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1+{-# LANGUAGE BangPatterns #-}
3+{-# LANGUAGE ConstraintKinds #-}
4+{-# LANGUAGE EmptyDataDecls #-}
5+{-# LANGUAGE FlexibleContexts #-}
6+{-# LANGUAGE FlexibleInstances #-}
7+{-# LANGUAGE FunctionalDependencies #-}
9+{-# LANGUAGE GeneralizedNewtypeDeriving #-}
10+{-# LANGUAGE LambdaCase #-}
11+{-# LANGUAGE MagicHash #-}
12+{-# LANGUAGE MultiParamTypeClasses #-}
13+{-# LANGUAGE MultiWayIf #-}
14+{-# LANGUAGE RankNTypes #-}
15+{-# LANGUAGE RoleAnnotations #-}
16+{-# LANGUAGE ScopedTypeVariables #-}
17+{-# LANGUAGE TypeFamilies #-}
18+{-# LANGUAGE TypeOperators #-}
19+{-# LANGUAGE UndecidableInstances #-}
20+-- | This module is the implementation of the 'Spider' 'Reflex' engine. It uses
21+-- a graph traversal algorithm to propagate 'Event's and 'Behavior's.
22+module Reflex.Spider.Internal where
24+import Control.Applicative
25+import Control.Concurrent
26+import Control.Exception
27+import Control.Monad hiding (forM, forM_, mapM, mapM_, sequence)
28+import Control.Monad.Exception
29+import Control.Monad.Identity hiding (forM, forM_, mapM, mapM_, sequence)
30+import Control.Monad.Primitive
31+import Control.Monad.Reader hiding (forM, forM_, mapM, mapM_, sequence)
32+import Control.Monad.Ref
35+import Data.Dependent.Map (DMap, DSum (..))
36+import qualified Data.Dependent.Map as DMap
37+import Data.Foldable hiding (concat, elem, sequence_)
39+import Data.Functor.Constant
40+import Data.Functor.Product
41+import Data.GADT.Compare
42+import Data.IntMap.Strict (IntMap)
43+import qualified Data.IntMap.Strict as IntMap
45+import Data.List hiding (foldl')
47+import Data.Monoid ((<>))
49+import Data.Some (Some)
50+import qualified Data.Some as Some
52+import Data.Traversable
53+import Data.Type.Coercion
56+import GHC.IORef (IORef (..))
58+import System.IO.Unsafe
59+import System.Mem.Weak
63+import Control.Monad.State hiding (forM, forM_, mapM, mapM_, sequence)
64+import Data.List.NonEmpty (NonEmpty (..), nonEmpty)
65+import qualified Data.List.NonEmpty as NonEmpty
66+import Data.Monoid (mempty)
67+import Data.Tree (Forest, Tree (..), drawForest)
70+import Data.WeakBag (WeakBag, WeakBagTicket)
71+import qualified Data.WeakBag as WeakBag
72+import qualified Reflex.Class as R
73+import qualified Reflex.Host.Class as R
75+-- Note: must come last to silence warnings due to AMP on GHC < 7.10
76+import Prelude hiding (any, concat, mapM, mapM_, sequence)
78+debugPropagate :: Bool
80+debugInvalidateHeight :: Bool
82+debugInvalidate :: Bool
90+debugInvalidateHeight = False
92+debugInvalidate = True
94+class HasNodeId a where
95+ getNodeId :: a -> Int
97+instance HasNodeId (Hold x p a) where
98+ getNodeId = holdNodeId
100+instance HasNodeId (PushSubscribed x a b) where
101+ getNodeId = pushSubscribedNodeId
103+instance HasNodeId (SwitchSubscribed x a) where
104+ getNodeId = switchSubscribedNodeId
106+instance HasNodeId (FanSubscribed x a) where
107+ getNodeId = fanSubscribedNodeId
109+instance HasNodeId (CoincidenceSubscribed x a) where
110+ getNodeId = coincidenceSubscribedNodeId
112+instance HasNodeId (RootSubscribed x a) where
113+ getNodeId = rootSubscribedNodeId
115+instance HasNodeId (Pull x a) where
116+ getNodeId = pullNodeId
118+{-# INLINE showNodeId #-}
119+showNodeId :: HasNodeId a => a -> String
120+showNodeId = ("#"<>) . show . getNodeId
122+showSubscriberType :: Subscriber x a -> String
123+showSubscriberType = \case
124+ SubscriberPush _ _ -> "SubscriberPush"
125+ SubscriberMerge _ _ -> "SubscriberMerge"
126+ SubscriberFan _ -> "SubscriberFan"
127+ SubscriberMergeChange _ -> "SubscriberMergeChange"
128+ SubscriberHold _ -> "SubscriberHold"
129+ SubscriberHoldIdentity _ -> "SubscriberHoldIdentity"
130+ SubscriberSwitch _ -> "SubscriberSwitch"
131+ SubscriberCoincidenceOuter _ -> "SubscriberCoincidenceOuter"
132+ SubscriberCoincidenceInner _ -> "SubscriberCoincidenceInner"
133+ SubscriberHandle -> "SubscriberHandle"
135+showEventType :: Event x a -> String
136+showEventType = \case
137+ EventRoot _ _ -> "EventRoot"
138+ EventNever -> "EventNever"
139+ EventPush _ -> "EventPush"
140+ EventMerge _ -> "EventMerge"
141+ EventFan _ _ -> "EventFan"
142+ EventSwitch _ -> "EventSwitch"
143+ EventCoincidence _ -> "EventCoincidence"
144+ EventHold _ -> "EventHold"
145+ EventDyn _ -> "EventDyn"
146+ EventHoldIdentity _ -> "EventHoldIdentity"
147+ EventDynIdentity _ -> "EventDynIdentity"
151+debugPropagate = False
153+debugInvalidateHeight = False
155+debugInvalidate = False
157+-- This must be inline, or error messages will cause memory leaks due to retaining the node in question
158+{-# INLINE showNodeId #-}
159+showNodeId :: a -> String
165+{-# NOINLINE nextNodeIdRef #-}
166+nextNodeIdRef :: IORef Int
167+nextNodeIdRef = unsafePerformIO $ newIORef 1
170+newNodeId = atomicModifyIORef' nextNodeIdRef $ \n -> (succ n, n)
172+{-# NOINLINE unsafeNodeId #-}
173+unsafeNodeId :: a -> Int
174+unsafeNodeId a = unsafePerformIO $ do
179+--------------------------------------------------------------------------------
181+--------------------------------------------------------------------------------
183+newtype Event x a = Event { subscribeAndRead :: Subscriber x a -> EventM x (EventSubscription x, Maybe a) }
185+-- | Construct an 'Event' equivalent to that constructed by 'push', but with no
186+-- caching; if the computation function is very cheap, this is (much) more
187+-- efficient than 'push'
188+{-# INLINABLE pushCheap #-}
189+pushCheap :: HasSpiderTimeline x => (a -> ComputeM x (Maybe b)) -> Event x a -> Event x b
190+pushCheap f e = Event $ \sub -> do
191+ (subscription, occ) <- subscribeAndRead e $ sub
192+ { subscriberPropagate = \a -> do
193+ mb <- runComputeM $ f a
194+ mapM_ (subscriberPropagate sub) mb
196+ occ' <- join <$> mapM (runComputeM . f) occ
197+ return (subscription, occ')
199+data CacheSubscribed x a
200+ = CacheSubscribed { _cacheSubscribed_subscribers :: {-# UNPACK #-} !(WeakBag (Subscriber x a))
201+ , _cacheSubscribed_weakSelf :: {-# UNPACK #-} !(IORef (Weak (CacheSubscribed x a)))
202+ , _cacheSubscribed_parent :: {-# UNPACK #-} !(EventSubscription x)
203+ , _cacheSubscribed_cached :: {-# UNPACK #-} !(IORef (Maybe (CacheSubscribed x a)))
204+ , _cacheSubscribed_occurrence :: {-# UNPACK #-} !(IORef (Maybe a))
207+-- | Construct an 'Event' whose value is guaranteed not to be recomputed
210+--TODO: Try a caching strategy where we subscribe directly to the parent when
211+--there's only one subscriber, and then build our own WeakBag only when a second
213+{-# INLINABLE cacheEvent #-}
214+cacheEvent :: HasSpiderTimeline x => Event x a -> Event x a
215+cacheEvent e = Event $ \sub -> {-# SCC "cacheEvent" #-} do
216+ let !mSubscribedRef = unsafeNewIORef e Nothing
217+ mSubscribed <- liftIO $ readIORef mSubscribedRef
219+ Just subscribed -> liftIO $ do
220+ ticket <- WeakBag.insert sub (_cacheSubscribed_subscribers subscribed) (_cacheSubscribed_weakSelf subscribed) cleanupCacheSubscribed
221+ occ <- readIORef $ _cacheSubscribed_occurrence subscribed
222+ let es = EventSubscribed
223+ { eventSubscribedHeightRef = eventSubscribedHeightRef $ _eventSubscription_subscribed $ _cacheSubscribed_parent subscribed
224+ , eventSubscribedRetained = toAny subscribed
226+ return (EventSubscription (WeakBag.remove ticket >> touch ticket) es, occ)
228+ weakSelf <- liftIO $ newIORef $ error "cacheEvent: weakSelf not yet intialized"
229+ (subscribers, ticket) <- liftIO $ WeakBag.singleton sub weakSelf cleanupCacheSubscribed
230+ occRef <- liftIO $ newIORef undefined
231+ (parentSub, occ) <- subscribeAndRead e $ Subscriber
232+ { subscriberPropagate = \a -> do
233+ liftIO $ writeIORef occRef $ Just a
234+ scheduleClear occRef
235+ propagate a subscribers
236+ , subscriberInvalidateHeight = \old -> do
237+ WeakBag.traverse subscribers $ invalidateSubscriberHeight old
238+ , subscriberRecalculateHeight = \new -> do
239+ WeakBag.traverse subscribers $ recalculateSubscriberHeight new
241+ liftIO $ writeIORef occRef occ
242+ when (isJust occ) $ scheduleClear occRef
243+ let !subscribed = CacheSubscribed
244+ { _cacheSubscribed_subscribers = subscribers
245+ , _cacheSubscribed_weakSelf = weakSelf
246+ , _cacheSubscribed_parent = parentSub
247+ , _cacheSubscribed_cached = mSubscribedRef
248+ , _cacheSubscribed_occurrence = occRef
250+ liftIO $ writeIORef mSubscribedRef $ Just subscribed
251+ liftIO $ writeIORef weakSelf =<< evaluate =<< mkWeakPtrWithDebug subscribed "PushSubscribed"
252+ return (EventSubscription (WeakBag.remove ticket >> touch ticket) (EventSubscribed (eventSubscribedHeightRef $ _eventSubscription_subscribed parentSub) (toAny subscribed)), occ)
254+cleanupCacheSubscribed :: CacheSubscribed x a -> IO ()
255+cleanupCacheSubscribed self = do
256+ unsubscribe $ _cacheSubscribed_parent self
257+ writeIORef (_cacheSubscribed_cached self) Nothing
259+subscribe :: Event x a -> Subscriber x a -> EventM x (EventSubscription x)
260+subscribe e s = fst <$> subscribeAndRead e s
263+wrap :: MonadIO m => (t -> EventSubscribed x) -> (Subscriber x a -> m (WeakBagTicket, t, Maybe a)) -> Subscriber x a -> m (EventSubscription x, Maybe a)
264+wrap tag getSpecificSubscribed sub = do
265+ (sln, subd, occ) <- getSpecificSubscribed sub
267+ return (EventSubscription (WeakBag.remove sln >> touch sln) es, occ)
269+eventRoot :: GCompare k => k a -> Root x k -> Event x a
270+eventRoot !k !r = Event $ wrap eventSubscribedRoot $ liftIO . getRootSubscribed k r
272+eventNever :: Event x a
273+eventNever = Event $ \_ -> return (EventSubscription (return ()) eventSubscribedNever, Nothing)
275+eventFan :: (GCompare k, HasSpiderTimeline x) => k a -> Fan x k -> Event x a
276+eventFan !k !f = Event $ wrap eventSubscribedFan $ getFanSubscribed k f
278+eventSwitch :: HasSpiderTimeline x => Switch x a -> Event x a
279+eventSwitch !s = Event $ wrap eventSubscribedSwitch $ getSwitchSubscribed s
281+eventCoincidence :: HasSpiderTimeline x => Coincidence x a -> Event x a
282+eventCoincidence !c = Event $ wrap eventSubscribedCoincidence $ getCoincidenceSubscribed c
284+eventHold :: HasSpiderTimeline x => Hold x p -> Event x p
285+eventHold !h = Event $ subscribeHoldEvent h
287+eventDyn :: (HasSpiderTimeline x, R.Patch p) => Dyn x p -> Event x p
288+eventDyn !j = Event $ \sub -> getDynHold j >>= \h -> subscribeHoldEvent h sub
290+{-# INLINE subscribeCoincidenceInner #-}
291+subscribeCoincidenceInner :: CanSubscribe x m => Event x a -> Height -> CoincidenceSubscribed x a -> m (Maybe a, Height, EventSubscribed x)
292+subscribeCoincidenceInner inner outerHeight subscribedUnsafe = do
293+ subInner <- liftIO $ newSubscriberCoincidenceInner subscribedUnsafe
294+ (subscription@(EventSubscription _ innerSubd), innerOcc) <- subscribeAndRead inner subInner
295+ innerHeight <- liftIO $ getEventSubscribedHeight innerSubd
296+ let height = max innerHeight outerHeight
297+ defer $ SomeResetCoincidence subscription $ if height > outerHeight then Just subscribedUnsafe else Nothing
298+ return (innerOcc, height, innerSubd)
300+--------------------------------------------------------------------------------
302+--------------------------------------------------------------------------------
304+data Subscriber x a = Subscriber
305+ { subscriberPropagate :: !(a -> EventM x ())
306+ , subscriberInvalidateHeight :: !(Height -> IO ())
307+ , subscriberRecalculateHeight :: !(Height -> IO ())
310+--TODO: Move this comment to WeakBag
311+-- These function are constructor functions that are marked NOINLINE so they are
312+-- opaque to GHC. If we do not do this, then GHC will sometimes fuse the constructor away
313+-- so any weak references that are attached to the constructors will have their
314+-- finalizer run. Using the opaque constructor, does not see the
315+-- constructor application, so it behaves like an IORef and cannot be fused away.
317+-- The result is also evaluated to WHNF, since forcing a thunk invalidates
318+-- the weak pointer to it in some cases.
320+newSubscriberHold :: (HasSpiderTimeline x, R.Patch p) => Hold x p -> IO (Subscriber x p)
321+newSubscriberHold h = return $ Subscriber
322+ { subscriberPropagate = {-# SCC "traverseHold" #-} propagateSubscriberHold h
323+ , subscriberInvalidateHeight = \_ -> return ()
324+ , subscriberRecalculateHeight = \_ -> return ()
327+newSubscriberFan :: forall x k. (HasSpiderTimeline x, GCompare k) => FanSubscribed x k -> IO (Subscriber x (DMap k Identity))
328+newSubscriberFan subscribed = return $ Subscriber
329+ { subscriberPropagate = \a -> {-# SCC "traverseFan" #-} do
330+ subs <- liftIO $ readIORef $ fanSubscribedSubscribers subscribed
331+ tracePropagate (Proxy :: Proxy x) $ "SubscriberFan" <> showNodeId subscribed <> ": " ++ show (DMap.size subs) ++ " keys subscribed, " ++ show (DMap.size a) ++ " keys firing"
332+ liftIO $ writeIORef (fanSubscribedOccurrence subscribed) $ Just a
333+ scheduleClear $ fanSubscribedOccurrence subscribed
334+ let f _ (Pair (Identity v) subsubs) = do
335+ propagate v $ _fanSubscribedChildren_list subsubs
336+ return $ Constant ()
337+ _ <- DMap.traverseWithKey f $ DMap.intersectionWithKey (\_ -> Pair) a subs --TODO: Would be nice to have DMap.traverse_
339+ , subscriberInvalidateHeight = \old -> do
340+ when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberFan" <> showNodeId subscribed
341+ subscribers <- readIORef $ fanSubscribedSubscribers subscribed
342+ forM_ (DMap.toList subscribers) $ \(_ :=> v) -> WeakBag.traverse (_fanSubscribedChildren_list v) $ invalidateSubscriberHeight old
343+ when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberFan" <> showNodeId subscribed <> " done"
344+ , subscriberRecalculateHeight = \new -> do
345+ when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberFan" <> showNodeId subscribed
346+ subscribers <- readIORef $ fanSubscribedSubscribers subscribed
347+ forM_ (DMap.toList subscribers) $ \(_ :=> v) -> WeakBag.traverse (_fanSubscribedChildren_list v) $ recalculateSubscriberHeight new
348+ when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberFan" <> showNodeId subscribed <> " done"
351+newSubscriberSwitch :: forall x a. HasSpiderTimeline x => SwitchSubscribed x a -> IO (Subscriber x a)
352+newSubscriberSwitch subscribed = return $ Subscriber
353+ { subscriberPropagate = \a -> {-# SCC "traverseSwitch" #-} do
354+ tracePropagate (Proxy :: Proxy x) $ "SubscriberSwitch" <> showNodeId subscribed
355+ liftIO $ writeIORef (switchSubscribedOccurrence subscribed) $ Just a
356+ scheduleClear $ switchSubscribedOccurrence subscribed
357+ propagate a $ switchSubscribedSubscribers subscribed
358+ , subscriberInvalidateHeight = \_ -> do
359+ when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberSwitch" <> showNodeId subscribed
360+ oldHeight <- readIORef $ switchSubscribedHeight subscribed
361+ when (oldHeight /= invalidHeight) $ do
362+ writeIORef (switchSubscribedHeight subscribed) $! invalidHeight
363+ WeakBag.traverse (switchSubscribedSubscribers subscribed) $ invalidateSubscriberHeight oldHeight
364+ when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberSwitch" <> showNodeId subscribed <> " done"
365+ , subscriberRecalculateHeight = \new -> do
366+ when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberSwitch" <> showNodeId subscribed
367+ updateSwitchHeight new subscribed
368+ when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberSwitch" <> showNodeId subscribed <> " done"
371+newSubscriberCoincidenceOuter :: forall x b. HasSpiderTimeline x => CoincidenceSubscribed x b -> IO (Subscriber x (Event x b))
372+newSubscriberCoincidenceOuter subscribed = return $ Subscriber
373+ { subscriberPropagate = \a -> {-# SCC "traverseCoincidenceOuter" #-} do
374+ tracePropagate (Proxy :: Proxy x) $ "SubscriberCoincidenceOuter" <> showNodeId subscribed
375+ outerHeight <- liftIO $ readIORef $ coincidenceSubscribedHeight subscribed
376+ tracePropagate (Proxy :: Proxy x) $ " outerHeight = " <> show outerHeight
377+ (occ, innerHeight, innerSubd) <- subscribeCoincidenceInner a outerHeight subscribed
378+ tracePropagate (Proxy :: Proxy x) $ " isJust occ = " <> show (isJust occ)
379+ tracePropagate (Proxy :: Proxy x) $ " innerHeight = " <> show innerHeight
380+ liftIO $ writeIORef (coincidenceSubscribedInnerParent subscribed) $ Just innerSubd
381+ scheduleClear $ coincidenceSubscribedInnerParent subscribed
384+ when (innerHeight > outerHeight) $ liftIO $ do -- If the event fires, it will fire at a later height
385+ writeIORef (coincidenceSubscribedHeight subscribed) $! innerHeight
386+ WeakBag.traverse (coincidenceSubscribedSubscribers subscribed) $ invalidateSubscriberHeight outerHeight
387+ WeakBag.traverse (coincidenceSubscribedSubscribers subscribed) $ recalculateSubscriberHeight innerHeight
388+ Just o -> do -- Since it's already firing, no need to adjust height
389+ liftIO $ writeIORef (coincidenceSubscribedOccurrence subscribed) occ
390+ scheduleClear $ coincidenceSubscribedOccurrence subscribed
391+ propagate o $ coincidenceSubscribedSubscribers subscribed
392+ , subscriberInvalidateHeight = \_ -> do
393+ when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberCoincidenceOuter" <> showNodeId subscribed
394+ invalidateCoincidenceHeight subscribed
395+ when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberCoincidenceOuter" <> showNodeId subscribed <> " done"
396+ , subscriberRecalculateHeight = \_ -> do
397+ when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberCoincidenceOuter" <> showNodeId subscribed
398+ recalculateCoincidenceHeight subscribed
399+ when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberCoincidenceOuter" <> showNodeId subscribed <> " done"
402+newSubscriberCoincidenceInner :: forall x a. HasSpiderTimeline x => CoincidenceSubscribed x a -> IO (Subscriber x a)
403+newSubscriberCoincidenceInner subscribed = return $ Subscriber
404+ { subscriberPropagate = \a -> {-# SCC "traverseCoincidenceInner" #-} do
405+ tracePropagate (Proxy :: Proxy x) $ "SubscriberCoincidenceInner" <> showNodeId subscribed
406+ occ <- liftIO $ readIORef $ coincidenceSubscribedOccurrence subscribed
408+ Just _ -> return () -- SubscriberCoincidenceOuter must have already propagated this event
410+ liftIO $ writeIORef (coincidenceSubscribedOccurrence subscribed) $ Just a
411+ scheduleClear $ coincidenceSubscribedOccurrence subscribed
412+ propagate a $ coincidenceSubscribedSubscribers subscribed
413+ , subscriberInvalidateHeight = \_ -> do
414+ when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberCoincidenceInner" <> showNodeId subscribed
415+ invalidateCoincidenceHeight subscribed
416+ when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberCoincidenceInner" <> showNodeId subscribed <> " done"
417+ , subscriberRecalculateHeight = \_ -> do
418+ when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberCoincidenceInner" <> showNodeId subscribed
419+ recalculateCoincidenceHeight subscribed
420+ when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberCoincidenceInner" <> showNodeId subscribed <> " done"
423+invalidateSubscriberHeight :: Height -> Subscriber x a -> IO ()
424+invalidateSubscriberHeight = flip subscriberInvalidateHeight
426+recalculateSubscriberHeight :: Height -> Subscriber x a -> IO ()
427+recalculateSubscriberHeight = flip subscriberRecalculateHeight
429+-- | Propagate everything at the current height
430+propagate :: a -> WeakBag (Subscriber x a) -> EventM x ()
431+propagate a subscribers = withIncreasedDepth $ do
432+ -- 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
433+ --TODO: Should we check if nodes already have their values before propagating? Maybe we're re-doing work
434+ WeakBag.traverse subscribers $ \s -> subscriberPropagate s a
436+--------------------------------------------------------------------------------
438+--------------------------------------------------------------------------------
443+data EventSubscribed x = EventSubscribed
444+ { eventSubscribedHeightRef :: {-# UNPACK #-} !(IORef Height)
445+ , eventSubscribedRetained :: {-# NOUNPACK #-} !Any
447+ , eventSubscribedGetParents :: !(IO [Some (EventSubscribed x)]) -- For debugging loops
448+ , eventSubscribedHasOwnHeightRef :: !Bool
449+ , eventSubscribedWhoCreated :: !(IO [String])
453+eventSubscribedRoot :: RootSubscribed x a -> EventSubscribed x
454+eventSubscribedRoot !r = EventSubscribed
455+ { eventSubscribedHeightRef = zeroRef
456+ , eventSubscribedRetained = toAny r
458+ , eventSubscribedGetParents = return []
459+ , eventSubscribedHasOwnHeightRef = False
460+ , eventSubscribedWhoCreated = return ["root"]
464+eventSubscribedNever :: EventSubscribed x
465+eventSubscribedNever = EventSubscribed
466+ { eventSubscribedHeightRef = zeroRef
467+ , eventSubscribedRetained = toAny ()
469+ , eventSubscribedGetParents = return []
470+ , eventSubscribedHasOwnHeightRef = False
471+ , eventSubscribedWhoCreated = return ["never"]
475+eventSubscribedFan :: FanSubscribed x k -> EventSubscribed x
476+eventSubscribedFan !subscribed = EventSubscribed
477+ { eventSubscribedHeightRef = eventSubscribedHeightRef $ _eventSubscription_subscribed $ fanSubscribedParent subscribed
478+ , eventSubscribedRetained = toAny subscribed
480+ , eventSubscribedGetParents = return [Some.This $ _eventSubscription_subscribed $ fanSubscribedParent subscribed]
481+ , eventSubscribedHasOwnHeightRef = False
482+ , eventSubscribedWhoCreated = whoCreatedIORef $ fanSubscribedCachedSubscribed subscribed
486+eventSubscribedSwitch :: SwitchSubscribed x a -> EventSubscribed x
487+eventSubscribedSwitch !subscribed = EventSubscribed
488+ { eventSubscribedHeightRef = switchSubscribedHeight subscribed
489+ , eventSubscribedRetained = toAny subscribed
491+ , eventSubscribedGetParents = do
492+ s <- readIORef $ switchSubscribedCurrentParent subscribed
493+ return [Some.This $ _eventSubscription_subscribed s]
494+ , eventSubscribedHasOwnHeightRef = True
495+ , eventSubscribedWhoCreated = whoCreatedIORef $ switchSubscribedCachedSubscribed subscribed
499+eventSubscribedCoincidence :: CoincidenceSubscribed x a -> EventSubscribed x
500+eventSubscribedCoincidence !subscribed = EventSubscribed
501+ { eventSubscribedHeightRef = coincidenceSubscribedHeight subscribed
502+ , eventSubscribedRetained = toAny subscribed
504+ , eventSubscribedGetParents = do
505+ innerSubscription <- readIORef $ coincidenceSubscribedInnerParent subscribed
506+ let outerParent = Some.This $ _eventSubscription_subscribed $ coincidenceSubscribedOuterParent subscribed
507+ innerParents = maybeToList $ fmap Some.This innerSubscription
508+ return $ outerParent : innerParents
509+ , eventSubscribedHasOwnHeightRef = True
510+ , eventSubscribedWhoCreated = whoCreatedIORef $ coincidenceSubscribedCachedSubscribed subscribed
514+getEventSubscribedHeight :: EventSubscribed x -> IO Height
515+getEventSubscribedHeight es = readIORef $ eventSubscribedHeightRef es
518+whoCreatedEventSubscribed :: EventSubscribed x -> IO [String]
519+whoCreatedEventSubscribed = eventSubscribedWhoCreated
521+walkInvalidHeightParents :: EventSubscribed x -> IO [Some (EventSubscribed x)]
522+walkInvalidHeightParents s0 = do
523+ subscribers <- flip execStateT mempty $ ($ Some.This s0) $ fix $ \loop (Some.This s) -> do
524+ h <- liftIO $ readIORef $ eventSubscribedHeightRef s
525+ when (h == invalidHeight) $ do
526+ when (eventSubscribedHasOwnHeightRef s) $ liftIO $ writeIORef (eventSubscribedHeightRef s) $! invalidHeightBeingTraversed
527+ modify (Some.This s :)
528+ mapM_ loop =<< liftIO (eventSubscribedGetParents s)
529+ forM_ subscribers $ \(Some.This s) -> writeIORef (eventSubscribedHeightRef s) $! invalidHeight
533+{-# INLINE subscribeHoldEvent #-}
534+subscribeHoldEvent :: CanSubscribe x m => Hold x p -> Subscriber x p -> m (EventSubscription x, Maybe p)
535+subscribeHoldEvent = subscribeAndRead . holdEvent
537+--------------------------------------------------------------------------------
539+--------------------------------------------------------------------------------
541+data EventSubscription x = EventSubscription
542+ { _eventSubscription_unsubscribe :: !(IO ())
543+ , _eventSubscription_subscribed :: {-# UNPACK #-} !(EventSubscribed x)
546+unsubscribe :: EventSubscription x -> IO ()
547+unsubscribe (EventSubscription u _) = u
549+--------------------------------------------------------------------------------
551+--------------------------------------------------------------------------------
553+newtype Behavior x a = Behavior { readBehaviorTracked :: BehaviorM x a }
555+behaviorHold :: Hold x p -> Behavior x (R.PatchTarget p)
556+behaviorHold !h = Behavior $ readHoldTracked h
558+behaviorHoldIdentity :: Hold x (Identity a) -> Behavior x a
559+behaviorHoldIdentity = behaviorHold
561+behaviorConst :: a -> Behavior x a
562+behaviorConst !a = Behavior $ return a
564+behaviorPull :: Pull x a -> Behavior x a
565+behaviorPull !p = Behavior $ do
566+ val <- liftIO $ readIORef $ pullValue p
568+ Just subscribed -> do
569+ askParentsRef >>= mapM_ (\r -> liftIO $ modifyIORef' r (SomeBehaviorSubscribed (BehaviorSubscribedPull subscribed) :))
570+ askInvalidator >>= mapM_ (\wi -> liftIO $ modifyIORef' (pullSubscribedInvalidators subscribed) (wi:))
571+ liftIO $ touch $ pullSubscribedOwnInvalidator subscribed
572+ return $ pullSubscribedValue subscribed
574+ i <- liftIO $ newInvalidatorPull p
575+ wi <- liftIO $ mkWeakPtrWithDebug i "InvalidatorPull"
576+ parentsRef <- liftIO $ newIORef []
577+ holdInits <- askBehaviorHoldInits
578+ a <- liftIO $ runReaderT (unBehaviorM $ pullCompute p) (Just (wi, parentsRef), holdInits)
579+ invsRef <- liftIO . newIORef . maybeToList =<< askInvalidator
580+ parents <- liftIO $ readIORef parentsRef
581+ let subscribed = PullSubscribed
582+ { pullSubscribedValue = a
583+ , pullSubscribedInvalidators = invsRef
584+ , pullSubscribedOwnInvalidator = i
585+ , pullSubscribedParents = parents
587+ liftIO $ writeIORef (pullValue p) $ Just subscribed
588+ askParentsRef >>= mapM_ (\r -> liftIO $ modifyIORef' r (SomeBehaviorSubscribed (BehaviorSubscribedPull subscribed) :))
591+behaviorDyn :: (HasSpiderTimeline x, R.Patch p) => Dyn x p -> Behavior x (R.PatchTarget p)
592+behaviorDyn !d = Behavior $ readHoldTracked =<< getDynHold d
594+{-# INLINE readHoldTracked #-}
595+readHoldTracked :: Hold x p -> BehaviorM x (R.PatchTarget p)
596+readHoldTracked h = do
597+ result <- liftIO $ readIORef $ holdValue h
598+ askInvalidator >>= mapM_ (\wi -> liftIO $ modifyIORef' (holdInvalidators h) (wi:))
599+ askParentsRef >>= mapM_ (\r -> liftIO $ modifyIORef' r (SomeBehaviorSubscribed (BehaviorSubscribedHold h) :))
602+{-# SPECIALIZE readBehaviorUntracked :: HasSpiderTimeline x => Behavior x a -> BehaviorM x a #-}
603+{-# SPECIALIZE readBehaviorUntracked :: HasSpiderTimeline x => Behavior x a -> EventM x a #-}
604+readBehaviorUntracked :: Defer (SomeHoldInit x) m => Behavior x a -> m a
605+readBehaviorUntracked b = do
606+ holdInits <- getDeferralQueue
607+ liftIO $ runBehaviorM (readBehaviorTracked b) Nothing holdInits --TODO: Specialize readBehaviorTracked to the Nothing and Just cases
609+--------------------------------------------------------------------------------
611+--------------------------------------------------------------------------------
613+data Dynamic x p = Dynamic
614+ { dynamicCurrent :: !(Behavior x (R.PatchTarget p))
615+ , dynamicUpdated :: !(Event x p)
618+dynamicHold :: HasSpiderTimeline x => Hold x p -> Dynamic x p
619+dynamicHold !h = Dynamic
620+ { dynamicCurrent = behaviorHold h
621+ , dynamicUpdated = eventHold h
624+dynamicHoldIdentity :: HasSpiderTimeline x => Hold x (Identity a) -> Dynamic x (Identity a)
625+dynamicHoldIdentity = dynamicHold
627+dynamicConst :: R.PatchTarget p -> Dynamic x p
628+dynamicConst !a = Dynamic
629+ { dynamicCurrent = behaviorConst a
630+ , dynamicUpdated = eventNever
633+dynamicDyn :: (HasSpiderTimeline x, R.Patch p) => Dyn x p -> Dynamic x p
634+dynamicDyn !d = Dynamic
635+ { dynamicCurrent = behaviorDyn d
636+ , dynamicUpdated = eventDyn d
639+dynamicDynIdentity :: HasSpiderTimeline x => Dyn x (Identity a) -> Dynamic x (Identity a)
640+dynamicDynIdentity = dynamicDyn
642+--------------------------------------------------------------------------------
644+--------------------------------------------------------------------------------
646+--TODO: Figure out why certain things are not 'representational', then make them
647+--representational so we can use coerce
649+--type role Hold representational
651+ = Hold { holdValue :: !(IORef (R.PatchTarget p))
652+ , holdInvalidators :: !(IORef [Weak (Invalidator x)])
653+ , holdEvent :: Event x p -- This must be lazy, or holds cannot be defined before their input Events
654+ , holdParent :: !(IORef (Maybe (EventSubscription x))) -- Keeps its parent alive (will be undefined until the hold is initialized) --TODO: Probably shouldn't be an IORef
661+ = EventEnv { eventEnvAssignments :: !(IORef [SomeAssignment x]) -- Needed for Subscribe
662+ , eventEnvHoldInits :: !(IORef [SomeHoldInit x]) -- Needed for Subscribe
663+ , eventEnvMergeUpdates :: !(IORef [SomeMergeUpdate x])
664+ , eventEnvMergeInits :: !(IORef [SomeMergeInit x]) -- Needed for Subscribe
665+ , eventEnvClears :: !(IORef [SomeClear]) -- Needed for Subscribe
666+ , eventEnvRootClears :: !(IORef [SomeRootClear])
667+ , eventEnvCurrentHeight :: !(IORef Height) -- Needed for Subscribe
668+ , eventEnvResetCoincidences :: !(IORef [SomeResetCoincidence x]) -- Needed for Subscribe
669+ , eventEnvDelayedMerges :: !(IORef (IntMap [EventM x ()]))
672+{-# INLINE runEventM #-}
673+runEventM :: EventM x a -> IO a
676+asksEventEnv :: forall x a. HasSpiderTimeline x => (EventEnv x -> a) -> EventM x a
677+asksEventEnv f = return $ f $ _spiderTimeline_eventEnv (spiderTimeline :: SpiderTimeline x)
679+class MonadIO m => Defer a m where
680+ getDeferralQueue :: m (IORef [a])
683+defer :: Defer a m => a -> m ()
685+ q <- getDeferralQueue
686+ liftIO $ modifyIORef' q (a:)
688+instance HasSpiderTimeline x => Defer (SomeAssignment x) (EventM x) where
689+ {-# INLINE getDeferralQueue #-}
690+ getDeferralQueue = asksEventEnv eventEnvAssignments
692+instance HasSpiderTimeline x => Defer (SomeHoldInit x) (EventM x) where
693+ {-# INLINE getDeferralQueue #-}
694+ getDeferralQueue = asksEventEnv eventEnvHoldInits
696+instance HasSpiderTimeline x => Defer (SomeHoldInit x) (BehaviorM x) where
697+ {-# INLINE getDeferralQueue #-}
698+ getDeferralQueue = BehaviorM $ asks snd
700+instance HasSpiderTimeline x => Defer (SomeMergeUpdate x) (EventM x) where
701+ {-# INLINE getDeferralQueue #-}
702+ getDeferralQueue = asksEventEnv eventEnvMergeUpdates
704+instance HasSpiderTimeline x => Defer (SomeMergeInit x) (EventM x) where
705+ {-# INLINE getDeferralQueue #-}
706+ getDeferralQueue = asksEventEnv eventEnvMergeInits
708+class HasSpiderTimeline x => HasCurrentHeight x m | m -> x where
709+ getCurrentHeight :: m Height
710+ scheduleMerge :: Height -> EventM x () -> m ()
712+instance HasSpiderTimeline x => HasCurrentHeight x (EventM x) where
713+ {-# INLINE getCurrentHeight #-}
714+ getCurrentHeight = do
715+ heightRef <- asksEventEnv eventEnvCurrentHeight
716+ liftIO $ readIORef heightRef
717+ {-# INLINE scheduleMerge #-}
718+ scheduleMerge height subscribed = do
719+ delayedRef <- asksEventEnv eventEnvDelayedMerges
720+ liftIO $ modifyIORef' delayedRef $ IntMap.insertWith (++) (unHeight height) [subscribed]
722+class HasSpiderTimeline x where
723+ -- | Retrieve the current SpiderTimeline
724+ spiderTimeline :: SpiderTimeline x
726+instance HasSpiderTimeline Global where
727+ spiderTimeline = globalSpiderTimeline
729+putCurrentHeight :: HasSpiderTimeline x => Height -> EventM x ()
730+putCurrentHeight h = do
731+ heightRef <- asksEventEnv eventEnvCurrentHeight
732+ liftIO $ writeIORef heightRef $! h
734+instance HasSpiderTimeline x => Defer SomeClear (EventM x) where
735+ {-# INLINE getDeferralQueue #-}
736+ getDeferralQueue = asksEventEnv eventEnvClears
738+{-# INLINE scheduleClear #-}
739+scheduleClear :: Defer SomeClear m => IORef (Maybe a) -> m ()
740+scheduleClear r = defer $ SomeClear r
742+instance HasSpiderTimeline x => Defer SomeRootClear (EventM x) where
743+ {-# INLINE getDeferralQueue #-}
744+ getDeferralQueue = asksEventEnv eventEnvRootClears
746+{-# INLINE scheduleRootClear #-}
747+scheduleRootClear :: Defer SomeRootClear m => IORef (DMap k Identity) -> m ()
748+scheduleRootClear r = defer $ SomeRootClear r
750+instance HasSpiderTimeline x => Defer (SomeResetCoincidence x) (EventM x) where
751+ {-# INLINE getDeferralQueue #-}
752+ getDeferralQueue = asksEventEnv eventEnvResetCoincidences
754+-- Note: hold cannot examine its event until after the phase is over
755+{-# SPECIALIZE hold :: (HasSpiderTimeline x, R.Patch p) => R.PatchTarget p -> Event x p -> EventM x (Hold x p) #-}
756+{- SPECIALIZE hold :: (HasSpiderTimeline x, R.Patch p) => R.PatchTarget p -> Event x p -> ComputeM x (Hold x p) #-}
757+hold :: (R.Patch p, Defer (SomeHoldInit x) m) => R.PatchTarget p -> Event x p -> m (Hold x p)
759+ valRef <- liftIO $ newIORef v0
760+ invsRef <- liftIO $ newIORef []
761+ parentRef <- liftIO $ newIORef Nothing
763+ nodeId <- liftIO newNodeId
766+ { holdValue = valRef
767+ , holdInvalidators = invsRef
769+ , holdParent = parentRef
771+ , holdNodeId = nodeId
774+ defer $ SomeHoldInit h
777+{-# INLINE getHoldEventSubscription #-}
778+getHoldEventSubscription :: forall m p x. (Defer (SomeAssignment x) m, Defer (SomeHoldInit x) m, Defer SomeClear m, R.Patch p, HasCurrentHeight x m, Defer (SomeMergeInit x) m, Defer (SomeResetCoincidence x) m, HasSpiderTimeline x, m ~ EventM x) => Hold x p -> m (EventSubscription x)
779+getHoldEventSubscription h = do
780+ ep <- liftIO $ readIORef $ holdParent h
782+ Just subd -> return subd
785+ subscriptionRef <- liftIO $ newIORef $ error "getHoldEventSubscription: subdRef uninitialized"
786+ (subscription@(EventSubscription _ _), occ) <- subscribeAndRead e =<< liftIO (newSubscriberHold h)
787+ liftIO $ writeIORef subscriptionRef $! subscription
789+ Nothing -> return ()
791+ old <- liftIO $ readIORef $ holdValue h
792+ case R.apply o old of
793+ Nothing -> return ()
795+ -- Need to evaluate these so that we don't retain the Hold itself
796+ v <- liftIO $ evaluate $ holdValue h
797+ i <- liftIO $ evaluate $ holdInvalidators h
798+ defer $ SomeAssignment v i new
799+ liftIO $ writeIORef (holdParent h) $ Just subscription
802+type BehaviorEnv x = (Maybe (Weak (Invalidator x), IORef [SomeBehaviorSubscribed x]), IORef [SomeHoldInit x])
804+--type role BehaviorM representational
805+-- BehaviorM can sample behaviors
806+newtype BehaviorM x a = BehaviorM { unBehaviorM :: ReaderT (BehaviorEnv x) IO a } deriving (Functor, Applicative, MonadIO, MonadFix)
808+instance Monad (BehaviorM x) where
809+ {-# INLINE (>>=) #-}
810+ BehaviorM x >>= f = BehaviorM $ x >>= unBehaviorM . f
812+ BehaviorM x >> BehaviorM y = BehaviorM $ x >> y
813+ {-# INLINE return #-}
814+ return x = BehaviorM $ return x
816+ fail s = BehaviorM $ fail s
818+data BehaviorSubscribed x a
819+ = forall p. BehaviorSubscribedHold (Hold x p)
820+ | BehaviorSubscribedPull (PullSubscribed x a)
822+data SomeBehaviorSubscribed x = forall a. SomeBehaviorSubscribed (BehaviorSubscribed x a)
824+--type role PullSubscribed representational
825+data PullSubscribed x a
826+ = PullSubscribed { pullSubscribedValue :: !a
827+ , pullSubscribedInvalidators :: !(IORef [Weak (Invalidator x)])
828+ , pullSubscribedOwnInvalidator :: !(Invalidator x)
829+ , pullSubscribedParents :: ![SomeBehaviorSubscribed x] -- Need to keep parent behaviors alive, or they won't let us know when they're invalidated
832+--type role Pull representational
834+ = Pull { pullValue :: !(IORef (Maybe (PullSubscribed x a)))
835+ , pullCompute :: !(BehaviorM x a)
842+ = forall a. InvalidatorPull (Pull x a)
843+ | forall a. InvalidatorSwitch (SwitchSubscribed x a)
845+data RootSubscribed x a = forall k. GCompare k => RootSubscribed
846+ { rootSubscribedKey :: !(k a)
847+ , rootSubscribedCachedSubscribed :: !(IORef (DMap k (RootSubscribed x))) -- From the original Root
848+ , rootSubscribedSubscribers :: !(WeakBag (Subscriber x a))
849+ , rootSubscribedOccurrence :: !(IO (Maybe a)) -- Lookup from rootOccurrence
850+ , rootSubscribedUninit :: IO ()
851+ , 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?
853+ , rootSubscribedNodeId :: Int
857+data Root x (k :: * -> *)
858+ = Root { rootOccurrence :: !(IORef (DMap k Identity)) -- The currently-firing occurrence of this event
859+ , rootSubscribed :: !(IORef (DMap k (RootSubscribed x)))
860+ , rootInit :: !(forall a. k a -> RootTrigger x a -> IO (IO ()))
863+data SomeHoldInit x = forall p. R.Patch p => SomeHoldInit !(Hold x p)
865+data SomeMergeUpdate x = SomeMergeUpdate
866+ { _someMergeUpdate_update :: !(EventM x [EventSubscription x])
867+ , _someMergeUpdate_invalidateHeight :: !(IO ())
868+ , _someMergeUpdate_recalculateHeight :: !(IO ())
871+newtype SomeMergeInit x = SomeMergeInit { unSomeMergeInit :: EventM x () }
873+-- EventM can do everything BehaviorM can, plus create holds
874+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
876+newtype ComputeM x a = ComputeM (ReaderT (IORef [SomeHoldInit x]) IO a) deriving (Functor, Applicative, Monad, MonadIO, MonadFix)
878+instance Defer (SomeHoldInit x) (ComputeM x) where
879+ getDeferralQueue = ComputeM ask
881+{-# SPECIALIZE runComputeM :: HasSpiderTimeline x => ComputeM x a -> EventM x a #-}
882+runComputeM :: Defer (SomeHoldInit x) m => ComputeM x a -> m a
883+runComputeM (ComputeM a) = liftIO . runReaderT a =<< getDeferralQueue
885+newtype MergeSubscribedParent x a = MergeSubscribedParent { unMergeSubscribedParent :: EventSubscription x }
887+data HeightBag = HeightBag
888+ { _heightBag_size :: {-# UNPACK #-} !Int
889+ , _heightBag_contents :: !(IntMap Word) -- Number of excess in each bucket
891+ deriving (Show, Read, Eq, Ord)
893+heightBagEmpty :: HeightBag
894+heightBagEmpty = heightBagVerify $ HeightBag 0 IntMap.empty
896+heightBagSize :: HeightBag -> Int
897+heightBagSize = _heightBag_size
899+heightBagFromList :: [Height] -> HeightBag
900+heightBagFromList heights = heightBagVerify $ foldl' (flip heightBagAdd) heightBagEmpty heights
902+heightBagAdd :: Height -> HeightBag -> HeightBag
903+heightBagAdd (Height h) (HeightBag s c) = heightBagVerify $ HeightBag (succ s) $ IntMap.insertWithKey (\_ _ old -> succ old) h 0 c
905+heightBagRemove :: Height -> HeightBag -> HeightBag
906+heightBagRemove (Height h) b@(HeightBag s c) = heightBagVerify $ case IntMap.lookup h c of
907+ Nothing -> error $ "heightBagRemove: Height " <> show h <> " not present in bag " <> show b
908+ Just old -> HeightBag (pred s) $ case old of
909+ 0 -> IntMap.delete h c
910+ _ -> IntMap.insert h (pred old) c
912+heightBagMax :: HeightBag -> Height
913+heightBagMax (HeightBag _ c) = case IntMap.maxViewWithKey c of
914+ Just ((h, _), _) -> Height h
915+ Nothing -> zeroHeight
917+heightBagVerify :: HeightBag -> HeightBag
919+heightBagVerify b@(HeightBag s c) = if
920+ | s /= IntMap.size c + fromIntegral (sum (IntMap.elems c))
921+ -> error $ "heightBagVerify: size doesn't match: " <> show b
922+ | unHeight invalidHeight `IntMap.member` c
923+ -> error $ "heightBagVerify: contains invalid height: " <> show b
929+data FanSubscribedChildren (x :: *) k a = FanSubscribedChildren
930+ { _fanSubscribedChildren_list :: !(WeakBag (Subscriber x a))
931+ , _fanSubscribedChildren_self :: {-# NOUNPACK #-} !(k a, FanSubscribed x k)
932+ , _fanSubscribedChildren_weakSelf :: !(IORef (Weak (k a, FanSubscribed x k)))
935+data FanSubscribed (x :: *) k
936+ = FanSubscribed { fanSubscribedCachedSubscribed :: !(IORef (Maybe (FanSubscribed x k)))
937+ , fanSubscribedOccurrence :: !(IORef (Maybe (DMap k Identity)))
938+ , fanSubscribedSubscribers :: !(IORef (DMap k (FanSubscribedChildren x k))) -- This DMap should never be empty
939+ , fanSubscribedParent :: !(EventSubscription x)
941+ , fanSubscribedNodeId :: Int
946+ = Fan { fanParent :: !(Event x (DMap k Identity))
947+ , fanSubscribed :: !(IORef (Maybe (FanSubscribed x k)))
950+data SwitchSubscribed x a
951+ = SwitchSubscribed { switchSubscribedCachedSubscribed :: !(IORef (Maybe (SwitchSubscribed x a)))
952+ , switchSubscribedOccurrence :: !(IORef (Maybe a))
953+ , switchSubscribedHeight :: !(IORef Height)
954+ , switchSubscribedSubscribers :: !(WeakBag (Subscriber x a))
955+ , switchSubscribedOwnInvalidator :: {-# NOUNPACK #-} !(Invalidator x)
956+ , switchSubscribedOwnWeakInvalidator :: !(IORef (Weak (Invalidator x)))
957+ , switchSubscribedBehaviorParents :: !(IORef [SomeBehaviorSubscribed x])
958+ , switchSubscribedParent :: !(Behavior x (Event x a))
959+ , switchSubscribedCurrentParent :: !(IORef (EventSubscription x))
960+ , switchSubscribedWeakSelf :: !(IORef (Weak (SwitchSubscribed x a)))
962+ , switchSubscribedNodeId :: Int
967+ = Switch { switchParent :: !(Behavior x (Event x a))
968+ , switchSubscribed :: !(IORef (Maybe (SwitchSubscribed x a)))
971+{-# ANN CoincidenceSubscribed "HLint: ignore Redundant bracket" #-}
972+data CoincidenceSubscribed x a
973+ = CoincidenceSubscribed { coincidenceSubscribedCachedSubscribed :: !(IORef (Maybe (CoincidenceSubscribed x a)))
974+ , coincidenceSubscribedOccurrence :: !(IORef (Maybe a))
975+ , coincidenceSubscribedSubscribers :: !(WeakBag (Subscriber x a))
976+ , coincidenceSubscribedHeight :: !(IORef Height)
977+ , coincidenceSubscribedOuter :: {-# NOUNPACK #-} (Subscriber x (Event x a))
978+ , coincidenceSubscribedOuterParent :: !(EventSubscription x)
979+ , coincidenceSubscribedInnerParent :: !(IORef (Maybe (EventSubscribed x)))
980+ , coincidenceSubscribedWeakSelf :: !(IORef (Weak (CoincidenceSubscribed x a)))
982+ , coincidenceSubscribedNodeId :: Int
987+ = Coincidence { coincidenceParent :: !(Event x (Event x a))
988+ , coincidenceSubscribed :: !(IORef (Maybe (CoincidenceSubscribed x a)))
991+{-# NOINLINE newInvalidatorSwitch #-}
992+newInvalidatorSwitch :: SwitchSubscribed x a -> IO (Invalidator x)
993+newInvalidatorSwitch subd = return $! InvalidatorSwitch subd
995+{-# NOINLINE newInvalidatorPull #-}
996+newInvalidatorPull :: Pull x a -> IO (Invalidator x)
997+newInvalidatorPull p = return $! InvalidatorPull p
999+instance HasSpiderTimeline x => R.FunctorMaybe (Event x) where
1000+ fmapMaybe f = push $ return . f
1002+instance HasSpiderTimeline x => Align (Event x) where
1004+ align ea eb = R.fmapMaybe R.dmapToThese $ merge $ dynamicConst $ DMap.fromList [R.LeftTag :=> ea, R.RightTag :=> eb]
1006+newtype Dyn x p = Dyn { unDyn :: IORef (Either (BehaviorM x (R.PatchTarget p), Event x p) (Hold x p)) }
1008+newMapDyn :: HasSpiderTimeline x => (a -> b) -> Dynamic x (Identity a) -> Dynamic x (Identity b)
1009+newMapDyn f d = dynamicDynIdentity $ unsafeDyn (fmap f $ readBehaviorTracked $ dynamicCurrent d) (Identity . f . runIdentity <$> dynamicUpdated d)
1011+--TODO: Avoid the duplication between this and R.zipDynWith
1012+zipDynWith :: HasSpiderTimeline x => (a -> b -> c) -> Dynamic x (Identity a) -> Dynamic x (Identity b) -> Dynamic x (Identity c)
1013+zipDynWith f da db =
1014+ let eab = align (dynamicUpdated da) (dynamicUpdated db)
1015+ ec = flip push eab $ \o -> do
1016+ (a, b) <- case o of
1017+ This (Identity a) -> do
1018+ b <- readBehaviorUntracked $ dynamicCurrent db
1020+ That (Identity b) -> do
1021+ a <- readBehaviorUntracked $ dynamicCurrent da
1023+ These (Identity a) (Identity b) -> return (a, b)
1024+ return $ Just $ Identity $ f a b
1025+ in dynamicDynIdentity $ unsafeDyn (f <$> readBehaviorUntracked (dynamicCurrent da) <*> readBehaviorUntracked (dynamicCurrent db)) ec
1027+unsafeDyn :: BehaviorM x (R.PatchTarget p) -> Event x p -> Dyn x p
1028+unsafeDyn readV0 v' = Dyn $ unsafeNewIORef x $ Left x
1029+ where x = (readV0, v')
1031+newJoinDyn :: HasSpiderTimeline x => Dynamic x (Identity (Dynamic x (Identity a))) -> Dyn x (Identity a)
1033+ let readV0 = readBehaviorTracked . dynamicCurrent =<< readBehaviorTracked (dynamicCurrent d)
1034+ eOuter = push (fmap (Just . Identity) . readBehaviorUntracked . dynamicCurrent . runIdentity) $ dynamicUpdated d
1035+ eInner = switch $ dynamicUpdated <$> dynamicCurrent d
1036+ eBoth = coincidence $ dynamicUpdated . runIdentity <$> dynamicUpdated d
1037+ v' = unSpiderEvent $ R.leftmost $ map SpiderEvent [eBoth, eOuter, eInner]
1038+ in unsafeDyn readV0 v'
1040+-- ResultM can read behaviors and events
1041+type ResultM = EventM
1043+{-# NOINLINE unsafeNewIORef #-}
1044+unsafeNewIORef :: a -> b -> IORef b
1045+unsafeNewIORef _ b = unsafePerformIO $ newIORef b
1047+instance HasSpiderTimeline x => Functor (Event x) where
1048+ fmap f = push $ return . Just . f
1050+instance Functor (Behavior x) where
1051+ fmap f = pull . fmap f . readBehaviorTracked
1053+{-# INLINABLE push #-} --TODO: If this is helpful, we can get rid of the unsafeNewIORef and use unsafePerformIO directly
1054+push :: HasSpiderTimeline x => (a -> ComputeM x (Maybe b)) -> Event x a -> Event x b
1055+push f e = cacheEvent (pushCheap f e)
1057+push f e = eventPush $ Push
1060+ , pushSubscribed = unsafeNewIORef (f, e) Nothing --TODO: Does the use of the tuple here create unnecessary overhead?
1062+-- DISABLED: {- RULES "push/push" forall f g e. push f (push g e) = push (maybe (return Nothing) f <=< g) e #-}
1065+{-# INLINABLE pull #-}
1066+pull :: BehaviorM x a -> Behavior x a
1067+pull a = behaviorPull $ Pull
1069+ , pullValue = unsafeNewIORef a Nothing
1070+#ifdef DEBUG_NODEIDS
1071+ , pullNodeId = unsafeNodeId a
1075+{-# INLINABLE switch #-}
1076+switch :: HasSpiderTimeline x => Behavior x (Event x a) -> Event x a
1077+switch a = eventSwitch $ Switch
1079+ , switchSubscribed = unsafeNewIORef a Nothing
1082+coincidence :: HasSpiderTimeline x => Event x (Event x a) -> Event x a
1083+coincidence a = eventCoincidence $ Coincidence
1084+ { coincidenceParent = a
1085+ , coincidenceSubscribed = unsafeNewIORef a Nothing
1088+-- Propagate the given event occurrence; before cleaning up, run the given action, which may read the state of events and behaviors
1089+run :: forall x b. HasSpiderTimeline x => [DSum (RootTrigger x) Identity] -> ResultM x b -> SpiderHost x b
1090+run roots after = do
1091+ tracePropagate (Proxy :: Proxy x) $ "Running an event frame with " <> show (length roots) <> " events"
1092+ spiderTimeline <- SpiderHost ask
1093+ result <- SpiderHost $ lift $ withMVar (_spiderTimeline_lock spiderTimeline) $ \_ -> flip runReaderT spiderTimeline $ unSpiderHost $ runFrame $ do
1094+ rootsToPropagate <- forM roots $ \r@(RootTrigger (_, occRef, k) :=> a) -> do
1095+ occBefore <- liftIO $ do
1096+ occBefore <- readIORef occRef
1097+ writeIORef occRef $! DMap.insert k a occBefore
1099+ if DMap.null occBefore
1100+ then do scheduleRootClear occRef
1102+ else return Nothing
1103+ forM_ (catMaybes rootsToPropagate) $ \(RootTrigger (subscribersRef, _, _) :=> Identity a) -> do
1104+ propagate a subscribersRef
1105+ delayedRef <- asksEventEnv eventEnvDelayedMerges
1107+ delayed <- liftIO $ readIORef delayedRef
1108+ case IntMap.minViewWithKey delayed of
1109+ Nothing -> return ()
1110+ Just ((currentHeight, cur), future) -> do
1111+ tracePropagate (Proxy :: Proxy x) $ "Running height " ++ show currentHeight
1112+ putCurrentHeight $ Height currentHeight
1113+ liftIO $ writeIORef delayedRef $! future
1117+ putCurrentHeight maxBound
1119+ tracePropagate (Proxy :: Proxy x) "Done running an event frame"
1122+scheduleMerge' :: HasSpiderTimeline x => Height -> IORef Height -> EventM x () -> EventM x ()
1123+scheduleMerge' initialHeight heightRef a = scheduleMerge initialHeight $ do
1124+ height <- liftIO $ readIORef heightRef
1125+ currentHeight <- getCurrentHeight
1126+ case height `compare` currentHeight of
1127+ LT -> error "Somehow a merge's height has been decreased after it was scheduled"
1128+ GT -> scheduleMerge' height heightRef a -- The height has been increased (by a coincidence event; TODO: is this the only way?)
1131+data SomeClear = forall a. SomeClear (IORef (Maybe a))
1133+data SomeRootClear = forall k. SomeRootClear (IORef (DMap k Identity))
1135+data SomeAssignment x = forall a. SomeAssignment {-# UNPACK #-} !(IORef a) {-# UNPACK #-} !(IORef [Weak (Invalidator x)]) a
1137+debugFinalize :: Bool
1138+debugFinalize = False
1140+mkWeakPtrWithDebug :: a -> String -> IO (Weak a)
1141+mkWeakPtrWithDebug x debugNote = do
1145+ then Just $ putStrLn $ "finalizing: " ++ debugNote
1148+type WeakList a = [Weak a]
1150+{-# INLINE withIncreasedDepth #-}
1152+withIncreasedDepth :: CanTrace x m => m a -> m a
1153+withIncreasedDepth a = do
1154+ spiderTimeline <- askSpiderTimeline
1155+ liftIO $ modifyIORef' (_spiderTimeline_depth spiderTimeline) succ
1157+ liftIO $ modifyIORef' (_spiderTimeline_depth spiderTimeline) pred
1160+withIncreasedDepth :: m a -> m a
1161+withIncreasedDepth = id
1164+type CanTrace x m = (HasSpiderTimeline x, MonadIO m)
1166+{-# INLINE tracePropagate #-}
1167+tracePropagate :: (CanTrace x m) => proxy x -> String -> m ()
1168+tracePropagate p = traceWhen p debugPropagate
1170+{-# INLINE traceInvalidate #-}
1171+traceInvalidate :: String -> IO ()
1172+traceInvalidate = when debugInvalidate . liftIO . putStrLn
1174+{-# INLINE traceWhen #-}
1175+traceWhen :: (CanTrace x m) => proxy x -> Bool -> String -> m ()
1176+traceWhen p b message = traceMWhen p b $ return message
1178+{-# INLINE traceMWhen #-}
1179+traceMWhen :: (CanTrace x m) => proxy x -> Bool -> m String -> m ()
1180+traceMWhen _ b getMessage = when b $ do
1181+ message <- getMessage
1183+ spiderTimeline <- askSpiderTimeline
1184+ d <- liftIO $ readIORef $ _spiderTimeline_depth spiderTimeline
1188+ liftIO $ putStrLn $ replicate d ' ' <> message
1190+whoCreatedIORef :: IORef a -> IO [String]
1191+whoCreatedIORef (IORef a) = whoCreated $! a
1194+groupByHead :: Eq a => [NonEmpty a] -> [(a, NonEmpty [a])]
1197+ (x :| xs) : t -> case groupByHead t of
1198+ [] -> [(x, xs :| [])]
1200+ | x == y -> (x, xs `NonEmpty.cons` yss) : t'
1201+ | otherwise -> (x, xs :| []) : l
1203+listsToForest :: Eq a => [[a]] -> Forest a
1204+listsToForest l = fmap (\(a, l') -> Node a $ listsToForest $ toList l') $ groupByHead $ catMaybes $ fmap nonEmpty l
1207+{-# INLINE propagateSubscriberHold #-}
1208+propagateSubscriberHold :: forall x p. (HasSpiderTimeline x, R.Patch p) => Hold x p -> p -> EventM x ()
1209+propagateSubscriberHold h a = do
1210+ {-# SCC "trace" #-} traceMWhen (Proxy :: Proxy x) debugPropagate $ liftIO $ do
1211+ invalidators <- liftIO $ readIORef $ holdInvalidators h
1212+ return $ "SubscriberHold" <> showNodeId h <> ": " ++ show (length invalidators)
1213+ v <- {-# SCC "read" #-} liftIO $ readIORef $ holdValue h
1214+ case {-# SCC "apply" #-} R.apply a v of
1215+ Nothing -> return ()
1217+ {-# SCC "trace2" #-} withIncreasedDepth $ tracePropagate (Proxy :: Proxy x) $ "propagateSubscriberHold: assigning Hold" <> showNodeId h
1218+ vRef <- {-# SCC "vRef" #-} liftIO $ evaluate $ holdValue h
1219+ iRef <- {-# SCC "iRef" #-} liftIO $ evaluate $ holdInvalidators h
1220+ defer $ {-# SCC "assignment" #-} SomeAssignment vRef iRef v'
1222+data SomeResetCoincidence x = forall a. SomeResetCoincidence !(EventSubscription x) !(Maybe (CoincidenceSubscribed x a)) -- The CoincidenceSubscriber will be present only if heights need to be reset
1224+runBehaviorM :: BehaviorM x a -> Maybe (Weak (Invalidator x), IORef [SomeBehaviorSubscribed x]) -> IORef [SomeHoldInit x] -> IO a
1225+runBehaviorM a mwi holdInits = runReaderT (unBehaviorM a) (mwi, holdInits)
1227+askInvalidator :: BehaviorM x (Maybe (Weak (Invalidator x)))
1229+ (!m, _) <- BehaviorM ask
1231+ Nothing -> return Nothing
1232+ Just (!wi, _) -> return $ Just wi
1234+askParentsRef :: BehaviorM x (Maybe (IORef [SomeBehaviorSubscribed x]))
1236+ (!m, _) <- BehaviorM ask
1238+ Nothing -> return Nothing
1239+ Just (_, !p) -> return $ Just p
1241+askBehaviorHoldInits :: BehaviorM x (IORef [SomeHoldInit x])
1242+askBehaviorHoldInits = do
1243+ (_, !his) <- BehaviorM ask
1246+{-# INLINE getDynHold #-}
1247+getDynHold :: (Defer (SomeHoldInit x) m, R.Patch p) => Dyn x p -> m (Hold x p)
1249+ mh <- liftIO $ readIORef $ unDyn d
1251+ Right h -> return h
1252+ Left (readV0, v') -> do
1253+ holdInits <- getDeferralQueue
1254+ v0 <- liftIO $ runBehaviorM readV0 Nothing holdInits
1256+ liftIO $ writeIORef (unDyn d) $ Right h
1259+-- Always refers to 0
1260+{-# NOINLINE zeroRef #-}
1261+zeroRef :: IORef Height
1262+zeroRef = unsafePerformIO $ newIORef zeroHeight
1264+type CanSubscribe x m =
1265+ ( HasSpiderTimeline x
1266+ , HasCurrentHeight x m
1267+ , Defer (SomeHoldInit x) m, Defer (SomeMergeInit x) m -- The things we need to lazily initialize state
1268+ , Defer SomeClear m -- Wiping out event firings
1269+ , Defer (SomeAssignment x) m -- Updating state
1270+ , Defer (SomeResetCoincidence x) m
1274+getRootSubscribed :: GCompare k => k a -> Root x k -> Subscriber x a -> IO (WeakBagTicket, RootSubscribed x a, Maybe a)
1275+getRootSubscribed k r sub = do
1276+ mSubscribed <- readIORef $ rootSubscribed r
1277+ let getOcc = fmap (coerce . DMap.lookup k) $ readIORef $ rootOccurrence r
1278+ case DMap.lookup k mSubscribed of
1279+ Just subscribed -> {-# SCC "hitRoot" #-} do
1280+ sln <- subscribeRootSubscribed subscribed sub
1282+ return (sln, subscribed, occ)
1283+ Nothing -> {-# SCC "missRoot" #-} do
1284+ weakSelf <- newIORef $ error "getRootSubscribed: weakSelfRef not initialized"
1285+ let !cached = rootSubscribed r
1286+ uninitRef <- newIORef $ error "getRootsubscribed: uninitRef not initialized"
1287+ (subs, sln) <- WeakBag.singleton sub weakSelf cleanupRootSubscribed
1288+ when debugPropagate $ putStrLn $ "getRootSubscribed: calling rootInit"
1289+ uninit <- rootInit r k $ RootTrigger (subs, rootOccurrence r, k)
1290+ writeIORef uninitRef $! uninit
1291+ let subscribed = RootSubscribed
1292+ { rootSubscribedKey = k
1293+ , rootSubscribedCachedSubscribed = cached
1294+ , rootSubscribedOccurrence = getOcc
1295+ , rootSubscribedSubscribers = subs
1296+ , rootSubscribedUninit = uninit
1297+ , rootSubscribedWeakSelf = weakSelf
1298+#ifdef DEBUG_NODEIDS
1299+ , rootSubscribedNodeId = unsafeNodeId (k, r, subs)
1302+ writeIORef weakSelf =<< evaluate =<< mkWeakPtrWithDebug subscribed "RootSubscribed"
1303+ 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
1305+ return (sln, subscribed, occ)
1307+{-# ANN cleanupRootSubscribed "HLint: ignore Redundant bracket" #-}
1308+cleanupRootSubscribed :: RootSubscribed x a -> IO ()
1309+cleanupRootSubscribed self@(RootSubscribed { rootSubscribedKey = k, rootSubscribedCachedSubscribed = cached }) = do
1310+ rootSubscribedUninit self
1311+ modifyIORef' cached $ DMap.delete k
1313+{-# INLINE subscribeRootSubscribed #-}
1314+subscribeRootSubscribed :: RootSubscribed x a -> Subscriber x a -> IO WeakBagTicket
1315+subscribeRootSubscribed subscribed sub = WeakBag.insert sub (rootSubscribedSubscribers subscribed) (rootSubscribedWeakSelf subscribed) cleanupRootSubscribed
1317+{-# SPECIALIZE getFanSubscribed :: (HasSpiderTimeline x, GCompare k) => k a -> Fan x k -> Subscriber x a -> EventM x (WeakBagTicket, FanSubscribed x k, Maybe a) #-}
1318+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)
1319+getFanSubscribed k f sub = do
1320+ mSubscribed <- liftIO $ readIORef $ fanSubscribed f
1321+ case mSubscribed of
1322+ Just subscribed -> {-# SCC "hitFan" #-} liftIO $ do
1323+ sln <- subscribeFanSubscribed k subscribed sub
1324+ occ <- readIORef $ fanSubscribedOccurrence subscribed
1325+ return (sln, subscribed, coerce $ DMap.lookup k =<< occ)
1326+ Nothing -> {-# SCC "missFan" #-} do
1327+ subscribedRef <- liftIO $ newIORef $ error "getFanSubscribed: subscribedRef not yet initialized"
1328+ subscribedUnsafe <- liftIO $ unsafeInterleaveIO $ readIORef subscribedRef
1329+ s <- liftIO $ newSubscriberFan subscribedUnsafe
1330+ (subscription, parentOcc) <- subscribeAndRead (fanParent f) s
1331+ weakSelf <- liftIO $ newIORef $ error "getFanSubscribed: weakSelf not yet initialized"
1332+ (subsForK, slnForSub) <- liftIO $ WeakBag.singleton sub weakSelf cleanupFanSubscribed
1333+ subscribersRef <- liftIO $ newIORef $ error "getFanSubscribed: subscribersRef not yet initialized"
1334+ occRef <- liftIO $ newIORef parentOcc
1335+ when (isJust parentOcc) $ scheduleClear occRef
1336+ let subscribed = FanSubscribed
1337+ { fanSubscribedCachedSubscribed = fanSubscribed f
1338+ , fanSubscribedOccurrence = occRef
1339+ , fanSubscribedParent = subscription
1340+ , fanSubscribedSubscribers = subscribersRef
1341+#ifdef DEBUG_NODEIDS
1342+ , fanSubscribedNodeId = unsafeNodeId f
1345+ let !self = (k, subscribed)
1346+ liftIO $ writeIORef subscribersRef $! DMap.singleton k $ FanSubscribedChildren subsForK self weakSelf
1347+ liftIO $ writeIORef weakSelf =<< evaluate =<< mkWeakPtrWithDebug self "FanSubscribed"
1348+ liftIO $ writeIORef subscribedRef $! subscribed
1349+ liftIO $ writeIORef (fanSubscribed f) $ Just subscribed
1350+ return (slnForSub, subscribed, coerce $ DMap.lookup k =<< parentOcc)
1352+cleanupFanSubscribed :: GCompare k => (k a, FanSubscribed x k) -> IO ()
1353+cleanupFanSubscribed (k, subscribed) = do
1354+ subscribers <- readIORef $ fanSubscribedSubscribers subscribed
1355+ let reducedSubscribers = DMap.delete k subscribers
1356+ if DMap.null reducedSubscribers
1358+ unsubscribe $ fanSubscribedParent subscribed
1359+ -- Not necessary in this case, because this whole FanSubscribed is dead: writeIORef (fanSubscribedSubscribers subscribed) reducedSubscribers
1360+ writeIORef (fanSubscribedCachedSubscribed subscribed) Nothing
1361+ else writeIORef (fanSubscribedSubscribers subscribed) $! reducedSubscribers
1363+{-# INLINE subscribeFanSubscribed #-}
1364+subscribeFanSubscribed :: GCompare k => k a -> FanSubscribed x k -> Subscriber x a -> IO WeakBagTicket
1365+subscribeFanSubscribed k subscribed sub = do
1366+ subscribers <- readIORef $ fanSubscribedSubscribers subscribed
1367+ case DMap.lookup k subscribers of
1368+ Nothing -> {-# SCC "missSubscribeFanSubscribed" #-} do
1369+ let !self = (k, subscribed)
1370+ weakSelf <- newIORef =<< mkWeakPtrWithDebug self "FanSubscribed"
1371+ (list, sln) <- WeakBag.singleton sub weakSelf cleanupFanSubscribed
1372+ 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
1374+ Just (FanSubscribedChildren list _ weakSelf) -> {-# SCC "hitSubscribeFanSubscribed" #-} WeakBag.insert sub list weakSelf cleanupFanSubscribed
1376+{-# SPECIALIZE getSwitchSubscribed :: HasSpiderTimeline x => Switch x a -> Subscriber x a -> EventM x (WeakBagTicket, SwitchSubscribed x a, Maybe a) #-}
1377+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)
1378+getSwitchSubscribed s sub = do
1379+ mSubscribed <- liftIO $ readIORef $ switchSubscribed s
1380+ case mSubscribed of
1381+ Just subscribed -> {-# SCC "hitSwitch" #-} liftIO $ do
1382+ sln <- subscribeSwitchSubscribed subscribed sub
1383+ occ <- readIORef $ switchSubscribedOccurrence subscribed
1384+ return (sln, subscribed, occ)
1385+ Nothing -> {-# SCC "missSwitch" #-} do
1386+ subscribedRef <- liftIO $ newIORef $ error "getSwitchSubscribed: subscribed has not yet been created"
1387+ subscribedUnsafe <- liftIO $ unsafeInterleaveIO $ readIORef subscribedRef
1388+ i <- liftIO $ newInvalidatorSwitch subscribedUnsafe
1389+ mySub <- liftIO $ newSubscriberSwitch subscribedUnsafe
1390+ wi <- liftIO $ mkWeakPtrWithDebug i "InvalidatorSwitch"
1391+ wiRef <- liftIO $ newIORef wi
1392+ parentsRef <- liftIO $ newIORef [] --TODO: This should be unnecessary, because it will always be filled with just the single parent behavior
1393+ holdInits <- getDeferralQueue
1394+ e <- liftIO $ runBehaviorM (readBehaviorTracked (switchParent s)) (Just (wi, parentsRef)) holdInits
1395+ (subscription@(EventSubscription _ subd), parentOcc) <- subscribeAndRead e mySub
1396+ heightRef <- liftIO $ newIORef =<< getEventSubscribedHeight subd
1397+ subscriptionRef <- liftIO $ newIORef subscription
1398+ occRef <- liftIO $ newIORef parentOcc
1399+ when (isJust parentOcc) $ scheduleClear occRef
1400+ weakSelf <- liftIO $ newIORef $ error "getSwitchSubscribed: weakSelf not yet initialized"
1401+ (subs, slnForSub) <- liftIO $ WeakBag.singleton sub weakSelf cleanupSwitchSubscribed
1402+ let !subscribed = SwitchSubscribed
1403+ { switchSubscribedCachedSubscribed = switchSubscribed s
1404+ , switchSubscribedOccurrence = occRef
1405+ , switchSubscribedHeight = heightRef
1406+ , switchSubscribedSubscribers = subs
1407+ , switchSubscribedOwnInvalidator = i
1408+ , switchSubscribedOwnWeakInvalidator = wiRef
1409+ , switchSubscribedBehaviorParents = parentsRef
1410+ , switchSubscribedParent = switchParent s
1411+ , switchSubscribedCurrentParent = subscriptionRef
1412+ , switchSubscribedWeakSelf = weakSelf
1413+#ifdef DEBUG_NODEIDS
1414+ , switchSubscribedNodeId = unsafeNodeId s
1417+ liftIO $ writeIORef weakSelf =<< evaluate =<< mkWeakPtrWithDebug subscribed "switchSubscribedWeakSelf"
1418+ liftIO $ writeIORef subscribedRef $! subscribed
1419+ liftIO $ writeIORef (switchSubscribed s) $ Just subscribed
1420+ return (slnForSub, subscribed, parentOcc)
1422+cleanupSwitchSubscribed :: SwitchSubscribed x a -> IO ()
1423+cleanupSwitchSubscribed subscribed = do
1424+ unsubscribe =<< readIORef (switchSubscribedCurrentParent subscribed)
1425+ finalize =<< readIORef (switchSubscribedOwnWeakInvalidator subscribed) -- We don't need to get invalidated if we're dead
1426+ writeIORef (switchSubscribedCachedSubscribed subscribed) Nothing
1428+{-# INLINE subscribeSwitchSubscribed #-}
1429+subscribeSwitchSubscribed :: SwitchSubscribed x a -> Subscriber x a -> IO WeakBagTicket
1430+subscribeSwitchSubscribed subscribed sub = WeakBag.insert sub (switchSubscribedSubscribers subscribed) (switchSubscribedWeakSelf subscribed) cleanupSwitchSubscribed
1432+{-# SPECIALIZE getCoincidenceSubscribed :: HasSpiderTimeline x => Coincidence x a -> Subscriber x a -> EventM x (WeakBagTicket, CoincidenceSubscribed x a, Maybe a) #-}
1433+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)
1434+getCoincidenceSubscribed c sub = do
1435+ mSubscribed <- liftIO $ readIORef $ coincidenceSubscribed c
1436+ case mSubscribed of
1437+ Just subscribed -> {-# SCC "hitCoincidence" #-} liftIO $ do
1438+ sln <- subscribeCoincidenceSubscribed subscribed sub
1439+ occ <- readIORef $ coincidenceSubscribedOccurrence subscribed
1440+ return (sln, subscribed, occ)
1441+ Nothing -> {-# SCC "missCoincidence" #-} do
1442+ subscribedRef <- liftIO $ newIORef $ error "getCoincidenceSubscribed: subscribed has not yet been created"
1443+ subscribedUnsafe <- liftIO $ unsafeInterleaveIO $ readIORef subscribedRef
1444+ subOuter <- liftIO $ newSubscriberCoincidenceOuter subscribedUnsafe
1445+ (outerSubscription@(EventSubscription _ outerSubd), outerOcc) <- subscribeAndRead (coincidenceParent c) subOuter
1446+ outerHeight <- liftIO $ getEventSubscribedHeight outerSubd
1447+ (occ, height, mInnerSubd) <- case outerOcc of
1448+ Nothing -> return (Nothing, outerHeight, Nothing)
1450+ (occ, height, innerSubd) <- subscribeCoincidenceInner o outerHeight subscribedUnsafe
1451+ return (occ, height, Just innerSubd)
1452+ occRef <- liftIO $ newIORef occ
1453+ when (isJust occ) $ scheduleClear occRef
1454+ heightRef <- liftIO $ newIORef height
1455+ innerSubdRef <- liftIO $ newIORef mInnerSubd
1456+ scheduleClear innerSubdRef
1457+ weakSelf <- liftIO $ newIORef $ error "getCoincidenceSubscribed: weakSelf not yet implemented"
1458+ (subs, slnForSub) <- liftIO $ WeakBag.singleton sub weakSelf cleanupCoincidenceSubscribed
1459+ let subscribed = CoincidenceSubscribed
1460+ { coincidenceSubscribedCachedSubscribed = coincidenceSubscribed c
1461+ , coincidenceSubscribedOccurrence = occRef
1462+ , coincidenceSubscribedHeight = heightRef
1463+ , coincidenceSubscribedSubscribers = subs
1464+ , coincidenceSubscribedOuter = subOuter
1465+ , coincidenceSubscribedOuterParent = outerSubscription
1466+ , coincidenceSubscribedInnerParent = innerSubdRef
1467+ , coincidenceSubscribedWeakSelf = weakSelf
1468+#ifdef DEBUG_NODEIDS
1469+ , coincidenceSubscribedNodeId = unsafeNodeId c
1472+ liftIO $ writeIORef weakSelf =<< evaluate =<< mkWeakPtrWithDebug subscribed "CoincidenceSubscribed"
1473+ liftIO $ writeIORef subscribedRef $! subscribed
1474+ liftIO $ writeIORef (coincidenceSubscribed c) $ Just subscribed
1475+ return (slnForSub, subscribed, occ)
1477+cleanupCoincidenceSubscribed :: CoincidenceSubscribed x a -> IO ()
1478+cleanupCoincidenceSubscribed subscribed = do
1479+ unsubscribe $ coincidenceSubscribedOuterParent subscribed
1480+ writeIORef (coincidenceSubscribedCachedSubscribed subscribed) Nothing
1482+{-# INLINE subscribeCoincidenceSubscribed #-}
1483+subscribeCoincidenceSubscribed :: CoincidenceSubscribed x a -> Subscriber x a -> IO WeakBagTicket
1484+subscribeCoincidenceSubscribed subscribed sub = WeakBag.insert sub (coincidenceSubscribedSubscribers subscribed) (coincidenceSubscribedWeakSelf subscribed) cleanupCoincidenceSubscribed
1486+{-# INLINE merge #-}
1487+merge :: forall k x. (HasSpiderTimeline x, GCompare k) => Dynamic x (R.PatchDMap k (Event x)) -> Event x (DMap k Identity)
1488+merge d = cacheEvent $ Event $ \sub -> do
1489+ initialParents <- readBehaviorUntracked $ dynamicCurrent d
1490+ accumRef <- liftIO $ newIORef $ error "merge: accumRef not yet initialized"
1491+ heightRef <- liftIO $ newIORef $ error "merge: heightRef not yet initialized"
1492+ heightBagRef <- liftIO $ newIORef $ error "merge: heightBagRef not yet initialized"
1493+ parentsRef <- liftIO $ newIORef $ error "merge: parentsRef not yet initialized"
1494+ let scheduleSelf height = scheduleMerge' height heightRef $ do
1495+ m <- liftIO $ readIORef accumRef
1496+ liftIO $ writeIORef accumRef $! DMap.empty
1497+ --TODO: Assert that m is not empty
1498+ subscriberPropagate sub m
1499+ invalidateMyHeight = do
1500+ oldHeight <- readIORef heightRef
1501+ 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
1502+ writeIORef heightRef $! invalidHeight
1503+ subscriberInvalidateHeight sub oldHeight
1504+ revalidateMyHeight = do
1505+ currentHeight <- readIORef heightRef
1506+ when (currentHeight == invalidHeight) $ do -- revalidateMergeHeight may be called multiple times; perhaps the's a way to finesse it to avoid this check
1507+ heights <- readIORef heightBagRef
1508+ parents <- readIORef parentsRef
1509+ -- When the number of heights in the bag reaches the number of parents, we should have a valid height
1510+ case heightBagSize heights `compare` DMap.size parents of
1513+ let height = succHeight $ heightBagMax heights
1514+ when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: height: " <> show height
1515+ writeIORef heightRef $! height
1516+ subscriberRecalculateHeight sub height
1517+ GT -> error $ "revalidateMergeHeight: more heights than parents for Merge"
1518+ subscriber :: forall a. k a -> Subscriber x a
1519+ subscriber k = Subscriber
1520+ { subscriberPropagate = \a -> do
1521+ oldM <- liftIO $ readIORef accumRef
1522+ let newM = DMap.insertWith (error $ "Same key fired multiple times for Merge") k (Identity a) oldM
1523+ tracePropagate (Proxy :: Proxy x) $ " DMap.size oldM = " <> show (DMap.size oldM) <> "; DMap.size newM = " <> show (DMap.size newM)
1524+ liftIO $ writeIORef accumRef $! newM
1525+ when (DMap.null oldM) $ do -- Only schedule the firing once
1526+ height <- liftIO $ readIORef heightRef
1527+ --TODO: assertions about height
1528+ currentHeight <- getCurrentHeight
1529+ when (height <= currentHeight) $ do
1530+ if height /= invalidHeight
1532+ myStack <- liftIO $ whoCreatedIORef undefined --TODO
1533+ error $ "Height (" ++ show height ++ ") is not greater than current height (" ++ show currentHeight ++ ")\n" ++ unlines (reverse myStack)
1536+ nodesInvolvedInCycle <- walkInvalidHeightParents $ eventSubscribedMerge subscribed
1537+ stacks <- forM nodesInvolvedInCycle $ \(Some.This es) -> whoCreatedEventSubscribed es
1538+ let cycleInfo = ":\n" <> drawForest (listsToForest stacks)
1542+ error $ "Causality loop found" <> cycleInfo
1543+ scheduleSelf height
1544+ , subscriberInvalidateHeight = \old -> do --TODO: When removing a parent doesn't actually change the height, maybe we can avoid invalidating
1545+ modifyIORef' heightBagRef $ heightBagRemove old
1547+ , subscriberRecalculateHeight = \new -> do
1548+ modifyIORef' heightBagRef $ heightBagAdd new
1551+ subscribers :: [(Maybe (DSum k Identity), Height, DSum k (MergeSubscribedParent x))] <- forM (DMap.toList initialParents) $ \(k :=> e) -> do
1552+ let s = subscriber k
1553+ (subscription@(EventSubscription _ parentSubd), parentOcc) <- subscribeAndRead e s
1554+ height <- liftIO $ getEventSubscribedHeight parentSubd
1555+ return $ (fmap (\x -> k :=> Identity x) parentOcc, height, k :=> MergeSubscribedParent subscription)
1556+ let dm = DMap.fromDistinctAscList $ mapMaybe (\(x, _, _) -> x) subscribers
1557+ heights = fmap (\(_, h, _) -> h) subscribers --TODO: Assert that there's no invalidHeight in here
1558+ myHeightBag = heightBagFromList $ filter (/= invalidHeight) heights
1559+ myHeight = if invalidHeight `elem` heights
1561+ else succHeight $ heightBagMax myHeightBag
1562+ currentHeight <- getCurrentHeight
1563+ let (occ, accum) = if currentHeight >= myHeight -- If we should have fired by now
1564+ then (if DMap.null dm then Nothing else Just dm, DMap.empty)
1566+ unless (DMap.null accum) $ do
1567+ scheduleSelf myHeight
1568+ occRef <- liftIO $ newIORef occ
1569+ when (isJust occ) $ scheduleClear occRef
1570+ liftIO $ writeIORef accumRef $! accum
1571+ liftIO $ writeIORef heightRef $! myHeight
1572+ liftIO $ writeIORef heightBagRef $! myHeightBag
1573+ changeSubdRef <- liftIO $ newIORef $ error "getMergeSubscribed: changeSubdRef not yet initialized"
1574+ liftIO $ writeIORef parentsRef $! DMap.fromDistinctAscList $ map (\(_, _, x) -> x) subscribers
1575+ let updateMe (R.PatchDMap p) = do
1576+ oldParents <- liftIO $ readIORef parentsRef
1577+ let f (subscriptionsToKill, ps) (k :=> R.ComposeMaybe me) = do
1578+ (mOldSubd, newPs) <- case me of
1579+ Nothing -> return $ DMap.updateLookupWithKey (\_ _ -> Nothing) k ps
1581+ let s = subscriber k
1582+ subscription@(EventSubscription _ subd) <- subscribe e s
1583+ newParentHeight <- liftIO $ getEventSubscribedHeight subd
1584+ let newParent = MergeSubscribedParent subscription
1585+ liftIO $ modifyIORef' heightBagRef $ heightBagAdd newParentHeight
1586+ return $ DMap.insertLookupWithKey' (\_ new _ -> new) k newParent ps
1587+ forM_ mOldSubd $ \oldSubd -> do
1588+ oldHeight <- liftIO $ getEventSubscribedHeight $ _eventSubscription_subscribed $ unMergeSubscribedParent oldSubd
1589+ liftIO $ modifyIORef heightBagRef $ heightBagRemove oldHeight
1590+ return (maybeToList (unMergeSubscribedParent <$> mOldSubd) ++ subscriptionsToKill, newPs)
1591+ (subscriptionsToKill, newParents) <- foldM f ([], oldParents) $ DMap.toList p --TODO: I think this runEventM is OK, since no events are firing at this time, but it might not be
1592+ liftIO $ writeIORef parentsRef $! newParents
1593+ return subscriptionsToKill
1594+ defer $ SomeMergeInit $ do
1596+ { subscriberPropagate = \a -> {-# SCC "traverseMergeChange" #-} do
1597+ tracePropagate (Proxy :: Proxy x) $ "SubscriberMerge/Change"
1598+ defer $ SomeMergeUpdate (updateMe a) invalidateMyHeight revalidateMyHeight
1599+ , subscriberInvalidateHeight = \_ -> return ()
1600+ , subscriberRecalculateHeight = \_ -> return ()
1602+ (EventSubscription _ changeSubd, change) <- subscribeAndRead (dynamicUpdated d) s
1603+ forM_ change $ \c -> defer $ SomeMergeUpdate (updateMe c) invalidateMyHeight revalidateMyHeight
1604+ liftIO $ writeIORef changeSubdRef (s, changeSubd)
1605+ let unsubscribeAll = do
1606+ parents <- readIORef parentsRef
1607+ forM_ (DMap.toList parents) $ \(_ :=> MergeSubscribedParent s) -> unsubscribe s
1608+ return ( EventSubscription unsubscribeAll $ EventSubscribed heightRef $ toAny (parentsRef, changeSubdRef)
1612+newtype EventSelector x k = EventSelector { select :: forall a. k a -> Event x a }
1614+fan :: (HasSpiderTimeline x, GCompare k) => Event x (DMap k Identity) -> EventSelector x k
1618+ , fanSubscribed = unsafeNewIORef e Nothing
1620+ in EventSelector $ \k -> eventFan k f
1622+runHoldInits :: HasSpiderTimeline x => IORef [SomeHoldInit x] -> IORef [SomeMergeInit x] -> EventM x ()
1623+runHoldInits holdInitRef mergeInitRef = do
1624+ holdInits <- liftIO $ readIORef holdInitRef
1625+ mergeInits <- liftIO $ readIORef mergeInitRef
1626+ unless (null holdInits && null mergeInits) $ do
1627+ liftIO $ writeIORef holdInitRef []
1628+ liftIO $ writeIORef mergeInitRef []
1629+ mapM_ initHold holdInits
1630+ mapM_ unSomeMergeInit mergeInits
1631+ runHoldInits holdInitRef mergeInitRef
1633+initHold :: HasSpiderTimeline x => SomeHoldInit x -> EventM x ()
1634+initHold (SomeHoldInit h) = void $ getHoldEventSubscription h
1636+newEventEnv :: IO (EventEnv x)
1638+ toAssignRef <- newIORef [] -- This should only actually get used when events are firing
1639+ holdInitRef <- newIORef []
1640+ mergeUpdateRef <- newIORef []
1641+ mergeInitRef <- newIORef []
1642+ heightRef <- newIORef zeroHeight
1643+ toClearRef <- newIORef []
1644+ toClearRootRef <- newIORef []
1645+ coincidenceInfosRef <- newIORef []
1646+ delayedRef <- newIORef IntMap.empty
1647+ return $ EventEnv toAssignRef holdInitRef mergeUpdateRef mergeInitRef toClearRef toClearRootRef heightRef coincidenceInfosRef delayedRef
1649+clearEventEnv :: EventEnv x -> IO ()
1650+clearEventEnv (EventEnv toAssignRef holdInitRef mergeUpdateRef mergeInitRef toClearRef toClearRootRef heightRef coincidenceInfosRef delayedRef) = do
1651+ writeIORef toAssignRef []
1652+ writeIORef holdInitRef []
1653+ writeIORef mergeUpdateRef []
1654+ writeIORef mergeInitRef []
1655+ writeIORef heightRef zeroHeight
1656+ writeIORef toClearRef []
1657+ writeIORef toClearRootRef []
1658+ writeIORef coincidenceInfosRef []
1659+ writeIORef delayedRef IntMap.empty
1661+-- | Run an event action outside of a frame
1662+runFrame :: forall x a. HasSpiderTimeline x => EventM x a -> SpiderHost x a --TODO: This function also needs to hold the mutex
1663+runFrame a = SpiderHost $ ask >>= \spiderTimeline -> lift $ do
1664+ let env = _spiderTimeline_eventEnv (spiderTimeline :: SpiderTimeline x)
1667+ 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
1669+ result <- runEventM go
1670+ toClear <- readIORef $ eventEnvClears env
1671+ forM_ toClear $ \(SomeClear ref) -> {-# SCC "clear" #-} writeIORef ref Nothing
1672+ toClearRoot <- readIORef $ eventEnvRootClears env
1673+ forM_ toClearRoot $ \(SomeRootClear ref) -> {-# SCC "rootClear" #-} writeIORef ref $! DMap.empty
1674+ toAssign <- readIORef $ eventEnvAssignments env
1675+ toReconnectRef <- newIORef []
1676+ coincidenceInfos <- readIORef $ eventEnvResetCoincidences env
1677+ forM_ toAssign $ \(SomeAssignment vRef iRef v) -> {-# SCC "assignment" #-} do
1679+ when debugInvalidate $ putStrLn $ "Invalidating Hold"
1680+ writeIORef iRef =<< evaluate =<< invalidate toReconnectRef =<< readIORef iRef
1681+ mergeUpdates <- readIORef $ eventEnvMergeUpdates env
1682+ writeIORef (eventEnvMergeUpdates env) []
1683+ when debugPropagate $ putStrLn "Updating merges"
1684+ mergeSubscriptionsToKill <- runEventM $ concat <$> mapM _someMergeUpdate_update mergeUpdates
1685+ when debugPropagate $ putStrLn "Updating merges done"
1686+ toReconnect <- readIORef toReconnectRef
1688+ switchSubscriptionsToKill <- forM toReconnect $ \(SomeSwitchSubscribed subscribed) -> {-# SCC "switchSubscribed" #-} do
1689+ oldSubscription <- readIORef $ switchSubscribedCurrentParent subscribed
1690+ wi <- readIORef $ switchSubscribedOwnWeakInvalidator subscribed
1691+ when debugInvalidate $ putStrLn $ "Finalizing invalidator for Switch" <> showNodeId subscribed
1693+ i <- evaluate $ switchSubscribedOwnInvalidator subscribed
1694+ wi' <- mkWeakPtrWithDebug i "wi'"
1695+ writeIORef (switchSubscribedOwnWeakInvalidator subscribed) $! wi'
1696+ writeIORef (switchSubscribedBehaviorParents subscribed) []
1697+ writeIORef (eventEnvHoldInits env) [] --TODO: Should we reuse this?
1698+ e <- runBehaviorM (readBehaviorTracked (switchSubscribedParent subscribed)) (Just (wi', switchSubscribedBehaviorParents subscribed)) $ eventEnvHoldInits env
1699+ 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
1700+ --TODO: Make sure we touch the pieces of the SwitchSubscribed at the appropriate times
1701+ sub <- newSubscriberSwitch subscribed
1702+ 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
1704+ stackTrace <- liftIO $ fmap renderStack $ ccsToStrings =<< (getCCSOf $! switchSubscribedParent subscribed)
1705+ liftIO $ putStrLn $ (++stackTrace) $ "subd' subscribed to " ++ case e of
1706+ EventRoot _ -> "EventRoot"
1707+ EventNever -> "EventNever"
1708+ _ -> "something else"
1710+ writeIORef (switchSubscribedCurrentParent subscribed) $! subscription
1711+ return oldSubscription
1712+ liftIO $ mapM_ unsubscribe mergeSubscriptionsToKill
1713+ liftIO $ mapM_ unsubscribe switchSubscriptionsToKill
1714+ forM_ toReconnect $ \(SomeSwitchSubscribed subscribed) -> {-# SCC "switchSubscribed" #-} do
1715+ EventSubscription _ subd' <- readIORef $ switchSubscribedCurrentParent subscribed
1716+ parentHeight <- getEventSubscribedHeight subd'
1717+ myHeight <- readIORef $ switchSubscribedHeight subscribed
1718+ when (parentHeight /= myHeight) $ do
1719+ writeIORef (switchSubscribedHeight subscribed) $! invalidHeight
1720+ WeakBag.traverse (switchSubscribedSubscribers subscribed) $ invalidateSubscriberHeight myHeight
1721+ 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
1722+ forM_ coincidenceInfos $ \(SomeResetCoincidence subscription mcs) -> do
1723+ unsubscribe subscription
1724+ mapM_ invalidateCoincidenceHeight mcs
1725+ forM_ coincidenceInfos $ \(SomeResetCoincidence _ mcs) -> mapM_ recalculateCoincidenceHeight mcs
1726+ mapM_ _someMergeUpdate_recalculateHeight mergeUpdates
1727+ forM_ toReconnect $ \(SomeSwitchSubscribed subscribed) -> do
1728+ height <- calculateSwitchHeight subscribed
1729+ updateSwitchHeight height subscribed
1732+newtype Height = Height { unHeight :: Int } deriving (Show, Read, Eq, Ord, Bounded)
1734+{-# INLINE zeroHeight #-}
1735+zeroHeight :: Height
1736+zeroHeight = Height 0
1738+{-# INLINE invalidHeight #-}
1739+invalidHeight :: Height
1740+invalidHeight = Height (-1000)
1743+-- | An invalid height that is currently being traversed, e.g. by walkInvalidHeightParents
1744+{-# INLINE invalidHeightBeingTraversed #-}
1745+invalidHeightBeingTraversed :: Height
1746+invalidHeightBeingTraversed = Height (-1001)
1749+{-# INLINE succHeight #-}
1750+succHeight :: Height -> Height
1751+succHeight h@(Height a) =
1752+ if h == invalidHeight
1754+ else Height $ succ a
1756+invalidateCoincidenceHeight :: CoincidenceSubscribed x a -> IO ()
1757+invalidateCoincidenceHeight subscribed = do
1758+ oldHeight <- readIORef $ coincidenceSubscribedHeight subscribed
1759+ when (oldHeight /= invalidHeight) $ do
1760+ writeIORef (coincidenceSubscribedHeight subscribed) $! invalidHeight
1761+ WeakBag.traverse (coincidenceSubscribedSubscribers subscribed) $ invalidateSubscriberHeight oldHeight
1763+updateSwitchHeight :: Height -> SwitchSubscribed x a -> IO ()
1764+updateSwitchHeight new subscribed = do
1765+ oldHeight <- readIORef $ switchSubscribedHeight subscribed
1766+ when (oldHeight == invalidHeight) $ do --TODO: This 'when' should probably be an assertion
1767+ when (new /= invalidHeight) $ do --TODO: This 'when' should probably be an assertion
1768+ writeIORef (switchSubscribedHeight subscribed) $! new
1769+ WeakBag.traverse (switchSubscribedSubscribers subscribed) $ recalculateSubscriberHeight new
1771+recalculateCoincidenceHeight :: CoincidenceSubscribed x a -> IO ()
1772+recalculateCoincidenceHeight subscribed = do
1773+ oldHeight <- readIORef $ coincidenceSubscribedHeight subscribed
1774+ when (oldHeight == invalidHeight) $ do --TODO: This 'when' should probably be an assertion
1775+ height <- calculateCoincidenceHeight subscribed
1776+ when (height /= invalidHeight) $ do
1777+ writeIORef (coincidenceSubscribedHeight subscribed) $! height
1778+ WeakBag.traverse (coincidenceSubscribedSubscribers subscribed) $ recalculateSubscriberHeight height
1780+calculateSwitchHeight :: SwitchSubscribed x a -> IO Height
1781+calculateSwitchHeight subscribed = getEventSubscribedHeight . _eventSubscription_subscribed =<< readIORef (switchSubscribedCurrentParent subscribed)
1783+calculateCoincidenceHeight :: CoincidenceSubscribed x a -> IO Height
1784+calculateCoincidenceHeight subscribed = do
1785+ outerHeight <- getEventSubscribedHeight $ _eventSubscription_subscribed $ coincidenceSubscribedOuterParent subscribed
1786+ innerHeight <- maybe (return zeroHeight) getEventSubscribedHeight =<< readIORef (coincidenceSubscribedInnerParent subscribed)
1787+ return $ if outerHeight == invalidHeight || innerHeight == invalidHeight then invalidHeight else max outerHeight innerHeight
1789+data SomeSwitchSubscribed x = forall a. SomeSwitchSubscribed {-# NOUNPACK #-} (SwitchSubscribed x a)
1791+invalidate :: IORef [SomeSwitchSubscribed x] -> WeakList (Invalidator x) -> IO (WeakList (Invalidator x))
1792+invalidate toReconnectRef wis = do
1793+ forM_ wis $ \wi -> do
1797+ traceInvalidate "invalidate Dead"
1798+ return () --TODO: Should we clean this up here?
1800+ finalize wi -- Once something's invalidated, it doesn't need to hang around; this will change when some things are strict
1802+ InvalidatorPull p -> do
1803+ traceInvalidate $ "invalidate: Pull" <> showNodeId p
1804+ mVal <- readIORef $ pullValue p
1805+ forM_ mVal $ \val -> do
1806+ writeIORef (pullValue p) Nothing
1807+ writeIORef (pullSubscribedInvalidators val) =<< evaluate =<< invalidate toReconnectRef =<< readIORef (pullSubscribedInvalidators val)
1808+ InvalidatorSwitch subscribed -> do
1809+ traceInvalidate $ "invalidate: Switch" <> showNodeId subscribed
1810+ modifyIORef' toReconnectRef (SomeSwitchSubscribed subscribed :)
1811+ 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
1813+--------------------------------------------------------------------------------
1814+-- Reflex integration
1815+--------------------------------------------------------------------------------
1817+-- | The default, global Spider environment
1818+type Spider = SpiderTimeline Global
1820+-- | Designates the default, global Spider timeline
1823+{-# NOINLINE globalSpiderTimeline #-}
1824+globalSpiderTimeline :: SpiderTimeline Global
1825+globalSpiderTimeline = unsafePerformIO unsafeNewSpiderTimeline
1827+-- | Stores all global data relevant to a particular Spider timeline; only one
1828+-- value should exist for each type @x@
1829+data SpiderTimeline x = SpiderTimeline
1830+ { _spiderTimeline_lock :: {-# UNPACK #-} !(MVar ())
1831+ , _spiderTimeline_eventEnv :: {-# UNPACK #-} !(EventEnv x)
1833+ , _spiderTimeline_depth :: {-# UNPACK #-} !(IORef Int)
1836+type role SpiderTimeline nominal
1838+instance GEq SpiderTimeline where
1839+ a `geq` b = if _spiderTimeline_lock a == _spiderTimeline_lock b
1840+ then Just $ unsafeCoerce Refl -- This unsafeCoerce is safe because the same SpiderTimeline can't have two different 'x' arguments
1843+unsafeNewSpiderTimeline :: forall x. IO (SpiderTimeline x)
1844+unsafeNewSpiderTimeline = do
1848+ depthRef <- newIORef 0
1850+ return $ SpiderTimeline
1851+ { _spiderTimeline_lock = lock
1852+ , _spiderTimeline_eventEnv = env
1854+ , _spiderTimeline_depth = depthRef
1858+-- | Create a new SpiderTimeline
1859+newSpiderTimeline :: IO (Some SpiderTimeline)
1860+newSpiderTimeline = withSpiderTimeline (pure . Some.This)
1862+-- | Pass a new timeline to the given function.
1863+withSpiderTimeline :: (forall x. SpiderTimeline x -> IO r) -> IO r
1864+withSpiderTimeline k = unsafeNewSpiderTimeline >>= k
1866+newtype SpiderPullM x a = SpiderPullM (BehaviorM x a) deriving (Functor, Applicative, Monad, MonadIO, MonadFix)
1868+newtype SpiderPushM x a = SpiderPushM (ComputeM x a) deriving (Functor, Applicative, Monad, MonadIO, MonadFix)
1870+instance HasSpiderTimeline x => Functor (R.Dynamic (SpiderTimeline x)) where
1871+ fmap f = SpiderDynamic . newMapDyn f . unSpiderDynamic
1873+instance HasSpiderTimeline x => Applicative (R.Dynamic (SpiderTimeline x)) where
1874+ pure = SpiderDynamic . dynamicConst
1875+ SpiderDynamic a <*> SpiderDynamic b = SpiderDynamic $ zipDynWith ($) a b
1879+instance HasSpiderTimeline x => Monad (R.Dynamic (SpiderTimeline x)) where
1880+ {-# INLINE return #-}
1882+ {-# INLINE (>>=) #-}
1883+ x >>= f = SpiderDynamic $ dynamicDynIdentity $ newJoinDyn $ newMapDyn (unSpiderDynamic . f) $ unSpiderDynamic x
1884+ {-# INLINE (>>) #-}
1886+ {-# INLINE fail #-}
1887+ fail _ = error "Dynamic does not support 'fail'"
1889+instance HasSpiderTimeline x => R.Reflex (SpiderTimeline x) where
1890+ newtype Behavior (SpiderTimeline x) a = SpiderBehavior { unSpiderBehavior :: Behavior x a }
1891+ newtype Event (SpiderTimeline x) a = SpiderEvent { unSpiderEvent :: Event x a }
1892+ newtype Dynamic (SpiderTimeline x) a = SpiderDynamic { unSpiderDynamic :: Dynamic x (Identity a) } -- deriving (Functor, Applicative, Monad)
1893+ newtype Incremental (SpiderTimeline x) p = SpiderIncremental { unSpiderIncremental :: Dynamic x p }
1894+ type PullM (SpiderTimeline x) = SpiderPullM x
1895+ type PushM (SpiderTimeline x) = SpiderPushM x
1896+ {-# INLINABLE never #-}
1897+ never = SpiderEvent eventNever
1898+ {-# INLINABLE constant #-}
1899+ constant = SpiderBehavior . behaviorConst
1900+ {-# INLINABLE push #-}
1901+ push f = SpiderEvent . push (coerce f) . unSpiderEvent
1902+ {-# INLINABLE pull #-}
1903+ pull = SpiderBehavior . pull . coerce
1904+ {-# INLINABLE merge #-}
1905+ merge = SpiderEvent . merge . dynamicConst . (coerce :: DMap k (R.Event (SpiderTimeline x)) -> DMap k (Event x))
1906+ {-# INLINABLE fan #-}
1907+ fan e = R.EventSelector $ SpiderEvent . select (fan (unSpiderEvent e))
1908+ {-# INLINABLE switch #-}
1909+ switch = SpiderEvent . switch . (coerce :: Behavior x (R.Event (SpiderTimeline x) a) -> Behavior x (Event x a)) . unSpiderBehavior
1910+ {-# INLINABLE coincidence #-}
1911+ coincidence = SpiderEvent . coincidence . (coerce :: Event x (R.Event (SpiderTimeline x) a) -> Event x (Event x a)) . unSpiderEvent
1912+ {-# INLINABLE current #-}
1913+ current = SpiderBehavior . dynamicCurrent . unSpiderDynamic
1914+ {-# INLINABLE updated #-}
1915+ updated = SpiderEvent . fmap runIdentity . dynamicUpdated . unSpiderDynamic
1916+ {-# INLINABLE unsafeBuildDynamic #-}
1917+ unsafeBuildDynamic readV0 v' = SpiderDynamic $ dynamicDynIdentity $ unsafeDyn (coerce readV0) $ coerce $ unSpiderEvent v'
1918+ {-# INLINABLE unsafeBuildIncremental #-}
1919+ unsafeBuildIncremental readV0 dv = SpiderIncremental $ dynamicDyn $ unsafeDyn (coerce readV0) $ unSpiderEvent dv
1920+ {-# INLINABLE mergeIncremental #-}
1921+ mergeIncremental = SpiderEvent . merge . (unsafeCoerce :: Dynamic x (R.PatchDMap k (R.Event (SpiderTimeline x))) -> Dynamic x (R.PatchDMap k (Event x))) . unSpiderIncremental
1922+ {-# INLINABLE currentIncremental #-}
1923+ currentIncremental = SpiderBehavior . dynamicCurrent . unSpiderIncremental
1924+ {-# INLINABLE updatedIncremental #-}
1925+ updatedIncremental = SpiderEvent . dynamicUpdated . unSpiderIncremental
1926+ {-# INLINABLE incrementalToDynamic #-}
1927+ incrementalToDynamic (SpiderIncremental i) = SpiderDynamic $ dynamicDynIdentity $ unsafeDyn (readBehaviorUntracked $ dynamicCurrent i) $ flip push (dynamicUpdated i) $ \p -> do
1928+ c <- readBehaviorUntracked $ dynamicCurrent i
1929+ return $ Identity <$> R.apply p c --TODO: Avoid the redundant 'apply'
1930+ eventCoercion Coercion = Coercion
1931+ behaviorCoercion Coercion = Coercion
1932+ dynamicCoercion = unsafeCoerce --TODO: How can we avoid this unsafeCoerce? This is safe only because we know how Identity works as a Patch instance
1934+instance HasSpiderTimeline x => R.MonadSample (SpiderTimeline x) (EventM x) where
1935+ {-# INLINABLE sample #-}
1936+ sample (SpiderBehavior b) = readBehaviorUntracked b
1938+instance HasSpiderTimeline x => R.MonadHold (SpiderTimeline x) (EventM x) where
1939+ {-# INLINABLE hold #-}
1940+ hold = holdSpiderEventM
1941+ {-# INLINABLE holdDyn #-}
1942+ holdDyn = holdDynSpiderEventM
1943+ {-# INLINABLE holdIncremental #-}
1944+ holdIncremental = holdIncrementalSpiderEventM
1946+holdSpiderEventM :: HasSpiderTimeline x => a -> R.Event (SpiderTimeline x) a -> EventM x (R.Behavior (SpiderTimeline x) a)
1947+holdSpiderEventM v0 e = fmap (SpiderBehavior . behaviorHoldIdentity) $ hold v0 $ coerce $ unSpiderEvent e
1949+holdDynSpiderEventM :: HasSpiderTimeline x => a -> R.Event (SpiderTimeline x) a -> EventM x (R.Dynamic (SpiderTimeline x) a)
1950+holdDynSpiderEventM v0 e = fmap (SpiderDynamic . dynamicHoldIdentity) $ hold v0 $ coerce $ unSpiderEvent e
1952+holdIncrementalSpiderEventM :: (HasSpiderTimeline x, R.Patch p) => R.PatchTarget p -> R.Event (SpiderTimeline x) p -> EventM x (R.Incremental (SpiderTimeline x) p)
1953+holdIncrementalSpiderEventM v0 e = fmap (SpiderIncremental . dynamicHold) $ hold v0 $ unSpiderEvent e
1955+instance HasSpiderTimeline x => R.MonadHold (SpiderTimeline x) (SpiderHost x) where
1956+ {-# INLINABLE hold #-}
1957+ hold v0 e = R.runHostFrame $ R.hold v0 e
1958+ {-# INLINABLE holdDyn #-}
1959+ holdDyn v0 e = R.runHostFrame $ R.holdDyn v0 e
1960+ {-# INLINABLE holdIncremental #-}
1961+ holdIncremental v0 e = R.runHostFrame $ R.holdIncremental v0 e
1963+instance HasSpiderTimeline x => R.MonadSample (SpiderTimeline x) (SpiderHost x) where
1964+ {-# INLINABLE sample #-}
1965+ sample = runFrame . readBehaviorUntracked . unSpiderBehavior
1967+instance HasSpiderTimeline x => R.MonadSample (SpiderTimeline x) (SpiderPullM x) where
1968+ {-# INLINABLE sample #-}
1969+ sample = coerce . readBehaviorTracked . unSpiderBehavior
1971+instance HasSpiderTimeline x => R.MonadSample (SpiderTimeline x) (SpiderPushM x) where
1972+ {-# INLINABLE sample #-}
1973+ sample (SpiderBehavior b) = SpiderPushM $ readBehaviorUntracked b
1975+instance HasSpiderTimeline x => R.MonadHold (SpiderTimeline x) (SpiderPushM x) where
1976+ {-# INLINABLE hold #-}
1977+ hold v0 e = R.current <$> R.holdDyn v0 e
1978+ {-# INLINABLE holdDyn #-}
1979+ holdDyn v0 (SpiderEvent e) = SpiderPushM $ fmap (SpiderDynamic . dynamicHoldIdentity) $ hold v0 $ coerce e
1980+ {-# INLINABLE holdIncremental #-}
1981+ holdIncremental v0 (SpiderEvent e) = SpiderPushM $ SpiderIncremental . dynamicHold <$> hold v0 e
1983+data RootTrigger x a = forall k. GCompare k => RootTrigger (WeakBag (Subscriber x a), IORef (DMap k Identity), k a)
1985+data SpiderEventHandle x a = SpiderEventHandle
1986+ { spiderEventHandleSubscription :: EventSubscription x
1987+ , spiderEventHandleValue :: IORef (Maybe a)
1990+instance HasSpiderTimeline x => R.MonadSubscribeEvent (SpiderTimeline x) (SpiderHostFrame x) where
1991+ {-# INLINABLE subscribeEvent #-}
1992+ subscribeEvent e = SpiderHostFrame $ do
1993+ --TODO: Unsubscribe eventually (manually and/or with weak ref)
1994+ val <- liftIO $ newIORef Nothing
1995+ subscription <- subscribe (unSpiderEvent e) $ Subscriber
1996+ { subscriberPropagate = \a -> do
1997+ liftIO $ writeIORef val $ Just a
1999+ , subscriberInvalidateHeight = \_ -> return ()
2000+ , subscriberRecalculateHeight = \_ -> return ()
2002+ return $ SpiderEventHandle
2003+ { spiderEventHandleSubscription = subscription
2004+ , spiderEventHandleValue = val
2007+instance HasSpiderTimeline x => R.ReflexHost (SpiderTimeline x) where
2008+ type EventTrigger (SpiderTimeline x) = RootTrigger x
2009+ type EventHandle (SpiderTimeline x) = SpiderEventHandle x
2010+ type HostFrame (SpiderTimeline x) = SpiderHostFrame x
2012+instance HasSpiderTimeline x => R.MonadReadEvent (SpiderTimeline x) (ReadPhase x) where
2013+ {-# NOINLINE readEvent #-}
2014+ readEvent h = ReadPhase $ fmap (fmap return) $ liftIO $ do
2015+ result <- readIORef $ spiderEventHandleValue h
2019+instance MonadRef (EventM x) where
2020+ type Ref (EventM x) = Ref IO
2021+ {-# INLINABLE newRef #-}
2022+ {-# INLINABLE readRef #-}
2023+ {-# INLINABLE writeRef #-}
2024+ newRef = liftIO . newRef
2025+ readRef = liftIO . readRef
2026+ writeRef r a = liftIO $ writeRef r a
2028+instance MonadAtomicRef (EventM x) where
2029+ {-# INLINABLE atomicModifyRef #-}
2030+ atomicModifyRef r f = liftIO $ atomicModifyRef r f
2032+-- | The monad for actions that manipulate a Spider timeline identified by @x@
2033+newtype SpiderHost x a = SpiderHost { unSpiderHost :: ReaderT (SpiderTimeline x) IO a } deriving (Functor, Applicative, MonadFix, MonadIO, MonadException, MonadAsyncException)
2035+instance Monad (SpiderHost x) where
2036+ {-# INLINABLE (>>=) #-}
2037+ SpiderHost x >>= f = SpiderHost $ x >>= unSpiderHost . f
2038+ {-# INLINABLE (>>) #-}
2039+ SpiderHost x >> SpiderHost y = SpiderHost $ x >> y
2040+ {-# INLINABLE return #-}
2041+ return x = SpiderHost $ return x
2042+ {-# INLINABLE fail #-}
2043+ fail s = SpiderHost $ fail s
2045+-- | Run an action affecting the global Spider timeline; this will be guarded by
2046+-- a mutex for that timeline
2047+runSpiderHost :: SpiderHost Global a -> IO a
2048+runSpiderHost (SpiderHost a) = runReaderT a globalSpiderTimeline
2050+-- | Run an action affecting a given Spider timeline; this will be guarded by a
2051+-- mutex for that timeline
2052+runSpiderHostForTimeline :: SpiderHost x a -> SpiderTimeline x -> IO a
2053+runSpiderHostForTimeline (SpiderHost a) = runReaderT a
2055+newtype SpiderHostFrame x a = SpiderHostFrame { runSpiderHostFrame :: EventM x a } deriving (Functor, Applicative, MonadFix, MonadIO, MonadException, MonadAsyncException)
2057+instance Monad (SpiderHostFrame x) where
2058+ {-# INLINABLE (>>=) #-}
2059+ SpiderHostFrame x >>= f = SpiderHostFrame $ x >>= runSpiderHostFrame . f
2060+ {-# INLINABLE (>>) #-}
2061+ SpiderHostFrame x >> SpiderHostFrame y = SpiderHostFrame $ x >> y
2062+ {-# INLINABLE return #-}
2063+ return x = SpiderHostFrame $ return x
2064+ {-# INLINABLE fail #-}
2065+ fail s = SpiderHostFrame $ fail s
2067+instance HasSpiderTimeline x => R.MonadSample (SpiderTimeline x) (SpiderHostFrame x) where
2068+ sample = SpiderHostFrame . readBehaviorUntracked . unSpiderBehavior --TODO: This can cause problems with laziness, so we should get rid of it if we can
2070+instance HasSpiderTimeline x => R.MonadHold (SpiderTimeline x) (SpiderHostFrame x) where
2071+ {-# INLINABLE hold #-}
2072+ hold v0 e = SpiderHostFrame $ fmap (SpiderBehavior . behaviorHoldIdentity) $ hold v0 $ coerce $ unSpiderEvent e
2073+ {-# INLINABLE holdDyn #-}
2074+ holdDyn v0 e = SpiderHostFrame $ fmap (SpiderDynamic . dynamicHoldIdentity) $ hold v0 $ coerce $ unSpiderEvent e
2075+ {-# INLINABLE holdIncremental #-}
2076+ holdIncremental v0 e = SpiderHostFrame $ fmap (SpiderIncremental . dynamicHold) $ hold v0 $ unSpiderEvent e
2078+newEventWithTriggerIO :: (RootTrigger x a -> IO (IO ())) -> IO (Event x a)
2079+newEventWithTriggerIO f = do
2080+ es <- newFanEventWithTriggerIO $ \Refl -> f
2081+ return $ select es Refl
2083+newFanEventWithTriggerIO :: GCompare k => (forall a. k a -> RootTrigger x a -> IO (IO ())) -> IO (EventSelector x k)
2084+newFanEventWithTriggerIO f = do
2085+ occRef <- newIORef DMap.empty
2086+ subscribedRef <- newIORef DMap.empty
2088+ { rootOccurrence = occRef
2089+ , rootSubscribed = subscribedRef
2092+ return $ EventSelector $ \k -> eventRoot k r
2094+instance R.MonadReflexCreateTrigger (SpiderTimeline x) (SpiderHost x) where
2095+ newEventWithTrigger = SpiderHost . lift . fmap SpiderEvent . newEventWithTriggerIO
2096+ newFanEventWithTrigger f = SpiderHost $ lift $ do
2097+ es <- newFanEventWithTriggerIO f
2098+ return $ R.EventSelector $ SpiderEvent . select es
2100+instance R.MonadReflexCreateTrigger (SpiderTimeline x) (SpiderHostFrame x) where
2101+ newEventWithTrigger = SpiderHostFrame . EventM . liftIO . fmap SpiderEvent . newEventWithTriggerIO
2102+ newFanEventWithTrigger f = SpiderHostFrame $ EventM $ liftIO $ do
2103+ es <- newFanEventWithTriggerIO f
2104+ return $ R.EventSelector $ SpiderEvent . select es
2106+instance HasSpiderTimeline x => R.MonadSubscribeEvent (SpiderTimeline x) (SpiderHost x) where
2107+ {-# INLINABLE subscribeEvent #-}
2108+ subscribeEvent = runFrame . runSpiderHostFrame . R.subscribeEvent
2110+newtype ReadPhase x a = ReadPhase (ResultM x a) deriving (Functor, Applicative, Monad, MonadFix)
2112+instance HasSpiderTimeline x => R.MonadSample (SpiderTimeline x) (ReadPhase x) where
2113+ {-# INLINABLE sample #-}
2114+ sample = ReadPhase . R.sample
2116+instance HasSpiderTimeline x => R.MonadHold (SpiderTimeline x) (ReadPhase x) where
2117+ {-# INLINABLE hold #-}
2118+ hold v0 e = ReadPhase $ R.hold v0 e
2119+ {-# INLINABLE holdDyn #-}
2120+ holdDyn v0 e = ReadPhase $ R.holdDyn v0 e
2121+ {-# INLINABLE holdIncremental #-}
2122+ holdIncremental v0 e = ReadPhase $ R.holdIncremental v0 e
2124+instance HasSpiderTimeline x => R.MonadReflexHost (SpiderTimeline x) (SpiderHost x) where
2125+ type ReadPhase (SpiderHost x) = ReadPhase x
2126+ fireEventsAndRead es (ReadPhase a) = run es a
2127+ runHostFrame = runFrame . runSpiderHostFrame
2129+instance MonadRef (SpiderHost x) where
2130+ type Ref (SpiderHost x) = Ref IO
2131+ newRef = SpiderHost . newRef
2132+ readRef = SpiderHost . readRef
2133+ writeRef r = SpiderHost . writeRef r
2135+instance MonadAtomicRef (SpiderHost x) where
2136+ atomicModifyRef r = SpiderHost . atomicModifyRef r
2138+instance MonadRef (SpiderHostFrame x) where
2139+ type Ref (SpiderHostFrame x) = Ref IO
2140+ newRef = SpiderHostFrame . newRef
2141+ readRef = SpiderHostFrame . readRef
2142+ writeRef r = SpiderHostFrame . writeRef r
2144+instance MonadAtomicRef (SpiderHostFrame x) where
2145+ atomicModifyRef r = SpiderHostFrame . atomicModifyRef r
2147+instance PrimMonad (SpiderHostFrame x) where
2148+ type PrimState (SpiderHostFrame x) = PrimState IO
2149+ primitive = SpiderHostFrame . EventM . primitive
2151+--------------------------------------------------------------------------------
2153+--------------------------------------------------------------------------------
2155+{-# DEPRECATED SpiderEnv "Use 'SpiderTimeline' instead" #-}
2156+type SpiderEnv = SpiderTimeline