Safe Haskell	None
Language	Haskell98

Updater.Internal

Synopsis

Documentation

newtype Event a Source

Push based Updater.

Constructors

Event
Fields getEvent' :: Updater a

Instances

Alternative Event
Monad Event
Functor Event
Applicative Event
Monoid (Event a)

newtype Behavior a Source

Pull based Updater

Constructors

Behavior
Fields getBehavior' :: Updater a

Instances

Monad Behavior
Functor Behavior
MonadFix Behavior
Applicative Behavior

newtype Updater a Source

This monad works very similar to a continuation monad on top of stm. You can do any basic stm computation you want simply using liftSTM. However, if you use getEvent everything after that call will be executed everytime the Signal given to getEvent is changed.

You can also use the Alternative instance to make a union of events.

You can also use the Applicative instance to run two things 'parallel'. Parallel meaning that events on one side will not cause the other side to be reevaluated completely.

Constructors

Updater
Fields runUpdater' :: (a -> DownState -> IO UpState) -> DownState -> IO UpState

Instances

Alternative Updater
Monad Updater
Functor Updater
MonadFix Updater
Applicative Updater

newEvent' :: IO (Updater a, a -> IO ()) Source

cacheStateless' :: Updater a -> Updater (Updater a) Source

cacheStateful' :: Updater a -> Updater (Updater a) Source

runUpdater :: Updater (Either (IO ()) res) -> IO res Source

unsafeLiftIO :: IO a -> Behavior a Source

Don't execute the io-action returned by newEvent. Also, fork; don't block.

debug :: String -> Behavior () Source

Just for some quick debugging

putLine = unsafeLiftIO . putStrLn

debugCleanup :: String -> Behavior () Source

This can be useful to spot when listeners are removed.

onCommit :: IO () -> Behavior () Source

justOne :: Updater a -> Updater a Source

data UpState Source

Constructors

UpState
Fields stateOnCleanup :: IO () stateOnCommit :: IO ()

Instances

Monoid UpState

data DownState Source

Constructors

DownState