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1−{-# LANGUAGE CPP, ExistentialQuantification, GADTs, ScopedTypeVariables, TypeFamilies, FlexibleInstances, MultiParamTypeClasses, GeneralizedNewtypeDeriving, RankNTypes, BangPatterns, UndecidableInstances, EmptyDataDecls, RecursiveDo, RoleAnnotations, LambdaCase #-}
2−module Reflex.Spider.Internal where
4−import Prelude hiding (mapM, mapM_, any, sequence, concat)
6−import qualified Reflex.Class as R
7−import qualified Reflex.Host.Class as R
10−import System.Mem.Weak
12−import Data.Traversable
13−import Control.Monad hiding (mapM, mapM_, forM_, forM, sequence)
14−import Control.Monad.Reader hiding (mapM, mapM_, forM_, forM, sequence)
16−import Control.Applicative
17−import Data.Dependent.Map (DMap, DSum (..))
18−import qualified Data.Dependent.Map as DMap
19−import Data.GADT.Compare
20−import Data.Functor.Misc
22−import Data.IntMap (IntMap)
23−import qualified Data.IntMap as IntMap
24−import Control.Monad.Ref
25−import Data.Monoid ((<>))
27−import System.IO.Unsafe
29−import Control.Monad.Primitive
31−debugPropagate :: Bool
33−debugInvalidateHeight :: Bool
41−debugInvalidateHeight = True
43−class HasNodeId a where
44− getNodeId :: a -> Int
46−instance HasNodeId (Hold a) where
47− getNodeId = holdNodeId
49−instance HasNodeId (PushSubscribed a b) where
50− getNodeId = pushSubscribedNodeId
52−instance HasNodeId (SwitchSubscribed a) where
53− getNodeId = switchSubscribedNodeId
55−instance HasNodeId (MergeSubscribed a) where
56− getNodeId = mergeSubscribedNodeId
58−instance HasNodeId (FanSubscribed a) where
59− getNodeId = fanSubscribedNodeId
61−instance HasNodeId (CoincidenceSubscribed a) where
62− getNodeId = coincidenceSubscribedNodeId
64−instance HasNodeId (RootSubscribed a) where
65− getNodeId = rootSubscribedNodeId
67−showNodeId :: HasNodeId a => a -> String
68−showNodeId = ("#"<>) . show . getNodeId
72−debugPropagate = False
74−debugInvalidateHeight = False
76−showNodeId :: a -> String
82−{-# NOINLINE nextNodeIdRef #-}
83−nextNodeIdRef :: IORef Int
84−nextNodeIdRef = unsafePerformIO $ newIORef 1
86−{-# NOINLINE unsafeNodeId #-}
87−unsafeNodeId :: a -> Int
88−unsafeNodeId a = unsafePerformIO $ do
90− atomicModifyIORef' nextNodeIdRef $ \n -> (succ n, n)
93−--TODO: Figure out why certain things are not 'representational', then make them representational so we can use coerce
94−--type role Hold representational
96− = Hold { holdValue :: !(IORef a)
97− , holdInvalidators :: !(IORef [Weak Invalidator])
98− -- We need to use 'Any' for the next two things, because otherwise Hold inherits a nominal role for its 'a' parameter, and we want to be able to use 'coerce'
99− , holdSubscriber :: !(IORef Any) -- Keeps its subscription alive; for some reason, a regular (or strict) reference to the Subscriber itself wasn't working, so had to use an IORef
100− , holdParent :: !(IORef Any) -- Keeps its parent alive (will be undefined until the hold is initialized --TODO: Probably shouldn't be an IORef
107− = EventEnv { eventEnvAssignments :: !(IORef [SomeAssignment])
108− , eventEnvHoldInits :: !(IORef [SomeHoldInit])
109− , eventEnvClears :: !(IORef [SomeMaybeIORef])
110− , eventEnvCurrentHeight :: !(IORef Int)
111− , eventEnvCoincidenceInfos :: !(IORef [SomeCoincidenceInfo])
112− , eventEnvDelayedMerges :: !(IORef (IntMap [DelayedMerge]))
115−runEventM :: EventM a -> EventEnv -> IO a
116−runEventM = runReaderT . unEventM
118−askToAssignRef :: EventM (IORef [SomeAssignment])
119−askToAssignRef = EventM $ asks eventEnvAssignments
121−askHoldInitRef :: EventM (IORef [SomeHoldInit])
122−askHoldInitRef = EventM $ asks eventEnvHoldInits
124−getCurrentHeight :: EventM Int
125−getCurrentHeight = EventM $ do
126− heightRef <- asks eventEnvCurrentHeight
127− liftIO $ readIORef heightRef
129−putCurrentHeight :: Int -> EventM ()
130−putCurrentHeight h = EventM $ do
131− heightRef <- asks eventEnvCurrentHeight
132− liftIO $ writeIORef heightRef h
134−scheduleClear :: IORef (Maybe a) -> EventM ()
135−scheduleClear r = EventM $ do
136− clears <- asks eventEnvClears
137− liftIO $ modifyIORef' clears (SomeMaybeIORef r :)
139−scheduleMerge :: Int -> MergeSubscribed a -> EventM ()
140−scheduleMerge height subscribed = EventM $ do
141− delayedRef <- asks eventEnvDelayedMerges
142− liftIO $ modifyIORef' delayedRef $ IntMap.insertWith (++) height [DelayedMerge subscribed]
144−emitCoincidenceInfo :: SomeCoincidenceInfo -> EventM ()
145−emitCoincidenceInfo sci = EventM $ do
146− ciRef <- asks eventEnvCoincidenceInfos
147− liftIO $ modifyIORef' ciRef (sci:)
149−-- Note: hold cannot examine its event until after the phase is over
150−hold :: a -> Event a -> EventM (Behavior a)
152− holdInitRef <- askHoldInitRef
154− valRef <- newIORef v0
155− invsRef <- newIORef []
156− parentRef <- newIORef $ error "hold not yet initialized (parent)"
157− subscriberRef <- newIORef $ error "hold not yet initialized (subscriber)"
159− { holdValue = valRef
160− , holdInvalidators = invsRef
161− , holdSubscriber = subscriberRef
162− , holdParent = parentRef
164− , holdNodeId = unsafeNodeId (v0, e)
167− !s = SubscriberHold h
168− writeIORef subscriberRef $ unsafeCoerce s
169− modifyIORef' holdInitRef (SomeHoldInit e h :)
170− return $ BehaviorHold h
172−subscribeHold :: Event a -> Hold a -> EventM ()
173−subscribeHold e h = do
174− toAssignRef <- askToAssignRef
175− !s <- liftIO $ liftM unsafeCoerce $ readIORef $ holdSubscriber h -- This must be performed strictly so that the weak pointer points at the actual item
176− ws <- liftIO $ mkWeakPtrWithDebug s "holdSubscriber"
177− subd <- subscribe e $ WeakSubscriberSimple ws
178− liftIO $ writeIORef (holdParent h) $ unsafeCoerce subd
179− occ <- liftIO $ getEventSubscribedOcc subd
181− Nothing -> return ()
182− Just o -> liftIO $ modifyIORef' toAssignRef (SomeAssignment h o :)
184−--type role BehaviorM representational
185−-- BehaviorM can sample behaviors
186−newtype BehaviorM a = BehaviorM { unBehaviorM :: ReaderT (Maybe (Weak Invalidator, IORef [SomeBehaviorSubscribed])) IO a } deriving (Functor, Applicative, Monad, MonadIO, MonadFix)
188−data BehaviorSubscribed a
189− = BehaviorSubscribedHold (Hold a)
190− | BehaviorSubscribedPull (PullSubscribed a)
192−data SomeBehaviorSubscribed = forall a. SomeBehaviorSubscribed (BehaviorSubscribed a)
194−--type role PullSubscribed representational
195−data PullSubscribed a
196− = PullSubscribed { pullSubscribedValue :: !a
197− , pullSubscribedInvalidators :: !(IORef [Weak Invalidator])
198− , pullSubscribedOwnInvalidator :: !Invalidator
199− , pullSubscribedParents :: ![SomeBehaviorSubscribed] -- Need to keep parent behaviors alive, or they won't let us know when they're invalidated
202−--type role Pull representational
204− = Pull { pullValue :: !(IORef (Maybe (PullSubscribed a)))
205− , pullCompute :: !(BehaviorM a)
209− = forall a. InvalidatorPull (Pull a)
210− | forall a. InvalidatorSwitch (SwitchSubscribed a)
212−data RootSubscribed a
213− = RootSubscribed { rootSubscribedSubscribers :: !(IORef [WeakSubscriber a])
214− , rootSubscribedOccurrence :: !(IORef (Maybe a)) -- Alias to rootOccurrence
218− = Root { rootOccurrence :: !(IORef (Maybe a)) -- The currently-firing occurrence of this event
219− , rootSubscribed :: !(IORef (Maybe (RootSubscribed a)))
220− , rootInit :: !(RootTrigger a -> IO (IO ()))
223−data SomeHoldInit = forall a. SomeHoldInit (Event a) (Hold a)
225−-- EventM can do everything BehaviorM can, plus create holds
226−newtype EventM a = EventM { unEventM :: ReaderT EventEnv IO a } deriving (Functor, Applicative, Monad, MonadFix, MonadIO) -- 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
228−data PushSubscribed a b
229− = PushSubscribed { pushSubscribedOccurrence :: !(IORef (Maybe b)) -- If the current height is less than our height, this should always be Nothing; during our height, this will get filled in at some point, always before our children are notified; after our height, this will be filled in with the correct value (Nothing if we are not firing, Just if we are)
230− , pushSubscribedHeight :: !(IORef Int)
231− , pushSubscribedSubscribers :: !(IORef [WeakSubscriber b])
232− , pushSubscribedSelf :: !(Subscriber a) -- Hold this in memory to ensure our WeakReferences don't die
233− , pushSubscribedParent :: !(EventSubscribed a)
235− , pushSubscribedNodeId :: Int
240− = Push { pushCompute :: !(a -> EventM (Maybe b)) -- Compute the current firing value; assumes that its parent has been computed
241− , pushParent :: !(Event a)
242− , pushSubscribed :: !(IORef (Maybe (PushSubscribed a b))) --TODO: Can we replace this with an unsafePerformIO thunk?
245−data MergeSubscribed k
246− = MergeSubscribed { mergeSubscribedOccurrence :: !(IORef (Maybe (DMap k)))
247− , mergeSubscribedAccum :: !(IORef (DMap k)) -- This will accumulate occurrences until our height is reached, at which point it will be transferred to mergeSubscribedOccurrence
248− , mergeSubscribedHeight :: !(IORef Int)
249− , mergeSubscribedSubscribers :: !(IORef [WeakSubscriber (DMap k)])
250− , mergeSubscribedSelf :: !Any -- Hold all our Subscribers in memory
251− , mergeSubscribedParents :: !(DMap (WrapArg EventSubscribed k))
253− , mergeSubscribedNodeId :: Int
257−--TODO: DMap sucks; we should really write something better (with a functor for the value as well as the key)
259− = Merge { mergeParents :: !(DMap (WrapArg Event k))
260− , mergeSubscribed :: !(IORef (Maybe (MergeSubscribed k))) --TODO: Can we replace this with an unsafePerformIO thunk?
263−data FanSubscriberKey k a where
264− FanSubscriberKey :: k a -> FanSubscriberKey k [WeakSubscriber a]
266−instance GEq k => GEq (FanSubscriberKey k) where
267− geq (FanSubscriberKey a) (FanSubscriberKey b) = case geq a b of
269− Just Refl -> Just Refl
271−instance GCompare k => GCompare (FanSubscriberKey k) where
272− gcompare (FanSubscriberKey a) (FanSubscriberKey b) = case gcompare a b of
278− = FanSubscribed { fanSubscribedSubscribers :: !(IORef (DMap (FanSubscriberKey k)))
279− , fanSubscribedParent :: !(EventSubscribed (DMap k))
280− , fanSubscribedSelf :: !(Subscriber (DMap k))
282− , fanSubscribedNodeId :: Int
287− = Fan { fanParent :: !(Event (DMap k))
288− , fanSubscribed :: !(IORef (Maybe (FanSubscribed k)))
291−data SwitchSubscribed a
292− = SwitchSubscribed { switchSubscribedOccurrence :: !(IORef (Maybe a))
293− , switchSubscribedHeight :: !(IORef Int)
294− , switchSubscribedSubscribers :: !(IORef [WeakSubscriber a])
295− , switchSubscribedSelf :: !(Subscriber a)
296− , switchSubscribedSelfWeak :: !(IORef (Weak (Subscriber a)))
297− , switchSubscribedOwnInvalidator :: !Invalidator
298− , switchSubscribedOwnWeakInvalidator :: !(IORef (Weak Invalidator))
299− , switchSubscribedBehaviorParents :: !(IORef [SomeBehaviorSubscribed])
300− , switchSubscribedParent :: !(Behavior (Event a))
301− , switchSubscribedCurrentParent :: !(IORef (EventSubscribed a))
303− , switchSubscribedNodeId :: Int
308− = Switch { switchParent :: !(Behavior (Event a))
309− , switchSubscribed :: !(IORef (Maybe (SwitchSubscribed a)))
312−data CoincidenceSubscribed a
313− = CoincidenceSubscribed { coincidenceSubscribedOccurrence :: !(IORef (Maybe a))
314− , coincidenceSubscribedSubscribers :: !(IORef [WeakSubscriber a])
315− , coincidenceSubscribedHeight :: !(IORef Int)
316− , coincidenceSubscribedOuter :: !(Subscriber (Event a))
317− , coincidenceSubscribedOuterParent :: !(EventSubscribed (Event a))
318− , coincidenceSubscribedInnerParent :: !(IORef (Maybe (EventSubscribed a)))
320− , coincidenceSubscribedNodeId :: Int
325− = Coincidence { coincidenceParent :: !(Event (Event a))
326− , coincidenceSubscribed :: !(IORef (Maybe (CoincidenceSubscribed a)))
329−data Box a = Box { unBox :: a }
331−--type WeakSubscriber a = Weak (Subscriber a)
332−data WeakSubscriber a
333− = forall k. GCompare k => WeakSubscriberMerge !(k a) !(Weak (Box (MergeSubscribed k))) --TODO: Can we inline the GCompare?
334− | WeakSubscriberSimple !(Weak (Subscriber a))
336−showWeakSubscriberType :: WeakSubscriber a -> String
337−showWeakSubscriberType = \case
338− WeakSubscriberMerge _ _ -> "WeakSubscriberMerge"
339− WeakSubscriberSimple _ -> "WeakSubscriberSimple"
341−deRefWeakSubscriber :: WeakSubscriber a -> IO (Maybe (Subscriber a))
342−deRefWeakSubscriber ws = case ws of
343− WeakSubscriberSimple w -> deRefWeak w
344− WeakSubscriberMerge k w -> liftM (fmap $ SubscriberMerge k . unBox) $ deRefWeak w
347− = forall b. SubscriberPush !(a -> EventM (Maybe b)) (PushSubscribed a b)
348− | forall k. GCompare k => SubscriberMerge !(k a) (MergeSubscribed k) --TODO: Can we inline the GCompare?
349− | forall k. (GCompare k, a ~ DMap k) => SubscriberFan (FanSubscribed k)
350− | SubscriberHold !(Hold a)
351− | SubscriberSwitch (SwitchSubscribed a)
352− | forall b. a ~ Event b => SubscriberCoincidenceOuter (CoincidenceSubscribed b)
353− | SubscriberCoincidenceInner (CoincidenceSubscribed a)
355−showSubscriberType :: Subscriber a -> String
356−showSubscriberType = \case
357− SubscriberPush _ _ -> "SubscriberPush"
358− SubscriberMerge _ _ -> "SubscriberMerge"
359− SubscriberFan _ -> "SubscriberFan"
360− SubscriberHold _ -> "SubscriberHold"
361− SubscriberSwitch _ -> "SubscriberSwitch"
362− SubscriberCoincidenceOuter _ -> "SubscriberCoincidenceOuter"
363− SubscriberCoincidenceInner _ -> "SubscriberCoincidenceInner"
366− = EventRoot !(Root a)
368− | forall b. EventPush !(Push b a)
369− | forall k. (GCompare k, a ~ DMap k) => EventMerge !(Merge k)
370− | forall k. GCompare k => EventFan !(k a) !(Fan k)
371− | EventSwitch !(Switch a)
372− | EventCoincidence !(Coincidence a)
374−showEventType :: Event a -> String
375−showEventType = \case
376− EventRoot _ -> "EventRoot"
377− EventNever -> "EventNever"
378− EventPush _ -> "EventPush"
379− EventMerge _ -> "EventMerge"
380− EventFan _ _ -> "EventFan"
381− EventSwitch _ -> "EventSwitch"
382− EventCoincidence _ -> "EventCoincidence"
384−data EventSubscribed a
385− = EventSubscribedRoot {-# NOUNPACK #-} (RootSubscribed a)
386− | EventSubscribedNever
387− | forall b. EventSubscribedPush !(PushSubscribed b a)
388− | forall k. (GCompare k, a ~ DMap k) => EventSubscribedMerge !(MergeSubscribed k)
389− | forall k. GCompare k => EventSubscribedFan !(k a) !(FanSubscribed k)
390− | EventSubscribedSwitch !(SwitchSubscribed a)
391− | EventSubscribedCoincidence !(CoincidenceSubscribed a)
393−--type role Behavior representational
395− = BehaviorHold !(Hold a)
397− | BehaviorPull !(Pull a)
399−-- ResultM can read behaviors and events
400−type ResultM = EventM
402−{-# NOINLINE unsafeNewIORef #-}
403−unsafeNewIORef :: a -> b -> IORef b
404−unsafeNewIORef _ b = unsafePerformIO $ newIORef b
406−instance Functor Event where
407− fmap f = push $ return . Just . f
409−instance Functor Behavior where
410− fmap f = pull . liftM f . readBehaviorTracked
412−{-# NOINLINE push #-} --TODO: If this is helpful, we can get rid of the unsafeNewIORef and use unsafePerformIO directly
413−push :: (a -> EventM (Maybe b)) -> Event a -> Event b
414−push f e = EventPush $ Push
417− , pushSubscribed = unsafeNewIORef (f, e) Nothing --TODO: Does the use of the tuple here create unnecessary overhead?
419−{-# RULES "push/push" forall f g e. push f (push g e) = push (maybe (return Nothing) f <=< g) e #-}
421−{-# NOINLINE pull #-}
422−pull :: BehaviorM a -> Behavior a
423−pull a = BehaviorPull $ Pull
425− , pullValue = unsafeNewIORef a Nothing
427−{-# RULES "pull/pull" forall a. pull (readBehaviorTracked (pull a)) = pull a #-}
429−{-# NOINLINE switch #-}
430−switch :: Behavior (Event a) -> Event a
431−switch a = EventSwitch $ Switch
433− , switchSubscribed = unsafeNewIORef a Nothing
435−{-# RULES "switch/constB" forall e. switch (BehaviorConst e) = e #-}
437−coincidence :: Event (Event a) -> Event a
438−coincidence a = EventCoincidence $ Coincidence
439− { coincidenceParent = a
440− , coincidenceSubscribed = unsafeNewIORef a Nothing
443−newRoot :: IO (Root a)
445− occRef <- newIORef Nothing
446− subscribedRef <- newIORef Nothing
448− { rootOccurrence = occRef
449− , rootSubscribed = subscribedRef
450− , rootInit = const $ return $ return ()
453−propagateAndUpdateSubscribersRef :: IORef [WeakSubscriber a] -> a -> EventM ()
454−propagateAndUpdateSubscribersRef subscribersRef a = do
455− subscribers <- liftIO $ readIORef subscribersRef
456− liftIO $ writeIORef subscribersRef []
457− stillAlive <- propagate a subscribers
458− liftIO $ modifyIORef' subscribersRef (++stillAlive)
460−-- Propagate the given event occurrence; before cleaning up, run the given action, which may read the state of events and behaviors
461−run :: [DSum RootTrigger] -> ResultM b -> IO b
463− when debugPropagate $ putStrLn "Running an event frame"
464− result <- runFrame $ do
465− forM_ roots $ \(RootTrigger (_, occRef) :=> a) -> do
466− liftIO $ writeIORef occRef $ Just a
467− scheduleClear occRef
468− forM_ roots $ \(RootTrigger (subscribersRef, _) :=> a) -> do
469− propagateAndUpdateSubscribersRef subscribersRef a
470− delayedRef <- EventM $ asks eventEnvDelayedMerges
472− delayed <- liftIO $ readIORef delayedRef
473− case IntMap.minViewWithKey delayed of
474− Nothing -> return ()
475− Just ((currentHeight, current), future) -> do
476− when debugPropagate $ liftIO $ putStrLn $ "Running height " ++ show currentHeight
477− putCurrentHeight currentHeight
478− liftIO $ writeIORef delayedRef future
479− forM_ current $ \d -> case d of
480− DelayedMerge subscribed -> do
481− height <- liftIO $ readIORef $ mergeSubscribedHeight subscribed
482− case height `compare` currentHeight of
483− LT -> error "Somehow a merge's height has been decreased after it was scheduled"
484− GT -> scheduleMerge height subscribed -- The height has been increased (by a coincidence event; TODO: is this the only way?)
486− m <- liftIO $ readIORef $ mergeSubscribedAccum subscribed
487− liftIO $ writeIORef (mergeSubscribedAccum subscribed) DMap.empty
488− --TODO: Assert that m is not empty
489− liftIO $ writeIORef (mergeSubscribedOccurrence subscribed) $ Just m
490− scheduleClear $ mergeSubscribedOccurrence subscribed
491− propagateAndUpdateSubscribersRef (mergeSubscribedSubscribers subscribed) m
494− putCurrentHeight maxBound
496− when debugPropagate $ putStrLn "Done running an event frame"
499−data SomeMaybeIORef = forall a. SomeMaybeIORef (IORef (Maybe a))
501−data SomeAssignment = forall a. SomeAssignment (Hold a) a
503−data DelayedMerge = forall k. DelayedMerge (MergeSubscribed k)
505−debugFinalize :: Bool
506−debugFinalize = False
508−mkWeakPtrWithDebug :: a -> String -> IO (Weak a)
509−mkWeakPtrWithDebug x debugNote = mkWeakPtr x $
511− then Just $ putStrLn $ "finalizing: " ++ debugNote
514−type WeakList a = [Weak a]
516−--TODO: Is it faster to clean up every time, or to occasionally go through and clean up as needed?
517−traverseAndCleanWeakList_ :: Monad m => (wa -> m (Maybe a)) -> [wa] -> (a -> m ()) -> m [wa]
518−traverseAndCleanWeakList_ deRef ws f = go ws
519− where go [] = return []
529−-- | Propagate everything at the current height
530−propagate :: a -> [WeakSubscriber a] -> EventM [WeakSubscriber a]
531−propagate a subscribers = do
532− traverseAndCleanWeakList_ (liftIO . deRefWeakSubscriber) subscribers $ \s -> case s of
533− SubscriberPush compute subscribed -> do
534− when debugPropagate $ liftIO $ putStrLn $ "SubscriberPush" <> showNodeId subscribed
537− Nothing -> return () -- No need to write a Nothing back into the Ref
539− liftIO $ writeIORef (pushSubscribedOccurrence subscribed) occ
540− scheduleClear $ pushSubscribedOccurrence subscribed
541− liftIO . writeIORef (pushSubscribedSubscribers subscribed) =<< propagate o =<< liftIO (readIORef (pushSubscribedSubscribers subscribed))
542− SubscriberMerge k subscribed -> do
543− when debugPropagate $ liftIO $ putStrLn $ "SubscriberMerge" <> showNodeId subscribed
544− oldM <- liftIO $ readIORef $ mergeSubscribedAccum subscribed
545− liftIO $ writeIORef (mergeSubscribedAccum subscribed) $ DMap.insertWith (error "Same key fired multiple times for") k a oldM
546− when (DMap.null oldM) $ do -- Only schedule the firing once
547− height <- liftIO $ readIORef $ mergeSubscribedHeight subscribed
548− --TODO: assertions about height
549− currentHeight <- getCurrentHeight
550− when (height <= currentHeight) $ error $ "Height (" ++ show height ++ ") is not greater than current height (" ++ show currentHeight ++ ")"
551− scheduleMerge height subscribed
552− SubscriberFan subscribed -> do
553− subs <- liftIO $ readIORef $ fanSubscribedSubscribers subscribed
554− when debugPropagate $ liftIO $ putStrLn $ "SubscriberFan" <> showNodeId subscribed <> ": " ++ show (DMap.size subs) ++ " keys subscribed, " ++ show (DMap.size a) ++ " keys firing"
555− --TODO: We need a better DMap intersection; here, we are assuming that the number of firing keys is small and the number of subscribers is large
556− forM_ (DMap.toList a) $ \(k :=> v) -> case DMap.lookup (FanSubscriberKey k) subs of
558− when debugPropagate $ liftIO $ putStrLn "No subscriber for key"
561− _ <- propagate v subsubs --TODO: use the value of this
563− --TODO: The following is way too slow to do all the time
564− subs' <- liftIO $ forM (DMap.toList subs) $ ((\(FanSubscriberKey k :=> subsubs) -> do
565− subsubs' <- traverseAndCleanWeakList_ (liftIO . deRefWeakSubscriber) subsubs (const $ return ())
566− return $ if null subsubs' then Nothing else Just $ FanSubscriberKey k :=> subsubs') :: DSum (FanSubscriberKey k) -> IO (Maybe (DSum (FanSubscriberKey k))))
567− liftIO $ writeIORef (fanSubscribedSubscribers subscribed) $ DMap.fromDistinctAscList $ catMaybes subs'
568− SubscriberHold h -> do
569− invalidators <- liftIO $ readIORef $ holdInvalidators h
570− when debugPropagate $ liftIO $ putStrLn $ "SubscriberHold" <> showNodeId h <> ": " ++ show (length invalidators)
571− toAssignRef <- askToAssignRef
572− liftIO $ modifyIORef' toAssignRef (SomeAssignment h a :)
573− SubscriberSwitch subscribed -> do
574− when debugPropagate $ liftIO $ putStrLn $ "SubscriberSwitch" <> showNodeId subscribed
575− liftIO $ writeIORef (switchSubscribedOccurrence subscribed) $ Just a
576− scheduleClear $ switchSubscribedOccurrence subscribed
577− subs <- liftIO $ readIORef $ switchSubscribedSubscribers subscribed
578− liftIO . writeIORef (switchSubscribedSubscribers subscribed) =<< propagate a subs
579− SubscriberCoincidenceOuter subscribed -> do
580− when debugPropagate $ liftIO $ putStrLn $ "SubscriberCoincidenceOuter" <> showNodeId subscribed
581− outerHeight <- liftIO $ readIORef $ coincidenceSubscribedHeight subscribed
582− when debugPropagate $ liftIO $ putStrLn $ " outerHeight = " <> show outerHeight
583− (occ, innerHeight, innerSubd) <- subscribeCoincidenceInner a outerHeight subscribed
584− when debugPropagate $ liftIO $ putStrLn $ " isJust occ = " <> show (isJust occ)
585− when debugPropagate $ liftIO $ putStrLn $ " innerHeight = " <> show innerHeight
586− liftIO $ writeIORef (coincidenceSubscribedInnerParent subscribed) $ Just innerSubd
587− scheduleClear $ coincidenceSubscribedInnerParent subscribed
590− when (innerHeight > outerHeight) $ liftIO $ do -- If the event fires, it will fire at a later height
591− writeIORef (coincidenceSubscribedHeight subscribed) innerHeight
592− mapM_ invalidateSubscriberHeight =<< readIORef (coincidenceSubscribedSubscribers subscribed)
593− mapM_ recalculateSubscriberHeight =<< readIORef (coincidenceSubscribedSubscribers subscribed)
594− Just o -> do -- Since it's already firing, no need to adjust height
595− liftIO $ writeIORef (coincidenceSubscribedOccurrence subscribed) occ
596− scheduleClear $ coincidenceSubscribedOccurrence subscribed
597− liftIO . writeIORef (coincidenceSubscribedSubscribers subscribed) =<< propagate o =<< liftIO (readIORef (coincidenceSubscribedSubscribers subscribed))
598− SubscriberCoincidenceInner subscribed -> do
599− when debugPropagate $ liftIO $ putStrLn $ "SubscriberCoincidenceInner" <> showNodeId subscribed
600− liftIO $ writeIORef (coincidenceSubscribedOccurrence subscribed) $ Just a
601− scheduleClear $ coincidenceSubscribedOccurrence subscribed
602− liftIO . writeIORef (coincidenceSubscribedSubscribers subscribed) =<< propagate a =<< liftIO (readIORef (coincidenceSubscribedSubscribers subscribed))
604−data SomeCoincidenceInfo = forall a. SomeCoincidenceInfo (Weak (Subscriber a)) (Subscriber a) (Maybe (CoincidenceSubscribed a)) -- The CoincidenceSubscriber will be present only if heights need to be reset
606−subscribeCoincidenceInner :: Event a -> Int -> CoincidenceSubscribed a -> EventM (Maybe a, Int, EventSubscribed a)
607−subscribeCoincidenceInner o outerHeight subscribedUnsafe = do
608− let !subInner = SubscriberCoincidenceInner subscribedUnsafe
609− wsubInner <- liftIO $ mkWeakPtrWithDebug subInner "SubscriberCoincidenceInner"
610− innerSubd <- {-# SCC "innerSubd" #-} (subscribe o $ WeakSubscriberSimple wsubInner)
611− innerOcc <- liftIO $ getEventSubscribedOcc innerSubd
612− innerHeight <- liftIO $ readIORef $ eventSubscribedHeightRef innerSubd
613− let height = max innerHeight outerHeight
614− emitCoincidenceInfo $ SomeCoincidenceInfo wsubInner subInner $ if height > outerHeight then Just subscribedUnsafe else Nothing
615− return (innerOcc, height, innerSubd)
617−readBehavior :: Behavior a -> IO a
618−readBehavior b = runBehaviorM (readBehaviorTracked b) Nothing --TODO: Specialize readBehaviorTracked to the Nothing and Just cases
620−runBehaviorM :: BehaviorM a -> Maybe (Weak Invalidator, IORef [SomeBehaviorSubscribed]) -> IO a
621−runBehaviorM a mwi = runReaderT (unBehaviorM a) mwi
623−askInvalidator :: BehaviorM (Maybe (Weak Invalidator))
624−askInvalidator = liftM (fmap fst) $ BehaviorM ask
626−askParentsRef :: BehaviorM (Maybe (IORef [SomeBehaviorSubscribed]))
627−askParentsRef = liftM (fmap snd) $ BehaviorM ask
629−readBehaviorTracked :: Behavior a -> BehaviorM a
630−readBehaviorTracked b = case b of
631− BehaviorHold h -> do
632− result <- liftIO $ readIORef $ holdValue h
633− askInvalidator >>= mapM_ (\wi -> liftIO $ modifyIORef' (holdInvalidators h) (wi:))
634− askParentsRef >>= mapM_ (\r -> liftIO $ modifyIORef' r (SomeBehaviorSubscribed (BehaviorSubscribedHold h) :))
635− liftIO $ touch $ holdSubscriber h
637− BehaviorConst a -> return a
638− BehaviorPull p -> do
639− val <- liftIO $ readIORef $ pullValue p
641− Just subscribed -> do
642− askParentsRef >>= mapM_ (\r -> liftIO $ modifyIORef' r (SomeBehaviorSubscribed (BehaviorSubscribedPull subscribed) :))
643− askInvalidator >>= mapM_ (\wi -> liftIO $ modifyIORef' (pullSubscribedInvalidators subscribed) (wi:))
644− liftIO $ touch $ pullSubscribedOwnInvalidator subscribed
645− return $ pullSubscribedValue subscribed
647− let !i = InvalidatorPull p
648− wi <- liftIO $ mkWeakPtrWithDebug i "InvalidatorPull"
649− parentsRef <- liftIO $ newIORef []
650− a <- liftIO $ runReaderT (unBehaviorM $ pullCompute p) $ Just (wi, parentsRef)
651− invsRef <- liftIO . newIORef . maybeToList =<< askInvalidator
652− parents <- liftIO $ readIORef parentsRef
653− let subscribed = PullSubscribed
654− { pullSubscribedValue = a
655− , pullSubscribedInvalidators = invsRef
656− , pullSubscribedOwnInvalidator = i
657− , pullSubscribedParents = parents
659− liftIO $ writeIORef (pullValue p) $ Just subscribed
660− askParentsRef >>= mapM_ (\r -> liftIO $ modifyIORef' r (SomeBehaviorSubscribed (BehaviorSubscribedPull subscribed) :))
663−readEvent :: Event a -> ResultM (Maybe a)
664−readEvent e = case e of
665− EventRoot r -> liftIO $ readIORef $ rootOccurrence r
666− EventNever -> return Nothing
668− subscribed <- getPushSubscribed p
670− result <- readIORef $ pushSubscribedOccurrence subscribed -- Since ResultM is always called after the final height is reached, this will always be valid
671− touch $ pushSubscribedSelf subscribed
674− subscribed <- getMergeSubscribed m
676− result <- readIORef $ mergeSubscribedOccurrence subscribed
677− touch $ mergeSubscribedSelf subscribed
680− parentOcc <- readEvent $ fanParent f
681− return $ DMap.lookup k =<< parentOcc
683− subscribed <- getSwitchSubscribed s
685− result <- readIORef $ switchSubscribedOccurrence subscribed
686− touch $ switchSubscribedSelf subscribed
687− touch $ switchSubscribedOwnInvalidator subscribed
689− EventCoincidence c -> do
690− subscribed <- getCoincidenceSubscribed c
692− result <- readIORef $ coincidenceSubscribedOccurrence subscribed
693− touch $ coincidenceSubscribedOuter subscribed
694− --TODO: do we need to touch the inner subscriber?
697−-- Always refers to 0
698−{-# NOINLINE zeroRef #-}
700−zeroRef = unsafePerformIO $ newIORef 0
702−getEventSubscribed :: Event a -> EventM (EventSubscribed a)
703−getEventSubscribed e = case e of
704− EventRoot r -> liftM EventSubscribedRoot $ getRootSubscribed r
705− EventNever -> return EventSubscribedNever
706− EventPush p -> liftM EventSubscribedPush $ getPushSubscribed p
707− EventFan k f -> liftM (EventSubscribedFan k) $ getFanSubscribed f
708− EventMerge m -> liftM EventSubscribedMerge $ getMergeSubscribed m
709− EventSwitch s -> liftM EventSubscribedSwitch $ getSwitchSubscribed s
710− EventCoincidence c -> liftM EventSubscribedCoincidence $ getCoincidenceSubscribed c
712−debugSubscribe :: Bool
713−debugSubscribe = False
715−subscribeEventSubscribed :: EventSubscribed a -> WeakSubscriber a -> IO ()
716−subscribeEventSubscribed es ws = case es of
717− EventSubscribedRoot r -> do
718− when debugSubscribe $ liftIO $ putStrLn $ "subscribeEventSubscribed Root"
719− modifyIORef' (rootSubscribedSubscribers r) (ws:)
720− EventSubscribedNever -> do
721− when debugSubscribe $ liftIO $ putStrLn $ "subscribeEventSubscribed Never"
723− EventSubscribedPush subscribed -> do
724− when debugSubscribe $ liftIO $ putStrLn $ "subscribeEventSubscribed Push"
725− modifyIORef' (pushSubscribedSubscribers subscribed) (ws:)
726− EventSubscribedFan k subscribed -> do
727− when debugSubscribe $ liftIO $ putStrLn $ "subscribeEventSubscribed Fan"
728− modifyIORef' (fanSubscribedSubscribers subscribed) $ DMap.insertWith (++) (FanSubscriberKey k) [ws]
729− EventSubscribedMerge subscribed -> do
730− when debugSubscribe $ liftIO $ putStrLn $ "subscribeEventSubscribed Merge"
731− modifyIORef' (mergeSubscribedSubscribers subscribed) (ws:)
732− EventSubscribedSwitch subscribed -> do
733− when debugSubscribe $ liftIO $ putStrLn $ "subscribeEventSubscribed Switch"
734− modifyIORef' (switchSubscribedSubscribers subscribed) (ws:)
735− EventSubscribedCoincidence subscribed -> do
736− when debugSubscribe $ liftIO $ putStrLn $ "subscribeEventSubscribed Coincidence"
737− modifyIORef' (coincidenceSubscribedSubscribers subscribed) (ws:)
739−getEventSubscribedOcc :: EventSubscribed a -> IO (Maybe a)
740−getEventSubscribedOcc es = case es of
741− EventSubscribedRoot r -> readIORef $ rootSubscribedOccurrence r
742− EventSubscribedNever -> return Nothing
743− EventSubscribedPush subscribed -> readIORef $ pushSubscribedOccurrence subscribed
744− EventSubscribedFan k subscribed -> do
745− parentOcc <- getEventSubscribedOcc $ fanSubscribedParent subscribed
746− let occ = DMap.lookup k =<< parentOcc
748− EventSubscribedMerge subscribed -> readIORef $ mergeSubscribedOccurrence subscribed
749− EventSubscribedSwitch subscribed -> readIORef $ switchSubscribedOccurrence subscribed
750− EventSubscribedCoincidence subscribed -> readIORef $ coincidenceSubscribedOccurrence subscribed
752−eventSubscribedHeightRef :: EventSubscribed a -> IORef Int
753−eventSubscribedHeightRef es = case es of
754− EventSubscribedRoot _ -> zeroRef
755− EventSubscribedNever -> zeroRef
756− EventSubscribedPush subscribed -> pushSubscribedHeight subscribed
757− EventSubscribedFan _ subscribed -> eventSubscribedHeightRef $ fanSubscribedParent subscribed
758− EventSubscribedMerge subscribed -> mergeSubscribedHeight subscribed
759− EventSubscribedSwitch subscribed -> switchSubscribedHeight subscribed
760− EventSubscribedCoincidence subscribed -> coincidenceSubscribedHeight subscribed
762−subscribe :: Event a -> WeakSubscriber a -> EventM (EventSubscribed a)
764− subd <- getEventSubscribed e
765− liftIO $ subscribeEventSubscribed subd ws
768−noinlineFalse :: Bool
769−noinlineFalse = False
770−{-# NOINLINE noinlineFalse #-}
772−getRootSubscribed :: Root a -> EventM (RootSubscribed a)
773−getRootSubscribed r = do
774− mSubscribed <- liftIO $ readIORef $ rootSubscribed r
776− Just subscribed -> return subscribed
777− Nothing -> liftIO $ do
778− subscribersRef <- newIORef []
779− let !subscribed = RootSubscribed
780− { rootSubscribedOccurrence = rootOccurrence r
781− , rootSubscribedSubscribers = subscribersRef
783− -- Strangely, init needs the same stuff as a RootSubscribed has, but it must not be the same as the one that everyone's subscribing to, or it'll leak memory
784− uninit <- rootInit r $ RootTrigger (subscribersRef, rootOccurrence r)
785− addFinalizer subscribed $ do
786− when noinlineFalse $ putStr "" -- For some reason, without this line, the finalizer will run earlier than it should
787−-- putStrLn "Uninit root"
789− liftIO $ writeIORef (rootSubscribed r) $ Just subscribed
792−-- When getPushSubscribed returns, the PushSubscribed returned will have a fully filled-in
793−getPushSubscribed :: Push a b -> EventM (PushSubscribed a b)
794−getPushSubscribed p = do
795− mSubscribed <- liftIO $ readIORef $ pushSubscribed p
797− Just subscribed -> return subscribed
798− Nothing -> do -- Not yet subscribed
799− subscribedUnsafe <- liftIO $ unsafeInterleaveIO $ liftM fromJust $ readIORef $ pushSubscribed p
800− let !s = SubscriberPush (pushCompute p) subscribedUnsafe
801− ws <- liftIO $ mkWeakPtrWithDebug s "SubscriberPush"
802− subd <- subscribe (pushParent p) $ WeakSubscriberSimple ws
803− parentOcc <- liftIO $ getEventSubscribedOcc subd
804− occ <- liftM join $ mapM (pushCompute p) parentOcc
805− occRef <- liftIO $ newIORef occ
806− when (isJust occ) $ scheduleClear occRef
807− subscribersRef <- liftIO $ newIORef []
808− let subscribed = PushSubscribed
809− { pushSubscribedOccurrence = occRef
810− , pushSubscribedHeight = eventSubscribedHeightRef subd -- Since pushes have the same height as their parents, share the ref
811− , pushSubscribedSubscribers = subscribersRef
812− , pushSubscribedSelf = unsafeCoerce s
813− , pushSubscribedParent = subd
815− , pushSubscribedNodeId = unsafeNodeId p
818− liftIO $ writeIORef (pushSubscribed p) $ Just subscribed
821−getMergeSubscribed :: forall k. GCompare k => Merge k -> EventM (MergeSubscribed k)
822−getMergeSubscribed m = {-# SCC "getMergeSubscribed.entire" #-} do
823− mSubscribed <- liftIO $ readIORef $ mergeSubscribed m
825− Just subscribed -> return subscribed
826− Nothing -> if DMap.null $ mergeParents m then emptyMergeSubscribed else do
827− subscribedRef <- liftIO $ newIORef $ error "getMergeSubscribed: subscribedRef not yet initialized"
828− subscribedUnsafe <- liftIO $ unsafeInterleaveIO $ readIORef subscribedRef
829− let !s = Box subscribedUnsafe
830− ws <- liftIO $ mkWeakPtrWithDebug s "SubscriberMerge"
831− subscribers :: [(Any, Maybe (DSum k), Int, DSum (WrapArg EventSubscribed k))] <- forM (DMap.toList $ mergeParents m) $ {-# SCC "getMergeSubscribed.a" #-} \(WrapArg k :=> e) -> {-# SCC "getMergeSubscribed.a1" #-} do
832− parentSubd <- {-# SCC "getMergeSubscribed.a.parentSubd" #-} subscribe e $ WeakSubscriberMerge k ws
833− parentOcc <- {-# SCC "getMergeSubscribed.a.parentOcc" #-} liftIO $ getEventSubscribedOcc parentSubd
834− height <- {-# SCC "getMergeSubscribed.a.height" #-} liftIO $ readIORef $ eventSubscribedHeightRef parentSubd
835− return $ {-# SCC "getMergeSubscribed.a.returnVal" #-} (unsafeCoerce s :: Any, fmap (k :=>) parentOcc, height, WrapArg k :=> parentSubd)
836− let dm = DMap.fromDistinctAscList $ catMaybes $ map (\(_, x, _, _) -> x) subscribers
837− subscriberHeights = map (\(_, _, x, _) -> x) subscribers
839− if any (==invalidHeight) subscriberHeights --TODO: Replace 'any' with invalidHeight-preserving 'maximum'
841− else succ $ Prelude.maximum subscriberHeights -- This is safe because the DMap will never be empty here
842− currentHeight <- getCurrentHeight
843− let (occ, accum) = if currentHeight >= myHeight -- If we should have fired by now
844− then (if DMap.null dm then Nothing else Just dm, DMap.empty)
846− when (not $ DMap.null accum) $ do
847− scheduleMerge myHeight subscribedUnsafe
848− occRef <- liftIO $ newIORef occ
849− when (isJust occ) $ scheduleClear occRef
850− accumRef <- liftIO $ newIORef accum
851− heightRef <- liftIO $ newIORef myHeight
852− subsRef <- liftIO $ newIORef []
853− let subscribed = MergeSubscribed
854− { mergeSubscribedOccurrence = occRef
855− , mergeSubscribedAccum = accumRef
856− , mergeSubscribedHeight = heightRef
857− , mergeSubscribedSubscribers = subsRef
858− , mergeSubscribedSelf = unsafeCoerce $ map (\(x, _, _, _) -> x) subscribers --TODO: Does lack of strictness make this leak?
859− , mergeSubscribedParents = DMap.fromDistinctAscList $ map (\(_, _, _, x) -> x) subscribers
861− , mergeSubscribedNodeId = unsafeNodeId m
864− liftIO $ writeIORef subscribedRef subscribed
866− where emptyMergeSubscribed = do --TODO: This should never happen
867− occRef <- liftIO $ newIORef Nothing
868− accumRef <- liftIO $ newIORef DMap.empty
869− subsRef <- liftIO $ newIORef []
870− return $ MergeSubscribed
871− { mergeSubscribedOccurrence = occRef
872− , mergeSubscribedAccum = accumRef
873− , mergeSubscribedHeight = zeroRef
874− , mergeSubscribedSubscribers = subsRef --TODO: This will definitely leak
875− , mergeSubscribedSelf = unsafeCoerce ()
876− , mergeSubscribedParents = DMap.empty
878− , mergeSubscribedNodeId = -1
882−getFanSubscribed :: GCompare k => Fan k -> EventM (FanSubscribed k)
883−getFanSubscribed f = do
884− mSubscribed <- liftIO $ readIORef $ fanSubscribed f
886− Just subscribed -> return subscribed
888− subscribedUnsafe <- liftIO $ unsafeInterleaveIO $ liftM fromJust $ readIORef $ fanSubscribed f
889− let !sub = SubscriberFan subscribedUnsafe
890− wsub <- liftIO $ mkWeakPtrWithDebug sub "SubscriberFan"
891− subd <- subscribe (fanParent f) $ WeakSubscriberSimple wsub
892− subscribersRef <- liftIO $ newIORef DMap.empty
893− let subscribed = FanSubscribed
894− { fanSubscribedParent = subd
895− , fanSubscribedSubscribers = subscribersRef
896− , fanSubscribedSelf = sub
898− , fanSubscribedNodeId = unsafeNodeId f
901− liftIO $ writeIORef (fanSubscribed f) $ Just subscribed
904−getSwitchSubscribed :: Switch a -> EventM (SwitchSubscribed a)
905−getSwitchSubscribed s = do
906− mSubscribed <- liftIO $ readIORef $ switchSubscribed s
908− Just subscribed -> return subscribed
910− subscribedRef <- liftIO $ newIORef $ error "getSwitchSubscribed: subscribed has not yet been created"
911− subscribedUnsafe <- liftIO $ unsafeInterleaveIO $ readIORef subscribedRef
912− let !i = InvalidatorSwitch subscribedUnsafe
913− !sub = SubscriberSwitch subscribedUnsafe
914− wi <- liftIO $ mkWeakPtrWithDebug i "InvalidatorSwitch"
915− wiRef <- liftIO $ newIORef wi
916− wsub <- liftIO $ mkWeakPtrWithDebug sub "SubscriberSwitch"
917− selfWeakRef <- liftIO $ newIORef wsub
918− parentsRef <- liftIO $ newIORef [] --TODO: This should be unnecessary, because it will always be filled with just the single parent behavior
919− e <- liftIO $ runBehaviorM (readBehaviorTracked (switchParent s)) $ Just (wi, parentsRef)
920− subd <- subscribe e $ WeakSubscriberSimple wsub
921− subdRef <- liftIO $ newIORef subd
922− parentOcc <- liftIO $ getEventSubscribedOcc subd
923− occRef <- liftIO $ newIORef parentOcc
924− when (isJust parentOcc) $ scheduleClear occRef
925− heightRef <- liftIO $ newIORef =<< readIORef (eventSubscribedHeightRef subd)
926− subscribersRef <- liftIO $ newIORef []
927− let subscribed = SwitchSubscribed
928− { switchSubscribedOccurrence = occRef
929− , switchSubscribedHeight = heightRef
930− , switchSubscribedSubscribers = subscribersRef
931− , switchSubscribedSelf = sub
932− , switchSubscribedSelfWeak = selfWeakRef
933− , switchSubscribedOwnInvalidator = i
934− , switchSubscribedOwnWeakInvalidator = wiRef
935− , switchSubscribedBehaviorParents = parentsRef
936− , switchSubscribedParent = switchParent s
937− , switchSubscribedCurrentParent = subdRef
939− , switchSubscribedNodeId = unsafeNodeId s
942− liftIO $ writeIORef subscribedRef subscribed
943− liftIO $ writeIORef (switchSubscribed s) $ Just subscribed
946−getCoincidenceSubscribed :: forall a. Coincidence a -> EventM (CoincidenceSubscribed a)
947−getCoincidenceSubscribed c = do
948− mSubscribed <- liftIO $ readIORef $ coincidenceSubscribed c
950− Just subscribed -> return subscribed
952− subscribedRef <- liftIO $ newIORef $ error "getCoincidenceSubscribed: subscribed has not yet been created"
953− subscribedUnsafe <- liftIO $ unsafeInterleaveIO $ readIORef subscribedRef
954− let !subOuter = SubscriberCoincidenceOuter subscribedUnsafe
955− wsubOuter <- liftIO $ mkWeakPtrWithDebug subOuter "subOuter"
956− outerSubd <- subscribe (coincidenceParent c) $ WeakSubscriberSimple wsubOuter
957− outerOcc <- liftIO $ getEventSubscribedOcc outerSubd
958− outerHeight <- liftIO $ readIORef $ eventSubscribedHeightRef outerSubd
959− (occ, height, mInnerSubd) <- case outerOcc of
960− Nothing -> return (Nothing, outerHeight, Nothing)
962− (occ, height, innerSubd) <- subscribeCoincidenceInner o outerHeight subscribedUnsafe
963− return (occ, height, Just innerSubd)
964− occRef <- liftIO $ newIORef occ
965− when (isJust occ) $ scheduleClear occRef
966− heightRef <- liftIO $ newIORef height
967− innerSubdRef <- liftIO $ newIORef mInnerSubd
968− scheduleClear innerSubdRef
969− subscribersRef <- liftIO $ newIORef []
970− let subscribed = CoincidenceSubscribed
971− { coincidenceSubscribedOccurrence = occRef
972− , coincidenceSubscribedHeight = heightRef
973− , coincidenceSubscribedSubscribers = subscribersRef
974− , coincidenceSubscribedOuter = subOuter
975− , coincidenceSubscribedOuterParent = outerSubd
976− , coincidenceSubscribedInnerParent = innerSubdRef
978− , coincidenceSubscribedNodeId = unsafeNodeId c
981− liftIO $ writeIORef subscribedRef subscribed
982− liftIO $ writeIORef (coincidenceSubscribed c) $ Just subscribed
985−merge :: GCompare k => DMap (WrapArg Event k) -> Event (DMap k)
986−merge m = EventMerge $ Merge
988− , mergeSubscribed = unsafeNewIORef m Nothing
991−newtype EventSelector k = EventSelector { select :: forall a. k a -> Event a }
993−fan :: GCompare k => Event (DMap k) -> EventSelector k
997− , fanSubscribed = unsafeNewIORef e Nothing
999− in EventSelector $ \k -> EventFan k f
1001−-- | Run an event action outside of a frame
1002−runFrame :: EventM a -> IO a
1004− toAssignRef <- newIORef [] -- This should only actually get used when events are firing
1005− holdInitRef <- newIORef []
1006− heightRef <- newIORef 0
1007− toClearRef <- newIORef []
1008− coincidenceInfosRef <- newIORef []
1009− delayedRef <- liftIO $ newIORef IntMap.empty
1010− result <- flip runEventM (EventEnv toAssignRef holdInitRef toClearRef heightRef coincidenceInfosRef delayedRef) $ do
1012− let runHoldInits = do
1013− holdInits <- liftIO $ readIORef holdInitRef
1014− if null holdInits then return () else do
1015− liftIO $ writeIORef holdInitRef []
1016− forM_ holdInits $ \(SomeHoldInit e h) -> subscribeHold e h
1018− runHoldInits -- This must happen before doing the assignments, in case subscribing a Hold causes existing Holds to be read by the newly-propagated events
1020− toClear <- readIORef toClearRef
1021− forM_ toClear $ \(SomeMaybeIORef ref) -> writeIORef ref Nothing
1022− toAssign <- readIORef toAssignRef
1023− toReconnectRef <- newIORef []
1024− forM_ toAssign $ \(SomeAssignment h v) -> do
1025− writeIORef (holdValue h) v
1026− writeIORef (holdInvalidators h) =<< invalidate toReconnectRef =<< readIORef (holdInvalidators h)
1027− coincidenceInfos <- readIORef coincidenceInfosRef
1028− forM_ coincidenceInfos $ \(SomeCoincidenceInfo wsubInner subInner mcs) -> do
1031− mapM_ invalidateCoincidenceHeight mcs
1032− toReconnect <- readIORef toReconnectRef
1033− forM_ toReconnect $ \(SomeSwitchSubscribed subscribed) -> do
1034− wsub <- readIORef $ switchSubscribedSelfWeak subscribed
1036− wi <- readIORef $ switchSubscribedOwnWeakInvalidator subscribed
1038− let !i = switchSubscribedOwnInvalidator subscribed
1039− wi' <- mkWeakPtrWithDebug i "wi'"
1040− writeIORef (switchSubscribedBehaviorParents subscribed) []
1041− e <- runBehaviorM (readBehaviorTracked (switchSubscribedParent subscribed)) (Just (wi', switchSubscribedBehaviorParents subscribed))
1042− --TODO: Make sure we touch the pieces of the SwitchSubscribed at the appropriate times
1043− let !sub = switchSubscribedSelf subscribed -- Must be done strictly, or the weak pointer will refer to a useless thunk
1044− wsub' <- mkWeakPtrWithDebug sub "wsub'"
1045− writeIORef (switchSubscribedSelfWeak subscribed) wsub'
1046− subd' <- runFrame $ subscribe e $ WeakSubscriberSimple wsub' --TODO: Assert that the event isn't firing --TODO: This should not loop because none of the events should be firing, but still, it is inefficient
1048− stackTrace <- liftIO $ liftM renderStack $ ccsToStrings =<< (getCCSOf $! switchSubscribedParent subscribed)
1049− liftIO $ putStrLn $ (++stackTrace) $ "subd' subscribed to " ++ case e of
1050− EventRoot _ -> "EventRoot"
1051− EventNever -> "EventNever"
1052− _ -> "something else"
1054− writeIORef (switchSubscribedCurrentParent subscribed) subd'
1055− parentHeight <- readIORef $ eventSubscribedHeightRef subd'
1056− myHeight <- readIORef $ switchSubscribedHeight subscribed
1057− if parentHeight == myHeight then return () else do
1058− writeIORef (switchSubscribedHeight subscribed) parentHeight
1059− mapM_ invalidateSubscriberHeight =<< readIORef (switchSubscribedSubscribers subscribed)
1060− forM_ coincidenceInfos $ \(SomeCoincidenceInfo _ _ mcs) -> mapM_ recalculateCoincidenceHeight mcs
1061− forM_ toReconnect $ \(SomeSwitchSubscribed subscribed) -> do
1062− mapM_ recalculateSubscriberHeight =<< readIORef (switchSubscribedSubscribers subscribed)
1065−invalidHeight :: Int
1066−invalidHeight = -1000
1068−invalidateSubscriberHeight :: WeakSubscriber a -> IO ()
1069−invalidateSubscriberHeight ws = do
1070− ms <- deRefWeakSubscriber ws
1072− Nothing -> return () --TODO: cleanup?
1073− Just s -> case s of
1074− SubscriberPush _ subscribed -> do
1075− when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberPush" <> showNodeId subscribed
1076− mapM_ invalidateSubscriberHeight =<< readIORef (pushSubscribedSubscribers subscribed)
1077− when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberPush" <> showNodeId subscribed <> " done"
1078− SubscriberMerge _ subscribed -> do
1079− when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberMerge" <> showNodeId subscribed
1080− oldHeight <- readIORef $ mergeSubscribedHeight subscribed
1081− when (oldHeight /= invalidHeight) $ do
1082− writeIORef (mergeSubscribedHeight subscribed) $ invalidHeight
1083− mapM_ invalidateSubscriberHeight =<< readIORef (mergeSubscribedSubscribers subscribed)
1084− when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberMerge" <> showNodeId subscribed <> " done"
1085− SubscriberFan subscribed -> do
1086− when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberFan" <> showNodeId subscribed
1087− subscribers <- readIORef $ fanSubscribedSubscribers subscribed
1088− forM_ (DMap.toList subscribers) $ ((\(FanSubscriberKey _ :=> v) -> mapM_ invalidateSubscriberHeight v) :: DSum (FanSubscriberKey k) -> IO ())
1089− when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberFan" <> showNodeId subscribed <> " done"
1090− SubscriberHold _ -> return ()
1091− SubscriberSwitch subscribed -> do
1092− when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberSwitch" <> showNodeId subscribed
1093− oldHeight <- readIORef $ switchSubscribedHeight subscribed
1094− when (oldHeight /= invalidHeight) $ do
1095− writeIORef (switchSubscribedHeight subscribed) $ invalidHeight
1096− mapM_ invalidateSubscriberHeight =<< readIORef (switchSubscribedSubscribers subscribed)
1097− when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberSwitch" <> showNodeId subscribed <> " done"
1098− SubscriberCoincidenceOuter subscribed -> do
1099− when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberCoincidenceOuter" <> showNodeId subscribed
1100− invalidateCoincidenceHeight subscribed
1101− when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberCoincidenceOuter" <> showNodeId subscribed <> " done"
1102− SubscriberCoincidenceInner subscribed -> do
1103− when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberCoincidenceInner" <> showNodeId subscribed
1104− invalidateCoincidenceHeight subscribed
1105− when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberCoincidenceInner" <> showNodeId subscribed <> " done"
1107−invalidateCoincidenceHeight :: CoincidenceSubscribed a -> IO ()
1108−invalidateCoincidenceHeight subscribed = do
1109− oldHeight <- readIORef $ coincidenceSubscribedHeight subscribed
1110− when (oldHeight /= invalidHeight) $ do
1111− writeIORef (coincidenceSubscribedHeight subscribed) $ invalidHeight
1112− mapM_ invalidateSubscriberHeight =<< readIORef (coincidenceSubscribedSubscribers subscribed)
1114−--TODO: The recalculation algorithm seems a bit funky; make sure it doesn't miss stuff or hit stuff twice; also, it should probably be lazy
1116−recalculateSubscriberHeight :: WeakSubscriber a -> IO ()
1117−recalculateSubscriberHeight ws = do
1118− ms <- deRefWeakSubscriber ws
1120− Nothing -> return () --TODO: cleanup?
1121− Just s -> case s of
1122− SubscriberPush _ subscribed -> do
1123− when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberPush" <> showNodeId subscribed
1124− mapM_ recalculateSubscriberHeight =<< readIORef (pushSubscribedSubscribers subscribed)
1125− when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberPush" <> showNodeId subscribed <> " done"
1126− SubscriberMerge _ subscribed -> do
1127− when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberMerge" <> showNodeId subscribed
1128− oldHeight <- readIORef $ mergeSubscribedHeight subscribed
1129− when (oldHeight == invalidHeight) $ do
1130− height <- calculateMergeHeight subscribed
1131− when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: height: " <> show height
1132− when (height /= invalidHeight) $ do -- If height == invalidHeight, that means some of the prereqs have not yet been recomputed; when they do recompute, they'll catch this node again --TODO: this is O(n*m), where n is the number of children of this noe and m is the number that have been invalidated
1133− writeIORef (mergeSubscribedHeight subscribed) height
1134− mapM_ recalculateSubscriberHeight =<< readIORef (mergeSubscribedSubscribers subscribed)
1135− when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberMerge" <> showNodeId subscribed <> " done"
1136− SubscriberFan subscribed -> do
1137− when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberFan" <> showNodeId subscribed
1138− subscribers <- readIORef $ fanSubscribedSubscribers subscribed
1139− forM_ (DMap.toList subscribers) $ ((\(FanSubscriberKey _ :=> v) -> mapM_ recalculateSubscriberHeight v) :: DSum (FanSubscriberKey k) -> IO ())
1140− when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberFan" <> showNodeId subscribed <> " done"
1141− SubscriberHold _ -> return ()
1142− SubscriberSwitch subscribed -> do
1143− when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberSwitch" <> showNodeId subscribed
1144− oldHeight <- readIORef $ switchSubscribedHeight subscribed
1145− when (oldHeight == invalidHeight) $ do
1146− height <- calculateSwitchHeight subscribed
1147− when (height /= invalidHeight) $ do
1148− writeIORef (switchSubscribedHeight subscribed) height
1149− mapM_ recalculateSubscriberHeight =<< readIORef (switchSubscribedSubscribers subscribed)
1150− when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberSwitch" <> showNodeId subscribed <> " done"
1151− SubscriberCoincidenceOuter subscribed -> do
1152− when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberCoincidenceOuter" <> showNodeId subscribed
1153− void $ recalculateCoincidenceHeight subscribed
1154− when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberCoincidenceOuter" <> showNodeId subscribed <> " done"
1155− SubscriberCoincidenceInner subscribed -> do
1156− when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberCoincidenceInner" <> showNodeId subscribed
1157− void $ recalculateCoincidenceHeight subscribed
1158− when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberCoincidenceInner" <> showNodeId subscribed <> " done"
1160−recalculateCoincidenceHeight :: CoincidenceSubscribed a -> IO ()
1161−recalculateCoincidenceHeight subscribed = do
1162− oldHeight <- readIORef $ coincidenceSubscribedHeight subscribed
1163− when (oldHeight == invalidHeight) $ do
1164− height <- calculateCoincidenceHeight subscribed
1165− when (height /= invalidHeight) $ do
1166− writeIORef (coincidenceSubscribedHeight subscribed) height
1167− mapM_ recalculateSubscriberHeight =<< readIORef (coincidenceSubscribedSubscribers subscribed) --TODO: This should probably be mandatory, just like with the merge and switch ones
1169−calculateMergeHeight :: MergeSubscribed k -> IO Int
1170−calculateMergeHeight subscribed = if DMap.null (mergeSubscribedParents subscribed) then return 0 else do
1171− heights <- forM (DMap.toList $ mergeSubscribedParents subscribed) $ \(WrapArg _ :=> es) -> do
1172− readIORef $ eventSubscribedHeightRef es
1173− return $ if any (== invalidHeight) heights then invalidHeight else succ $ Prelude.maximum heights --TODO: Replace 'any' with invalidHeight-preserving 'maximum'
1175−calculateSwitchHeight :: SwitchSubscribed a -> IO Int
1176−calculateSwitchHeight subscribed = readIORef . eventSubscribedHeightRef =<< readIORef (switchSubscribedCurrentParent subscribed)
1178−calculateCoincidenceHeight :: CoincidenceSubscribed a -> IO Int
1179−calculateCoincidenceHeight subscribed = do
1180− outerHeight <- readIORef $ eventSubscribedHeightRef $ coincidenceSubscribedOuterParent subscribed
1181− innerHeight <- maybe (return 0) (readIORef . eventSubscribedHeightRef) =<< readIORef (coincidenceSubscribedInnerParent subscribed)
1182− return $ if outerHeight == invalidHeight || innerHeight == invalidHeight then invalidHeight else max outerHeight innerHeight
1185−recalculateEventSubscribedHeight :: EventSubscribed a -> IO Int
1186−recalculateEventSubscribedHeight es = case es of
1187− EventSubscribedRoot _ -> return 0
1188− EventSubscribedNever -> return 0
1189− EventSubscribedPush subscribed -> recalculateEventSubscribedHeight $ pushSubscribedParent subscribed
1190− EventSubscribedMerge subscribed -> do
1191− oldHeight <- readIORef $ mergeSubscribedHeight subscribed
1192− if oldHeight /= invalidHeight then return oldHeight else do
1193− height <- calculateMergeHeight subscribed
1194− writeIORef (mergeSubscribedHeight subscribed) height
1196− EventSubscribedFan _ subscribed -> recalculateEventSubscribedHeight $ fanSubscribedParent subscribed
1197− EventSubscribedSwitch subscribed -> do
1198− oldHeight <- readIORef $ switchSubscribedHeight subscribed
1199− if oldHeight /= invalidHeight then return oldHeight else do
1200− height <- calculateSwitchHeight subscribed
1201− writeIORef (switchSubscribedHeight subscribed) height
1203− EventSubscribedCoincidence subscribed -> recalculateCoincidenceHeight subscribed
1206−data SomeSwitchSubscribed = forall a. SomeSwitchSubscribed (SwitchSubscribed a)
1208−debugInvalidate :: Bool
1209−debugInvalidate = False
1211−invalidate :: IORef [SomeSwitchSubscribed] -> WeakList Invalidator -> IO (WeakList Invalidator)
1212−invalidate toReconnectRef wis = do
1213− forM_ wis $ \wi -> do
1217− when debugInvalidate $ liftIO $ putStrLn "invalidate Dead"
1218− return () --TODO: Should we clean this up here?
1220− finalize wi -- Once something's invalidated, it doesn't need to hang around; this will change when some things are strict
1222− InvalidatorPull p -> do
1223− when debugInvalidate $ liftIO $ putStrLn "invalidate Pull"
1224− mVal <- readIORef $ pullValue p
1225− forM_ mVal $ \val -> do
1226− writeIORef (pullValue p) Nothing
1227− writeIORef (pullSubscribedInvalidators val) =<< invalidate toReconnectRef =<< readIORef (pullSubscribedInvalidators val)
1228− InvalidatorSwitch subscribed -> do
1229− when debugInvalidate $ liftIO $ putStrLn "invalidate Switch"
1230− modifyIORef' toReconnectRef (SomeSwitchSubscribed subscribed :)
1231− 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
1233−--------------------------------------------------------------------------------
1234−-- Reflex integration
1235−--------------------------------------------------------------------------------
1239−instance R.Reflex Spider where
1240− newtype Behavior Spider a = SpiderBehavior { unSpiderBehavior :: Behavior a }
1241− newtype Event Spider a = SpiderEvent { unSpiderEvent :: Event a }
1242− type PullM Spider = BehaviorM
1243− type PushM Spider = EventM
1244− {-# INLINE never #-}
1245− {-# INLINE constant #-}
1246− never = SpiderEvent EventNever
1247− constant = SpiderBehavior . BehaviorConst
1248− push f = SpiderEvent. push f . unSpiderEvent
1249− pull = SpiderBehavior . pull
1250− merge = SpiderEvent . merge . (unsafeCoerce :: DMap (WrapArg (R.Event Spider) k) -> DMap (WrapArg Event k))
1251− fan e = R.EventSelector $ SpiderEvent . select (fan (unSpiderEvent e))
1252− switch = SpiderEvent . switch . (unsafeCoerce :: Behavior (R.Event Spider a) -> Behavior (Event a)) . unSpiderBehavior
1253− coincidence = SpiderEvent . coincidence . (unsafeCoerce :: Event (R.Event Spider a) -> Event (Event a)) . unSpiderEvent
1255−instance R.MonadSample Spider SpiderHost where
1256− {-# INLINE sample #-}
1257− sample = SpiderHost . readBehavior . unSpiderBehavior
1259−instance R.MonadHold Spider SpiderHost where
1260− hold v0 = SpiderHost . liftM SpiderBehavior . runFrame . hold v0 . unSpiderEvent
1262−instance R.MonadSample Spider BehaviorM where
1263− {-# INLINE sample #-}
1264− sample = readBehaviorTracked . unSpiderBehavior
1266−instance R.MonadSample Spider EventM where
1267− {-# INLINE sample #-}
1268− sample = liftIO . readBehavior . unSpiderBehavior
1270−instance R.MonadHold Spider EventM where
1271− {-# INLINE hold #-}
1272− hold v0 e = SpiderBehavior <$> hold v0 (unSpiderEvent e)
1274−newtype RootTrigger a = RootTrigger (IORef [WeakSubscriber a], IORef (Maybe a))
1276−instance R.ReflexHost Spider where
1277− type EventTrigger Spider = RootTrigger
1278− type EventHandle Spider = R.Event Spider
1279− type HostFrame Spider = SpiderHostFrame
1281−instance R.MonadReadEvent Spider ResultM where
1282− {-# INLINE readEvent #-}
1283− readEvent = liftM (fmap return) . readEvent . unSpiderEvent
1285−instance MonadRef EventM where
1286− type Ref EventM = Ref IO
1287− {-# INLINE newRef #-}
1288− {-# INLINE readRef #-}
1289− {-# INLINE writeRef #-}
1290− {-# INLINE atomicModifyRef #-}
1291− newRef = liftIO . newRef
1292− readRef = liftIO . readRef
1293− writeRef r a = liftIO $ writeRef r a
1294− atomicModifyRef r f = liftIO $ atomicModifyRef r f
1296−newtype SpiderHost a = SpiderHost { runSpiderHost :: IO a } deriving (Functor, Applicative, Monad, MonadFix, MonadIO)
1298−newtype SpiderHostFrame a = SpiderHostFrame { runSpiderHostFrame :: EventM a } deriving (Functor, Applicative, Monad, MonadFix, MonadIO)
1300−instance R.MonadSample Spider SpiderHostFrame where
1301− sample = SpiderHostFrame . R.sample --TODO: This can cause problems with laziness, so we should get rid of it if we can
1303−instance R.MonadHold Spider SpiderHostFrame where
1304− {-# INLINE hold #-}
1305− hold v0 e = SpiderHostFrame $ R.hold v0 e
1307−newEventWithTriggerIO :: (RootTrigger a -> IO (IO ())) -> IO (R.Event Spider a)
1308−newEventWithTriggerIO f = do
1309− occRef <- newIORef Nothing
1310− subscribedRef <- newIORef Nothing
1312− { rootOccurrence = occRef
1313− , rootSubscribed = subscribedRef
1316− return $ SpiderEvent $ EventRoot r
1318−instance R.MonadReflexCreateTrigger Spider SpiderHost where
1319− newEventWithTrigger = SpiderHost . newEventWithTriggerIO
1321−instance R.MonadReflexCreateTrigger Spider SpiderHostFrame where
1322− newEventWithTrigger = SpiderHostFrame . EventM . liftIO . newEventWithTriggerIO
1324−instance R.MonadReflexHost Spider SpiderHost where
1325− fireEventsAndRead es a = SpiderHost $ run es a
1326− subscribeEvent e = SpiderHost $ do
1327− _ <- runFrame $ getEventSubscribed $ unSpiderEvent e --TODO: The result of this should actually be used
1329− runFrame = SpiderHost . runFrame
1330− runHostFrame = SpiderHost . runFrame . runSpiderHostFrame
1332−instance MonadRef SpiderHost where
1333− type Ref SpiderHost = Ref IO
1334− newRef = SpiderHost . newRef
1335− readRef = SpiderHost . readRef
1336− writeRef r = SpiderHost . writeRef r
1337− atomicModifyRef r = SpiderHost . atomicModifyRef r
1339−instance MonadRef SpiderHostFrame where
1340− type Ref SpiderHostFrame = Ref IO
1341− newRef = SpiderHostFrame . newRef
1342− readRef = SpiderHostFrame . readRef
1343− writeRef r = SpiderHostFrame . writeRef r
1344− atomicModifyRef r = SpiderHostFrame . atomicModifyRef r