SpiderTimelineEnv
801− spiderTimeline :: SpiderTimelineEnv x
802−
803−instance HasSpiderTimeline Global where
804− spiderTimeline = globalSpiderTimelineEnv
805−
806−putCurrentHeight :: HasSpiderTimeline x => Height -> EventM x ()
807−putCurrentHeight h = do
808− heightRef <- asksEventEnv eventEnvCurrentHeight
809− liftIO $ writeIORef heightRef $! h
810−
811−instance HasSpiderTimeline x => Defer SomeClear (EventM x) where
812− {-# INLINE getDeferralQueue #-}
813− getDeferralQueue = asksEventEnv eventEnvClears
814−
815−{-# INLINE scheduleClear #-}
816−scheduleClear :: Defer SomeClear m => IORef (Maybe a) -> m ()
817−scheduleClear r = defer $ SomeClear r
818−
819−instance HasSpiderTimeline x => Defer SomeRootClear (EventM x) where
820− {-# INLINE getDeferralQueue #-}
821− getDeferralQueue = asksEventEnv eventEnvRootClears
822−
823−{-# INLINE scheduleRootClear #-}
824−scheduleRootClear :: Defer SomeRootClear m => IORef (DMap k Identity) -> m ()
825−scheduleRootClear r = defer $ SomeRootClear r
826−
827−instance HasSpiderTimeline x => Defer (SomeResetCoincidence x) (EventM x) where
828− {-# INLINE getDeferralQueue #-}
829− getDeferralQueue = asksEventEnv eventEnvResetCoincidences
830−
831−-- Note: hold cannot examine its event until after the phase is over
832−{-# INLINE [1] hold #-}
833−hold :: (Patch p, Defer (SomeHoldInit x) m) => PatchTarget p -> Event x p -> m (Hold x p)
834−hold v0 e = do
835− valRef <- liftIO $ newIORef v0
836− invsRef <- liftIO $ newIORef []
837− parentRef <- liftIO $ newIORef Nothing
838−#ifdef DEBUG_NODEIDS
839− nodeId <- liftIO newNodeId
840−#endif
841− let h = Hold
842− { holdValue = valRef
843− , holdInvalidators = invsRef
844− , holdEvent = e
845− , holdParent = parentRef
846−#ifdef DEBUG_NODEIDS
847− , holdNodeId = nodeId
848−#endif
849− }
850− defer $ SomeHoldInit h
851− return h
852−
853−{-# INLINE getHoldEventSubscription #-}
854−getHoldEventSubscription :: forall m p x. (Defer (SomeAssignment x) m, Defer (SomeHoldInit x) m, Defer SomeClear m, Patch p, HasCurrentHeight x m, Defer (SomeMergeInit x) m, Defer (SomeResetCoincidence x) m, HasSpiderTimeline x, m ~ EventM x) => Hold x p -> m (EventSubscription x)
855−getHoldEventSubscription h = do
856− ep <- liftIO $ readIORef $ holdParent h
857− case ep of
858− Just subd -> return subd
859− Nothing -> do
860− let e = holdEvent h
861− subscriptionRef <- liftIO $ newIORef $ error "getHoldEventSubscription: subdRef uninitialized"
862− (subscription@(EventSubscription _ _), occ) <- subscribeAndRead e =<< liftIO (newSubscriberHold h)
863− liftIO $ writeIORef subscriptionRef $! subscription
864− case occ of
865− Nothing -> return ()
866− Just o -> do
867− old <- liftIO $ readIORef $ holdValue h
868− case apply o old of
869− Nothing -> return ()
870− Just new -> do
871− -- Need to evaluate these so that we don't retain the Hold itself
872− v <- liftIO $ evaluate $ holdValue h
873− i <- liftIO $ evaluate $ holdInvalidators h
874− defer $ SomeAssignment v i new
875− liftIO $ writeIORef (holdParent h) $ Just subscription
876− return subscription
877−
878−type BehaviorEnv x = (Maybe (Weak (Invalidator x), IORef [SomeBehaviorSubscribed x]), IORef [SomeHoldInit x])
879−
880−--type role BehaviorM representational
881−-- BehaviorM can sample behaviors
882−newtype BehaviorM x a = BehaviorM { unBehaviorM :: ReaderT (BehaviorEnv x) IO a } deriving (Functor, Applicative, MonadIO, MonadFix)
883−
884−instance Monad (BehaviorM x) where
885− {-# INLINE (>>=) #-}
886− BehaviorM x >>= f = BehaviorM $ x >>= unBehaviorM . f
887− {-# INLINE (>>) #-}
888− BehaviorM x >> BehaviorM y = BehaviorM $ x >> y
889− {-# INLINE return #-}
890− return x = BehaviorM $ return x
891− {-# INLINE fail #-}
892− fail s = BehaviorM $ fail s
893−
894−data BehaviorSubscribed x a
895− = forall p. BehaviorSubscribedHold (Hold x p)
896− | BehaviorSubscribedPull (PullSubscribed x a)
897−
898−data SomeBehaviorSubscribed x = forall a. SomeBehaviorSubscribed (BehaviorSubscribed x a)
899−
900−--type role PullSubscribed representational
901−data PullSubscribed x a
902− = PullSubscribed { pullSubscribedValue :: !a
903− , pullSubscribedInvalidators :: !(IORef [Weak (Invalidator x)])
904− , pullSubscribedOwnInvalidator :: !(Invalidator x)
905− , pullSubscribedParents :: ![SomeBehaviorSubscribed x] -- Need to keep parent behaviors alive, or they won't let us know when they're invalidated
906− }
907−
908−--type role Pull representational
909−data Pull x a
910− = Pull { pullValue :: !(IORef (Maybe (PullSubscribed x a)))
911− , pullCompute :: !(BehaviorM x a)
912−#ifdef DEBUG_NODEIDS
913− , pullNodeId :: Int
914−#endif
915− }
916−
917−data Invalidator x
918− = forall a. InvalidatorPull (Pull x a)
919− | forall a. InvalidatorSwitch (SwitchSubscribed x a)
920−
921−data RootSubscribed x a = forall k. GCompare k => RootSubscribed
922− { rootSubscribedKey :: !(k a)
923− , rootSubscribedCachedSubscribed :: !(IORef (DMap k (RootSubscribed x))) -- From the original Root
924− , rootSubscribedSubscribers :: !(WeakBag (Subscriber x a))
925− , rootSubscribedOccurrence :: !(IO (Maybe a)) -- Lookup from rootOccurrence
926− , rootSubscribedUninit :: IO ()
927− , 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?
928−#ifdef DEBUG_NODEIDS
929− , rootSubscribedNodeId :: Int
930−#endif
931− }
932−
933−data Root x (k :: * -> *)
934− = Root { rootOccurrence :: !(IORef (DMap k Identity)) -- The currently-firing occurrence of this event
935− , rootSubscribed :: !(IORef (DMap k (RootSubscribed x)))
936− , rootInit :: !(forall a. k a -> RootTrigger x a -> IO (IO ()))
937− }
938−
939−data SomeHoldInit x = forall p. Patch p => SomeHoldInit !(Hold x p)
940−
941−data SomeMergeUpdate x = SomeMergeUpdate
942− { _someMergeUpdate_update :: !(EventM x [EventSubscription x])
943− , _someMergeUpdate_invalidateHeight :: !(IO ())
944− , _someMergeUpdate_recalculateHeight :: !(IO ())
945− }
946−
947−newtype SomeMergeInit x = SomeMergeInit { unSomeMergeInit :: EventM x () }
948−
949−-- EventM can do everything BehaviorM can, plus create holds
950−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
951−
952−newtype ComputeM x a = ComputeM (ReaderT (IORef [SomeHoldInit x]) IO a) deriving (Functor, Applicative, Monad, MonadIO, MonadFix)
953−
954−instance Defer (SomeHoldInit x) (ComputeM x) where
955− getDeferralQueue = ComputeM ask
956−
957−{-# INLINABLE runComputeM #-}
958−runComputeM :: Defer (SomeHoldInit x) m => ComputeM x a -> m a
959−runComputeM (ComputeM a) = liftIO . runReaderT a =<< getDeferralQueue
960−
961−newtype MergeSubscribedParent x a = MergeSubscribedParent { unMergeSubscribedParent :: EventSubscription x }
962−
963−data MergeSubscribedParentWithMove x k a = MergeSubscribedParentWithMove
964− { _mergeSubscribedParentWithMove_subscription :: !(EventSubscription x)
965− , _mergeSubscribedParentWithMove_key :: !(IORef (k a))
966− }
967−
968−data HeightBag = HeightBag
969− { _heightBag_size :: {-# UNPACK #-} !Int
970− , _heightBag_contents :: !(IntMap Word) -- Number of excess in each bucket
971− }
972− deriving (Show, Read, Eq, Ord)
973−
974−heightBagEmpty :: HeightBag
975−heightBagEmpty = heightBagVerify $ HeightBag 0 IntMap.empty
976−
977−heightBagSize :: HeightBag -> Int
978−heightBagSize = _heightBag_size
979−
980−heightBagFromList :: [Height] -> HeightBag
981−heightBagFromList heights = heightBagVerify $ foldl' (flip heightBagAdd) heightBagEmpty heights
982−
983−heightBagAdd :: Height -> HeightBag -> HeightBag
984−heightBagAdd (Height h) (HeightBag s c) = heightBagVerify $ HeightBag (succ s) $ IntMap.insertWithKey (\_ _ old -> succ old) h 0 c
985−
986−heightBagRemove :: Height -> HeightBag -> HeightBag
987−heightBagRemove (Height h) b@(HeightBag s c) = heightBagVerify $ case IntMap.lookup h c of
988− Nothing -> error $ "heightBagRemove: Height " <> show h <> " not present in bag " <> show b
989− Just old -> HeightBag (pred s) $ case old of
990− 0 -> IntMap.delete h c
991− _ -> IntMap.insert h (pred old) c
992−
993−heightBagMax :: HeightBag -> Height
994−heightBagMax (HeightBag _ c) = case IntMap.maxViewWithKey c of
995− Just ((h, _), _) -> Height h
996− Nothing -> zeroHeight
997−
998−heightBagVerify :: HeightBag -> HeightBag
999−#ifdef DEBUG
1000−heightBagVerify b@(HeightBag s c) = if
1001− | s /= IntMap.size c + fromIntegral (sum (IntMap.elems c))
1002− -> error $ "heightBagVerify: size doesn't match: " <> show b
1003− | unHeight invalidHeight `IntMap.member` c
1004− -> error $ "heightBagVerify: contains invalid height: " <> show b
1005− | otherwise -> b
1006−#else
1007−heightBagVerify = id
1008−#endif
1009−
1010−data FanSubscribedChildren (x :: *) k a = FanSubscribedChildren
1011− { _fanSubscribedChildren_list :: !(WeakBag (Subscriber x a))
1012− , _fanSubscribedChildren_self :: {-# NOUNPACK #-} !(k a, FanSubscribed x k)
1013− , _fanSubscribedChildren_weakSelf :: !(IORef (Weak (k a, FanSubscribed x k)))
1014− }
1015−
1016−data FanSubscribed (x :: *) k
1017− = FanSubscribed { fanSubscribedCachedSubscribed :: !(IORef (Maybe (FanSubscribed x k)))
1018− , fanSubscribedOccurrence :: !(IORef (Maybe (DMap k Identity)))
1019− , fanSubscribedSubscribers :: !(IORef (DMap k (FanSubscribedChildren x k))) -- This DMap should never be empty
1020− , fanSubscribedParent :: !(EventSubscription x)
1021−#ifdef DEBUG_NODEIDS
1022− , fanSubscribedNodeId :: Int
1023−#endif
1024− }
1025−
1026−data Fan x k
1027− = Fan { fanParent :: !(Event x (DMap k Identity))
1028− , fanSubscribed :: !(IORef (Maybe (FanSubscribed x k)))
1029− }
1030−
1031−data SwitchSubscribed x a
1032− = SwitchSubscribed { switchSubscribedCachedSubscribed :: !(IORef (Maybe (SwitchSubscribed x a)))
1033− , switchSubscribedOccurrence :: !(IORef (Maybe a))
1034− , switchSubscribedHeight :: !(IORef Height)
1035− , switchSubscribedSubscribers :: !(WeakBag (Subscriber x a))
1036− , switchSubscribedOwnInvalidator :: {-# NOUNPACK #-} !(Invalidator x)
1037− , switchSubscribedOwnWeakInvalidator :: !(IORef (Weak (Invalidator x)))
1038− , switchSubscribedBehaviorParents :: !(IORef [SomeBehaviorSubscribed x])
1039− , switchSubscribedParent :: !(Behavior x (Event x a))
1040− , switchSubscribedCurrentParent :: !(IORef (EventSubscription x))
1041− , switchSubscribedWeakSelf :: !(IORef (Weak (SwitchSubscribed x a)))
1042−#ifdef DEBUG_NODEIDS
1043− , switchSubscribedNodeId :: Int
1044−#endif
1045− }
1046−
1047−data Switch x a
1048− = Switch { switchParent :: !(Behavior x (Event x a))
1049− , switchSubscribed :: !(IORef (Maybe (SwitchSubscribed x a)))
1050− }
1051−
1052−#ifdef USE_TEMPLATE_HASKELL
1053−{-# ANN CoincidenceSubscribed "HLint: ignore Redundant bracket" #-}
1054−#endif
1055−data CoincidenceSubscribed x a
1056− = CoincidenceSubscribed { coincidenceSubscribedCachedSubscribed :: !(IORef (Maybe (CoincidenceSubscribed x a)))
1057− , coincidenceSubscribedOccurrence :: !(IORef (Maybe a))
1058− , coincidenceSubscribedSubscribers :: !(WeakBag (Subscriber x a))
1059− , coincidenceSubscribedHeight :: !(IORef Height)
1060− , coincidenceSubscribedOuter :: {-# NOUNPACK #-} (Subscriber x (Event x a))
1061− , coincidenceSubscribedOuterParent :: !(EventSubscription x)
1062− , coincidenceSubscribedInnerParent :: !(IORef (Maybe (EventSubscribed x)))
1063− , coincidenceSubscribedWeakSelf :: !(IORef (Weak (CoincidenceSubscribed x a)))
1064−#ifdef DEBUG_NODEIDS
1065− , coincidenceSubscribedNodeId :: Int
1066−#endif
1067− }
1068−
1069−data Coincidence x a
1070− = Coincidence { coincidenceParent :: !(Event x (Event x a))
1071− , coincidenceSubscribed :: !(IORef (Maybe (CoincidenceSubscribed x a)))
1072− }
1073−
1074−{-# NOINLINE newInvalidatorSwitch #-}
1075−newInvalidatorSwitch :: SwitchSubscribed x a -> IO (Invalidator x)
1076−newInvalidatorSwitch subd = return $! InvalidatorSwitch subd
1077−
1078−{-# NOINLINE newInvalidatorPull #-}
1079−newInvalidatorPull :: Pull x a -> IO (Invalidator x)
1080−newInvalidatorPull p = return $! InvalidatorPull p
1081−
1082−instance HasSpiderTimeline x => FunctorMaybe (Event x) where
1083− fmapMaybe f = push $ return . f
1084−
1085−instance HasSpiderTimeline x => Align (Event x) where
1086− nil = eventNever
1087− align ea eb = fmapMaybe dmapToThese $ merge $ dynamicConst $ DMap.fromList [LeftTag :=> ea, RightTag :=> eb]
1088−
1089−newtype Dyn x p = Dyn { unDyn :: IORef (Either (BehaviorM x (PatchTarget p), Event x p) (Hold x p)) }
1090−
1091−newMapDyn :: HasSpiderTimeline x => (a -> b) -> Dynamic x (Identity a) -> Dynamic x (Identity b)
1092−newMapDyn f d = dynamicDynIdentity $ unsafeDyn (fmap f $ readBehaviorTracked $ dynamicCurrent d) (Identity . f . runIdentity <$> dynamicUpdated d)
1093−
1094−--TODO: Avoid the duplication between this and R.zipDynWith
1095−zipDynWith :: HasSpiderTimeline x => (a -> b -> c) -> Dynamic x (Identity a) -> Dynamic x (Identity b) -> Dynamic x (Identity c)
1096−zipDynWith f da db =
1097− let eab = align (dynamicUpdated da) (dynamicUpdated db)
1098− ec = flip push eab $ \o -> do
1099− (a, b) <- case o of
1100− This (Identity a) -> do
1101− b <- readBehaviorUntracked $ dynamicCurrent db
1102− return (a, b)
1103− That (Identity b) -> do
1104− a <- readBehaviorUntracked $ dynamicCurrent da
1105− return (a, b)
1106− These (Identity a) (Identity b) -> return (a, b)
1107− return $ Just $ Identity $ f a b
1108− in dynamicDynIdentity $ unsafeDyn (f <$> readBehaviorUntracked (dynamicCurrent da) <*> readBehaviorUntracked (dynamicCurrent db)) ec
1109−
1110−unsafeDyn :: BehaviorM x (PatchTarget p) -> Event x p -> Dyn x p
1111−unsafeDyn readV0 v' = Dyn $ unsafeNewIORef x $ Left x
1112− where x = (readV0, v')
1113−
1114−-- ResultM can read behaviors and events
1115−type ResultM = EventM
1116−
1117−{-# NOINLINE unsafeNewIORef #-}
1118−unsafeNewIORef :: a -> b -> IORef b
1119−unsafeNewIORef _ b = unsafePerformIO $ newIORef b
1120−
1121−instance HasSpiderTimeline x => Functor (Event x) where
1122− fmap f = push $ return . Just . f
1123−
1124−instance Functor (Behavior x) where
1125− fmap f = pull . fmap f . readBehaviorTracked
1126−
1127−{-# INLINE push #-}
1128−push :: HasSpiderTimeline x => (a -> ComputeM x (Maybe b)) -> Event x a -> Event x b
1129−push f e = cacheEvent (pushCheap f e)
1130−
1131−{-# INLINABLE pull #-}
1132−pull :: BehaviorM x a -> Behavior x a
1133−pull a = behaviorPull $ Pull
1134− { pullCompute = a
1135− , pullValue = unsafeNewIORef a Nothing
1136−#ifdef DEBUG_NODEIDS
1137− , pullNodeId = unsafeNodeId a
1138−#endif
1139− }
1140−
1141−{-# INLINABLE switch #-}
1142−switch :: HasSpiderTimeline x => Behavior x (Event x a) -> Event x a
1143−switch a = eventSwitch $ Switch
1144− { switchParent = a
1145− , switchSubscribed = unsafeNewIORef a Nothing
1146− }
1147−
1148−coincidence :: HasSpiderTimeline x => Event x (Event x a) -> Event x a
1149−coincidence a = eventCoincidence $ Coincidence
1150− { coincidenceParent = a
1151− , coincidenceSubscribed = unsafeNewIORef a Nothing
1152− }
1153−
1154−-- Propagate the given event occurrence; before cleaning up, run the given action, which may read the state of events and behaviors
1155−run :: forall x b. HasSpiderTimeline x => [DSum (RootTrigger x) Identity] -> ResultM x b -> SpiderHost x b
1156−run roots after = do
1157− tracePropagate (Proxy :: Proxy x) $ "Running an event frame with " <> show (length roots) <> " events"
1158− t <- SpiderHost ask
1159− result <- SpiderHost $ lift $ withMVar (_spiderTimeline_lock t) $ \_ -> flip runReaderT t $ unSpiderHost $ runFrame $ do
1160− rootsToPropagate <- forM roots $ \r@(RootTrigger (_, occRef, k) :=> a) -> do
1161− occBefore <- liftIO $ do
1162− occBefore <- readIORef occRef
1163− writeIORef occRef $! DMap.insert k a occBefore
1164− return occBefore
1165− if DMap.null occBefore
1166− then do scheduleRootClear occRef
1167− return $ Just r
1168− else return Nothing
1169− forM_ (catMaybes rootsToPropagate) $ \(RootTrigger (subscribersRef, _, _) :=> Identity a) -> do
1170− propagate a subscribersRef
1171− delayedRef <- asksEventEnv eventEnvDelayedMerges
1172− let go = do
1173− delayed <- liftIO $ readIORef delayedRef
1174− case IntMap.minViewWithKey delayed of
1175− Nothing -> return ()
1176− Just ((currentHeight, cur), future) -> do
1177− tracePropagate (Proxy :: Proxy x) $ "Running height " ++ show currentHeight
1178− putCurrentHeight $ Height currentHeight
1179− liftIO $ writeIORef delayedRef $! future
1180− sequence_ cur
1181− go
1182− go
1183− putCurrentHeight maxBound
1184− after
1185− tracePropagate (Proxy :: Proxy x) "Done running an event frame"
1186− return result
1187−
1188−scheduleMerge' :: HasSpiderTimeline x => Height -> IORef Height -> EventM x () -> EventM x ()
1189−scheduleMerge' initialHeight heightRef a = scheduleMerge initialHeight $ do
1190− height <- liftIO $ readIORef heightRef
1191− currentHeight <- getCurrentHeight
1192− case height `compare` currentHeight of
1193− LT -> error "Somehow a merge's height has been decreased after it was scheduled"
1194− GT -> scheduleMerge' height heightRef a -- The height has been increased (by a coincidence event; TODO: is this the only way?)
1195− EQ -> a
1196−
1197−data SomeClear = forall a. SomeClear (IORef (Maybe a))
1198−
1199−data SomeRootClear = forall k. SomeRootClear (IORef (DMap k Identity))
1200−
1201−data SomeAssignment x = forall a. SomeAssignment {-# UNPACK #-} !(IORef a) {-# UNPACK #-} !(IORef [Weak (Invalidator x)]) a
1202−
1203−debugFinalize :: Bool
1204−debugFinalize = False
1205−
1206−mkWeakPtrWithDebug :: a -> String -> IO (Weak a)
1207−mkWeakPtrWithDebug x debugNote = do
1208− x' <- evaluate x
1209− mkWeakPtr x' $
1210− if debugFinalize
1211− then Just $ putStrLn $ "finalizing: " ++ debugNote
1212− else Nothing
1213−
1214−type WeakList a = [Weak a]
1215−
1216−{-# INLINE withIncreasedDepth #-}
1217−#ifdef DEBUG
1218−withIncreasedDepth :: CanTrace x m => m a -> m a
1219−withIncreasedDepth a = do
1220− spiderTimeline <- askSpiderTimelineEnv
1221− liftIO $ modifyIORef' (_spiderTimeline_depth spiderTimeline) succ
1222− result <- a
1223− liftIO $ modifyIORef' (_spiderTimeline_depth spiderTimeline) pred
1224− return result
1225−#else
1226−withIncreasedDepth :: m a -> m a
1227−withIncreasedDepth = id
1228−#endif
1229−
1230−type CanTrace x m = (HasSpiderTimeline x, MonadIO m)
1231−
1232−{-# INLINE tracePropagate #-}
1233−tracePropagate :: (CanTrace x m) => proxy x -> String -> m ()
1234−tracePropagate p = traceWhen p debugPropagate
1235−
1236−{-# INLINE traceInvalidate #-}
1237−traceInvalidate :: String -> IO ()
1238−traceInvalidate = when debugInvalidate . liftIO . putStrLn
1239−
1240−{-# INLINE traceWhen #-}
1241−traceWhen :: (CanTrace x m) => proxy x -> Bool -> String -> m ()
1242−traceWhen p b message = traceMWhen p b $ return message
1243−
1244−{-# INLINE traceMWhen #-}
1245−traceMWhen :: (CanTrace x m) => proxy x -> Bool -> m String -> m ()
1246−traceMWhen _ b getMessage = when b $ do
1247− message <- getMessage
1248−#ifdef DEBUG
1249− spiderTimeline <- askSpiderTimelineEnv
1250− d <- liftIO $ readIORef $ _spiderTimeline_depth spiderTimeline
1251−#else
1252− let d = 0
1253−#endif
1254− liftIO $ putStrLn $ replicate d ' ' <> message
1255−
1256−whoCreatedIORef :: IORef a -> IO [String]
1257−whoCreatedIORef (IORef a) = whoCreated $! a
1258−
1259−#ifdef DEBUG_CYCLES
1260−groupByHead :: Eq a => [NonEmpty a] -> [(a, NonEmpty [a])]
1261−groupByHead = \case
1262− [] -> []
1263− (x :| xs) : t -> case groupByHead t of
1264− [] -> [(x, xs :| [])]
1265− l@((y, yss) : t')
1266− | x == y -> (x, xs `NonEmpty.cons` yss) : t'
1267− | otherwise -> (x, xs :| []) : l
1268−
1269−listsToForest :: Eq a => [[a]] -> Forest a
1270−listsToForest l = fmap (\(a, l') -> Node a $ listsToForest $ toList l') $ groupByHead $ catMaybes $ fmap nonEmpty l
1271−#endif
1272−
1273−{-# INLINE propagateSubscriberHold #-}
1274−propagateSubscriberHold :: forall x p. (HasSpiderTimeline x, Patch p) => Hold x p -> p -> EventM x ()
1275−propagateSubscriberHold h a = do
1276− {-# SCC "trace" #-} traceMWhen (Proxy :: Proxy x) debugPropagate $ liftIO $ do
1277− invalidators <- liftIO $ readIORef $ holdInvalidators h
1278− return $ "SubscriberHold" <> showNodeId h <> ": " ++ show (length invalidators)
1279− v <- {-# SCC "read" #-} liftIO $ readIORef $ holdValue h
1280− case {-# SCC "apply" #-} apply a v of
1281− Nothing -> return ()
1282− Just v' -> do
1283− {-# SCC "trace2" #-} withIncreasedDepth $ tracePropagate (Proxy :: Proxy x) $ "propagateSubscriberHold: assigning Hold" <> showNodeId h
1284− vRef <- {-# SCC "vRef" #-} liftIO $ evaluate $ holdValue h
1285− iRef <- {-# SCC "iRef" #-} liftIO $ evaluate $ holdInvalidators h
1286− defer $ {-# SCC "assignment" #-} SomeAssignment vRef iRef v'
1287−
1288−data SomeResetCoincidence x = forall a. SomeResetCoincidence !(EventSubscription x) !(Maybe (CoincidenceSubscribed x a)) -- The CoincidenceSubscriber will be present only if heights need to be reset
1289−
1290−runBehaviorM :: BehaviorM x a -> Maybe (Weak (Invalidator x), IORef [SomeBehaviorSubscribed x]) -> IORef [SomeHoldInit x] -> IO a
1291−runBehaviorM a mwi holdInits = runReaderT (unBehaviorM a) (mwi, holdInits)
1292−
1293−askInvalidator :: BehaviorM x (Maybe (Weak (Invalidator x)))
1294−askInvalidator = do
1295− (!m, _) <- BehaviorM ask
1296− case m of
1297− Nothing -> return Nothing
1298− Just (!wi, _) -> return $ Just wi
1299−
1300−askParentsRef :: BehaviorM x (Maybe (IORef [SomeBehaviorSubscribed x]))
1301−askParentsRef = do
1302− (!m, _) <- BehaviorM ask
1303− case m of
1304− Nothing -> return Nothing
1305− Just (_, !p) -> return $ Just p
1306−
1307−askBehaviorHoldInits :: BehaviorM x (IORef [SomeHoldInit x])
1308−askBehaviorHoldInits = do
1309− (_, !his) <- BehaviorM ask
1310− return his
1311−
1312−{-# INLINE getDynHold #-}
1313−getDynHold :: (Defer (SomeHoldInit x) m, Patch p) => Dyn x p -> m (Hold x p)
1314−getDynHold d = do
1315− mh <- liftIO $ readIORef $ unDyn d
1316− case mh of
1317− Right h -> return h
1318− Left (readV0, v') -> do
1319− holdInits <- getDeferralQueue
1320− v0 <- liftIO $ runBehaviorM readV0 Nothing holdInits
1321− h <- hold v0 v'
1322− liftIO $ writeIORef (unDyn d) $ Right h
1323− return h
1324−
1325−-- Always refers to 0
1326−{-# NOINLINE zeroRef #-}
1327−zeroRef :: IORef Height
1328−zeroRef = unsafePerformIO $ newIORef zeroHeight
1329−
1330−type CanSubscribe x m =
1331− ( HasSpiderTimeline x
1332− , HasCurrentHeight x m
1333− , Defer (SomeHoldInit x) m, Defer (SomeMergeInit x) m -- The things we need to lazily initialize state
1334− , Defer SomeClear m -- Wiping out event firings
1335− , Defer (SomeAssignment x) m -- Updating state
1336− , Defer (SomeResetCoincidence x) m
1337− , m ~ EventM x
1338− )
1339−
1340−getRootSubscribed :: GCompare k => k a -> Root x k -> Subscriber x a -> IO (WeakBagTicket, RootSubscribed x a, Maybe a)
1341−getRootSubscribed k r sub = do
1342− mSubscribed <- readIORef $ rootSubscribed r
1343− let getOcc = fmap (coerce . DMap.lookup k) $ readIORef $ rootOccurrence r
1344− case DMap.lookup k mSubscribed of
1345− Just subscribed -> {-# SCC "hitRoot" #-} do
1346− sln <- subscribeRootSubscribed subscribed sub
1347− occ <- getOcc
1348− return (sln, subscribed, occ)
1349− Nothing -> {-# SCC "missRoot" #-} do
1350− weakSelf <- newIORef $ error "getRootSubscribed: weakSelfRef not initialized"
1351− let !cached = rootSubscribed r
1352− uninitRef <- newIORef $ error "getRootsubscribed: uninitRef not initialized"
1353− (subs, sln) <- WeakBag.singleton sub weakSelf cleanupRootSubscribed
1354− when debugPropagate $ putStrLn $ "getRootSubscribed: calling rootInit"
1355− uninit <- rootInit r k $ RootTrigger (subs, rootOccurrence r, k)
1356− writeIORef uninitRef $! uninit
1357− let subscribed = RootSubscribed
1358− { rootSubscribedKey = k
1359− , rootSubscribedCachedSubscribed = cached
1360− , rootSubscribedOccurrence = getOcc
1361− , rootSubscribedSubscribers = subs
1362− , rootSubscribedUninit = uninit
1363− , rootSubscribedWeakSelf = weakSelf
1364−#ifdef DEBUG_NODEIDS
1365− , rootSubscribedNodeId = unsafeNodeId (k, r, subs)
1366−#endif
1367− }
1368− writeIORef weakSelf =<< evaluate =<< mkWeakPtrWithDebug subscribed "RootSubscribed"
1369− 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
1370− occ <- getOcc
1371− return (sln, subscribed, occ)
1372−
1373−#ifdef USE_TEMPLATE_HASKELL
1374−{-# ANN cleanupRootSubscribed "HLint: ignore Redundant bracket" #-}
1375−#endif
1376−cleanupRootSubscribed :: RootSubscribed x a -> IO ()
1377−cleanupRootSubscribed self@RootSubscribed { rootSubscribedKey = k, rootSubscribedCachedSubscribed = cached } = do
1378− rootSubscribedUninit self
1379− modifyIORef' cached $ DMap.delete k
1380−
1381−{-# INLINE subscribeRootSubscribed #-}
1382−subscribeRootSubscribed :: RootSubscribed x a -> Subscriber x a -> IO WeakBagTicket
1383−subscribeRootSubscribed subscribed sub = WeakBag.insert sub (rootSubscribedSubscribers subscribed) (rootSubscribedWeakSelf subscribed) cleanupRootSubscribed
1384−
1385−{-# INLINABLE getFanSubscribed #-}
1386−getFanSubscribed :: (Defer (SomeAssignment x) m, Defer (SomeHoldInit x) m, Defer (SomeMergeInit x) m, Defer SomeClear m, HasCurrentHeight x m, Defer (SomeResetCoincidence x) m, HasSpiderTimeline x, m ~ EventM x, GCompare k) => k a -> Fan x k -> Subscriber x a -> m (WeakBagTicket, FanSubscribed x k, Maybe a)
1387−getFanSubscribed k f sub = do
1388− mSubscribed <- liftIO $ readIORef $ fanSubscribed f
1389− case mSubscribed of
1390− Just subscribed -> {-# SCC "hitFan" #-} liftIO $ do
1391− sln <- subscribeFanSubscribed k subscribed sub
1392− occ <- readIORef $ fanSubscribedOccurrence subscribed
1393− return (sln, subscribed, coerce $ DMap.lookup k =<< occ)
1394− Nothing -> {-# SCC "missFan" #-} do
1395− subscribedRef <- liftIO $ newIORef $ error "getFanSubscribed: subscribedRef not yet initialized"
1396− subscribedUnsafe <- liftIO $ unsafeInterleaveIO $ readIORef subscribedRef
1397− s <- liftIO $ newSubscriberFan subscribedUnsafe
1398− (subscription, parentOcc) <- subscribeAndRead (fanParent f) s
1399− weakSelf <- liftIO $ newIORef $ error "getFanSubscribed: weakSelf not yet initialized"
1400− (subsForK, slnForSub) <- liftIO $ WeakBag.singleton sub weakSelf cleanupFanSubscribed
1401− subscribersRef <- liftIO $ newIORef $ error "getFanSubscribed: subscribersRef not yet initialized"
1402− occRef <- liftIO $ newIORef parentOcc
1403− when (isJust parentOcc) $ scheduleClear occRef
1404− let subscribed = FanSubscribed
1405− { fanSubscribedCachedSubscribed = fanSubscribed f
1406− , fanSubscribedOccurrence = occRef
1407− , fanSubscribedParent = subscription
1408− , fanSubscribedSubscribers = subscribersRef
1409−#ifdef DEBUG_NODEIDS
1410− , fanSubscribedNodeId = unsafeNodeId f
1411−#endif
1412− }
1413− let !self = (k, subscribed)
1414− liftIO $ writeIORef subscribersRef $! DMap.singleton k $ FanSubscribedChildren subsForK self weakSelf
1415− liftIO $ writeIORef weakSelf =<< evaluate =<< mkWeakPtrWithDebug self "FanSubscribed"
1416− liftIO $ writeIORef subscribedRef $! subscribed
1417− liftIO $ writeIORef (fanSubscribed f) $ Just subscribed
1418− return (slnForSub, subscribed, coerce $ DMap.lookup k =<< parentOcc)
1419−
1420−cleanupFanSubscribed :: GCompare k => (k a, FanSubscribed x k) -> IO ()
1421−cleanupFanSubscribed (k, subscribed) = do
1422− subscribers <- readIORef $ fanSubscribedSubscribers subscribed
1423− let reducedSubscribers = DMap.delete k subscribers
1424− if DMap.null reducedSubscribers
1425− then do
1426− unsubscribe $ fanSubscribedParent subscribed
1427− -- Not necessary in this case, because this whole FanSubscribed is dead: writeIORef (fanSubscribedSubscribers subscribed) reducedSubscribers
1428− writeIORef (fanSubscribedCachedSubscribed subscribed) Nothing
1429− else writeIORef (fanSubscribedSubscribers subscribed) $! reducedSubscribers
1430−
1431−{-# INLINE subscribeFanSubscribed #-}
1432−subscribeFanSubscribed :: GCompare k => k a -> FanSubscribed x k -> Subscriber x a -> IO WeakBagTicket
1433−subscribeFanSubscribed k subscribed sub = do
1434− subscribers <- readIORef $ fanSubscribedSubscribers subscribed
1435− case DMap.lookup k subscribers of
1436− Nothing -> {-# SCC "missSubscribeFanSubscribed" #-} do
1437− let !self = (k, subscribed)
1438− weakSelf <- newIORef =<< mkWeakPtrWithDebug self "FanSubscribed"
1439− (list, sln) <- WeakBag.singleton sub weakSelf cleanupFanSubscribed
1440− 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
1441− return sln
1442− Just (FanSubscribedChildren list _ weakSelf) -> {-# SCC "hitSubscribeFanSubscribed" #-} WeakBag.insert sub list weakSelf cleanupFanSubscribed
1443−
1444−{-# INLINABLE getSwitchSubscribed #-}
1445−getSwitchSubscribed :: (Defer (SomeHoldInit x) m, Defer (SomeAssignment x) m, Defer (SomeMergeInit x) m, Defer SomeClear m, Defer (SomeResetCoincidence x) m, HasCurrentHeight x m, HasSpiderTimeline x, m ~ EventM x) => Switch x a -> Subscriber x a -> m (WeakBagTicket, SwitchSubscribed x a, Maybe a)
1446−getSwitchSubscribed s sub = do
1447− mSubscribed <- liftIO $ readIORef $ switchSubscribed s
1448− case mSubscribed of
1449− Just subscribed -> {-# SCC "hitSwitch" #-} liftIO $ do
1450− sln <- subscribeSwitchSubscribed subscribed sub
1451− occ <- readIORef $ switchSubscribedOccurrence subscribed
1452− return (sln, subscribed, occ)
1453− Nothing -> {-# SCC "missSwitch" #-} do
1454− subscribedRef <- liftIO $ newIORef $ error "getSwitchSubscribed: subscribed has not yet been created"
1455− subscribedUnsafe <- liftIO $ unsafeInterleaveIO $ readIORef subscribedRef
1456− i <- liftIO $ newInvalidatorSwitch subscribedUnsafe
1457− mySub <- liftIO $ newSubscriberSwitch subscribedUnsafe
1458− wi <- liftIO $ mkWeakPtrWithDebug i "InvalidatorSwitch"
1459− wiRef <- liftIO $ newIORef wi
1460− parentsRef <- liftIO $ newIORef [] --TODO: This should be unnecessary, because it will always be filled with just the single parent behavior
1461− holdInits <- getDeferralQueue
1462− e <- liftIO $ runBehaviorM (readBehaviorTracked (switchParent s)) (Just (wi, parentsRef)) holdInits
1463− (subscription@(EventSubscription _ subd), parentOcc) <- subscribeAndRead e mySub
1464− heightRef <- liftIO $ newIORef =<< getEventSubscribedHeight subd
1465− subscriptionRef <- liftIO $ newIORef subscription
1466− occRef <- liftIO $ newIORef parentOcc
1467− when (isJust parentOcc) $ scheduleClear occRef
1468− weakSelf <- liftIO $ newIORef $ error "getSwitchSubscribed: weakSelf not yet initialized"
1469− (subs, slnForSub) <- liftIO $ WeakBag.singleton sub weakSelf cleanupSwitchSubscribed
1470− let !subscribed = SwitchSubscribed
1471− { switchSubscribedCachedSubscribed = switchSubscribed s
1472− , switchSubscribedOccurrence = occRef
1473− , switchSubscribedHeight = heightRef
1474− , switchSubscribedSubscribers = subs
1475− , switchSubscribedOwnInvalidator = i
1476− , switchSubscribedOwnWeakInvalidator = wiRef
1477− , switchSubscribedBehaviorParents = parentsRef
1478− , switchSubscribedParent = switchParent s
1479− , switchSubscribedCurrentParent = subscriptionRef
1480− , switchSubscribedWeakSelf = weakSelf
1481−#ifdef DEBUG_NODEIDS
1482− , switchSubscribedNodeId = unsafeNodeId s
1483−#endif
1484− }
1485− liftIO $ writeIORef weakSelf =<< evaluate =<< mkWeakPtrWithDebug subscribed "switchSubscribedWeakSelf"
1486− liftIO $ writeIORef subscribedRef $! subscribed
1487− liftIO $ writeIORef (switchSubscribed s) $ Just subscribed
1488− return (slnForSub, subscribed, parentOcc)
1489−
1490−cleanupSwitchSubscribed :: SwitchSubscribed x a -> IO ()
1491−cleanupSwitchSubscribed subscribed = do
1492− unsubscribe =<< readIORef (switchSubscribedCurrentParent subscribed)
1493− finalize =<< readIORef (switchSubscribedOwnWeakInvalidator subscribed) -- We don't need to get invalidated if we're dead
1494− writeIORef (switchSubscribedCachedSubscribed subscribed) Nothing
1495−
1496−{-# INLINE subscribeSwitchSubscribed #-}
1497−subscribeSwitchSubscribed :: SwitchSubscribed x a -> Subscriber x a -> IO WeakBagTicket
1498−subscribeSwitchSubscribed subscribed sub = WeakBag.insert sub (switchSubscribedSubscribers subscribed) (switchSubscribedWeakSelf subscribed) cleanupSwitchSubscribed
1499−
1500−{-# INLINABLE getCoincidenceSubscribed #-}
1501−getCoincidenceSubscribed :: forall x a m. (Defer (SomeAssignment x) m, Defer (SomeHoldInit x) m, Defer (SomeMergeInit x) m, Defer SomeClear m, HasCurrentHeight x m, Defer (SomeResetCoincidence x) m, HasSpiderTimeline x, m ~ EventM x) => Coincidence x a -> Subscriber x a -> m (WeakBagTicket, CoincidenceSubscribed x a, Maybe a)
1502−getCoincidenceSubscribed c sub = do
1503− mSubscribed <- liftIO $ readIORef $ coincidenceSubscribed c
1504− case mSubscribed of
1505− Just subscribed -> {-# SCC "hitCoincidence" #-} liftIO $ do
1506− sln <- subscribeCoincidenceSubscribed subscribed sub
1507− occ <- readIORef $ coincidenceSubscribedOccurrence subscribed
1508− return (sln, subscribed, occ)
1509− Nothing -> {-# SCC "missCoincidence" #-} do
1510− subscribedRef <- liftIO $ newIORef $ error "getCoincidenceSubscribed: subscribed has not yet been created"
1511− subscribedUnsafe <- liftIO $ unsafeInterleaveIO $ readIORef subscribedRef
1512− subOuter <- liftIO $ newSubscriberCoincidenceOuter subscribedUnsafe
1513− (outerSubscription@(EventSubscription _ outerSubd), outerOcc) <- subscribeAndRead (coincidenceParent c) subOuter
1514− outerHeight <- liftIO $ getEventSubscribedHeight outerSubd
1515− (occ, height, mInnerSubd) <- case outerOcc of
1516− Nothing -> return (Nothing, outerHeight, Nothing)
1517− Just o -> do
1518− (occ, height, innerSubd) <- subscribeCoincidenceInner o outerHeight subscribedUnsafe
1519− return (occ, height, Just innerSubd)
1520− occRef <- liftIO $ newIORef occ
1521− when (isJust occ) $ scheduleClear occRef
1522− heightRef <- liftIO $ newIORef height
1523− innerSubdRef <- liftIO $ newIORef mInnerSubd
1524− scheduleClear innerSubdRef
1525− weakSelf <- liftIO $ newIORef $ error "getCoincidenceSubscribed: weakSelf not yet implemented"
1526− (subs, slnForSub) <- liftIO $ WeakBag.singleton sub weakSelf cleanupCoincidenceSubscribed
1527− let subscribed = CoincidenceSubscribed
1528− { coincidenceSubscribedCachedSubscribed = coincidenceSubscribed c
1529− , coincidenceSubscribedOccurrence = occRef
1530− , coincidenceSubscribedHeight = heightRef
1531− , coincidenceSubscribedSubscribers = subs
1532− , coincidenceSubscribedOuter = subOuter
1533− , coincidenceSubscribedOuterParent = outerSubscription
1534− , coincidenceSubscribedInnerParent = innerSubdRef
1535− , coincidenceSubscribedWeakSelf = weakSelf
1536−#ifdef DEBUG_NODEIDS
1537− , coincidenceSubscribedNodeId = unsafeNodeId c
1538−#endif
1539− }
1540− liftIO $ writeIORef weakSelf =<< evaluate =<< mkWeakPtrWithDebug subscribed "CoincidenceSubscribed"
1541− liftIO $ writeIORef subscribedRef $! subscribed
1542− liftIO $ writeIORef (coincidenceSubscribed c) $ Just subscribed
1543− return (slnForSub, subscribed, occ)
1544−
1545−cleanupCoincidenceSubscribed :: CoincidenceSubscribed x a -> IO ()
1546−cleanupCoincidenceSubscribed subscribed = do
1547− unsubscribe $ coincidenceSubscribedOuterParent subscribed
1548− writeIORef (coincidenceSubscribedCachedSubscribed subscribed) Nothing
1549−
1550−{-# INLINE subscribeCoincidenceSubscribed #-}
1551−subscribeCoincidenceSubscribed :: CoincidenceSubscribed x a -> Subscriber x a -> IO WeakBagTicket
1552−subscribeCoincidenceSubscribed subscribed sub = WeakBag.insert sub (coincidenceSubscribedSubscribers subscribed) (coincidenceSubscribedWeakSelf subscribed) cleanupCoincidenceSubscribed
1553−
1554−{-# INLINE merge #-}
1555−merge :: forall k x. (HasSpiderTimeline x, GCompare k) => Dynamic x (PatchDMap k (Event x)) -> Event x (DMap k Identity)
1556−merge d = cacheEvent (mergeCheap d)
1557−
1558−{-# INLINE mergeWithMove #-}
1559−mergeWithMove :: forall k x. (HasSpiderTimeline x, GCompare k) => Dynamic x (PatchDMapWithMove k (Event x)) -> Event x (DMap k Identity)
1560−mergeWithMove d = cacheEvent (mergeCheapWithMove d)
1561−
1562−{-# INLINE [1] mergeCheap #-}
1563−mergeCheap :: forall k x. (HasSpiderTimeline x, GCompare k) => Dynamic x (PatchDMap k (Event x)) -> Event x (DMap k Identity)
1564−mergeCheap = mergeCheap' getInitialSubscribers updateMe destroy DMap.size
1565− where
1566− updateMe :: MergeUpdateFunc k x (PatchDMap k (Event x)) (MergeSubscribedParent x)
1567− updateMe subscriber heightBagRef oldParents (PatchDMap p) = do
1568− let f (subscriptionsToKill, ps) (k :=> ComposeMaybe me) = do
1569− (mOldSubd, newPs) <- case me of
1570− Nothing -> return $ DMap.updateLookupWithKey (\_ _ -> Nothing) k ps
1571− Just e -> do
1572− let s = subscriber $ return k
1573− subscription@(EventSubscription _ subd) <- subscribe e s
1574− newParentHeight <- liftIO $ getEventSubscribedHeight subd
1575− let newParent = MergeSubscribedParent subscription
1576− liftIO $ modifyIORef' heightBagRef $ heightBagAdd newParentHeight
1577− return $ DMap.insertLookupWithKey' (\_ new _ -> new) k newParent ps
1578− forM_ mOldSubd $ \oldSubd -> do
1579− oldHeight <- liftIO $ getEventSubscribedHeight $ _eventSubscription_subscribed $ unMergeSubscribedParent oldSubd
1580− liftIO $ modifyIORef heightBagRef $ heightBagRemove oldHeight
1581− return (maybeToList (unMergeSubscribedParent <$> mOldSubd) ++ subscriptionsToKill, newPs)
1582− foldM f ([], oldParents) $ DMap.toList p
1583− getInitialSubscribers :: MergeInitFunc k x (MergeSubscribedParent x)
1584− getInitialSubscribers initialParents subscriber = do
1585− subscribers <- forM (DMap.toList initialParents) $ \(k :=> e) -> do
1586− let s = subscriber $ return k
1587− (subscription@(EventSubscription _ parentSubd), parentOcc) <- subscribeAndRead e s
1588− height <- liftIO $ getEventSubscribedHeight parentSubd
1589− return (fmap (\x -> k :=> Identity x) parentOcc, height, k :=> MergeSubscribedParent subscription)
1590− return ( DMap.fromDistinctAscList $ mapMaybe (\(x, _, _) -> x) subscribers
1591− , fmap (\(_, h, _) -> h) subscribers --TODO: Assert that there's no invalidHeight in here
1592− , DMap.fromDistinctAscList $ map (\(_, _, x) -> x) subscribers
1593− )
1594− destroy :: MergeDestroyFunc k (MergeSubscribedParent x)
1595− destroy s = forM_ (DMap.toList s) $ \(_ :=> MergeSubscribedParent sub) -> unsubscribe sub
1596−
1597−{-# INLINE [1] mergeCheapWithMove #-}
1598−mergeCheapWithMove :: forall k x. (HasSpiderTimeline x, GCompare k) => Dynamic x (PatchDMapWithMove k (Event x)) -> Event x (DMap k Identity)
1599−mergeCheapWithMove = mergeCheap' getInitialSubscribers updateMe destroy DMap.size
1600− where
1601− updateMe :: MergeUpdateFunc k x (PatchDMapWithMove k (Event x)) (MergeSubscribedParentWithMove x k)
1602− updateMe subscriber heightBagRef oldParents pWrapped = do
1603− let p = unPatchDMapWithMove pWrapped
1604− let f (subscriptionsToKill, ps) (k :=> edit) = do
1605− let deleteHere = return $ DMap.updateLookupWithKey (\_ _ -> Nothing) k ps
1606− insertHere e = do
1607− keyRef <- liftIO $ newIORef k
1608− let s = subscriber $ liftIO $ readIORef keyRef
1609− subscription@(EventSubscription _ subd) <- subscribe e s
1610− liftIO $ do
1611− newParentHeight <- getEventSubscribedHeight subd
1612− let newParent = MergeSubscribedParentWithMove subscription keyRef
1613− modifyIORef' heightBagRef $ heightBagAdd newParentHeight
1614− return $ DMap.insertLookupWithKey' (\_ new _ -> new) k newParent ps
1615− (mOldSubd, newPs) <- case edit of
1616− DMapEdit_Delete moved -> do
1617− (toDelete, newPs) <- deleteHere
1618− return (if moved then Nothing else toDelete, newPs)
1619− DMapEdit_Insert moved e -> do
1620− (toDelete, newPs) <- insertHere e
1621− return (if moved then Nothing else toDelete, newPs)
1622− DMapEdit_Move moved sourceKey -> do
1623− (toDelete, newPs) <- case DMap.lookup sourceKey ps of
1624− Nothing -> deleteHere
1625− Just s@(MergeSubscribedParentWithMove _ keyRef) -> do
1626− liftIO $ writeIORef keyRef k
1627− return $ DMap.insertLookupWithKey' (\_ new _ -> new) k s ps
1628− return (if moved then Nothing else toDelete, newPs)
1629− forM_ mOldSubd $ \oldSubd -> do
1630− oldHeight <- liftIO $ getEventSubscribedHeight $ _eventSubscription_subscribed $ _mergeSubscribedParentWithMove_subscription oldSubd
1631− liftIO $ modifyIORef heightBagRef $ heightBagRemove oldHeight
1632− return (maybeToList (_mergeSubscribedParentWithMove_subscription <$> mOldSubd) ++ subscriptionsToKill, newPs)
1633− foldM f ([], oldParents) $ DMap.toList p
1634− getInitialSubscribers :: MergeInitFunc k x (MergeSubscribedParentWithMove x k)
1635− getInitialSubscribers initialParents subscriber = do
1636− subscribers <- forM (DMap.toList initialParents) $ \(k :=> e) -> do
1637− keyRef <- liftIO $ newIORef k
1638− let s = subscriber $ liftIO $ readIORef keyRef
1639− (subscription@(EventSubscription _ parentSubd), parentOcc) <- subscribeAndRead e s
1640− height <- liftIO $ getEventSubscribedHeight parentSubd
1641− return (fmap (\x -> k :=> Identity x) parentOcc, height, k :=> MergeSubscribedParentWithMove subscription keyRef)
1642− return ( DMap.fromDistinctAscList $ mapMaybe (\(x, _, _) -> x) subscribers
1643− , fmap (\(_, h, _) -> h) subscribers --TODO: Assert that there's no invalidHeight in here
1644− , DMap.fromDistinctAscList $ map (\(_, _, x) -> x) subscribers
1645− )
1646− destroy :: MergeDestroyFunc k (MergeSubscribedParentWithMove x k)
1647− destroy s = forM_ (DMap.toList s) $ \(_ :=> MergeSubscribedParentWithMove sub _) -> unsubscribe sub
1648−
1649−type MergeUpdateFunc k x p s
1650− = (forall a. EventM x (k a) -> Subscriber x a)
1651− -> IORef HeightBag
1652− -> DMap k s
1653− -> p
1654− -> EventM x ([EventSubscription x], DMap k s)
1655−
1656−type MergeInitFunc k x s
1657− = DMap k (Event x)
1658− -> (forall a. EventM x (k a) -> Subscriber x a)
1659− -> EventM x (DMap k Identity, [Height], DMap k s)
1660−
1661−type MergeDestroyFunc k s
1662− = DMap k s
1663− -> IO ()
1664−
1665−{-# INLINE mergeCheap' #-}
1666−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 -> (DMap k s -> Int) -> Dynamic x p -> Event x (DMap k Identity)
1667−mergeCheap' getInitialSubscribers updateFunc destroy numParents d = Event $ \sub -> do
1668− initialParents <- readBehaviorUntracked $ dynamicCurrent d
1669− accumRef <- liftIO $ newIORef $ error "merge: accumRef not yet initialized"
1670− heightRef <- liftIO $ newIORef $ error "merge: heightRef not yet initialized"
1671− heightBagRef <- liftIO $ newIORef $ error "merge: heightBagRef not yet initialized"
1672− parentsRef :: IORef (DMap k s) <- liftIO $ newIORef $ error "merge: parentsRef not yet initialized"
1673− let scheduleSelf height = scheduleMerge' height heightRef $ do
1674− m <- liftIO $ readIORef accumRef
1675− liftIO $ writeIORef accumRef $! DMap.empty
1676− --TODO: Assert that m is not empty
1677− subscriberPropagate sub m
1678− invalidateMyHeight = do
1679− oldHeight <- readIORef heightRef
1680− 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
1681− writeIORef heightRef $! invalidHeight
1682− subscriberInvalidateHeight sub oldHeight
1683− revalidateMyHeight = do
1684− currentHeight <- readIORef heightRef
1685− when (currentHeight == invalidHeight) $ do -- revalidateMergeHeight may be called multiple times; perhaps the's a way to finesse it to avoid this check
1686− heights <- readIORef heightBagRef
1687− parents <- readIORef parentsRef
1688− -- When the number of heights in the bag reaches the number of parents, we should have a valid height
1689− case heightBagSize heights `compare` numParents parents of
1690− LT -> return ()
1691− EQ -> do
1692− let height = succHeight $ heightBagMax heights
1693− when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: height: " <> show height
1694− writeIORef heightRef $! height
1695− subscriberRecalculateHeight sub height
1696− GT -> error $ "revalidateMergeHeight: more heights than parents for Merge"
1697− subscriber :: forall a. EventM x (k a) -> Subscriber x a
1698− subscriber getKey = Subscriber
1699− { subscriberPropagate = \a -> do
1700− oldM <- liftIO $ readIORef accumRef
1701− k <- getKey
1702− let newM = DMap.insertWith (error $ "Same key fired multiple times for Merge") k (Identity a) oldM
1703− tracePropagate (Proxy :: Proxy x) $ " DMap.size oldM = " <> show (DMap.size oldM) <> "; DMap.size newM = " <> show (DMap.size newM)
1704− liftIO $ writeIORef accumRef $! newM
1705− when (DMap.null oldM) $ do -- Only schedule the firing once
1706− height <- liftIO $ readIORef heightRef
1707− --TODO: assertions about height
1708− currentHeight <- getCurrentHeight
1709− when (height <= currentHeight) $ do
1710− if height /= invalidHeight
1711− then do
1712− myStack <- liftIO $ whoCreatedIORef undefined --TODO
1713− error $ "Height (" ++ show height ++ ") is not greater than current height (" ++ show currentHeight ++ ")\n" ++ unlines (reverse myStack)
1714− else liftIO $ do
1715−#ifdef DEBUG_CYCLES
1716− nodesInvolvedInCycle <- walkInvalidHeightParents $ eventSubscribedMerge subscribed
1717− stacks <- forM nodesInvolvedInCycle $ \(Some.This es) -> whoCreatedEventSubscribed es
1718− let cycleInfo = ":\n" <> drawForest (listsToForest stacks)
1719−#else
1720− let cycleInfo = ""
1721−#endif
1722− error $ "Causality loop found" <> cycleInfo
1723− scheduleSelf height
1724− , subscriberInvalidateHeight = \old -> do --TODO: When removing a parent doesn't actually change the height, maybe we can avoid invalidating
1725− modifyIORef' heightBagRef $ heightBagRemove old
1726− invalidateMyHeight
1727− , subscriberRecalculateHeight = \new -> do
1728− modifyIORef' heightBagRef $ heightBagAdd new
1729− revalidateMyHeight
1730− }
1731− let updateMe x = do
1732− oldParents <- liftIO $ readIORef parentsRef
1733− (subscriptionsToKill, newParents) <- updateFunc subscriber heightBagRef oldParents x
1734− liftIO $ writeIORef parentsRef $! newParents
1735− return subscriptionsToKill
1736− (dm, heights, initialParentState) <- getInitialSubscribers initialParents subscriber
1737− let myHeightBag = heightBagFromList $ filter (/= invalidHeight) heights
1738− myHeight = if invalidHeight `elem` heights
1739− then invalidHeight
1740− else succHeight $ heightBagMax myHeightBag
1741− currentHeight <- getCurrentHeight
1742− let (occ, accum) = if currentHeight >= myHeight -- If we should have fired by now
1743− then (if DMap.null dm then Nothing else Just dm, DMap.empty)
1744− else (Nothing, dm)
1745− unless (DMap.null accum) $ do
1746− scheduleSelf myHeight
1747− occRef <- liftIO $ newIORef occ
1748− when (isJust occ) $ scheduleClear occRef
1749− liftIO $ writeIORef accumRef $! accum
1750− liftIO $ writeIORef heightRef $! myHeight
1751− liftIO $ writeIORef heightBagRef $! myHeightBag
1752− changeSubdRef <- liftIO $ newIORef $ error "getMergeSubscribed: changeSubdRef not yet initialized"
1753− liftIO $ writeIORef parentsRef $! initialParentState
1754− defer $ SomeMergeInit $ do
1755− let s = Subscriber
1756− { subscriberPropagate = \a -> {-# SCC "traverseMergeChange" #-} do
1757− tracePropagate (Proxy :: Proxy x) $ "SubscriberMerge/Change"
1758− defer $ SomeMergeUpdate (updateMe a) invalidateMyHeight revalidateMyHeight
1759− , subscriberInvalidateHeight = \_ -> return ()
1760− , subscriberRecalculateHeight = \_ -> return ()
1761− }
1762− (changeSubscription, change) <- subscribeAndRead (dynamicUpdated d) s
1763− forM_ change $ \c -> defer $ SomeMergeUpdate (updateMe c) invalidateMyHeight revalidateMyHeight
1764− -- We explicitly hold on to the unsubscribe function from subscribing to the update event.
1765− -- If we don't do this, there are certain cases where mergeCheap will fail to properly retain
1766− -- its subscription.
1767− liftIO $ writeIORef changeSubdRef (s, changeSubscription)
1768− let unsubscribeAll = destroy =<< readIORef parentsRef
1769− return ( EventSubscription unsubscribeAll $ EventSubscribed heightRef $ toAny (parentsRef, changeSubdRef)
1770− , occ
1771− )
1772−
1773−newtype EventSelector x k = EventSelector { select :: forall a. k a -> Event x a }
1774−
1775−fan :: (HasSpiderTimeline x, GCompare k) => Event x (DMap k Identity) -> EventSelector x k
1776−fan e =
1777− let f = Fan
1778− { fanParent = e
1779− , fanSubscribed = unsafeNewIORef e Nothing
1780− }
1781− in EventSelector $ \k -> eventFan k f
1782−
1783−runHoldInits :: HasSpiderTimeline x => IORef [SomeHoldInit x] -> IORef [SomeMergeInit x] -> EventM x ()
1784−runHoldInits holdInitRef mergeInitRef = do
1785− holdInits <- liftIO $ readIORef holdInitRef
1786− mergeInits <- liftIO $ readIORef mergeInitRef
1787− unless (null holdInits && null mergeInits) $ do
1788− liftIO $ writeIORef holdInitRef []
1789− liftIO $ writeIORef mergeInitRef []
1790− mapM_ initHold holdInits
1791− mapM_ unSomeMergeInit mergeInits
1792− runHoldInits holdInitRef mergeInitRef
1793−
1794−initHold :: HasSpiderTimeline x => SomeHoldInit x -> EventM x ()
1795−initHold (SomeHoldInit h) = void $ getHoldEventSubscription h
1796−
1797−newEventEnv :: IO (EventEnv x)
1798−newEventEnv = do
1799− toAssignRef <- newIORef [] -- This should only actually get used when events are firing
1800− holdInitRef <- newIORef []
1801− mergeUpdateRef <- newIORef []
1802− mergeInitRef <- newIORef []
1803− heightRef <- newIORef zeroHeight
1804− toClearRef <- newIORef []
1805− toClearRootRef <- newIORef []
1806− coincidenceInfosRef <- newIORef []
1807− delayedRef <- newIORef IntMap.empty
1808− return $ EventEnv toAssignRef holdInitRef mergeUpdateRef mergeInitRef toClearRef toClearRootRef heightRef coincidenceInfosRef delayedRef
1809−
1810−clearEventEnv :: EventEnv x -> IO ()
1811−clearEventEnv (EventEnv toAssignRef holdInitRef mergeUpdateRef mergeInitRef toClearRef toClearRootRef heightRef coincidenceInfosRef delayedRef) = do
1812− writeIORef toAssignRef []
1813− writeIORef holdInitRef []
1814− writeIORef mergeUpdateRef []
1815− writeIORef mergeInitRef []
1816− writeIORef heightRef zeroHeight
1817− writeIORef toClearRef []
1818− writeIORef toClearRootRef []
1819− writeIORef coincidenceInfosRef []
1820− writeIORef delayedRef IntMap.empty
1821−
1822−-- | Run an event action outside of a frame
1823−runFrame :: forall x a. HasSpiderTimeline x => EventM x a -> SpiderHost x a --TODO: This function also needs to hold the mutex
1824−runFrame a = SpiderHost $ ask >>= \_ -> lift $ do
1825− let env = _spiderTimeline_eventEnv (spiderTimeline :: SpiderTimelineEnv x)
1826− let go = do
1827− result <- a
1828− runHoldInits (eventEnvHoldInits 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
1829− return result
1830− result <- runEventM go
1831− toClear <- readIORef $ eventEnvClears env
1832− forM_ toClear $ \(SomeClear ref) -> {-# SCC "clear" #-} writeIORef ref Nothing
1833− toClearRoot <- readIORef $ eventEnvRootClears env
1834− forM_ toClearRoot $ \(SomeRootClear ref) -> {-# SCC "rootClear" #-} writeIORef ref $! DMap.empty
1835− toAssign <- readIORef $ eventEnvAssignments env
1836− toReconnectRef <- newIORef []
1837− coincidenceInfos <- readIORef $ eventEnvResetCoincidences env
1838− forM_ toAssign $ \(SomeAssignment vRef iRef v) -> {-# SCC "assignment" #-} do
1839− writeIORef vRef v
1840− when debugInvalidate $ putStrLn $ "Invalidating Hold"
1841− writeIORef iRef =<< evaluate =<< invalidate toReconnectRef =<< readIORef iRef
1842− mergeUpdates <- readIORef $ eventEnvMergeUpdates env
1843− writeIORef (eventEnvMergeUpdates env) []
1844− when debugPropagate $ putStrLn "Updating merges"
1845− mergeSubscriptionsToKill <- runEventM $ concat <$> mapM _someMergeUpdate_update mergeUpdates
1846− when debugPropagate $ putStrLn "Updating merges done"
1847− toReconnect <- readIORef toReconnectRef
1848− clearEventEnv env
1849− switchSubscriptionsToKill <- forM toReconnect $ \(SomeSwitchSubscribed subscribed) -> {-# SCC "switchSubscribed" #-} do
1850− oldSubscription <- readIORef $ switchSubscribedCurrentParent subscribed
1851− wi <- readIORef $ switchSubscribedOwnWeakInvalidator subscribed
1852− when debugInvalidate $ putStrLn $ "Finalizing invalidator for Switch" <> showNodeId subscribed
1853− finalize wi
1854− i <- evaluate $ switchSubscribedOwnInvalidator subscribed
1855− wi' <- mkWeakPtrWithDebug i "wi'"
1856− writeIORef (switchSubscribedOwnWeakInvalidator subscribed) $! wi'
1857− writeIORef (switchSubscribedBehaviorParents subscribed) []
1858− writeIORef (eventEnvHoldInits env) [] --TODO: Should we reuse this?
1859− e <- runBehaviorM (readBehaviorTracked (switchSubscribedParent subscribed)) (Just (wi', switchSubscribedBehaviorParents subscribed)) $ eventEnvHoldInits env
1860− runEventM $ runHoldInits (eventEnvHoldInits 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
1861− --TODO: Make sure we touch the pieces of the SwitchSubscribed at the appropriate times
1862− sub <- newSubscriberSwitch subscribed
1863− subscription <- runReaderT (unSpiderHost (runFrame ({-# SCC "subscribeSwitch" #-} subscribe e sub))) spiderTimeline --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
1864− {-
1865− stackTrace <- liftIO $ fmap renderStack $ ccsToStrings =<< (getCCSOf $! switchSubscribedParent subscribed)
1866− liftIO $ putStrLn $ (++stackTrace) $ "subd' subscribed to " ++ case e of
1867− EventRoot _ -> "EventRoot"
1868− EventNever -> "EventNever"
1869− _ -> "something else"
1870− -}
1871− writeIORef (switchSubscribedCurrentParent subscribed) $! subscription
1872− return oldSubscription
1873− liftIO $ mapM_ unsubscribe mergeSubscriptionsToKill
1874− liftIO $ mapM_ unsubscribe switchSubscriptionsToKill
1875− forM_ toReconnect $ \(SomeSwitchSubscribed subscribed) -> {-# SCC "switchSubscribed" #-} do
1876− EventSubscription _ subd' <- readIORef $ switchSubscribedCurrentParent subscribed
1877− parentHeight <- getEventSubscribedHeight subd'
1878− myHeight <- readIORef $ switchSubscribedHeight subscribed
1879− when (parentHeight /= myHeight) $ do
1880− writeIORef (switchSubscribedHeight subscribed) $! invalidHeight
1881− WeakBag.traverse (switchSubscribedSubscribers subscribed) $ invalidateSubscriberHeight myHeight
1882− 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
1883− forM_ coincidenceInfos $ \(SomeResetCoincidence subscription mcs) -> do
1884− unsubscribe subscription
1885− mapM_ invalidateCoincidenceHeight mcs
1886− forM_ coincidenceInfos $ \(SomeResetCoincidence _ mcs) -> mapM_ recalculateCoincidenceHeight mcs
1887− mapM_ _someMergeUpdate_recalculateHeight mergeUpdates
1888− forM_ toReconnect $ \(SomeSwitchSubscribed subscribed) -> do
1889− height <- calculateSwitchHeight subscribed
1890− updateSwitchHeight height subscribed
1891− return result
1892−
1893−newtype Height = Height { unHeight :: Int } deriving (Show, Read, Eq, Ord, Bounded)
1894−
1895−{-# INLINE zeroHeight #-}
1896−zeroHeight :: Height
1897−zeroHeight = Height 0
1898−
1899−{-# INLINE invalidHeight #-}
1900−invalidHeight :: Height
1901−invalidHeight = Height (-1000)
1902−
1903−#ifdef DEBUG_CYCLES
1904−-- | An invalid height that is currently being traversed, e.g. by walkInvalidHeightParents
1905−{-# INLINE invalidHeightBeingTraversed #-}
1906−invalidHeightBeingTraversed :: Height
1907−invalidHeightBeingTraversed = Height (-1001)
1908−#endif
1909−
1910−{-# INLINE succHeight #-}
1911−succHeight :: Height -> Height
1912−succHeight h@(Height a) =
1913− if h == invalidHeight
1914− then invalidHeight
1915− else Height $ succ a
1916−
1917−invalidateCoincidenceHeight :: CoincidenceSubscribed x a -> IO ()
1918−invalidateCoincidenceHeight subscribed = do
1919− oldHeight <- readIORef $ coincidenceSubscribedHeight subscribed
1920− when (oldHeight /= invalidHeight) $ do
1921− writeIORef (coincidenceSubscribedHeight subscribed) $! invalidHeight
1922− WeakBag.traverse (coincidenceSubscribedSubscribers subscribed) $ invalidateSubscriberHeight oldHeight
1923−
1924−updateSwitchHeight :: Height -> SwitchSubscribed x a -> IO ()
1925−updateSwitchHeight new subscribed = do
1926− oldHeight <- readIORef $ switchSubscribedHeight subscribed
1927− when (oldHeight == invalidHeight) $ do --TODO: This 'when' should probably be an assertion
1928− when (new /= invalidHeight) $ do --TODO: This 'when' should probably be an assertion
1929− writeIORef (switchSubscribedHeight subscribed) $! new
1930− WeakBag.traverse (switchSubscribedSubscribers subscribed) $ recalculateSubscriberHeight new
1931−
1932−recalculateCoincidenceHeight :: CoincidenceSubscribed x a -> IO ()
1933−recalculateCoincidenceHeight subscribed = do
1934− oldHeight <- readIORef $ coincidenceSubscribedHeight subscribed
1935− when (oldHeight == invalidHeight) $ do --TODO: This 'when' should probably be an assertion
1936− height <- calculateCoincidenceHeight subscribed
1937− when (height /= invalidHeight) $ do
1938− writeIORef (coincidenceSubscribedHeight subscribed) $! height
1939− WeakBag.traverse (coincidenceSubscribedSubscribers subscribed) $ recalculateSubscriberHeight height
1940−
1941−calculateSwitchHeight :: SwitchSubscribed x a -> IO Height
1942−calculateSwitchHeight subscribed = getEventSubscribedHeight . _eventSubscription_subscribed =<< readIORef (switchSubscribedCurrentParent subscribed)
1943−
1944−calculateCoincidenceHeight :: CoincidenceSubscribed x a -> IO Height
1945−calculateCoincidenceHeight subscribed = do
1946− outerHeight <- getEventSubscribedHeight $ _eventSubscription_subscribed $ coincidenceSubscribedOuterParent subscribed
1947− innerHeight <- maybe (return zeroHeight) getEventSubscribedHeight =<< readIORef (coincidenceSubscribedInnerParent subscribed)
1948− return $ if outerHeight == invalidHeight || innerHeight == invalidHeight then invalidHeight else max outerHeight innerHeight
1949−
1950−data SomeSwitchSubscribed x = forall a. SomeSwitchSubscribed {-# NOUNPACK #-} (SwitchSubscribed x a)
1951−
1952−invalidate :: IORef [SomeSwitchSubscribed x] -> WeakList (Invalidator x) -> IO (WeakList (Invalidator x))
1953−invalidate toReconnectRef wis = do
1954− forM_ wis $ \wi -> do
1955− mi <- deRefWeak wi
1956− case mi of
1957− Nothing -> do
1958− traceInvalidate "invalidate Dead"
1959− return () --TODO: Should we clean this up here?
1960− Just i -> do
1961− finalize wi -- Once something's invalidated, it doesn't need to hang around; this will change when some things are strict
1962− case i of
1963− InvalidatorPull p -> do
1964− traceInvalidate $ "invalidate: Pull" <> showNodeId p
1965− mVal <- readIORef $ pullValue p
1966− forM_ mVal $ \val -> do
1967− writeIORef (pullValue p) Nothing
1968− writeIORef (pullSubscribedInvalidators val) =<< evaluate =<< invalidate toReconnectRef =<< readIORef (pullSubscribedInvalidators val)
1969− InvalidatorSwitch subscribed -> do
1970− traceInvalidate $ "invalidate: Switch" <> showNodeId subscribed
1971− modifyIORef' toReconnectRef (SomeSwitchSubscribed subscribed :)
1972− 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
1973−
1974−--------------------------------------------------------------------------------
1975−-- Reflex integration
1976−--------------------------------------------------------------------------------
1977−
1978−#ifndef SPECIALIZE_TO_SPIDERTIMELINE_GLOBAL
1979−-- When we're specializing, we include this from Reflex.Class instead, because
1980−-- it needs access to these types; when we're not, we want them here, so our
1981−-- instance isn't an orphan instance.
1982−#include "SpiderTimeline.include.hs"
1983−#include "SpiderTimelineHost.include.hs"
1984−#endif
1985−
1986−unsafeNewSpiderTimelineEnv :: forall x. IO (SpiderTimelineEnv x)
1987−unsafeNewSpiderTimelineEnv = do
1988− lock <- newMVar ()
1989− env <- newEventEnv
1990−#ifdef DEBUG
1991− depthRef <- newIORef 0
1992−#endif
1993− return $ SpiderTimelineEnv
1994− { _spiderTimeline_lock = lock
1995− , _spiderTimeline_eventEnv = env
1996−#ifdef DEBUG
1997− , _spiderTimeline_depth = depthRef
1998−#endif
1999− }
2000−
2001−#ifndef SPECIALIZE_TO_SPIDERTIMELINE_GLOBAL
2002−-- | Create a new SpiderTimelineEnv
2003−newSpiderTimeline :: IO (Some SpiderTimelineEnv)
2004−newSpiderTimeline = withSpiderTimeline (pure . Some.This)
2005−
2006−data LocalSpiderTimeline x s
2007−
2008−instance Reifies s (SpiderTimelineEnv x) =>
2009− HasSpiderTimeline (LocalSpiderTimeline x s) where
2010− spiderTimeline = localSpiderTimeline (Proxy :: Proxy s) $ reflect (Proxy :: Proxy s)
2011−
2012−localSpiderTimeline
2013− :: Proxy s
2014− -> SpiderTimelineEnv x
2015− -> SpiderTimelineEnv (LocalSpiderTimeline x s)
2016−localSpiderTimeline _ = unsafeCoerce
2017−
2018−-- | Pass a new timeline to the given function.
2019−withSpiderTimeline :: (forall x. HasSpiderTimeline x => SpiderTimelineEnv x -> IO r) -> IO r
2020−withSpiderTimeline k = do
2021− env <- unsafeNewSpiderTimelineEnv
2022− reify env $ \s -> k $ localSpiderTimeline s env
2023−#endif
2024−
2025−newtype SpiderPullM x a = SpiderPullM (BehaviorM x a) deriving (Functor, Applicative, Monad, MonadIO, MonadFix)
2026−
2027−newtype SpiderPushM x a = SpiderPushM (ComputeM x a) deriving (Functor, Applicative, Monad, MonadIO, MonadFix)
2028−
2029−#ifndef SPECIALIZE_TO_SPIDERTIMELINE_GLOBAL
2030−instance HasSpiderTimeline x => R.Reflex (SpiderTimeline x) where
2031− {-# SPECIALIZE instance R.Reflex (SpiderTimeline Global) #-}
2032− newtype Behavior (SpiderTimeline x) a = SpiderBehavior { unSpiderBehavior :: Behavior x a }
2033− newtype Event (SpiderTimeline x) a = SpiderEvent { unSpiderEvent :: Event x a }
2034− newtype Dynamic (SpiderTimeline x) a = SpiderDynamic { unSpiderDynamic :: Dynamic x (Identity a) } -- deriving (Functor, Applicative, Monad)
2035− newtype Incremental (SpiderTimeline x) p = SpiderIncremental { unSpiderIncremental :: Dynamic x p }
2036− type PullM (SpiderTimeline x) = SpiderPullM x
2037− type PushM (SpiderTimeline x) = SpiderPushM x
2038− {-# INLINABLE never #-}
2039− never = SpiderEvent eventNever
2040− {-# INLINABLE constant #-}
2041− constant = SpiderBehavior . behaviorConst
2042− {-# INLINE push #-}
2043− push f = SpiderEvent . push (coerce f) . unSpiderEvent
2044− {-# INLINE pushCheap #-}
2045− pushCheap f = SpiderEvent . pushCheap (coerce f) . unSpiderEvent
2046− {-# INLINABLE pull #-}
2047− pull = SpiderBehavior . pull . coerce
2048− {-# INLINABLE merge #-}
2049− merge = SpiderEvent . merge . dynamicConst . (coerce :: DMap k (R.Event (SpiderTimeline x)) -> DMap k (Event x))
2050− {-# INLINABLE fan #-}
2051− fan e = R.EventSelector $ SpiderEvent . select (fan (unSpiderEvent e))
2052− {-# INLINABLE switch #-}
2053− switch = SpiderEvent . switch . (coerce :: Behavior x (R.Event (SpiderTimeline x) a) -> Behavior x (Event x a)) . unSpiderBehavior
2054− {-# INLINABLE coincidence #-}
2055− coincidence = SpiderEvent . coincidence . (coerce :: Event x (R.Event (SpiderTimeline x) a) -> Event x (Event x a)) . unSpiderEvent
2056− {-# INLINABLE current #-}
2057− current = SpiderBehavior . dynamicCurrent . unSpiderDynamic
2058− {-# INLINABLE updated #-}
2059− updated = coerce $ SpiderEvent . dynamicUpdated . unSpiderDynamic
2060− {-# INLINABLE unsafeBuildDynamic #-}
2061− unsafeBuildDynamic readV0 v' = SpiderDynamic $ dynamicDynIdentity $ unsafeDyn (coerce readV0) $ coerce $ unSpiderEvent v'
2062− {-# INLINABLE unsafeBuildIncremental #-}
2063− unsafeBuildIncremental readV0 dv = SpiderIncremental $ dynamicDyn $ unsafeDyn (coerce readV0) $ unSpiderEvent dv
2064− {-# INLINABLE mergeIncremental #-}
2065− mergeIncremental = SpiderEvent . merge . (unsafeCoerce :: Dynamic x (PatchDMap k (R.Event (SpiderTimeline x))) -> Dynamic x (PatchDMap k (Event x))) . unSpiderIncremental
2066− {-# INLINABLE mergeIncrementalWithMove #-}
2067− mergeIncrementalWithMove = SpiderEvent . mergeWithMove . (unsafeCoerce :: Dynamic x (PatchDMapWithMove k (R.Event (SpiderTimeline x))) -> Dynamic x (PatchDMapWithMove k (Event x))) . unSpiderIncremental
2068− {-# INLINABLE currentIncremental #-}
2069− currentIncremental = SpiderBehavior . dynamicCurrent . unSpiderIncremental
2070− {-# INLINABLE updatedIncremental #-}
2071− updatedIncremental = SpiderEvent . dynamicUpdated . unSpiderIncremental
2072− {-# INLINABLE incrementalToDynamic #-}
2073− incrementalToDynamic (SpiderIncremental i) = SpiderDynamic $ dynamicDynIdentity $ unsafeDyn (readBehaviorUntracked $ dynamicCurrent i) $ flip push (dynamicUpdated i) $ \p -> do
2074− c <- readBehaviorUntracked $ dynamicCurrent i
2075− return $ Identity <$> apply p c --TODO: Avoid the redundant 'apply'
2076− eventCoercion Coercion = Coercion
2077− behaviorCoercion Coercion = Coercion
2078− dynamicCoercion = unsafeCoerce --TODO: How can we avoid this unsafeCoerce? This is safe only because we know how Identity works as a Patch instance
2079−#endif
2080−
2081−data RootTrigger x a = forall k. GCompare k => RootTrigger (WeakBag (Subscriber x a), IORef (DMap k Identity), k a)
2082−
2083−data SpiderEventHandle x a = SpiderEventHandle
2084− { spiderEventHandleSubscription :: EventSubscription x
2085− , spiderEventHandleValue :: IORef (Maybe a)
2086− }
2087−
2088−instance MonadRef (EventM x) where
2089− type Ref (EventM x) = Ref IO
2090− {-# INLINABLE newRef #-}
2091− {-# INLINABLE readRef #-}
2092− {-# INLINABLE writeRef #-}
2093− newRef = liftIO . newRef
2094− readRef = liftIO . readRef
2095− writeRef r a = liftIO $ writeRef r a
2096−
2097−instance MonadAtomicRef (EventM x) where
2098− {-# INLINABLE atomicModifyRef #-}
2099− atomicModifyRef r f = liftIO $ atomicModifyRef r f
2100−
2101−-- | The monad for actions that manipulate a Spider timeline identified by @x@
2102−newtype SpiderHost x a = SpiderHost { unSpiderHost :: ReaderT (SpiderTimelineEnv x) IO a } deriving (Functor, Applicative, MonadFix, MonadIO, MonadException, MonadAsyncException)
2103−
2104−instance Monad (SpiderHost x) where
2105− {-# INLINABLE (>>=) #-}
2106− SpiderHost x >>= f = SpiderHost $ x >>= unSpiderHost . f
2107− {-# INLINABLE (>>) #-}
2108− SpiderHost x >> SpiderHost y = SpiderHost $ x >> y
2109− {-# INLINABLE return #-}
2110− return x = SpiderHost $ return x
2111− {-# INLINABLE fail #-}
2112− fail s = SpiderHost $ fail s
2113−
2114−-- | Run an action affecting the global Spider timeline; this will be guarded by
2115−-- a mutex for that timeline
2116−runSpiderHost :: SpiderHost Global a -> IO a
2117−runSpiderHost (SpiderHost a) = runReaderT a globalSpiderTimelineEnv
2118−
2119−#ifndef SPECIALIZE_TO_SPIDERTIMELINE_GLOBAL
2120−-- | Run an action affecting a given Spider timeline; this will be guarded by a
2121−-- mutex for that timeline
2122−runSpiderHostForTimeline :: SpiderHost x a -> SpiderTimelineEnv x -> IO a
2123−runSpiderHostForTimeline (SpiderHost a) = runReaderT a
2124−#endif
2125−
2126−newtype SpiderHostFrame x a = SpiderHostFrame { runSpiderHostFrame :: EventM x a } deriving (Functor, Applicative, MonadFix, MonadIO, MonadException, MonadAsyncException)
2127−
2128−instance Monad (SpiderHostFrame x) where
2129− {-# INLINABLE (>>=) #-}
2130− SpiderHostFrame x >>= f = SpiderHostFrame $ x >>= runSpiderHostFrame . f
2131− {-# INLINABLE (>>) #-}
2132− SpiderHostFrame x >> SpiderHostFrame y = SpiderHostFrame $ x >> y
2133− {-# INLINABLE return #-}
2134− return x = SpiderHostFrame $ return x
2135− {-# INLINABLE fail #-}
2136− fail s = SpiderHostFrame $ fail s
2137−
2138−newEventWithTriggerIO :: (RootTrigger x a -> IO (IO ())) -> IO (Event x a)
2139−newEventWithTriggerIO f = do
2140− es <- newFanEventWithTriggerIO $ \Refl -> f
2141− return $ select es Refl
2142−
2143−newFanEventWithTriggerIO :: GCompare k => (forall a. k a -> RootTrigger x a -> IO (IO ())) -> IO (EventSelector x k)
2144−newFanEventWithTriggerIO f = do
2145− occRef <- newIORef DMap.empty
2146− subscribedRef <- newIORef DMap.empty
2147− let !r = Root
2148− { rootOccurrence = occRef
2149− , rootSubscribed = subscribedRef
2150− , rootInit = f
2151− }
2152− return $ EventSelector $ \k -> eventRoot k r
2153−
2154−newtype ReadPhase x a = ReadPhase (ResultM x a) deriving (Functor, Applicative, Monad, MonadFix)
2155−
2156−instance MonadRef (SpiderHost x) where
2157− type Ref (SpiderHost x) = Ref IO
2158− newRef = SpiderHost . newRef
2159− readRef = SpiderHost . readRef
2160− writeRef r = SpiderHost . writeRef r
2161−
2162−instance MonadAtomicRef (SpiderHost x) where
2163− atomicModifyRef r = SpiderHost . atomicModifyRef r
2164−
2165−instance MonadRef (SpiderHostFrame x) where
2166− type Ref (SpiderHostFrame x) = Ref IO
2167− newRef = SpiderHostFrame . newRef
2168− readRef = SpiderHostFrame . readRef
2169− writeRef r = SpiderHostFrame . writeRef r
2170−
2171−instance MonadAtomicRef (SpiderHostFrame x) where
2172− atomicModifyRef r = SpiderHostFrame . atomicModifyRef r
2173−
2174−instance PrimMonad (SpiderHostFrame x) where
2175− type PrimState (SpiderHostFrame x) = PrimState IO
2176− primitive = SpiderHostFrame . EventM . primitive