@@ -1,2260 +0,0 @@
1−{-# LANGUAGE BangPatterns #-}
3−{-# LANGUAGE ConstraintKinds #-}
4−{-# LANGUAGE EmptyDataDecls #-}
5−{-# LANGUAGE ExistentialQuantification #-}
6−{-# LANGUAGE FlexibleContexts #-}
7−{-# LANGUAGE FlexibleInstances #-}
8−{-# LANGUAGE FunctionalDependencies #-}
10−{-# LANGUAGE GeneralizedNewtypeDeriving #-}
11−{-# LANGUAGE LambdaCase #-}
12−{-# LANGUAGE MagicHash #-}
13−{-# LANGUAGE MultiParamTypeClasses #-}
14−{-# LANGUAGE MultiWayIf #-}
15−{-# LANGUAGE RankNTypes #-}
16−{-# LANGUAGE RoleAnnotations #-}
17−{-# LANGUAGE ScopedTypeVariables #-}
18−{-# LANGUAGE TypeFamilies #-}
19−{-# LANGUAGE TypeOperators #-}
20−{-# LANGUAGE UndecidableInstances #-}
21−-- | This module is the implementation of the 'Spider' 'Reflex' engine. It uses
22−-- a graph traversal algorithm to propagate 'Event's and 'Behavior's.
23−module Reflex.Spider.Internal
33−import Control.Applicative
34−import Control.Concurrent
35−import Control.Exception
36−import Control.Monad hiding (forM, forM_, mapM, mapM_, sequence)
37−import Control.Monad.Exception
38−import Control.Monad.Identity hiding (forM, forM_, mapM, mapM_, sequence)
39−import Control.Monad.Primitive
40−import Control.Monad.Reader hiding (forM, forM_, mapM, mapM_, sequence)
41−import Control.Monad.Ref
44−import Data.Dependent.Map (DMap, DSum (..))
45−import qualified Data.Dependent.Map as DMap
46−import Data.Foldable hiding (concat, elem, sequence_)
48−import Data.Functor.Compose
49−import Data.Functor.Constant
50−import Data.Functor.Product
51−import Data.GADT.Compare
52−import Data.IntMap.Strict (IntMap)
53−import qualified Data.IntMap.Strict as IntMap
55−import Data.List hiding (foldl')
57−import Data.Monoid ((<>))
58−import Data.Some (Some)
59−import qualified Data.Some as Some
61−import Data.Traversable
63−import GHC.IORef (IORef (..))
65−import System.IO.Unsafe
66−import System.Mem.Weak
70−import Control.Monad.State hiding (forM, forM_, mapM, mapM_, sequence)
71−import Data.List.NonEmpty (NonEmpty (..), nonEmpty)
72−import qualified Data.List.NonEmpty as NonEmpty
73−import Data.Monoid (mempty)
74−import Data.Tree (Forest, Tree (..), drawForest)
77−import Data.WeakBag (WeakBag, WeakBagTicket)
78−import qualified Data.WeakBag as WeakBag
79−import qualified Reflex.Class as R
80−import qualified Reflex.Host.Class as R
82−-- Note: must come last to silence warnings due to AMP on GHC < 7.10
83−import Prelude hiding (any, concat, mapM, mapM_, sequence)
85−debugPropagate :: Bool
87−debugInvalidateHeight :: Bool
89−debugInvalidate :: Bool
97−debugInvalidateHeight = False
99−debugInvalidate = True
101−class HasNodeId a where
102− getNodeId :: a -> Int
104−instance HasNodeId (Hold x p a) where
105− getNodeId = holdNodeId
107−instance HasNodeId (PushSubscribed x a b) where
108− getNodeId = pushSubscribedNodeId
110−instance HasNodeId (SwitchSubscribed x a) where
111− getNodeId = switchSubscribedNodeId
113−instance HasNodeId (MergeSubscribed x a) where
114− getNodeId = mergeSubscribedNodeId
116−instance HasNodeId (FanSubscribed x a) where
117− getNodeId = fanSubscribedNodeId
119−instance HasNodeId (CoincidenceSubscribed x a) where
120− getNodeId = coincidenceSubscribedNodeId
122−instance HasNodeId (RootSubscribed x a) where
123− getNodeId = rootSubscribedNodeId
125−instance HasNodeId (Pull x a) where
126− getNodeId = pullNodeId
128−{-# INLINE showNodeId #-}
129−showNodeId :: HasNodeId a => a -> String
130−showNodeId = ("#"<>) . show . getNodeId
132−showSubscriberType :: Subscriber x a -> String
133−showSubscriberType = \case
134− SubscriberPush _ _ -> "SubscriberPush"
135− SubscriberMerge _ _ -> "SubscriberMerge"
136− SubscriberFan _ -> "SubscriberFan"
137− SubscriberMergeChange _ -> "SubscriberMergeChange"
138− SubscriberHold _ -> "SubscriberHold"
139− SubscriberHoldIdentity _ -> "SubscriberHoldIdentity"
140− SubscriberSwitch _ -> "SubscriberSwitch"
141− SubscriberCoincidenceOuter _ -> "SubscriberCoincidenceOuter"
142− SubscriberCoincidenceInner _ -> "SubscriberCoincidenceInner"
143− SubscriberHandle -> "SubscriberHandle"
145−showEventType :: Event x a -> String
146−showEventType = \case
147− EventRoot _ _ -> "EventRoot"
148− EventNever -> "EventNever"
149− EventPush _ -> "EventPush"
150− EventMerge _ -> "EventMerge"
151− EventFan _ _ -> "EventFan"
152− EventSwitch _ -> "EventSwitch"
153− EventCoincidence _ -> "EventCoincidence"
154− EventHold _ -> "EventHold"
155− EventDyn _ -> "EventDyn"
156− EventHoldIdentity _ -> "EventHoldIdentity"
157− EventDynIdentity _ -> "EventDynIdentity"
161−debugPropagate = False
163−debugInvalidateHeight = False
165−debugInvalidate = False
167−-- This must be inline, or error messages will cause memory leaks due to retaining the node in question
168−{-# INLINE showNodeId #-}
169−showNodeId :: a -> String
175−{-# NOINLINE nextNodeIdRef #-}
176−nextNodeIdRef :: IORef Int
177−nextNodeIdRef = unsafePerformIO $ newIORef 1
180−newNodeId = atomicModifyIORef' nextNodeIdRef $ \n -> (succ n, n)
182−{-# NOINLINE unsafeNodeId #-}
183−unsafeNodeId :: a -> Int
184−unsafeNodeId a = unsafePerformIO $ do
189−--------------------------------------------------------------------------------
191−--------------------------------------------------------------------------------
193−newtype Event x a = Event { subscribeAndRead :: Subscriber x a -> EventM x (EventSubscription x a, Maybe a) }
195−subscribe :: Event x a -> Subscriber x a -> EventM x (EventSubscription x a)
196−subscribe e s = fst <$> subscribeAndRead e s
199−wrap :: MonadIO m => (t -> EventSubscribed x a) -> (Subscriber x a -> m (WeakBagTicket (Subscriber x a), t, Maybe a)) -> Subscriber x a -> m (EventSubscription x a, Maybe a)
200−wrap tag getSpecificSubscribed sub = do
201− (sln, subd, occ) <- getSpecificSubscribed sub
203− return (EventSubscription (Just sln) es, occ)
205−eventRoot :: GCompare k => k a -> Root x k -> Event x a
206−eventRoot !k !r = Event $ wrap eventSubscribedRoot $ liftIO . getRootSubscribed k r
208−eventNever :: Event x a
209−eventNever = Event $ \_ -> return (EventSubscription Nothing eventSubscribedNever, Nothing)
211−eventPush :: Push x b a -> Event x a
212−eventPush !p = Event $ wrap eventSubscribedPush $ getPushSubscribed p
214−eventMerge :: (GCompare k, a ~ DMap k Identity) => Merge x k -> Event x a
215−eventMerge !m = Event $ wrap eventSubscribedMerge $ getMergeSubscribed m
217−eventFan :: GCompare k => k a -> Fan x k -> Event x a
218−eventFan !k !f = Event $ wrap eventSubscribedFan $ getFanSubscribed k f
220−eventSwitch :: Switch x a -> Event x a
221−eventSwitch !s = Event $ wrap eventSubscribedSwitch $ getSwitchSubscribed s
223−eventCoincidence :: Coincidence x a -> Event x a
224−eventCoincidence !c = Event $ wrap eventSubscribedCoincidence $ getCoincidenceSubscribed c
226−eventHold :: a ~ p b => Hold x p b -> Event x a
227−eventHold !h = Event $ subscribeHoldEvent h
229−eventDyn :: (a ~ p b, R.Patch p) => Dyn x p b -> Event x a
230−eventDyn !j = Event $ \sub -> getDynHold j >>= \h -> subscribeHoldEvent h sub
232−eventHoldIdentity :: (a ~ Identity b) => Hold x Identity b -> Event x a
233−eventHoldIdentity !h = Event $ subscribeHoldEvent h
235−eventDynIdentity :: (a ~ Identity b) => Dyn x Identity b -> Event x a
236−eventDynIdentity !j = Event $ \sub -> getDynHold j >>= \h -> subscribeHoldEvent h sub
238−{-# INLINE subscribeCoincidenceInner #-}
239−subscribeCoincidenceInner :: CanSubscribe x m => Event x a -> Height -> CoincidenceSubscribed x a -> m (Maybe a, Height, EventSubscribed x a)
240−subscribeCoincidenceInner inner outerHeight subscribedUnsafe = do
241− subInner <- liftIO $ newSubscriberCoincidenceInner subscribedUnsafe
242− (subscription@(EventSubscription _ innerSubd), innerOcc) <- subscribeAndRead inner subInner
243− innerHeight <- liftIO $ getEventSubscribedHeight innerSubd
244− let height = max innerHeight outerHeight
245− defer $ SomeResetCoincidence subscription $ if height > outerHeight then Just subscribedUnsafe else Nothing
246− return (innerOcc, height, innerSubd)
248−--------------------------------------------------------------------------------
250−--------------------------------------------------------------------------------
252−data Subscriber x a = Subscriber
253− { subscriberPropagate :: !(a -> EventM x ())
254− , subscriberInvalidateHeight :: !(Height -> IO ())
255− , subscriberRecalculateHeight :: !(Height -> IO ())
258−--TODO: Move this comment to WeakBag
259−-- These function are constructor functions that are marked NOINLINE so they are
260−-- opaque to GHC. If we do not do this, then GHC will sometimes fuse the constructor away
261−-- so any weak references that are attached to the constructors will have their
262−-- finalizer run. Using the opaque constructor, does not see the
263−-- constructor application, so it behaves like an IORef and cannot be fused away.
265−-- The result is also evaluated to WHNF, since forcing a thunk invalidates
266−-- the weak pointer to it in some cases.
268−newSubscriberPush :: (a -> ComputeM x (Maybe b)) -> PushSubscribed x a b -> IO (Subscriber x a)
269−newSubscriberPush compute subscribed = return $ Subscriber
270− { subscriberPropagate = \a -> {-# SCC "traversePush" #-} do
271− tracePropagate $ "SubscriberPush" <> showNodeId subscribed
272− occ <- runComputeM $ compute a
274− Nothing -> return () -- No need to write a Nothing back into the Ref
276− liftIO $ writeIORef (pushSubscribedOccurrence subscribed) occ
277− scheduleClear $ pushSubscribedOccurrence subscribed
278− propagate o $ pushSubscribedSubscribers subscribed
279− , subscriberInvalidateHeight = \old -> do
280− when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberPush" <> showNodeId subscribed
281− WeakBag.traverse (pushSubscribedSubscribers subscribed) $ invalidateSubscriberHeight old
282− when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberPush" <> showNodeId subscribed <> " done"
283− , subscriberRecalculateHeight = \new -> do
284− when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberPush" <> showNodeId subscribed
285− WeakBag.traverse (pushSubscribedSubscribers subscribed) $ recalculateSubscriberHeight new
286− when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberPush" <> showNodeId subscribed <> " done"
289−newSubscriberHold :: R.Patch p => Hold x p a -> IO (Subscriber x (p a))
290−newSubscriberHold h = return $ Subscriber
291− { subscriberPropagate = {-# SCC "traverseHold" #-} propagateSubscriberHold h
292− , subscriberInvalidateHeight = \_ -> return ()
293− , subscriberRecalculateHeight = \_ -> return ()
296−newSubscriberMerge :: GCompare k => k a -> MergeSubscribed x k -> IO (Subscriber x a)
297−newSubscriberMerge k subscribed = return $ Subscriber
298− { subscriberPropagate = \a -> {-# SCC "traverseMerge" #-} do
299− tracePropagate $ "SubscriberMerge" <> showNodeId subscribed
300− oldM <- liftIO $ readIORef $ mergeSubscribedAccum subscribed
301− let newM = DMap.insertWith (error $ "Same key fired multiple times for Merge" <> showNodeId subscribed) k (Identity a) oldM
302− tracePropagate $ " DMap.size oldM = " <> show (DMap.size oldM) <> "; DMap.size newM = " <> show (DMap.size newM)
303− liftIO $ writeIORef (mergeSubscribedAccum subscribed) $! newM
304− when (DMap.null oldM) $ do -- Only schedule the firing once
305− height <- liftIO $ readIORef $ mergeSubscribedHeight subscribed
306− --TODO: assertions about height
307− currentHeight <- getCurrentHeight
308− when (height <= currentHeight) $ do
309− if height /= invalidHeight
311− myStack <- liftIO $ whoCreatedIORef $ mergeSubscribedCachedSubscribed subscribed
312− error $ "Height (" ++ show height ++ ") is not greater than current height (" ++ show currentHeight ++ ")\n" ++ unlines (reverse myStack)
315− nodesInvolvedInCycle <- walkInvalidHeightParents $ eventSubscribedMerge subscribed
316− stacks <- forM nodesInvolvedInCycle $ \(Some.This es) -> whoCreatedEventSubscribed es
317− let cycleInfo = ":\n" <> drawForest (listsToForest stacks)
321− error $ "Causality loop found" <> cycleInfo
322− scheduleMerge height subscribed
323− , subscriberInvalidateHeight = \old -> do
324− when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberMerge" <> showNodeId subscribed
325− removeMergeHeight old subscribed
326− invalidateMergeHeight subscribed
327− when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberMerge" <> showNodeId subscribed <> " done"
328− , subscriberRecalculateHeight = \new -> do
329− when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberMerge" <> showNodeId subscribed
330− addMergeHeight new subscribed
331− revalidateMergeHeight subscribed
332− when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberMerge" <> showNodeId subscribed <> " done"
335−newSubscriberMergeChange :: GCompare k => MergeSubscribed x k -> IO (Subscriber x (R.PatchDMap (DMap k (Event x))))
336−newSubscriberMergeChange subscribed = return $ Subscriber
337− { subscriberPropagate = \a -> {-# SCC "traverseMergeChange" #-} do
338− tracePropagate $ "SubscriberMerge" <> showNodeId subscribed
339− defer $ SomeMergeUpdate a subscribed
340− , subscriberInvalidateHeight = \_ -> return ()
341− , subscriberRecalculateHeight = \_ -> return ()
344−newSubscriberFan :: GCompare k => FanSubscribed x k -> IO (Subscriber x (DMap k Identity))
345−newSubscriberFan subscribed = return $ Subscriber
346− { subscriberPropagate = \a -> {-# SCC "traverseFan" #-} do
347− subs <- liftIO $ readIORef $ fanSubscribedSubscribers subscribed
348− tracePropagate $ "SubscriberFan" <> showNodeId subscribed <> ": " ++ show (DMap.size subs) ++ " keys subscribed, " ++ show (DMap.size a) ++ " keys firing"
349− liftIO $ writeIORef (fanSubscribedOccurrence subscribed) $ Just a
350− scheduleClear $ fanSubscribedOccurrence subscribed
351− let f _ (Pair (Identity v) subsubs) = do
352− propagate v $ _fanSubscribedChildren_list subsubs
353− return $ Constant ()
354− _ <- DMap.traverseWithKey f $ DMap.intersectionWithKey (\_ -> Pair) a subs --TODO: Would be nice to have DMap.traverse_
356− , subscriberInvalidateHeight = \old -> do
357− when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberFan" <> showNodeId subscribed
358− subscribers <- readIORef $ fanSubscribedSubscribers subscribed
359− forM_ (DMap.toList subscribers) $ \(_ :=> v) -> WeakBag.traverse (_fanSubscribedChildren_list v) $ invalidateSubscriberHeight old
360− when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberFan" <> showNodeId subscribed <> " done"
361− , subscriberRecalculateHeight = \new -> do
362− when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberFan" <> showNodeId subscribed
363− subscribers <- readIORef $ fanSubscribedSubscribers subscribed
364− forM_ (DMap.toList subscribers) $ \(_ :=> v) -> WeakBag.traverse (_fanSubscribedChildren_list v) $ recalculateSubscriberHeight new
365− when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberFan" <> showNodeId subscribed <> " done"
368−newSubscriberSwitch :: SwitchSubscribed x a -> IO (Subscriber x a)
369−newSubscriberSwitch subscribed = return $ Subscriber
370− { subscriberPropagate = \a -> {-# SCC "traverseSwitch" #-} do
371− tracePropagate $ "SubscriberSwitch" <> showNodeId subscribed
372− liftIO $ writeIORef (switchSubscribedOccurrence subscribed) $ Just a
373− scheduleClear $ switchSubscribedOccurrence subscribed
374− propagate a $ switchSubscribedSubscribers subscribed
375− , subscriberInvalidateHeight = \_ -> do
376− when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberSwitch" <> showNodeId subscribed
377− oldHeight <- readIORef $ switchSubscribedHeight subscribed
378− when (oldHeight /= invalidHeight) $ do
379− writeIORef (switchSubscribedHeight subscribed) $! invalidHeight
380− WeakBag.traverse (switchSubscribedSubscribers subscribed) $ invalidateSubscriberHeight oldHeight
381− when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberSwitch" <> showNodeId subscribed <> " done"
382− , subscriberRecalculateHeight = \new -> do
383− when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberSwitch" <> showNodeId subscribed
384− updateSwitchHeight new subscribed
385− when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberSwitch" <> showNodeId subscribed <> " done"
388−newSubscriberCoincidenceOuter :: CoincidenceSubscribed x b -> IO (Subscriber x (Event x b))
389−newSubscriberCoincidenceOuter subscribed = return $ Subscriber
390− { subscriberPropagate = \a -> {-# SCC "traverseCoincidenceOuter" #-} do
391− tracePropagate $ "SubscriberCoincidenceOuter" <> showNodeId subscribed
392− outerHeight <- liftIO $ readIORef $ coincidenceSubscribedHeight subscribed
393− tracePropagate $ " outerHeight = " <> show outerHeight
394− (occ, innerHeight, innerSubd) <- subscribeCoincidenceInner a outerHeight subscribed
395− tracePropagate $ " isJust occ = " <> show (isJust occ)
396− tracePropagate $ " innerHeight = " <> show innerHeight
397− liftIO $ writeIORef (coincidenceSubscribedInnerParent subscribed) $ Just innerSubd
398− scheduleClear $ coincidenceSubscribedInnerParent subscribed
401− when (innerHeight > outerHeight) $ liftIO $ do -- If the event fires, it will fire at a later height
402− writeIORef (coincidenceSubscribedHeight subscribed) $! innerHeight
403− WeakBag.traverse (coincidenceSubscribedSubscribers subscribed) $ invalidateSubscriberHeight outerHeight
404− WeakBag.traverse (coincidenceSubscribedSubscribers subscribed) $ recalculateSubscriberHeight innerHeight
405− Just o -> do -- Since it's already firing, no need to adjust height
406− liftIO $ writeIORef (coincidenceSubscribedOccurrence subscribed) occ
407− scheduleClear $ coincidenceSubscribedOccurrence subscribed
408− propagate o $ coincidenceSubscribedSubscribers subscribed
409− , subscriberInvalidateHeight = \_ -> do
410− when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberCoincidenceOuter" <> showNodeId subscribed
411− invalidateCoincidenceHeight subscribed
412− when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberCoincidenceOuter" <> showNodeId subscribed <> " done"
413− , subscriberRecalculateHeight = \_ -> do
414− when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberCoincidenceOuter" <> showNodeId subscribed
415− recalculateCoincidenceHeight subscribed
416− when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberCoincidenceOuter" <> showNodeId subscribed <> " done"
419−newSubscriberCoincidenceInner :: CoincidenceSubscribed x a -> IO (Subscriber x a)
420−newSubscriberCoincidenceInner subscribed = return $ Subscriber
421− { subscriberPropagate = \a -> {-# SCC "traverseCoincidenceInner" #-} do
422− tracePropagate $ "SubscriberCoincidenceInner" <> showNodeId subscribed
423− occ <- liftIO $ readIORef $ coincidenceSubscribedOccurrence subscribed
425− Just _ -> return () -- SubscriberCoincidenceOuter must have already propagated this event
427− liftIO $ writeIORef (coincidenceSubscribedOccurrence subscribed) $ Just a
428− scheduleClear $ coincidenceSubscribedOccurrence subscribed
429− propagate a $ coincidenceSubscribedSubscribers subscribed
430− , subscriberInvalidateHeight = \_ -> do
431− when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberCoincidenceInner" <> showNodeId subscribed
432− invalidateCoincidenceHeight subscribed
433− when debugInvalidateHeight $ putStrLn $ "invalidateSubscriberHeight: SubscriberCoincidenceInner" <> showNodeId subscribed <> " done"
434− , subscriberRecalculateHeight = \_ -> do
435− when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberCoincidenceInner" <> showNodeId subscribed
436− recalculateCoincidenceHeight subscribed
437− when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: SubscriberCoincidenceInner" <> showNodeId subscribed <> " done"
440−invalidateSubscriberHeight :: Height -> Subscriber x a -> IO ()
441−invalidateSubscriberHeight = flip subscriberInvalidateHeight
443−recalculateSubscriberHeight :: Height -> Subscriber x a -> IO ()
444−recalculateSubscriberHeight = flip subscriberRecalculateHeight
446−-- | Propagate everything at the current height
447−propagate :: a -> WeakBag (Subscriber x a) -> EventM x ()
448−propagate a subscribers = withIncreasedDepth $ do
449− -- 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
450− --TODO: Should we check if nodes already have their values before propagating? Maybe we're re-doing work
451− WeakBag.traverse subscribers $ \s -> subscriberPropagate s a
453−--------------------------------------------------------------------------------
455−--------------------------------------------------------------------------------
457−data EventSubscribed x a = forall b. EventSubscribed
458− { eventSubscribedHeightRef :: {-# UNPACK #-} !(IORef Height)
459− , eventSubscribedRetained :: {-# NOUNPACK #-} !b
461− , eventSubscribedGetParents :: !(IO [Some (EventSubscribed x)]) -- For debugging loops
462− , eventSubscribedHasOwnHeightRef :: !Bool
463− , eventSubscribedWhoCreated :: !(IO [String])
467−eventSubscribedRoot :: RootSubscribed x a -> EventSubscribed x a
468−eventSubscribedRoot !r = EventSubscribed
469− { eventSubscribedHeightRef = zeroRef
470− , eventSubscribedRetained = r
472− , eventSubscribedGetParents = return []
473− , eventSubscribedHasOwnHeightRef = False
474− , eventSubscribedWhoCreated = return ["root"]
478−eventSubscribedNever :: EventSubscribed x a
479−eventSubscribedNever = EventSubscribed
480− { eventSubscribedHeightRef = zeroRef
481− , eventSubscribedRetained = ()
483− , eventSubscribedGetParents = return []
484− , eventSubscribedHasOwnHeightRef = False
485− , eventSubscribedWhoCreated = return ["never"]
489−eventSubscribedPush :: PushSubscribed x b a -> EventSubscribed x a
490−eventSubscribedPush !subscribed = EventSubscribed
491− { eventSubscribedHeightRef = pushSubscribedHeight subscribed
492− , eventSubscribedRetained = subscribed
494− , eventSubscribedGetParents = return [Some.This $ _eventSubscription_subscribed $ pushSubscribedParent subscribed]
495− , eventSubscribedHasOwnHeightRef = False
496− , eventSubscribedWhoCreated = whoCreatedIORef $ pushSubscribedCachedSubscribed subscribed
500−eventSubscribedMerge :: MergeSubscribed x k -> EventSubscribed x a
501−eventSubscribedMerge !subscribed = EventSubscribed
502− { eventSubscribedHeightRef = mergeSubscribedHeight subscribed
503− , eventSubscribedRetained = subscribed
505− , eventSubscribedGetParents = do
506− ps <- readIORef $ mergeSubscribedParents subscribed
507− return $ R.ffor (DMap.toList ps) $ \(_ :=> v) -> Some.This $ _eventSubscription_subscribed $ mergeSubscribedParentSubscription v
508− , eventSubscribedHasOwnHeightRef = True
509− , eventSubscribedWhoCreated = whoCreatedIORef $ mergeSubscribedCachedSubscribed subscribed
513−eventSubscribedFan :: FanSubscribed x k -> EventSubscribed x a
514−eventSubscribedFan !subscribed = EventSubscribed
515− { eventSubscribedHeightRef = eventSubscribedHeightRef $ _eventSubscription_subscribed $ fanSubscribedParent subscribed
516− , eventSubscribedRetained = subscribed
518− , eventSubscribedGetParents = return [Some.This $ _eventSubscription_subscribed $ fanSubscribedParent subscribed]
519− , eventSubscribedHasOwnHeightRef = False
520− , eventSubscribedWhoCreated = whoCreatedIORef $ fanSubscribedCachedSubscribed subscribed
524−eventSubscribedSwitch :: SwitchSubscribed x a -> EventSubscribed x a
525−eventSubscribedSwitch !subscribed = EventSubscribed
526− { eventSubscribedHeightRef = switchSubscribedHeight subscribed
527− , eventSubscribedRetained = subscribed
529− , eventSubscribedGetParents = do
530− s <- readIORef $ switchSubscribedCurrentParent subscribed
531− return [Some.This $ _eventSubscription_subscribed s]
532− , eventSubscribedHasOwnHeightRef = True
533− , eventSubscribedWhoCreated = whoCreatedIORef $ switchSubscribedCachedSubscribed subscribed
537−eventSubscribedCoincidence :: CoincidenceSubscribed x a -> EventSubscribed x a
538−eventSubscribedCoincidence !subscribed = EventSubscribed
539− { eventSubscribedHeightRef = coincidenceSubscribedHeight subscribed
540− , eventSubscribedRetained = subscribed
542− , eventSubscribedGetParents = do
543− innerSubscription <- readIORef $ coincidenceSubscribedInnerParent subscribed
544− let outerParent = Some.This $ _eventSubscription_subscribed $ coincidenceSubscribedOuterParent subscribed
545− innerParents = maybeToList $ fmap Some.This innerSubscription
546− return $ outerParent : innerParents
547− , eventSubscribedHasOwnHeightRef = True
548− , eventSubscribedWhoCreated = whoCreatedIORef $ coincidenceSubscribedCachedSubscribed subscribed
552−getEventSubscribedHeight :: EventSubscribed x a -> IO Height
553−getEventSubscribedHeight es = readIORef $ eventSubscribedHeightRef es
556−whoCreatedEventSubscribed :: EventSubscribed x a -> IO [String]
557−whoCreatedEventSubscribed = eventSubscribedWhoCreated
559−walkInvalidHeightParents :: EventSubscribed x a -> IO [Some (EventSubscribed x)]
560−walkInvalidHeightParents s0 = do
561− subscribers <- flip execStateT mempty $ ($ Some.This s0) $ fix $ \loop (Some.This s) -> do
562− h <- liftIO $ readIORef $ eventSubscribedHeightRef s
563− when (h == invalidHeight) $ do
564− when (eventSubscribedHasOwnHeightRef s) $ liftIO $ writeIORef (eventSubscribedHeightRef s) $! invalidHeightBeingTraversed
565− modify (Some.This s :)
566− mapM_ loop =<< liftIO (eventSubscribedGetParents s)
567− forM_ subscribers $ \(Some.This s) -> writeIORef (eventSubscribedHeightRef s) $! invalidHeight
571−{-# INLINE subscribeHoldEvent #-}
572−subscribeHoldEvent :: CanSubscribe x m => Hold x p a -> Subscriber x (p a) -> m (EventSubscription x (p a), Maybe (p a))
573−subscribeHoldEvent = subscribeAndRead . holdEvent
575−--------------------------------------------------------------------------------
577−--------------------------------------------------------------------------------
579−data EventSubscription x a = EventSubscription
580− { _eventSubscription_ticket :: !(Maybe (WeakBagTicket (Subscriber x a)))
581− , _eventSubscription_subscribed :: !(EventSubscribed x a)
584−unsubscribe :: EventSubscription x a -> IO ()
585−unsubscribe (EventSubscription msln _) = forM_ msln $ \sln -> WeakBag.remove sln
587−--------------------------------------------------------------------------------
589−--------------------------------------------------------------------------------
591−--TODO: Figure out why certain things are not 'representational', then make them
592−--representational so we can use coerce
594−--type role Hold representational
596− = Hold { holdValue :: !(IORef a)
597− , holdInvalidators :: !(IORef [Weak (Invalidator x)])
598− , holdEvent :: !(Event x (p a))
599− , holdParent :: !(IORef (Maybe (EventSubscription x (p a)))) -- Keeps its parent alive (will be undefined until the hold is initialized) --TODO: Probably shouldn't be an IORef
606− = EventEnv { eventEnvSpiderEnv :: !(SpiderEnv x)
607− , eventEnvAssignments :: !(IORef [SomeAssignment x]) -- Needed for Subscribe
608− , eventEnvHoldInits :: !(IORef [SomeHoldInit x]) -- Needed for Subscribe
609− , eventEnvMergeUpdates :: !(IORef [SomeMergeUpdate x])
610− , eventEnvMergeInits :: !(IORef [SomeMergeInit x]) -- Needed for Subscribe
611− , eventEnvClears :: !(IORef [SomeClear]) -- Needed for Subscribe
612− , eventEnvRootClears :: !(IORef [SomeRootClear])
613− , eventEnvCurrentHeight :: !(IORef Height) -- Needed for Subscribe
614− , eventEnvResetCoincidences :: !(IORef [SomeResetCoincidence x]) -- Needed for Subscribe
615− , eventEnvDelayedMerges :: !(IORef (IntMap [DelayedMerge x]))
618−{-# INLINE runEventM #-}
619−runEventM :: EventM x a -> EventEnv x -> IO a
620−runEventM = runReaderT . unEventM
622−class MonadIO m => Defer a m where
623− getDeferralQueue :: m (IORef [a])
626−defer :: Defer a m => a -> m ()
628− q <- getDeferralQueue
629− liftIO $ modifyIORef' q (a:)
631−instance Defer (SomeAssignment x) (EventM x) where
632− {-# INLINE getDeferralQueue #-}
633− getDeferralQueue = EventM $ asks eventEnvAssignments
635−instance Defer (SomeHoldInit x) (EventM x) where
636− {-# INLINE getDeferralQueue #-}
637− getDeferralQueue = EventM $ asks eventEnvHoldInits
639−instance Defer (SomeHoldInit x) (BehaviorM x) where
640− {-# INLINE getDeferralQueue #-}
641− getDeferralQueue = BehaviorM $ asks snd
643−instance Defer (SomeMergeUpdate x) (EventM x) where
644− {-# INLINE getDeferralQueue #-}
645− getDeferralQueue = EventM $ asks eventEnvMergeUpdates
647−instance Defer (SomeMergeInit x) (EventM x) where
648− {-# INLINE getDeferralQueue #-}
649− getDeferralQueue = EventM $ asks eventEnvMergeInits
651−class HasCurrentHeight x m | m -> x where
652− getCurrentHeight :: m Height
653− scheduleMerge :: Height -> MergeSubscribed x a -> m ()
655−instance HasCurrentHeight x (EventM x) where
656− {-# INLINE getCurrentHeight #-}
657− getCurrentHeight = EventM $ do
658− heightRef <- asks eventEnvCurrentHeight
659− liftIO $ readIORef heightRef
660− {-# INLINE scheduleMerge #-}
661− scheduleMerge height subscribed = EventM $ do
662− delayedRef <- asks eventEnvDelayedMerges
663− liftIO $ modifyIORef' delayedRef $ IntMap.insertWith (++) (unHeight height) [DelayedMerge subscribed]
665−class HasSpiderEnv x m | m -> x where
666− -- | Retrieve the current SpiderEnv
667− askSpiderEnv :: m (SpiderEnv x)
669−instance HasSpiderEnv x (EventM x) where
670− {-# INLINE askSpiderEnv #-}
671− askSpiderEnv = EventM $ asks eventEnvSpiderEnv
673−instance HasSpiderEnv x (SpiderHost x) where
674− {-# INLINE askSpiderEnv #-}
675− askSpiderEnv = SpiderHost ask
677−putCurrentHeight :: Height -> EventM x ()
678−putCurrentHeight h = EventM $ do
679− heightRef <- asks eventEnvCurrentHeight
680− liftIO $ writeIORef heightRef $! h
682−instance Defer SomeClear (EventM x) where
683− {-# INLINE getDeferralQueue #-}
684− getDeferralQueue = EventM $ asks eventEnvClears
686−{-# INLINE scheduleClear #-}
687−scheduleClear :: Defer SomeClear m => IORef (Maybe a) -> m ()
688−scheduleClear r = defer $ SomeClear r
690−instance Defer SomeRootClear (EventM x) where
691− {-# INLINE getDeferralQueue #-}
692− getDeferralQueue = EventM $ asks eventEnvRootClears
694−{-# INLINE scheduleRootClear #-}
695−scheduleRootClear :: Defer SomeRootClear m => IORef (DMap k Identity) -> m ()
696−scheduleRootClear r = defer $ SomeRootClear r
698−instance Defer (SomeResetCoincidence x) (EventM x) where
699− {-# INLINE getDeferralQueue #-}
700− getDeferralQueue = EventM $ asks eventEnvResetCoincidences
702−-- Note: hold cannot examine its event until after the phase is over
703−{-# SPECIALIZE hold :: R.Patch p => a -> Event x (p a) -> EventM x (Hold x p a) #-}
704−{-# SPECIALIZE hold :: R.Patch p => a -> Event x (p a) -> ComputeM x (Hold x p a) #-}
705−hold :: (R.Patch p, Defer (SomeHoldInit x) m) => a -> Event x (p a) -> m (Hold x p a)
707− valRef <- liftIO $ newIORef v0
708− invsRef <- liftIO $ newIORef []
709− parentRef <- liftIO $ newIORef Nothing
711− nodeId <- liftIO newNodeId
714− { holdValue = valRef
715− , holdInvalidators = invsRef
717− , holdParent = parentRef
719− , holdNodeId = nodeId
722− defer $ SomeHoldInit h
725−{-# INLINE getHoldEventSubscription #-}
726−getHoldEventSubscription :: forall m p a 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, HasSpiderEnv x m, m ~ EventM x) => Hold x p a -> m (EventSubscription x (p a))
727−getHoldEventSubscription h = do
728− ep <- liftIO $ readIORef $ holdParent h
730− Just subd -> return subd
733− subscriptionRef <- liftIO $ newIORef $ error "getHoldEventSubscription: subdRef uninitialized"
734− (subscription@(EventSubscription _ _), occ) <- subscribeAndRead e =<< liftIO (newSubscriberHold h)
735− liftIO $ writeIORef subscriptionRef $! subscription
737− Nothing -> return ()
739− old <- liftIO $ readIORef $ holdValue h
740− case R.apply o old of
741− Nothing -> return ()
743− -- Need to evaluate these so that we don't retain the Hold itself
744− v <- liftIO $ evaluate $ holdValue h
745− i <- liftIO $ evaluate $ holdInvalidators h
746− defer $ SomeAssignment v i new
747− liftIO $ writeIORef (holdParent h) $ Just subscription
750−type BehaviorEnv x = (Maybe (Weak (Invalidator x), IORef [SomeBehaviorSubscribed x]), IORef [SomeHoldInit x])
752−--type role BehaviorM representational
753−-- BehaviorM can sample behaviors
754−newtype BehaviorM x a = BehaviorM { unBehaviorM :: ReaderT (BehaviorEnv x) IO a } deriving (Functor, Applicative, MonadIO, MonadFix)
756−instance Monad (BehaviorM x) where
757− {-# INLINE (>>=) #-}
758− BehaviorM x >>= f = BehaviorM $ x >>= unBehaviorM . f
760− BehaviorM x >> BehaviorM y = BehaviorM $ x >> y
761− {-# INLINE return #-}
762− return x = BehaviorM $ return x
764− fail s = BehaviorM $ fail s
766−data BehaviorSubscribed x a
767− = forall p. BehaviorSubscribedHold (Hold x p a)
768− | BehaviorSubscribedPull (PullSubscribed x a)
770−data SomeBehaviorSubscribed x = forall a. SomeBehaviorSubscribed (BehaviorSubscribed x a)
772−--type role PullSubscribed representational
773−data PullSubscribed x a
774− = PullSubscribed { pullSubscribedValue :: !a
775− , pullSubscribedInvalidators :: !(IORef [Weak (Invalidator x)])
776− , pullSubscribedOwnInvalidator :: !(Invalidator x)
777− , pullSubscribedParents :: ![SomeBehaviorSubscribed x] -- Need to keep parent behaviors alive, or they won't let us know when they're invalidated
780−--type role Pull representational
782− = Pull { pullValue :: !(IORef (Maybe (PullSubscribed x a)))
783− , pullCompute :: !(BehaviorM x a)
790− = forall a. InvalidatorPull (Pull x a)
791− | forall a. InvalidatorSwitch (SwitchSubscribed x a)
793−data RootSubscribed x a = forall k. GCompare k => RootSubscribed
794− { rootSubscribedKey :: !(k a)
795− , rootSubscribedCachedSubscribed :: !(IORef (DMap k (RootSubscribed x))) -- From the original Root
796− , rootSubscribedSubscribers :: !(WeakBag (Subscriber x a))
797− , rootSubscribedOccurrence :: !(IO (Maybe a)) -- Lookup from rootOccurrence
798− , rootSubscribedUninit :: IO ()
799− , 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?
801− , rootSubscribedNodeId :: Int
805−data Root x (k :: * -> *)
806− = Root { rootOccurrence :: !(IORef (DMap k Identity)) -- The currently-firing occurrence of this event
807− , rootSubscribed :: !(IORef (DMap k (RootSubscribed x)))
808− , rootInit :: !(forall a. k a -> RootTrigger x a -> IO (IO ()))
811−data SomeHoldInit x = forall p a. R.Patch p => SomeHoldInit !(Hold x p a)
813−data SomeMergeUpdate x = forall k. GCompare k => SomeMergeUpdate (R.PatchDMap (DMap k (Event x))) (MergeSubscribed x k)
815−data SomeMergeInit x = forall k. GCompare k => SomeMergeInit !(MergeSubscribed x k) !(Event x (R.PatchDMap (DMap k (Event x))))
817−data SomeEventSubscription x = forall a. SomeEventSubscription (EventSubscription x a)
819−-- EventM can do everything BehaviorM can, plus create holds
820−newtype EventM x (a :: *) = EventM { unEventM :: ReaderT (EventEnv x) 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
822−data PushSubscribed x a b
823− = PushSubscribed { pushSubscribedCachedSubscribed :: !(IORef (Maybe (PushSubscribed x a b)))
824− , pushSubscribedOccurrence :: !(IORef (Maybe b)) -- If the current height is less than our height, this should always be Nothing; during our height, this will get filled in at some point, always before our children are notified; after our height, this will be filled in with the correct value (Nothing if we are not firing, Just if we are)
825− , pushSubscribedHeight :: !(IORef Height)
826− , pushSubscribedSubscribers :: !(WeakBag (Subscriber x b))
827− , pushSubscribedSelf :: !(Subscriber x a) -- Hold this in memory to ensure our WeakReferences don't die --TODO: Probably unneeded now
828− , pushSubscribedWeakSelf :: !(IORef (Weak (PushSubscribed x a b)))
829− , pushSubscribedParent :: !(EventSubscription x a)
831− , pushSubscribedNodeId :: Int
835−newtype ComputeM x a = ComputeM (ReaderT (IORef [SomeHoldInit x]) IO a) deriving (Functor, Applicative, Monad, MonadIO, MonadFix)
837−instance Defer (SomeHoldInit x) (ComputeM x) where
838− getDeferralQueue = ComputeM ask
840−{-# SPECIALIZE runComputeM :: ComputeM x a -> EventM x a #-}
841−runComputeM :: Defer (SomeHoldInit x) m => ComputeM x a -> m a
842−runComputeM (ComputeM a) = liftIO . runReaderT a =<< getDeferralQueue
845− = Push { pushCompute :: !(a -> ComputeM x (Maybe b)) -- Compute the current firing value; assumes that its parent has been computed --TODO: This only uses Defer SomeHoldInit EventM; perhaps only the hold init queue should be passed in (also, perhaps those hold inits can be accelerated - can there be a loop we would need to worry about?)
846− , pushParent :: !(Event x a)
847− , pushSubscribed :: !(IORef (Maybe (PushSubscribed x a b))) --TODO: Can we replace this with an unsafePerformIO thunk?
850−data MergeSubscribedParent (x :: *) k a = MergeSubscribedParent !(EventSubscription x a) !(Subscriber x a)
852−mergeSubscribedParentSubscription :: MergeSubscribedParent x k a -> EventSubscription x a
853−mergeSubscribedParentSubscription (MergeSubscribedParent es _) = es
855−data HeightBag = HeightBag
856− { _heightBag_size :: {-# UNPACK #-} !Int
857− , _heightBag_contents :: !(IntMap Word) -- Number of excess in each bucket
859− deriving (Show, Read, Eq, Ord)
861−heightBagEmpty :: HeightBag
862−heightBagEmpty = heightBagVerify $ HeightBag 0 IntMap.empty
864−heightBagSize :: HeightBag -> Int
865−heightBagSize = _heightBag_size
867−heightBagFromList :: [Height] -> HeightBag
868−heightBagFromList heights = heightBagVerify $ foldl' (flip heightBagAdd) heightBagEmpty heights
870−heightBagAdd :: Height -> HeightBag -> HeightBag
871−heightBagAdd (Height h) (HeightBag s c) = heightBagVerify $ HeightBag (succ s) $ IntMap.insertWithKey (\_ _ old -> succ old) h 0 c
873−heightBagRemove :: Height -> HeightBag -> HeightBag
874−heightBagRemove (Height h) b@(HeightBag s c) = heightBagVerify $ case IntMap.lookup h c of
875− Nothing -> error $ "heightBagRemove: Height " <> show h <> " not present in bag " <> show b
876− Just old -> HeightBag (pred s) $ case old of
877− 0 -> IntMap.delete h c
878− _ -> IntMap.insert h (pred old) c
880−heightBagMax :: HeightBag -> Height
881−heightBagMax (HeightBag _ c) = case IntMap.maxViewWithKey c of
882− Just ((h, _), _) -> Height h
883− Nothing -> zeroHeight
885−heightBagVerify :: HeightBag -> HeightBag
887−heightBagVerify b@(HeightBag s c) = if
888− | s /= IntMap.size c + fromIntegral (sum (IntMap.elems c))
889− -> error $ "heightBagVerify: size doesn't match: " <> show b
890− | unHeight invalidHeight `IntMap.member` c
891− -> error $ "heightBagVerify: contains invalid height: " <> show b
897−data MergeSubscribed x k
898− = MergeSubscribed { mergeSubscribedCachedSubscribed :: !(IORef (Maybe (MergeSubscribed x k))) -- From the original merge
899− , mergeSubscribedOccurrence :: !(IORef (Maybe (DMap k Identity)))
900− , mergeSubscribedAccum :: !(IORef (DMap k Identity)) -- This will accumulate occurrences until our height is reached, at which point it will be transferred to mergeSubscribedOccurrence
901− , mergeSubscribedHeight :: !(IORef Height)
902− , mergeSubscribedHeightBag :: !(IORef HeightBag)
903− , mergeSubscribedSubscribers :: !(WeakBag (Subscriber x (DMap k Identity)))
904− , mergeSubscribedChange :: !(IORef (Subscriber x (R.PatchDMap (DMap k (Event x))), EventSubscribed x (R.PatchDMap (DMap k (Event x)))))
905− , mergeSubscribedParents :: !(IORef (DMap k (MergeSubscribedParent x k)))
906− , mergeSubscribedWeakSelf :: !(IORef (Weak (MergeSubscribed x k)))
908− , mergeSubscribedNodeId :: Int
912−--TODO: DMap sucks; we should really write something better (with a functor for the value as well as the key)
914− = Merge { mergeParents :: !(Dynamic x R.PatchDMap (DMap k (Event x)))
915− , mergeSubscribed :: !(IORef (Maybe (MergeSubscribed x k)))
918−data FanSubscribedChildren (x :: *) k a = FanSubscribedChildren
919− { _fanSubscribedChildren_list :: !(WeakBag (Subscriber x a))
920− , _fanSubscribedChildren_self :: {-# NOUNPACK #-} !(k a, FanSubscribed x k)
921− , _fanSubscribedChildren_weakSelf :: !(IORef (Weak (k a, FanSubscribed x k)))
924−data FanSubscribed (x :: *) k
925− = FanSubscribed { fanSubscribedCachedSubscribed :: !(IORef (Maybe (FanSubscribed x k)))
926− , fanSubscribedOccurrence :: !(IORef (Maybe (DMap k Identity)))
927− , fanSubscribedSubscribers :: !(IORef (DMap k (FanSubscribedChildren x k))) -- This DMap should never be empty
928− , fanSubscribedParent :: !(EventSubscription x (DMap k Identity))
930− , fanSubscribedNodeId :: Int
935− = Fan { fanParent :: !(Event x (DMap k Identity))
936− , fanSubscribed :: !(IORef (Maybe (FanSubscribed x k)))
939−data SwitchSubscribed x a
940− = SwitchSubscribed { switchSubscribedCachedSubscribed :: !(IORef (Maybe (SwitchSubscribed x a)))
941− , switchSubscribedOccurrence :: !(IORef (Maybe a))
942− , switchSubscribedHeight :: !(IORef Height)
943− , switchSubscribedSubscribers :: !(WeakBag (Subscriber x a))
944− , switchSubscribedOwnInvalidator :: {-# NOUNPACK #-} !(Invalidator x)
945− , switchSubscribedOwnWeakInvalidator :: !(IORef (Weak (Invalidator x)))
946− , switchSubscribedBehaviorParents :: !(IORef [SomeBehaviorSubscribed x])
947− , switchSubscribedParent :: !(Behavior x (Event x a))
948− , switchSubscribedCurrentParent :: !(IORef (EventSubscription x a))
949− , switchSubscribedWeakSelf :: !(IORef (Weak (SwitchSubscribed x a)))
951− , switchSubscribedNodeId :: Int
956− = Switch { switchParent :: !(Behavior x (Event x a))
957− , switchSubscribed :: !(IORef (Maybe (SwitchSubscribed x a)))
960−{-# ANN CoincidenceSubscribed "HLint: ignore Redundant bracket" #-}
961−data CoincidenceSubscribed x a
962− = CoincidenceSubscribed { coincidenceSubscribedCachedSubscribed :: !(IORef (Maybe (CoincidenceSubscribed x a)))
963− , coincidenceSubscribedOccurrence :: !(IORef (Maybe a))
964− , coincidenceSubscribedSubscribers :: !(WeakBag (Subscriber x a))
965− , coincidenceSubscribedHeight :: !(IORef Height)
966− , coincidenceSubscribedOuter :: {-# NOUNPACK #-} (Subscriber x (Event x a))
967− , coincidenceSubscribedOuterParent :: !(EventSubscription x (Event x a))
968− , coincidenceSubscribedInnerParent :: !(IORef (Maybe (EventSubscribed x a)))
969− , coincidenceSubscribedWeakSelf :: !(IORef (Weak (CoincidenceSubscribed x a)))
971− , coincidenceSubscribedNodeId :: Int
976− = Coincidence { coincidenceParent :: !(Event x (Event x a))
977− , coincidenceSubscribed :: !(IORef (Maybe (CoincidenceSubscribed x a)))
980−{-# NOINLINE newInvalidatorSwitch #-}
981−newInvalidatorSwitch :: SwitchSubscribed x a -> IO (Invalidator x)
982−newInvalidatorSwitch subd = return $! InvalidatorSwitch subd
984−{-# NOINLINE newInvalidatorPull #-}
985−newInvalidatorPull :: Pull x a -> IO (Invalidator x)
986−newInvalidatorPull p = return $! InvalidatorPull p
989− = DynamicHold !(Hold x p a)
990− | p ~ Identity => DynamicHoldIdentity !(Hold x Identity a)
992− | DynamicDyn !(Dyn x p a)
993− | p ~ Identity => DynamicDynIdentity !(Dyn x Identity a)
995−{-# INLINE current #-}
996−current :: R.Patch p => Dynamic x p a -> Behavior x a
998− DynamicHold h -> BehaviorHold h
999− DynamicHoldIdentity h -> BehaviorHoldIdentity h
1000− DynamicConst a -> BehaviorConst a
1001− DynamicDyn d -> BehaviorDyn d
1002− DynamicDynIdentity d -> BehaviorDynIdentity d
1004−--TODO: If you only need updated, not current, can we avoid actually constructing the Hold?
1005−{-# INLINE updated #-}
1006−updated :: R.Patch p => Dynamic x p a -> Event x (p a)
1008− DynamicHold h -> eventHold h
1009− DynamicHoldIdentity h -> eventHoldIdentity h
1010− DynamicConst _ -> eventNever
1011− DynamicDyn d -> eventDyn d
1012− DynamicDynIdentity d -> eventDynIdentity d
1014−newMapDyn :: (a -> b) -> Dynamic x Identity a -> Dynamic x Identity b
1015−newMapDyn f d = DynamicDynIdentity $ unsafeDyn (fmap f $ readBehaviorTracked $ current d) (Identity . f . runIdentity <$> updated d)
1017−instance Functor (Dynamic x Identity) where
1020−instance Applicative (Dynamic x Identity) where
1021− pure = DynamicConst
1022− (<*>) = zipDynWith ($)
1026−instance R.FunctorMaybe (Event x) where
1027− fmapMaybe f = push $ return . f
1029−instance Align (Event x) where
1031− align ea eb = R.fmapMaybe R.dmapToThese $ merge $ DynamicConst $ DMap.fromList [R.LeftTag :=> ea, R.RightTag :=> eb]
1033−--TODO: Avoid the duplication between this and R.zipDynWith
1034−zipDynWith :: (a -> b -> c) -> Dynamic x Identity a -> Dynamic x Identity b -> Dynamic x Identity c
1035−zipDynWith f da db =
1036− let eab = align (updated da) (updated db)
1037− ec = flip push eab $ \o -> do
1038− (a, b) <- case o of
1039− This (Identity a) -> do
1040− b <- readBehaviorUntracked $ current db
1042− That (Identity b) -> do
1043− a <- readBehaviorUntracked $ current da
1045− These (Identity a) (Identity b) -> return (a, b)
1046− return $ Just $ Identity $ f a b
1047− in DynamicDynIdentity $ unsafeDyn (f <$> readBehaviorUntracked (current da) <*> readBehaviorUntracked (current db)) ec
1049−instance Monad (Dynamic x Identity) where
1050− {-# INLINE return #-}
1052− {-# INLINE (>>=) #-}
1053− x >>= f = DynamicDynIdentity $ newJoinDyn $ newMapDyn f x --TODO: (>>), fail
1054− {-# INLINE (>>) #-}
1056− {-# INLINE fail #-}
1057− fail _ = error "Dynamic does not support 'fail'"
1059−newtype Dyn x p a = Dyn { unDyn :: IORef (Either (BehaviorM x a, Event x (p a)) (Hold x p a)) }
1061−unsafeDyn :: BehaviorM x a -> Event x (p a) -> Dyn x p a
1062−unsafeDyn readV0 v' = Dyn $ unsafeNewIORef x $ Left x
1063− where x = (readV0, v')
1065−newJoinDyn :: Dynamic x Identity (Dynamic x Identity a) -> Dyn x Identity a
1067− let readV0 = readBehaviorTracked . current =<< readBehaviorTracked (current d)
1068− eOuter = push (fmap (Just . Identity) . readBehaviorUntracked . current . runIdentity) $ updated d
1069− eInner = switch $ updated <$> current d
1070− eBoth = coincidence $ updated . runIdentity <$> updated d
1071− v' = unSpiderEvent $ R.leftmost $ map SpiderEvent [eBoth, eOuter, eInner]
1072− in unsafeDyn readV0 v'
1074−--type role Behavior representational
1076− = forall p. BehaviorHold !(Hold x p a)
1077− | BehaviorHoldIdentity !(Hold x Identity a)
1079− | BehaviorPull !(Pull x a)
1080− | BehaviorDynIdentity !(Dyn x Identity a)
1081− | forall p. R.Patch p => BehaviorDyn !(Dyn x p a)
1083−-- ResultM can read behaviors and events
1084−type ResultM = EventM
1086−{-# NOINLINE unsafeNewIORef #-}
1087−unsafeNewIORef :: a -> b -> IORef b
1088−unsafeNewIORef _ b = unsafePerformIO $ newIORef b
1090−instance Functor (Event x) where
1091− fmap f = push $ return . Just . f
1093−instance Functor (Behavior x) where
1094− fmap f = pull . fmap f . readBehaviorTracked
1096−{-# NOINLINE push #-} --TODO: If this is helpful, we can get rid of the unsafeNewIORef and use unsafePerformIO directly
1097−push :: (a -> ComputeM x (Maybe b)) -> Event x a -> Event x b
1098−push f e = eventPush $ Push
1101− , pushSubscribed = unsafeNewIORef (f, e) Nothing --TODO: Does the use of the tuple here create unnecessary overhead?
1103−-- DISABLED: {- RULES "push/push" forall f g e. push f (push g e) = push (maybe (return Nothing) f <=< g) e #-}
1105−{-# NOINLINE pull #-}
1106−pull :: BehaviorM x a -> Behavior x a
1107−pull a = BehaviorPull $ Pull
1109− , pullValue = unsafeNewIORef a Nothing
1110−#ifdef DEBUG_NODEIDS
1111− , pullNodeId = unsafeNodeId a
1115−{-# NOINLINE switch #-}
1116−switch :: Behavior x (Event x a) -> Event x a
1117−switch a = eventSwitch $ Switch
1119− , switchSubscribed = unsafeNewIORef a Nothing
1122−coincidence :: Event x (Event x a) -> Event x a
1123−coincidence a = eventCoincidence $ Coincidence
1124− { coincidenceParent = a
1125− , coincidenceSubscribed = unsafeNewIORef a Nothing
1128−-- Propagate the given event occurrence; before cleaning up, run the given action, which may read the state of events and behaviors
1129−run :: [DSum (RootTrigger x) Identity] -> ResultM x b -> SpiderHost x b
1130−run roots after = do
1131− tracePropagate $ "Running an event frame with " <> show (length roots) <> " events"
1132− spiderEnv <- SpiderHost ask
1133− result <- SpiderHost $ lift $ withMVar (_spiderEnv_lock spiderEnv) $ \_ -> flip runReaderT spiderEnv $ unSpiderHost $ runFrame $ do
1134− rootsToPropagate <- forM roots $ \r@(RootTrigger (_, occRef, k) :=> a) -> do
1135− occBefore <- liftIO $ do
1136− occBefore <- readIORef occRef
1137− writeIORef occRef $! DMap.insert k a occBefore
1139− if DMap.null occBefore
1140− then do scheduleRootClear occRef
1142− else return Nothing
1143− forM_ (catMaybes rootsToPropagate) $ \(RootTrigger (subscribersRef, _, _) :=> Identity a) -> do
1144− propagate a subscribersRef
1145− delayedRef <- EventM $ asks eventEnvDelayedMerges
1147− delayed <- liftIO $ readIORef delayedRef
1148− case IntMap.minViewWithKey delayed of
1149− Nothing -> return ()
1150− Just ((currentHeight, cur), future) -> do
1151− tracePropagate $ "Running height " ++ show currentHeight
1152− putCurrentHeight $ Height currentHeight
1153− liftIO $ writeIORef delayedRef $! future
1154− forM_ cur $ \d -> case d of
1155− DelayedMerge subscribed -> do
1156− height <- liftIO $ readIORef $ mergeSubscribedHeight subscribed
1157− case height `compare` Height currentHeight of
1158− LT -> error "Somehow a merge's height has been decreased after it was scheduled"
1159− GT -> scheduleMerge height subscribed -- The height has been increased (by a coincidence event; TODO: is this the only way?)
1161− m <- liftIO $ readIORef $ mergeSubscribedAccum subscribed
1162− liftIO $ writeIORef (mergeSubscribedAccum subscribed) $! DMap.empty
1163− --TODO: Assert that m is not empty
1164− liftIO $ writeIORef (mergeSubscribedOccurrence subscribed) $ Just m
1165− scheduleClear $ mergeSubscribedOccurrence subscribed
1166− propagate m $ mergeSubscribedSubscribers subscribed
1169− putCurrentHeight maxBound
1171− tracePropagate "Done running an event frame"
1174−data SomeClear = forall a. SomeClear (IORef (Maybe a))
1176−data SomeRootClear = forall k. SomeRootClear (IORef (DMap k Identity))
1178−data SomeAssignment x = forall a. SomeAssignment {-# UNPACK #-} !(IORef a) {-# UNPACK #-} !(IORef [Weak (Invalidator x)]) a
1180−data DelayedMerge x = forall k. DelayedMerge (MergeSubscribed x k)
1182−debugFinalize :: Bool
1183−debugFinalize = False
1185−mkWeakPtrWithDebug :: a -> String -> IO (Weak a)
1186−mkWeakPtrWithDebug x debugNote = do
1190− then Just $ putStrLn $ "finalizing: " ++ debugNote
1193−type WeakList a = [Weak a]
1195−{-# INLINE withIncreasedDepth #-}
1197−withIncreasedDepth :: CanTrace x m => m a -> m a
1198−withIncreasedDepth a = do
1199− spiderEnv <- askSpiderEnv
1200− liftIO $ modifyIORef' (_spiderEnv_depth spiderEnv) succ
1202− liftIO $ modifyIORef' (_spiderEnv_depth spiderEnv) pred
1205−withIncreasedDepth :: m a -> m a
1206−withIncreasedDepth = id
1209−type CanTrace x m = (HasSpiderEnv x m, MonadIO m)
1211−{-# INLINE tracePropagate #-}
1212−tracePropagate :: (CanTrace x m) => String -> m ()
1213−tracePropagate = traceWhen debugPropagate
1215−{-# INLINE traceInvalidate #-}
1216−traceInvalidate :: String -> IO ()
1217−traceInvalidate = when debugInvalidate . liftIO . putStrLn
1219−{-# INLINE traceWhen #-}
1220−traceWhen :: (CanTrace x m) => Bool -> String -> m ()
1221−traceWhen b message = traceMWhen b $ return message
1223−{-# INLINE traceMWhen #-}
1224−traceMWhen :: (CanTrace x m) => Bool -> m String -> m ()
1225−traceMWhen b getMessage = when b $ do
1226− message <- getMessage
1228− spiderEnv <- askSpiderEnv
1229− d <- liftIO $ readIORef $ _spiderEnv_depth spiderEnv
1233− liftIO $ putStrLn $ replicate d ' ' <> message
1235−whoCreatedIORef :: IORef a -> IO [String]
1236−whoCreatedIORef (IORef a) = whoCreated $! a
1239−groupByHead :: Eq a => [NonEmpty a] -> [(a, NonEmpty [a])]
1242− (x :| xs) : t -> case groupByHead t of
1243− [] -> [(x, xs :| [])]
1245− | x == y -> (x, xs `NonEmpty.cons` yss) : t'
1246− | otherwise -> (x, xs :| []) : l
1248−listsToForest :: Eq a => [[a]] -> Forest a
1249−listsToForest l = fmap (\(a, l') -> Node a $ listsToForest $ toList l') $ groupByHead $ catMaybes $ fmap nonEmpty l
1252−{-# INLINE propagateSubscriberHold #-}
1253−propagateSubscriberHold :: R.Patch p => Hold x p a -> p a -> EventM x ()
1254−propagateSubscriberHold h a = do
1255− {-# SCC "trace" #-} traceMWhen debugPropagate $ liftIO $ do
1256− invalidators <- liftIO $ readIORef $ holdInvalidators h
1257− return $ "SubscriberHold" <> showNodeId h <> ": " ++ show (length invalidators)
1258− v <- {-# SCC "read" #-} liftIO $ readIORef $ holdValue h
1259− case {-# SCC "apply" #-} R.apply a v of
1260− Nothing -> return ()
1262− {-# SCC "trace2" #-} withIncreasedDepth $ tracePropagate $ "propagateSubscriberHold: assigning Hold" <> showNodeId h
1263− vRef <- {-# SCC "vRef" #-} liftIO $ evaluate $ holdValue h
1264− iRef <- {-# SCC "iRef" #-} liftIO $ evaluate $ holdInvalidators h
1265− defer $ {-# SCC "assignment" #-} SomeAssignment vRef iRef v'
1267−data SomeResetCoincidence x = forall a. SomeResetCoincidence !(EventSubscription x a) !(Maybe (CoincidenceSubscribed x a)) -- The CoincidenceSubscriber will be present only if heights need to be reset
1269−{-# SPECIALIZE readBehaviorUntracked :: Behavior x a -> BehaviorM x a #-}
1270−{-# SPECIALIZE readBehaviorUntracked :: Behavior x a -> EventM x a #-}
1271−readBehaviorUntracked :: Defer (SomeHoldInit x) m => Behavior x a -> m a
1272−readBehaviorUntracked b = do
1273− holdInits <- getDeferralQueue
1274− liftIO $ runBehaviorM (readBehaviorTracked b) Nothing holdInits --TODO: Specialize readBehaviorTracked to the Nothing and Just cases
1276−runBehaviorM :: BehaviorM x a -> Maybe (Weak (Invalidator x), IORef [SomeBehaviorSubscribed x]) -> IORef [SomeHoldInit x] -> IO a
1277−runBehaviorM a mwi holdInits = runReaderT (unBehaviorM a) (mwi, holdInits)
1279−askInvalidator :: BehaviorM x (Maybe (Weak (Invalidator x)))
1281− (!m, _) <- BehaviorM ask
1283− Nothing -> return Nothing
1284− Just (!wi, _) -> return $ Just wi
1286−askParentsRef :: BehaviorM x (Maybe (IORef [SomeBehaviorSubscribed x]))
1288− (!m, _) <- BehaviorM ask
1290− Nothing -> return Nothing
1291− Just (_, !p) -> return $ Just p
1293−askBehaviorHoldInits :: BehaviorM x (IORef [SomeHoldInit x])
1294−askBehaviorHoldInits = do
1295− (_, !his) <- BehaviorM ask
1298−readBehaviorTracked :: Behavior x a -> BehaviorM x a
1299−readBehaviorTracked b = case b of
1300− BehaviorHold h -> readHoldTracked h
1301− BehaviorHoldIdentity h -> readHoldTracked h
1302− BehaviorConst a -> return a
1303− BehaviorPull p -> do
1304− val <- liftIO $ readIORef $ pullValue p
1306− Just subscribed -> do
1307− askParentsRef >>= mapM_ (\r -> liftIO $ modifyIORef' r (SomeBehaviorSubscribed (BehaviorSubscribedPull subscribed) :))
1308− askInvalidator >>= mapM_ (\wi -> liftIO $ modifyIORef' (pullSubscribedInvalidators subscribed) (wi:))
1309− liftIO $ touch $ pullSubscribedOwnInvalidator subscribed
1310− return $ pullSubscribedValue subscribed
1312− i <- liftIO $ newInvalidatorPull p
1313− wi <- liftIO $ mkWeakPtrWithDebug i "InvalidatorPull"
1314− parentsRef <- liftIO $ newIORef []
1315− holdInits <- askBehaviorHoldInits
1316− a <- liftIO $ runReaderT (unBehaviorM $ pullCompute p) (Just (wi, parentsRef), holdInits)
1317− invsRef <- liftIO . newIORef . maybeToList =<< askInvalidator
1318− parents <- liftIO $ readIORef parentsRef
1319− let subscribed = PullSubscribed
1320− { pullSubscribedValue = a
1321− , pullSubscribedInvalidators = invsRef
1322− , pullSubscribedOwnInvalidator = i
1323− , pullSubscribedParents = parents
1325− liftIO $ writeIORef (pullValue p) $ Just subscribed
1326− askParentsRef >>= mapM_ (\r -> liftIO $ modifyIORef' r (SomeBehaviorSubscribed (BehaviorSubscribedPull subscribed) :))
1328− BehaviorDyn d -> readHoldTracked =<< getDynHold d
1329− BehaviorDynIdentity d -> readHoldTracked =<< getDynHold d
1331−{-# INLINE readHoldTracked #-}
1332−readHoldTracked :: Hold x p a -> BehaviorM x a
1333−readHoldTracked h = do
1334− result <- liftIO $ readIORef $ holdValue h
1335− askInvalidator >>= mapM_ (\wi -> liftIO $ modifyIORef' (holdInvalidators h) (wi:))
1336− askParentsRef >>= mapM_ (\r -> liftIO $ modifyIORef' r (SomeBehaviorSubscribed (BehaviorSubscribedHold h) :))
1339−{-# INLINE getDynHold #-}
1340−getDynHold :: (Defer (SomeHoldInit x) m, R.Patch p) => Dyn x p a -> m (Hold x p a)
1342− mh <- liftIO $ readIORef $ unDyn d
1344− Right h -> return h
1345− Left (readV0, v') -> do
1346− holdInits <- getDeferralQueue
1347− v0 <- liftIO $ runBehaviorM readV0 Nothing holdInits
1349− liftIO $ writeIORef (unDyn d) $ Right h
1352−-- Always refers to 0
1353−{-# NOINLINE zeroRef #-}
1354−zeroRef :: IORef Height
1355−zeroRef = unsafePerformIO $ newIORef zeroHeight
1357−type CanSubscribe x m =
1359− , HasCurrentHeight x m
1360− , Defer (SomeHoldInit x) m, Defer (SomeMergeInit x) m -- The things we need to lazily initialize state
1361− , Defer SomeClear m -- Wiping out event firings
1362− , Defer (SomeAssignment x) m -- Updating state
1363− , Defer (SomeResetCoincidence x) m
1367−getRootSubscribed :: GCompare k => k a -> Root x k -> Subscriber x a -> IO (WeakBagTicket (Subscriber x a), RootSubscribed x a, Maybe a)
1368−getRootSubscribed k r sub = do
1369− mSubscribed <- readIORef $ rootSubscribed r
1370− let getOcc = fmap (coerce . DMap.lookup k) $ readIORef $ rootOccurrence r
1371− case DMap.lookup k mSubscribed of
1372− Just subscribed -> {-# SCC "hitRoot" #-} do
1373− sln <- subscribeRootSubscribed subscribed sub
1375− return (sln, subscribed, occ)
1376− Nothing -> {-# SCC "missRoot" #-} do
1377− weakSelf <- newIORef $ error "getRootSubscribed: weakSelfRef not initialized"
1378− let !cached = rootSubscribed r
1379− uninitRef <- newIORef $ error "getRootsubscribed: uninitRef not initialized"
1380− (subs, sln) <- WeakBag.singleton sub weakSelf cleanupRootSubscribed
1381− when debugPropagate $ putStrLn $ "getRootSubscribed: calling rootInit"
1382− uninit <- rootInit r k $ RootTrigger (subs, rootOccurrence r, k)
1383− writeIORef uninitRef $! uninit
1384− let subscribed = RootSubscribed
1385− { rootSubscribedKey = k
1386− , rootSubscribedCachedSubscribed = cached
1387− , rootSubscribedOccurrence = getOcc
1388− , rootSubscribedSubscribers = subs
1389− , rootSubscribedUninit = uninit
1390− , rootSubscribedWeakSelf = weakSelf
1391−#ifdef DEBUG_NODEIDS
1392− , rootSubscribedNodeId = unsafeNodeId (k, r, subs)
1395− writeIORef weakSelf =<< evaluate =<< mkWeakPtrWithDebug subscribed "RootSubscribed"
1396− 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
1398− return (sln, subscribed, occ)
1400−{-# ANN cleanupRootSubscribed "HLint: ignore Redundant bracket" #-}
1401−cleanupRootSubscribed :: RootSubscribed x a -> IO ()
1402−cleanupRootSubscribed self@(RootSubscribed { rootSubscribedKey = k, rootSubscribedCachedSubscribed = cached }) = do
1403− rootSubscribedUninit self
1404− modifyIORef' cached $ DMap.delete k
1406−{-# INLINE subscribeRootSubscribed #-}
1407−subscribeRootSubscribed :: RootSubscribed x a -> Subscriber x a -> IO (WeakBagTicket (Subscriber x a))
1408−subscribeRootSubscribed subscribed sub = WeakBag.insert sub (rootSubscribedSubscribers subscribed) (rootSubscribedWeakSelf subscribed) cleanupRootSubscribed
1410−-- When getPushSubscribed returns, the PushSubscribed returned will have a fully filled-in
1411−{-# SPECIALIZE getPushSubscribed :: Push x a b -> Subscriber x b -> EventM x (WeakBagTicket (Subscriber x b), PushSubscribed x a b, Maybe b) #-}
1412−getPushSubscribed :: CanSubscribe x m => Push x a b -> Subscriber x b -> m (WeakBagTicket (Subscriber x b), PushSubscribed x a b, Maybe b)
1413−getPushSubscribed p sub = do
1414− mSubscribed <- liftIO $ readIORef $ pushSubscribed p
1415− case mSubscribed of
1416− Just subscribed -> {-# SCC "hitPush" #-} liftIO $ do
1417− sln <- subscribePushSubscribed subscribed sub
1418− occ <- readIORef $ pushSubscribedOccurrence subscribed
1419− return (sln, subscribed, occ)
1420− Nothing -> {-# SCC "missPush" #-} do -- Not yet subscribed
1421− subscribedRef <- liftIO $ newIORef $ error "getPushSubscribed: subscribed not yet intialized"
1422− subscribedUnsafe <- liftIO $ unsafeInterleaveIO $ readIORef subscribedRef
1423− s <- liftIO $ newSubscriberPush (pushCompute p) subscribedUnsafe
1424− (subscription@(EventSubscription _ subd), parentOcc) <- subscribeAndRead (pushParent p) s
1425− occ <- runComputeM $ join <$> mapM (pushCompute p) parentOcc
1426− occRef <- liftIO $ newIORef occ
1427− when (isJust occ) $ scheduleClear occRef
1428− weakSelf <- liftIO $ newIORef $ error "getPushSubscribed: weakSelf not initialized"
1429− let !cached = pushSubscribed p
1430− (subs, sln) <- liftIO $ WeakBag.singleton sub weakSelf cleanupPushSubscribed
1431− let subscribed = PushSubscribed
1432− { pushSubscribedCachedSubscribed = cached
1433− , pushSubscribedOccurrence = occRef
1434− , pushSubscribedHeight = eventSubscribedHeightRef subd -- Since pushes have the same height as their parents, share the ref
1435− , pushSubscribedSubscribers = subs
1436− , pushSubscribedSelf = s
1437− , pushSubscribedWeakSelf = weakSelf
1438− , pushSubscribedParent = subscription
1439−#ifdef DEBUG_NODEIDS
1440− , pushSubscribedNodeId = unsafeNodeId p
1443− liftIO $ writeIORef weakSelf =<< evaluate =<< mkWeakPtrWithDebug subscribed "PushSubscribed"
1444− liftIO $ writeIORef subscribedRef $! subscribed
1445− liftIO $ writeIORef (pushSubscribed p) $ Just subscribed
1446− return (sln, subscribed, occ)
1448−cleanupPushSubscribed :: PushSubscribed x a b -> IO ()
1449−cleanupPushSubscribed self = do
1450− unsubscribe $ pushSubscribedParent self
1451− writeIORef (pushSubscribedCachedSubscribed self) $ Nothing
1453−{-# INLINE subscribePushSubscribed #-}
1454−subscribePushSubscribed :: PushSubscribed x a b -> Subscriber x b -> IO (WeakBagTicket (Subscriber x b))
1455−subscribePushSubscribed subscribed sub = WeakBag.insert sub (pushSubscribedSubscribers subscribed) (pushSubscribedWeakSelf subscribed) cleanupPushSubscribed
1457−{-# SPECIALIZE getMergeSubscribed :: GCompare k => Merge x k -> Subscriber x (DMap k Identity) -> EventM x (WeakBagTicket (Subscriber x (DMap k Identity)), MergeSubscribed x k, Maybe (DMap k Identity)) #-}
1458−getMergeSubscribed :: forall x k m. (CanSubscribe x m, GCompare k) => Merge x k -> Subscriber x (DMap k Identity) -> m (WeakBagTicket (Subscriber x (DMap k Identity)), MergeSubscribed x k, Maybe (DMap k Identity))
1459−getMergeSubscribed m sub = do
1460− mSubscribed <- liftIO $ readIORef $ mergeSubscribed m
1461− case mSubscribed of
1462− Just subscribed -> {-# SCC "hitMerge" #-} liftIO $ do
1463− sln <- subscribeMergeSubscribed subscribed sub
1464− occ <- readIORef $ mergeSubscribedOccurrence subscribed
1465− return (sln, subscribed, occ)
1466− Nothing -> {-# SCC "missMerge" #-} do
1467− subscribedRef <- liftIO $ newIORef $ error "getMergeSubscribed: subscribedRef not yet initialized"
1468− subscribedUnsafe <- liftIO $ unsafeInterleaveIO $ readIORef subscribedRef
1469− initialParents <- readBehaviorUntracked $ current $ mergeParents m
1470− subscribers :: [(Maybe (DSum k Identity), Height, DSum k (MergeSubscribedParent x k))] <- forM (DMap.toList initialParents) $ \(k :=> e) -> do
1471− s <- liftIO $ newSubscriberMerge k subscribedUnsafe
1472− (subscription@(EventSubscription _ parentSubd), parentOcc) <- subscribeAndRead e s
1473− height <- liftIO $ getEventSubscribedHeight parentSubd
1474− return $ (fmap (\x -> k :=> Identity x) parentOcc, height, k :=> MergeSubscribedParent subscription s)
1475− let dm = DMap.fromDistinctAscList $ mapMaybe (\(x, _, _) -> x) subscribers
1476− heights = fmap (\(_, h, _) -> h) subscribers --TODO: Assert that there's no invalidHeight in here
1477− myHeightBag = heightBagFromList $ filter (/= invalidHeight) heights
1478− myHeight = if invalidHeight `elem` heights
1480− else succHeight $ heightBagMax myHeightBag
1481− currentHeight <- getCurrentHeight
1482− let (occ, accum) = if currentHeight >= myHeight -- If we should have fired by now
1483− then (if DMap.null dm then Nothing else Just dm, DMap.empty)
1485− unless (DMap.null accum) $ do
1486− scheduleMerge myHeight subscribedUnsafe
1487− occRef <- liftIO $ newIORef occ
1488− when (isJust occ) $ scheduleClear occRef
1489− accumRef <- liftIO $ newIORef accum
1490− heightRef <- liftIO $ newIORef myHeight
1491− heightMapRef <- liftIO $ newIORef myHeightBag
1492− weakSelf <- liftIO $ newIORef $ error "getMergeSubscribed: weakSelf not yet initialized"
1493− (subs, sln) <- liftIO $ WeakBag.singleton sub weakSelf cleanupMergeSubscribed
1494− changeSubdRef <- liftIO $ newIORef $ error "getMergeSubscribed: changeSubdRef not yet initialized"
1495− parentsRef <- liftIO $ newIORef $ DMap.fromDistinctAscList $ map (\(_, _, x) -> x) subscribers
1496− let !subscribed = MergeSubscribed
1497− { mergeSubscribedCachedSubscribed = mergeSubscribed m
1498− , mergeSubscribedOccurrence = occRef
1499− , mergeSubscribedAccum = accumRef
1500− , mergeSubscribedHeight = heightRef
1501− , mergeSubscribedHeightBag = heightMapRef
1502− , mergeSubscribedSubscribers = subs
1503− , mergeSubscribedChange = changeSubdRef
1504− , mergeSubscribedParents = parentsRef
1505− , mergeSubscribedWeakSelf = weakSelf
1506−#ifdef DEBUG_NODEIDS
1507− , mergeSubscribedNodeId = unsafeNodeId m
1510− defer $ SomeMergeInit subscribed $ updated $ mergeParents m
1511− liftIO $ writeIORef subscribedRef $! subscribed
1512− liftIO $ writeIORef weakSelf =<< evaluate =<< mkWeakPtrWithDebug subscribed "MergeSubscribed"
1513− liftIO $ writeIORef (mergeSubscribed m) $ Just subscribed
1514− return (sln, subscribed, occ)
1516−cleanupMergeSubscribed :: MergeSubscribed x k -> IO ()
1517−cleanupMergeSubscribed subscribed = do
1518− parents <- readIORef $ mergeSubscribedParents subscribed
1519− forM_ (DMap.toList parents) $ \(_ :=> msp) -> unsubscribe $ mergeSubscribedParentSubscription msp
1520− -- Not necessary, because this whole MergeSubscribed is dead: writeIORef (mergeSubscribedParents subscribed) DMap.empty
1521− writeIORef (mergeSubscribedCachedSubscribed subscribed) $ Nothing -- Get rid of the cached subscribed
1523−{-# INLINE subscribeMergeSubscribed #-}
1524−subscribeMergeSubscribed :: MergeSubscribed x k -> Subscriber x (DMap k Identity) -> IO (WeakBagTicket (Subscriber x (DMap k Identity)))
1525−subscribeMergeSubscribed subscribed sub = WeakBag.insert sub (mergeSubscribedSubscribers subscribed) (mergeSubscribedWeakSelf subscribed) cleanupMergeSubscribed
1527−{-# SPECIALIZE getFanSubscribed :: GCompare k => k a -> Fan x k -> Subscriber x a -> EventM x (WeakBagTicket (Subscriber x a), FanSubscribed x k, Maybe a) #-}
1528−getFanSubscribed :: (Defer (SomeAssignment x) m, Defer (SomeHoldInit x) m, Defer (SomeMergeInit x) m, Defer SomeClear m, HasCurrentHeight x m, Defer (SomeResetCoincidence x) m, HasSpiderEnv x m, m ~ EventM x, GCompare k) => k a -> Fan x k -> Subscriber x a -> m (WeakBagTicket (Subscriber x a), FanSubscribed x k, Maybe a)
1529−getFanSubscribed k f sub = do
1530− mSubscribed <- liftIO $ readIORef $ fanSubscribed f
1531− case mSubscribed of
1532− Just subscribed -> {-# SCC "hitFan" #-} liftIO $ do
1533− sln <- subscribeFanSubscribed k subscribed sub
1534− occ <- readIORef $ fanSubscribedOccurrence subscribed
1535− return (sln, subscribed, coerce $ DMap.lookup k =<< occ)
1536− Nothing -> {-# SCC "missFan" #-} do
1537− subscribedRef <- liftIO $ newIORef $ error "getFanSubscribed: subscribedRef not yet initialized"
1538− subscribedUnsafe <- liftIO $ unsafeInterleaveIO $ readIORef subscribedRef
1539− s <- liftIO $ newSubscriberFan subscribedUnsafe
1540− (subscription, parentOcc) <- subscribeAndRead (fanParent f) s
1541− weakSelf <- liftIO $ newIORef $ error "getFanSubscribed: weakSelf not yet initialized"
1542− (subsForK, slnForSub) <- liftIO $ WeakBag.singleton sub weakSelf cleanupFanSubscribed
1543− subscribersRef <- liftIO $ newIORef $ error "getFanSubscribed: subscribersRef not yet initialized"
1544− occRef <- liftIO $ newIORef parentOcc
1545− when (isJust parentOcc) $ scheduleClear occRef
1546− let subscribed = FanSubscribed
1547− { fanSubscribedCachedSubscribed = fanSubscribed f
1548− , fanSubscribedOccurrence = occRef
1549− , fanSubscribedParent = subscription
1550− , fanSubscribedSubscribers = subscribersRef
1551−#ifdef DEBUG_NODEIDS
1552− , fanSubscribedNodeId = unsafeNodeId f
1555− let !self = (k, subscribed)
1556− liftIO $ writeIORef subscribersRef $! DMap.singleton k $ FanSubscribedChildren subsForK self weakSelf
1557− liftIO $ writeIORef weakSelf =<< evaluate =<< mkWeakPtrWithDebug self "FanSubscribed"
1558− liftIO $ writeIORef subscribedRef $! subscribed
1559− liftIO $ writeIORef (fanSubscribed f) $ Just subscribed
1560− return (slnForSub, subscribed, coerce $ DMap.lookup k =<< parentOcc)
1562−cleanupFanSubscribed :: GCompare k => (k a, FanSubscribed x k) -> IO ()
1563−cleanupFanSubscribed (k, subscribed) = do
1564− subscribers <- readIORef $ fanSubscribedSubscribers subscribed
1565− let reducedSubscribers = DMap.delete k subscribers
1566− if DMap.null reducedSubscribers
1568− unsubscribe $ fanSubscribedParent subscribed
1569− -- Not necessary in this case, because this whole FanSubscribed is dead: writeIORef (fanSubscribedSubscribers subscribed) reducedSubscribers
1570− writeIORef (fanSubscribedCachedSubscribed subscribed) Nothing
1571− else writeIORef (fanSubscribedSubscribers subscribed) $! reducedSubscribers
1573−{-# INLINE subscribeFanSubscribed #-}
1574−subscribeFanSubscribed :: GCompare k => k a -> FanSubscribed x k -> Subscriber x a -> IO (WeakBagTicket (Subscriber x a))
1575−subscribeFanSubscribed k subscribed sub = do
1576− subscribers <- readIORef $ fanSubscribedSubscribers subscribed
1577− case DMap.lookup k subscribers of
1578− Nothing -> {-# SCC "missSubscribeFanSubscribed" #-} do
1579− let !self = (k, subscribed)
1580− weakSelf <- newIORef =<< mkWeakPtrWithDebug self "FanSubscribed"
1581− (list, sln) <- WeakBag.singleton sub weakSelf cleanupFanSubscribed
1582− 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
1584− Just (FanSubscribedChildren list _ weakSelf) -> {-# SCC "hitSubscribeFanSubscribed" #-} WeakBag.insert sub list weakSelf cleanupFanSubscribed
1586−{-# SPECIALIZE getSwitchSubscribed :: Switch x a -> Subscriber x a -> EventM x (WeakBagTicket (Subscriber x a), SwitchSubscribed x a, Maybe a) #-}
1587−getSwitchSubscribed :: (Defer (SomeHoldInit x) m, Defer (SomeAssignment x) m, Defer (SomeMergeInit x) m, Defer SomeClear m, Defer (SomeResetCoincidence x) m, HasCurrentHeight x m, HasSpiderEnv x m, m ~ EventM x) => Switch x a -> Subscriber x a -> m (WeakBagTicket (Subscriber x a), SwitchSubscribed x a, Maybe a)
1588−getSwitchSubscribed s sub = do
1589− mSubscribed <- liftIO $ readIORef $ switchSubscribed s
1590− case mSubscribed of
1591− Just subscribed -> {-# SCC "hitSwitch" #-} liftIO $ do
1592− sln <- subscribeSwitchSubscribed subscribed sub
1593− occ <- readIORef $ switchSubscribedOccurrence subscribed
1594− return (sln, subscribed, occ)
1595− Nothing -> {-# SCC "missSwitch" #-} do
1596− subscribedRef <- liftIO $ newIORef $ error "getSwitchSubscribed: subscribed has not yet been created"
1597− subscribedUnsafe <- liftIO $ unsafeInterleaveIO $ readIORef subscribedRef
1598− i <- liftIO $ newInvalidatorSwitch subscribedUnsafe
1599− mySub <- liftIO $ newSubscriberSwitch subscribedUnsafe
1600− wi <- liftIO $ mkWeakPtrWithDebug i "InvalidatorSwitch"
1601− wiRef <- liftIO $ newIORef wi
1602− parentsRef <- liftIO $ newIORef [] --TODO: This should be unnecessary, because it will always be filled with just the single parent behavior
1603− holdInits <- getDeferralQueue
1604− e <- liftIO $ runBehaviorM (readBehaviorTracked (switchParent s)) (Just (wi, parentsRef)) holdInits
1605− (subscription@(EventSubscription _ subd), parentOcc) <- subscribeAndRead e mySub
1606− heightRef <- liftIO $ newIORef =<< getEventSubscribedHeight subd
1607− subscriptionRef <- liftIO $ newIORef subscription
1608− occRef <- liftIO $ newIORef parentOcc
1609− when (isJust parentOcc) $ scheduleClear occRef
1610− weakSelf <- liftIO $ newIORef $ error "getSwitchSubscribed: weakSelf not yet initialized"
1611− (subs, slnForSub) <- liftIO $ WeakBag.singleton sub weakSelf cleanupSwitchSubscribed
1612− let !subscribed = SwitchSubscribed
1613− { switchSubscribedCachedSubscribed = switchSubscribed s
1614− , switchSubscribedOccurrence = occRef
1615− , switchSubscribedHeight = heightRef
1616− , switchSubscribedSubscribers = subs
1617− , switchSubscribedOwnInvalidator = i
1618− , switchSubscribedOwnWeakInvalidator = wiRef
1619− , switchSubscribedBehaviorParents = parentsRef
1620− , switchSubscribedParent = switchParent s
1621− , switchSubscribedCurrentParent = subscriptionRef
1622− , switchSubscribedWeakSelf = weakSelf
1623−#ifdef DEBUG_NODEIDS
1624− , switchSubscribedNodeId = unsafeNodeId s
1627− liftIO $ writeIORef weakSelf =<< evaluate =<< mkWeakPtrWithDebug subscribed "switchSubscribedWeakSelf"
1628− liftIO $ writeIORef subscribedRef $! subscribed
1629− liftIO $ writeIORef (switchSubscribed s) $ Just subscribed
1630− return (slnForSub, subscribed, parentOcc)
1632−cleanupSwitchSubscribed :: SwitchSubscribed x a -> IO ()
1633−cleanupSwitchSubscribed subscribed = do
1634− unsubscribe =<< readIORef (switchSubscribedCurrentParent subscribed)
1635− finalize =<< readIORef (switchSubscribedOwnWeakInvalidator subscribed) -- We don't need to get invalidated if we're dead
1636− writeIORef (switchSubscribedCachedSubscribed subscribed) Nothing
1638−{-# INLINE subscribeSwitchSubscribed #-}
1639−subscribeSwitchSubscribed :: SwitchSubscribed x a -> Subscriber x a -> IO (WeakBagTicket (Subscriber x a))
1640−subscribeSwitchSubscribed subscribed sub = WeakBag.insert sub (switchSubscribedSubscribers subscribed) (switchSubscribedWeakSelf subscribed) cleanupSwitchSubscribed
1642−{-# SPECIALIZE getCoincidenceSubscribed :: Coincidence x a -> Subscriber x a -> EventM x (WeakBagTicket (Subscriber x a), CoincidenceSubscribed x a, Maybe a) #-}
1643−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, HasSpiderEnv x m, m ~ EventM x) => Coincidence x a -> Subscriber x a -> m (WeakBagTicket (Subscriber x a), CoincidenceSubscribed x a, Maybe a)
1644−getCoincidenceSubscribed c sub = do
1645− mSubscribed <- liftIO $ readIORef $ coincidenceSubscribed c
1646− case mSubscribed of
1647− Just subscribed -> {-# SCC "hitCoincidence" #-} liftIO $ do
1648− sln <- subscribeCoincidenceSubscribed subscribed sub
1649− occ <- readIORef $ coincidenceSubscribedOccurrence subscribed
1650− return (sln, subscribed, occ)
1651− Nothing -> {-# SCC "missCoincidence" #-} do
1652− subscribedRef <- liftIO $ newIORef $ error "getCoincidenceSubscribed: subscribed has not yet been created"
1653− subscribedUnsafe <- liftIO $ unsafeInterleaveIO $ readIORef subscribedRef
1654− subOuter <- liftIO $ newSubscriberCoincidenceOuter subscribedUnsafe
1655− (outerSubscription@(EventSubscription _ outerSubd), outerOcc) <- subscribeAndRead (coincidenceParent c) subOuter
1656− outerHeight <- liftIO $ getEventSubscribedHeight outerSubd
1657− (occ, height, mInnerSubd) <- case outerOcc of
1658− Nothing -> return (Nothing, outerHeight, Nothing)
1660− (occ, height, innerSubd) <- subscribeCoincidenceInner o outerHeight subscribedUnsafe
1661− return (occ, height, Just innerSubd)
1662− occRef <- liftIO $ newIORef occ
1663− when (isJust occ) $ scheduleClear occRef
1664− heightRef <- liftIO $ newIORef height
1665− innerSubdRef <- liftIO $ newIORef mInnerSubd
1666− scheduleClear innerSubdRef
1667− weakSelf <- liftIO $ newIORef $ error "getCoincidenceSubscribed: weakSelf not yet implemented"
1668− (subs, slnForSub) <- liftIO $ WeakBag.singleton sub weakSelf cleanupCoincidenceSubscribed
1669− let subscribed = CoincidenceSubscribed
1670− { coincidenceSubscribedCachedSubscribed = coincidenceSubscribed c
1671− , coincidenceSubscribedOccurrence = occRef
1672− , coincidenceSubscribedHeight = heightRef
1673− , coincidenceSubscribedSubscribers = subs
1674− , coincidenceSubscribedOuter = subOuter
1675− , coincidenceSubscribedOuterParent = outerSubscription
1676− , coincidenceSubscribedInnerParent = innerSubdRef
1677− , coincidenceSubscribedWeakSelf = weakSelf
1678−#ifdef DEBUG_NODEIDS
1679− , coincidenceSubscribedNodeId = unsafeNodeId c
1682− liftIO $ writeIORef weakSelf =<< evaluate =<< mkWeakPtrWithDebug subscribed "CoincidenceSubscribed"
1683− liftIO $ writeIORef subscribedRef $! subscribed
1684− liftIO $ writeIORef (coincidenceSubscribed c) $ Just subscribed
1685− return (slnForSub, subscribed, occ)
1687−cleanupCoincidenceSubscribed :: CoincidenceSubscribed x a -> IO ()
1688−cleanupCoincidenceSubscribed subscribed = do
1689− unsubscribe $ coincidenceSubscribedOuterParent subscribed
1690− writeIORef (coincidenceSubscribedCachedSubscribed subscribed) Nothing
1692−{-# INLINE subscribeCoincidenceSubscribed #-}
1693−subscribeCoincidenceSubscribed :: CoincidenceSubscribed x a -> Subscriber x a -> IO (WeakBagTicket (Subscriber x a))
1694−subscribeCoincidenceSubscribed subscribed sub = WeakBag.insert sub (coincidenceSubscribedSubscribers subscribed) (coincidenceSubscribedWeakSelf subscribed) cleanupCoincidenceSubscribed
1696−{-# INLINE merge #-}
1697−merge :: GCompare k => Dynamic x R.PatchDMap (DMap k (Event x)) -> Event x (DMap k Identity)
1698−merge m = eventMerge $ Merge
1700− , mergeSubscribed = unsafeNewIORef m Nothing
1703−newtype EventSelector x k = EventSelector { select :: forall a. k a -> Event x a }
1705−fan :: GCompare k => Event x (DMap k Identity) -> EventSelector x k
1709− , fanSubscribed = unsafeNewIORef e Nothing
1711− in EventSelector $ \k -> eventFan k f
1713−runHoldInits :: IORef [SomeHoldInit x] -> IORef [SomeMergeInit x] -> EventM x ()
1714−runHoldInits holdInitRef mergeInitRef = do
1715− holdInits <- liftIO $ readIORef holdInitRef
1716− mergeInits <- liftIO $ readIORef mergeInitRef
1717− unless (null holdInits && null mergeInits) $ do
1718− liftIO $ writeIORef holdInitRef []
1719− liftIO $ writeIORef mergeInitRef []
1720− mapM_ initHold holdInits
1721− mapM_ initMerge mergeInits
1722− runHoldInits holdInitRef mergeInitRef
1724−initHold :: SomeHoldInit x -> EventM x ()
1725−initHold (SomeHoldInit h) = void $ getHoldEventSubscription h
1727−initMerge :: SomeMergeInit x -> EventM x ()
1728−initMerge (SomeMergeInit subscribed changed) = do
1729− changeSub <- liftIO $ newSubscriberMergeChange subscribed
1730− (EventSubscription _ changeSubd, change) <- subscribeAndRead changed changeSub
1731− forM_ change $ \c -> defer $ SomeMergeUpdate c subscribed
1732− liftIO $ writeIORef (mergeSubscribedChange subscribed) (changeSub, changeSubd)
1734−-- | Run an event action outside of a frame
1735−runFrame :: forall x a. EventM x a -> SpiderHost x a --TODO: This function also needs to hold the mutex
1736−runFrame a = SpiderHost $ ask >>= \spiderEnv -> lift $ do
1737− -- Clear out pending unsubscriptions; these will need to happen eventually anyway, and might cause us a lot of extra work during the frame, so get rid of them now
1738− pendingCleanups <- atomicModifyIORef (_spiderEnv_cleanups spiderEnv) $ \x -> ([], x)
1739− {-# SCC "cleanups" #-} sequence_ pendingCleanups
1740− toAssignRef <- newIORef [] -- This should only actually get used when events are firing
1741− holdInitRef <- newIORef []
1742− mergeUpdateRef <- newIORef []
1743− mergeInitRef <- newIORef []
1744− heightRef <- newIORef zeroHeight
1745− toClearRef <- newIORef []
1746− toClearRootRef <- newIORef []
1747− coincidenceInfosRef <- newIORef []
1748− delayedRef <- liftIO $ newIORef IntMap.empty
1749− let env = EventEnv spiderEnv toAssignRef holdInitRef mergeUpdateRef mergeInitRef toClearRef toClearRootRef heightRef coincidenceInfosRef delayedRef
1752− runHoldInits holdInitRef mergeInitRef -- This must happen before doing the assignments, in case subscribing a Hold causes existing Holds to be read by the newly-propagated events
1754− result <- runEventM go env
1755− toClear <- readIORef toClearRef
1756− forM_ toClear $ \(SomeClear ref) -> {-# SCC "clear" #-} writeIORef ref Nothing
1757− toClearRoot <- readIORef toClearRootRef
1758− forM_ toClearRoot $ \(SomeRootClear ref) -> {-# SCC "rootClear" #-} writeIORef ref $! DMap.empty
1759− toAssign <- readIORef toAssignRef
1760− toReconnectRef <- newIORef []
1761− coincidenceInfos <- readIORef coincidenceInfosRef
1762− forM_ toAssign $ \(SomeAssignment vRef iRef v) -> {-# SCC "assignment" #-} do
1764− when debugInvalidate $ putStrLn $ "Invalidating Hold"
1765− writeIORef iRef =<< evaluate =<< invalidate toReconnectRef =<< readIORef iRef
1766− mergeUpdates <- readIORef mergeUpdateRef
1767− writeIORef mergeUpdateRef []
1768− let updateMerge :: SomeMergeUpdate x -> IO [SomeEventSubscription x]
1769− updateMerge (SomeMergeUpdate (R.PatchDMap p :: R.PatchDMap (DMap k (Event x))) m) = do
1770− oldParents <- readIORef $ mergeSubscribedParents m
1771− let f (subscriptionsToKill, ps) (k :=> Compose me) = do
1772− (mOldSubd, newPs) <- case me of
1773− Nothing -> return $ DMap.updateLookupWithKey (\_ _ -> Nothing) k ps
1775− s <- liftIO $ newSubscriberMerge k m
1776− subscription@(EventSubscription _ subd) <- subscribe e s
1777− newParentHeight <- liftIO $ getEventSubscribedHeight subd
1778− let newParent = MergeSubscribedParent subscription s
1779− liftIO $ addMergeHeight newParentHeight m
1780− return $ DMap.insertLookupWithKey' (\_ new _ -> new) k newParent ps
1781− forM_ mOldSubd $ \oldSubd -> do
1782− oldHeight <- liftIO $ getEventSubscribedHeight $ _eventSubscription_subscribed $ mergeSubscribedParentSubscription oldSubd
1783− liftIO $ removeMergeHeight oldHeight m
1784− return (maybeToList (SomeEventSubscription . mergeSubscribedParentSubscription <$> mOldSubd) ++ subscriptionsToKill, newPs)
1785− (subscriptionsToKill, newParents) <- flip runEventM env $ 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
1786− writeIORef (mergeSubscribedParents m) $! newParents
1787− return subscriptionsToKill
1788− when debugPropagate $ putStrLn "Updating merges"
1789− mergeSubscriptionsToKill <- concat <$> mapM updateMerge mergeUpdates
1790− when debugPropagate $ putStrLn "Updating merges done"
1791− toReconnect <- readIORef toReconnectRef
1792− switchSubscriptionsToKill <- forM toReconnect $ \(SomeSwitchSubscribed subscribed) -> {-# SCC "switchSubscribed" #-} do
1793− oldSubscription <- readIORef $ switchSubscribedCurrentParent subscribed
1794− wi <- readIORef $ switchSubscribedOwnWeakInvalidator subscribed
1795− when debugInvalidate $ putStrLn $ "Finalizing invalidator for Switch" <> showNodeId subscribed
1797− i <- evaluate $ switchSubscribedOwnInvalidator subscribed
1798− wi' <- mkWeakPtrWithDebug i "wi'"
1799− writeIORef (switchSubscribedOwnWeakInvalidator subscribed) $! wi'
1800− writeIORef (switchSubscribedBehaviorParents subscribed) []
1801− writeIORef holdInitRef [] --TODO: Should we reuse this?
1802− e <- runBehaviorM (readBehaviorTracked (switchSubscribedParent subscribed)) (Just (wi', switchSubscribedBehaviorParents subscribed)) holdInitRef
1803− runEventM (runHoldInits holdInitRef mergeInitRef) 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
1804− --TODO: Make sure we touch the pieces of the SwitchSubscribed at the appropriate times
1805− sub <- newSubscriberSwitch subscribed
1806− subscription <- runReaderT (unSpiderHost (runFrame ({-# SCC "subscribeSwitch" #-} subscribe e sub))) spiderEnv --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
1808− stackTrace <- liftIO $ fmap renderStack $ ccsToStrings =<< (getCCSOf $! switchSubscribedParent subscribed)
1809− liftIO $ putStrLn $ (++stackTrace) $ "subd' subscribed to " ++ case e of
1810− EventRoot _ -> "EventRoot"
1811− EventNever -> "EventNever"
1812− _ -> "something else"
1814− writeIORef (switchSubscribedCurrentParent subscribed) $! subscription
1815− return $ SomeEventSubscription oldSubscription
1816− forM_ mergeSubscriptionsToKill $ \(SomeEventSubscription oldSubscription) -> liftIO $ unsubscribe oldSubscription
1817− forM_ switchSubscriptionsToKill $ \(SomeEventSubscription oldSubscription) -> liftIO $ unsubscribe oldSubscription
1818− forM_ toReconnect $ \(SomeSwitchSubscribed subscribed) -> {-# SCC "switchSubscribed" #-} do
1819− EventSubscription _ subd' <- readIORef $ switchSubscribedCurrentParent subscribed
1820− parentHeight <- getEventSubscribedHeight subd'
1821− myHeight <- readIORef $ switchSubscribedHeight subscribed
1822− when (parentHeight /= myHeight) $ do
1823− writeIORef (switchSubscribedHeight subscribed) $! invalidHeight
1824− WeakBag.traverse (switchSubscribedSubscribers subscribed) $ invalidateSubscriberHeight myHeight
1825− forM_ mergeUpdates $ \(SomeMergeUpdate _ m) -> do
1826− invalidateMergeHeight m --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
1827− forM_ coincidenceInfos $ \(SomeResetCoincidence subscription mcs) -> do
1828− unsubscribe subscription
1829− mapM_ invalidateCoincidenceHeight mcs
1830− forM_ coincidenceInfos $ \(SomeResetCoincidence _ mcs) -> mapM_ recalculateCoincidenceHeight mcs
1831− forM_ mergeUpdates $ \(SomeMergeUpdate _ m) -> revalidateMergeHeight m
1832− forM_ toReconnect $ \(SomeSwitchSubscribed subscribed) -> do
1833− height <- calculateSwitchHeight subscribed
1834− updateSwitchHeight height subscribed
1837−newtype Height = Height { unHeight :: Int } deriving (Show, Read, Eq, Ord, Bounded)
1839−{-# INLINE zeroHeight #-}
1840−zeroHeight :: Height
1841−zeroHeight = Height 0
1843−{-# INLINE invalidHeight #-}
1844−invalidHeight :: Height
1845−invalidHeight = Height (-1000)
1848−-- | An invalid height that is currently being traversed, e.g. by walkInvalidHeightParents
1849−{-# INLINE invalidHeightBeingTraversed #-}
1850−invalidHeightBeingTraversed :: Height
1851−invalidHeightBeingTraversed = Height (-1001)
1854−{-# INLINE succHeight #-}
1855−succHeight :: Height -> Height
1856−succHeight h@(Height a) =
1857− if h == invalidHeight
1859− else Height $ succ a
1861−removeMergeHeight :: Height -> MergeSubscribed x k -> IO ()
1862−removeMergeHeight oldParentHeight subscribed = do
1863− when debugInvalidateHeight $ putStrLn $ "removeMergeHeight: " <> show oldParentHeight <> " Merge" <> showNodeId subscribed
1864− oldHeights <- readIORef $ mergeSubscribedHeightBag subscribed
1865− let newHeights = heightBagRemove oldParentHeight oldHeights
1866− writeIORef (mergeSubscribedHeightBag subscribed) $! newHeights
1868−invalidateMergeHeight :: MergeSubscribed x k -> IO ()
1869−invalidateMergeHeight subscribed = do
1870− oldHeight <- readIORef $ mergeSubscribedHeight subscribed
1871− -- If the height used to be valid, it must be invalid now; we should never have *more* heights than we have parents
1872− when (oldHeight /= invalidHeight) $ do
1873− writeIORef (mergeSubscribedHeight subscribed) $! invalidHeight
1874− WeakBag.traverse (mergeSubscribedSubscribers subscribed) $ invalidateSubscriberHeight oldHeight
1876−addMergeHeight :: Height -> MergeSubscribed x k -> IO ()
1877−addMergeHeight newParentHeight subscribed = do
1878− when debugInvalidateHeight $ putStrLn $ "addMergeHeight: " <> show newParentHeight <> " Merge" <> showNodeId subscribed
1879− oldHeights <- readIORef $ mergeSubscribedHeightBag subscribed
1880− let newHeights = heightBagAdd newParentHeight oldHeights
1881− writeIORef (mergeSubscribedHeightBag subscribed) $! newHeights
1883−revalidateMergeHeight :: MergeSubscribed x k -> IO ()
1884−revalidateMergeHeight subscribed = do
1885− currentHeight <- readIORef $ mergeSubscribedHeight subscribed
1886− when (currentHeight == invalidHeight) $ do -- revalidateMergeHeight may be called multiple times; perhaps the's a way to finesse it to avoid this check
1887− heights <- readIORef $ mergeSubscribedHeightBag subscribed
1888− parents <- readIORef $ mergeSubscribedParents subscribed
1889− -- When the number of heights in the bag reaches the number of parents, we should have a valid height
1890− case heightBagSize heights `compare` DMap.size parents of
1893− let height = succHeight $ heightBagMax heights
1894− when debugInvalidateHeight $ putStrLn $ "recalculateSubscriberHeight: height: " <> show height
1895− writeIORef (mergeSubscribedHeight subscribed) $! height
1896− WeakBag.traverse (mergeSubscribedSubscribers subscribed) $ recalculateSubscriberHeight height
1897− GT -> error $ "revalidateMergeHeight: more heights than parents for Merge" <> showNodeId subscribed
1899−invalidateCoincidenceHeight :: CoincidenceSubscribed x a -> IO ()
1900−invalidateCoincidenceHeight subscribed = do
1901− oldHeight <- readIORef $ coincidenceSubscribedHeight subscribed
1902− when (oldHeight /= invalidHeight) $ do
1903− writeIORef (coincidenceSubscribedHeight subscribed) $! invalidHeight
1904− WeakBag.traverse (coincidenceSubscribedSubscribers subscribed) $ invalidateSubscriberHeight oldHeight
1906−updateSwitchHeight :: Height -> SwitchSubscribed x a -> IO ()
1907−updateSwitchHeight new subscribed = do
1908− oldHeight <- readIORef $ switchSubscribedHeight subscribed
1909− when (oldHeight == invalidHeight) $ do --TODO: This 'when' should probably be an assertion
1910− when (new /= invalidHeight) $ do --TODO: This 'when' should probably be an assertion
1911− writeIORef (switchSubscribedHeight subscribed) $! new
1912− WeakBag.traverse (switchSubscribedSubscribers subscribed) $ recalculateSubscriberHeight new
1914−recalculateCoincidenceHeight :: CoincidenceSubscribed x a -> IO ()
1915−recalculateCoincidenceHeight subscribed = do
1916− oldHeight <- readIORef $ coincidenceSubscribedHeight subscribed
1917− when (oldHeight == invalidHeight) $ do --TODO: This 'when' should probably be an assertion
1918− height <- calculateCoincidenceHeight subscribed
1919− when (height /= invalidHeight) $ do
1920− writeIORef (coincidenceSubscribedHeight subscribed) $! height
1921− WeakBag.traverse (coincidenceSubscribedSubscribers subscribed) $ recalculateSubscriberHeight height
1923−calculateSwitchHeight :: SwitchSubscribed x a -> IO Height
1924−calculateSwitchHeight subscribed = getEventSubscribedHeight . _eventSubscription_subscribed =<< readIORef (switchSubscribedCurrentParent subscribed)
1926−calculateCoincidenceHeight :: CoincidenceSubscribed x a -> IO Height
1927−calculateCoincidenceHeight subscribed = do
1928− outerHeight <- getEventSubscribedHeight $ _eventSubscription_subscribed $ coincidenceSubscribedOuterParent subscribed
1929− innerHeight <- maybe (return zeroHeight) getEventSubscribedHeight =<< readIORef (coincidenceSubscribedInnerParent subscribed)
1930− return $ if outerHeight == invalidHeight || innerHeight == invalidHeight then invalidHeight else max outerHeight innerHeight
1932−data SomeSwitchSubscribed x = forall a. SomeSwitchSubscribed {-# NOUNPACK #-} (SwitchSubscribed x a)
1934−invalidate :: IORef [SomeSwitchSubscribed x] -> WeakList (Invalidator x) -> IO (WeakList (Invalidator x))
1935−invalidate toReconnectRef wis = do
1936− forM_ wis $ \wi -> do
1940− traceInvalidate "invalidate Dead"
1941− return () --TODO: Should we clean this up here?
1943− finalize wi -- Once something's invalidated, it doesn't need to hang around; this will change when some things are strict
1945− InvalidatorPull p -> do
1946− traceInvalidate $ "invalidate: Pull" <> showNodeId p
1947− mVal <- readIORef $ pullValue p
1948− forM_ mVal $ \val -> do
1949− writeIORef (pullValue p) Nothing
1950− writeIORef (pullSubscribedInvalidators val) =<< evaluate =<< invalidate toReconnectRef =<< readIORef (pullSubscribedInvalidators val)
1951− InvalidatorSwitch subscribed -> do
1952− traceInvalidate $ "invalidate: Switch" <> showNodeId subscribed
1953− modifyIORef' toReconnectRef (SomeSwitchSubscribed subscribed :)
1954− 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
1956−--------------------------------------------------------------------------------
1957−-- Reflex integration
1958−--------------------------------------------------------------------------------
1960−-- | The default, global Spider environment
1961−type Spider = SpiderEnv Global
1963−-- | Designates the default, global Spider timeline
1966−{-# NOINLINE globalSpiderEnv #-}
1967−globalSpiderEnv :: SpiderEnv Global
1968−globalSpiderEnv = unsafePerformIO unsafeNewSpiderEnv
1970−-- | Stores all global data relevant to a particular Spider timeline; only one
1971−-- value should exist for each type @x@
1972−data SpiderEnv x = SpiderEnv
1973− { _spiderEnv_toUnsubscribe :: !(IORef [SomeEventSubscription x])
1974− , _spiderEnv_lock :: !(MVar ())
1975− , _spiderEnv_cleanups :: !(IORef [IO ()])
1977− , _spiderEnv_depth :: !(IORef Int)
1980−type role SpiderEnv nominal
1982−instance GEq SpiderEnv where
1983− a `geq` b = if _spiderEnv_lock a == _spiderEnv_lock b
1984− then Just $ unsafeCoerce Refl -- This unsafeCoerce is safe because the same SpiderEnv can't have two different 'x' arguments
1987−unsafeNewSpiderEnv :: forall x. IO (SpiderEnv x)
1988−unsafeNewSpiderEnv = do
1989− toUnsubscribe <- newIORef []
1991− cleanups <- newIORef []
1993− depthRef <- newIORef 0
1996− { _spiderEnv_toUnsubscribe = toUnsubscribe
1997− , _spiderEnv_lock = lock
1998− , _spiderEnv_cleanups = cleanups
2000− , _spiderEnv_depth = depthRef
2004−-- | Create a new SpiderEnv
2005−newSpiderEnv :: IO (Some SpiderEnv)
2006−newSpiderEnv = Some.This <$> unsafeNewSpiderEnv
2008−newtype SpiderPullM x a = SpiderPullM (BehaviorM x a) deriving (Functor, Applicative, Monad, MonadIO, MonadFix)
2010−newtype SpiderPushM x a = SpiderPushM (ComputeM x a) deriving (Functor, Applicative, Monad, MonadIO, MonadFix)
2012−instance R.Reflex (SpiderEnv x) where
2013− newtype Behavior (SpiderEnv x) a = SpiderBehavior { unSpiderBehavior :: Behavior x a }
2014− newtype Event (SpiderEnv x) a = SpiderEvent { unSpiderEvent :: Event x a }
2015− newtype Dynamic (SpiderEnv x) a = SpiderDynamic { unSpiderDynamic :: Dynamic x Identity a } deriving (Functor, Applicative, Monad)
2016− newtype Incremental (SpiderEnv x) p a = SpiderIncremental { unSpiderIncremental :: Dynamic x p a }
2017− type PullM (SpiderEnv x) = SpiderPullM x
2018− type PushM (SpiderEnv x) = SpiderPushM x
2019− {-# INLINABLE never #-}
2020− never = SpiderEvent eventNever
2021− {-# INLINABLE constant #-}
2022− constant = SpiderBehavior . BehaviorConst
2023− {-# INLINABLE push #-}
2024− push f = SpiderEvent . push (coerce f) . unSpiderEvent
2025− {-# INLINABLE pull #-}
2026− pull = SpiderBehavior . pull . coerce
2027− {-# INLINABLE merge #-}
2028− merge = SpiderEvent . merge . DynamicConst . (coerce :: DMap k (R.Event (SpiderEnv x)) -> DMap k (Event x))
2029− {-# INLINABLE fan #-}
2030− fan e = R.EventSelector $ SpiderEvent . select (fan (unSpiderEvent e))
2031− {-# INLINABLE switch #-}
2032− switch = SpiderEvent . switch . (unsafeCoerce :: Behavior x (R.Event (SpiderEnv x) a) -> Behavior x (Event x a)) . unSpiderBehavior
2033− {-# INLINABLE coincidence #-}
2034− coincidence = SpiderEvent . coincidence . (coerce :: Event x (R.Event (SpiderEnv x) a) -> Event x (Event x a)) . unSpiderEvent
2035− {-# INLINABLE current #-}
2036− current = SpiderBehavior . current . unSpiderDynamic
2037− {-# INLINABLE updated #-}
2038− updated = SpiderEvent . fmap runIdentity . updated . unSpiderDynamic
2039− {-# INLINABLE unsafeBuildDynamic #-}
2040− unsafeBuildDynamic readV0 v' = SpiderDynamic $ DynamicDynIdentity $ unsafeDyn (coerce readV0) $ coerce $ unSpiderEvent v'
2041− {-# INLINABLE unsafeBuildIncremental #-}
2042− unsafeBuildIncremental readV0 dv = SpiderIncremental $ DynamicDyn $ unsafeDyn (coerce readV0) $ unSpiderEvent dv
2043− {-# INLINABLE mergeIncremental #-}
2044− mergeIncremental = SpiderEvent . merge . (unsafeCoerce :: Dynamic x R.PatchDMap (DMap k (R.Event (SpiderEnv x))) -> Dynamic x R.PatchDMap (DMap k (Event x))) . unSpiderIncremental
2045− {-# INLINABLE currentIncremental #-}
2046− currentIncremental = SpiderBehavior . current . unSpiderIncremental
2047− {-# INLINABLE updatedIncremental #-}
2048− updatedIncremental = SpiderEvent . updated . unSpiderIncremental
2049− {-# INLINABLE incrementalToDynamic #-}
2050− incrementalToDynamic (SpiderIncremental i) = SpiderDynamic $ DynamicDynIdentity $ unsafeDyn (readBehaviorUntracked $ current i) $ flip push (updated i) $ \p -> do
2051− c <- readBehaviorUntracked $ current i
2052− return $ Identity <$> R.apply p c --TODO: Avoid the redundant 'apply'
2054−instance R.MonadSample (SpiderEnv x) (EventM x) where
2055− {-# INLINABLE sample #-}
2056− sample (SpiderBehavior b) = readBehaviorUntracked b
2058−instance R.MonadHold (SpiderEnv x) (EventM x) where
2059− {-# INLINABLE hold #-}
2060− hold = holdSpiderEventM
2061− {-# INLINABLE holdDyn #-}
2062− holdDyn = holdDynSpiderEventM
2063− {-# INLINABLE holdIncremental #-}
2064− holdIncremental = holdIncrementalSpiderEventM
2066−holdSpiderEventM :: a -> R.Event (SpiderEnv x) a -> EventM x (R.Behavior (SpiderEnv x) a)
2067−holdSpiderEventM v0 e = fmap (SpiderBehavior . BehaviorHoldIdentity) $ hold v0 $ coerce $ unSpiderEvent e
2069−holdDynSpiderEventM :: a -> R.Event (SpiderEnv x) a -> EventM x (R.Dynamic (SpiderEnv x) a)
2070−holdDynSpiderEventM v0 e = fmap (SpiderDynamic . DynamicHoldIdentity) $ hold v0 $ coerce $ unSpiderEvent e
2072−holdIncrementalSpiderEventM :: R.Patch p => a -> R.Event (SpiderEnv x) (p a) -> EventM x (R.Incremental (SpiderEnv x) p a)
2073−holdIncrementalSpiderEventM v0 e = fmap (SpiderIncremental . DynamicHold) $ hold v0 $ unSpiderEvent e
2075−instance R.MonadHold (SpiderEnv x) (SpiderHost x) where
2076− {-# INLINABLE hold #-}
2077− hold v0 e = R.runHostFrame $ R.hold v0 e
2078− {-# INLINABLE holdDyn #-}
2079− holdDyn v0 e = R.runHostFrame $ R.holdDyn v0 e
2080− {-# INLINABLE holdIncremental #-}
2081− holdIncremental v0 e = R.runHostFrame $ R.holdIncremental v0 e
2083−instance R.MonadSample (SpiderEnv x) (SpiderHost x) where
2084− {-# INLINABLE sample #-}
2085− sample = runFrame . readBehaviorUntracked . unSpiderBehavior
2087−instance R.MonadSample (SpiderEnv x) (SpiderPullM x) where
2088− {-# INLINABLE sample #-}
2089− sample = coerce . readBehaviorTracked . unSpiderBehavior
2091−instance R.MonadSample (SpiderEnv x) (SpiderPushM x) where
2092− {-# INLINABLE sample #-}
2093− sample (SpiderBehavior b) = SpiderPushM $ readBehaviorUntracked b
2095−instance R.MonadHold (SpiderEnv x) (SpiderPushM x) where
2096− {-# INLINABLE hold #-}
2097− hold v0 e = R.current <$> R.holdDyn v0 e
2098− {-# INLINABLE holdDyn #-}
2099− holdDyn v0 (SpiderEvent e) = SpiderPushM $ fmap (SpiderDynamic . DynamicHoldIdentity) $ hold v0 $ coerce e
2100− {-# INLINABLE holdIncremental #-}
2101− holdIncremental v0 (SpiderEvent e) = SpiderPushM $ SpiderIncremental . DynamicHold <$> hold v0 e
2103−data RootTrigger x a = forall k. GCompare k => RootTrigger (WeakBag (Subscriber x a), IORef (DMap k Identity), k a)
2105−data SpiderEventHandle x a = SpiderEventHandle
2106− { spiderEventHandleSubscription :: EventSubscription x a
2107− , spiderEventHandleValue :: IORef (Maybe a)
2110−instance R.MonadSubscribeEvent (SpiderEnv x) (SpiderHostFrame x) where
2111− {-# INLINABLE subscribeEvent #-}
2112− subscribeEvent e = SpiderHostFrame $ do
2113− --TODO: Unsubscribe eventually (manually and/or with weak ref)
2114− val <- liftIO $ newIORef Nothing
2115− subscription <- subscribe (unSpiderEvent e) $ Subscriber
2116− { subscriberPropagate = \a -> do
2117− liftIO $ writeIORef val $ Just a
2119− , subscriberInvalidateHeight = \_ -> return ()
2120− , subscriberRecalculateHeight = \_ -> return ()
2122− return $ SpiderEventHandle
2123− { spiderEventHandleSubscription = subscription
2124− , spiderEventHandleValue = val
2127−instance R.ReflexHost (SpiderEnv x) where
2128− type EventTrigger (SpiderEnv x) = RootTrigger x
2129− type EventHandle (SpiderEnv x) = SpiderEventHandle x
2130− type HostFrame (SpiderEnv x) = SpiderHostFrame x
2132−instance R.MonadReadEvent (SpiderEnv x) (ReadPhase x) where
2133− {-# NOINLINE readEvent #-}
2134− readEvent h = ReadPhase $ fmap (fmap return) $ liftIO $ do
2135− result <- readIORef $ spiderEventHandleValue h
2139−instance MonadRef (EventM x) where
2140− type Ref (EventM x) = Ref IO
2141− {-# INLINABLE newRef #-}
2142− {-# INLINABLE readRef #-}
2143− {-# INLINABLE writeRef #-}
2144− newRef = liftIO . newRef
2145− readRef = liftIO . readRef
2146− writeRef r a = liftIO $ writeRef r a
2148−instance MonadAtomicRef (EventM x) where
2149− {-# INLINABLE atomicModifyRef #-}
2150− atomicModifyRef r f = liftIO $ atomicModifyRef r f
2152−-- | The monad for actions that manipulate a Spider timeline identified by @x@
2153−newtype SpiderHost x a = SpiderHost { unSpiderHost :: ReaderT (SpiderEnv x) IO a } deriving (Functor, Applicative, MonadFix, MonadIO, MonadException, MonadAsyncException)
2155−instance Monad (SpiderHost x) where
2156− {-# INLINABLE (>>=) #-}
2157− SpiderHost x >>= f = SpiderHost $ x >>= unSpiderHost . f
2158− {-# INLINABLE (>>) #-}
2159− SpiderHost x >> SpiderHost y = SpiderHost $ x >> y
2160− {-# INLINABLE return #-}
2161− return x = SpiderHost $ return x
2162− {-# INLINABLE fail #-}
2163− fail s = SpiderHost $ fail s
2165−-- | Run an action affecting the global Spider timeline; this will be guarded by
2166−-- a mutex for that timeline
2167−runSpiderHost :: SpiderHost Global a -> IO a
2168−runSpiderHost (SpiderHost a) = runReaderT a globalSpiderEnv
2170−newtype SpiderHostFrame x a = SpiderHostFrame { runSpiderHostFrame :: EventM x a } deriving (Functor, Applicative, MonadFix, MonadIO, MonadException, MonadAsyncException)
2172−instance Monad (SpiderHostFrame x) where
2173− {-# INLINABLE (>>=) #-}
2174− SpiderHostFrame x >>= f = SpiderHostFrame $ x >>= runSpiderHostFrame . f
2175− {-# INLINABLE (>>) #-}
2176− SpiderHostFrame x >> SpiderHostFrame y = SpiderHostFrame $ x >> y
2177− {-# INLINABLE return #-}
2178− return x = SpiderHostFrame $ return x
2179− {-# INLINABLE fail #-}
2180− fail s = SpiderHostFrame $ fail s
2182−instance R.MonadSample (SpiderEnv x) (SpiderHostFrame x) where
2183− sample = SpiderHostFrame . readBehaviorUntracked . unSpiderBehavior --TODO: This can cause problems with laziness, so we should get rid of it if we can
2185−instance R.MonadHold (SpiderEnv x) (SpiderHostFrame x) where
2186− {-# INLINABLE hold #-}
2187− hold v0 e = SpiderHostFrame $ fmap (SpiderBehavior . BehaviorHoldIdentity) $ hold v0 $ coerce $ unSpiderEvent e
2188− {-# INLINABLE holdDyn #-}
2189− holdDyn v0 e = SpiderHostFrame $ fmap (SpiderDynamic . DynamicHoldIdentity) $ hold v0 $ coerce $ unSpiderEvent e
2190− {-# INLINABLE holdIncremental #-}
2191− holdIncremental v0 e = SpiderHostFrame $ fmap (SpiderIncremental . DynamicHold) $ hold v0 $ unSpiderEvent e
2193−newEventWithTriggerIO :: (RootTrigger x a -> IO (IO ())) -> IO (Event x a)
2194−newEventWithTriggerIO f = do
2195− es <- newFanEventWithTriggerIO $ \Refl -> f
2196− return $ select es Refl
2198−newFanEventWithTriggerIO :: GCompare k => (forall a. k a -> RootTrigger x a -> IO (IO ())) -> IO (EventSelector x k)
2199−newFanEventWithTriggerIO f = do
2200− occRef <- newIORef DMap.empty
2201− subscribedRef <- newIORef DMap.empty
2203− { rootOccurrence = occRef
2204− , rootSubscribed = subscribedRef
2207− return $ EventSelector $ \k -> eventRoot k r
2209−instance R.MonadReflexCreateTrigger (SpiderEnv x) (SpiderHost x) where
2210− newEventWithTrigger = SpiderHost . lift . fmap SpiderEvent . newEventWithTriggerIO
2211− newFanEventWithTrigger f = SpiderHost $ lift $ do
2212− es <- newFanEventWithTriggerIO f
2213− return $ R.EventSelector $ SpiderEvent . select es
2215−instance R.MonadReflexCreateTrigger (SpiderEnv x) (SpiderHostFrame x) where
2216− newEventWithTrigger = SpiderHostFrame . EventM . liftIO . fmap SpiderEvent . newEventWithTriggerIO
2217− newFanEventWithTrigger f = SpiderHostFrame $ EventM $ liftIO $ do
2218− es <- newFanEventWithTriggerIO f
2219− return $ R.EventSelector $ SpiderEvent . select es
2221−instance R.MonadSubscribeEvent (SpiderEnv x) (SpiderHost x) where
2222− {-# INLINABLE subscribeEvent #-}
2223− subscribeEvent = runFrame . runSpiderHostFrame . R.subscribeEvent
2225−newtype ReadPhase x a = ReadPhase (ResultM x a) deriving (Functor, Applicative, Monad, MonadFix)
2227−instance R.MonadSample (SpiderEnv x) (ReadPhase x) where
2228− {-# INLINABLE sample #-}
2229− sample = ReadPhase . R.sample
2231−instance R.MonadHold (SpiderEnv x) (ReadPhase x) where
2232− {-# INLINABLE hold #-}
2233− hold v0 e = ReadPhase $ R.hold v0 e
2234− {-# INLINABLE holdDyn #-}
2235− holdDyn v0 e = ReadPhase $ R.holdDyn v0 e
2236− {-# INLINABLE holdIncremental #-}
2237− holdIncremental v0 e = ReadPhase $ R.holdIncremental v0 e
2239−instance R.MonadReflexHost (SpiderEnv x) (SpiderHost x) where
2240− type ReadPhase (SpiderHost x) = ReadPhase x
2241− fireEventsAndRead es (ReadPhase a) = run es a
2242− runHostFrame = runFrame . runSpiderHostFrame
2244−instance MonadRef (SpiderHost x) where
2245− type Ref (SpiderHost x) = Ref IO
2246− newRef = SpiderHost . newRef
2247− readRef = SpiderHost . readRef
2248− writeRef r = SpiderHost . writeRef r
2250−instance MonadAtomicRef (SpiderHost x) where
2251− atomicModifyRef r = SpiderHost . atomicModifyRef r
2253−instance MonadRef (SpiderHostFrame x) where
2254− type Ref (SpiderHostFrame x) = Ref IO
2255− newRef = SpiderHostFrame . newRef
2256− readRef = SpiderHostFrame . readRef
2257− writeRef r = SpiderHostFrame . writeRef r
2259−instance MonadAtomicRef (SpiderHostFrame x) where
2260− atomicModifyRef r = SpiderHostFrame . atomicModifyRef r