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|
{-# LANGUAGE ExistentialQuantification #-}
module Phi.Phi ( Phi
, MessageBus
, Message
, fromMessage
, initPhi
, runPhi
, sendMessage
, getMessageBus
, receiveMessage
) where
import Control.Concurrent.Chan
import Control.Monad
import Data.Typeable
data Phi = Phi (Chan Message)
data MessageBus = MessageBus (Chan Message)
data Message = forall a. (Typeable a, Show a) => Message a
fromMessage :: (Typeable a, Show a) => Message -> Maybe a
fromMessage (Message m) = cast m
initPhi :: IO Phi
initPhi = liftM Phi newChan
runPhi :: Phi -> IO ()
runPhi (Phi chan) = forever $ readChan chan
sendMessage :: (Typeable a, Show a) => Phi -> a -> IO ()
sendMessage (Phi chan) = writeChan chan . Message
getMessageBus :: Phi -> IO MessageBus
getMessageBus (Phi chan) = liftM MessageBus $ dupChan chan
receiveMessage :: MessageBus -> IO Message
receiveMessage (MessageBus chan) = readChan chan
|
