future-resource (empty) → 0.3.0.0

raw patch · 4 files changed

+288/−0 lines, 4 filesdep +basesetup-changed

Dependencies added: base

Files

• Control/Future.hs +96/−0
• LICENSE +165/−0
• Setup.hs +2/−0
• future-resource.cabal +25/−0

@@ -0,0 +1,96 @@+{-# LANGUAGE DeriveFunctor #-}+-- | Similar to async package, however, suitable for manual threading+-- and go without exceptions.+module Control.Future where+import Control.Applicative+import Control.Concurrent+import Data.IORef++data Progress a b = Making | Fixme a | Finished b+	deriving (Functor, Show)++-- | Two kinds of future is possible:+-- (i) A pile of failures [a] and (ii) Successful result b.+newtype Future a b = Future { runFuture :: IO (Progress [a] b) }++instance Functor (Future a) where+	fmap f (Future a) = Future $ (fmap.fmap) f a++instance Applicative (Future a) where+	pure = Future . return . Finished+	Future fs <*> Future as =+		Future $ do+			fs' <- fs+			as' <- as+			return $ case (fs', as') of+				(Finished f, Finished a) -> Finished $ f a+				(Fixme f, Finished _) -> Fixme f+				(Finished _, Fixme a) -> Fixme a+				(Fixme f, Fixme a) -> Fixme (f ++ a)+				_ -> Making++instance Alternative (Future a) where+	empty = Future $ return Making+	Future as <|> Future bs =+		Future $ do+			as' <- as+			case as' of+				Finished _ -> return as'+				_ -> bs++instance Monad (Future a) where+	return = pure+	Future m >>= f =+		Future $ do+			m' <- m+			case m' of+				Finished x -> runFuture (f x)+				Fixme l -> return (Fixme l)+				Making -> return Making++type Future' = Future String++-- | Wait until future comes, and modify failure history.+forceFuture :: Future a b -> ([a] -> IO b) -> IO b+forceFuture fu@(Future fs) f = do+	fs' <- fs+	case fs' of+		Finished r -> return r+		Fixme l -> f l+		Making -> threadDelay 1000 >> forceFuture fu f++-- | Just wait for the future honestly.+waitFuture :: Future a b -> IO (Progress [a] b)+waitFuture fu@(Future fs) = do+	fs' <- fs+	case fs' of+		Making -> threadDelay 1000 >> waitFuture fu+		otherwise -> return fs'++-- | Return 'Just' when it is time. The history may be modified.+maybeChance :: Future a b -> ([a] -> IO b) -> IO (Maybe b)+maybeChance (Future fs) f = do+	fs' <- fs+	case fs' of+		Finished r -> return $ Just r+		Fixme l -> f l >>= return . Just+		Making -> return Nothing++-- | If it is too early, immediately returns 'Making'.+eitherChance :: Future a b -> IO (Progress [a] b)+eitherChance (Future fs) = fs++-- | > asyncIO $ \update -> forkIO (doSth >>= update)+asyncIO :: ((Progress [a] b -> IO ()) -> IO ()) -> IO (Future a b)+asyncIO makeThread = do+	ref <- newIORef Making+	makeThread (writeIORef ref)+	return $ Future $ readIORef ref++-- | Run an action created in given 'Future' if it is available now.+runAction :: Future a (IO b) -> IO ()+runAction (Future fs) = do+	fs' <- fs+	case fs' of+		Finished run -> run >> return ()+		otherwise -> return ()

@@ -0,0 +1,165 @@+                  GNU LESSER GENERAL PUBLIC LICENSE+                       Version 3, 29 June 2007++ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>+ Everyone is permitted to copy and distribute verbatim copies+ of this license document, but changing it is not allowed.+++  This version of the GNU Lesser General Public License incorporates+the terms and conditions of version 3 of the GNU General Public+License, supplemented by the additional permissions listed below.++  0. 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@@ -0,0 +1,2 @@+import Distribution.Simple+main = defaultMain

@@ -0,0 +1,25 @@+name:                future-resource+version:             0.3.0.0+synopsis:            realtime resource handling with manual concurrency+description:         Similar to async package, lazy resource loading framework for GUI applications+license:             LGPL-3+license-file:        LICENSE+author:              capsjac+maintainer:          capsjac+-- copyright:           +category:            Control+build-type:          Simple+-- extra-source-files:  +cabal-version:       >=1.10++source-repository head+  type:              git+  location:          https://github.com/capsjac/future-resource++library+  exposed-modules:     Control.Future+  -- other-modules:       +  -- other-extensions:    +  build-depends:       base >=4.7 && <4.8+  -- hs-source-dirs:      +  default-language:    Haskell2010