tbox (empty) → 0.0.0
raw patch · 7 files changed
+821/−0 lines, 7 filesdep +basedep +binarydep +cautious-filesetup-changed
Dependencies added: base, binary, cautious-file, directory, filepath, mtl, stm-io-hooks
Files
- Control/Concurrent/TBox.hs +27/−0
- Control/Concurrent/TBox/Class.hs +50/−0
- Control/Concurrent/TBox/Operations.hs +66/−0
- Control/Concurrent/TFile.hs +116/−0
- LICENSE +508/−0
- Setup.lhs +4/−0
- tbox.cabal +50/−0
+ Control/Concurrent/TBox.hs view
@@ -0,0 +1,27 @@+-----------------------------------------------------------------------------+-- |+-- Module : Control.Concurrent.TBox+-- Copyright : Peter Robinson 2009+-- License : LGPL+--+-- Maintainer : Peter Robinson <thaldyron@gmail.com>+-- Stability : experimental+-- Portability : non-portable (requires STM)+--+-- An abstract interface for transactional variables with IO hooks.+-- +--+-----------------------------------------------------------------------------+module Control.Concurrent.TBox( -- * TBox type class+ TBox(..),+ -- * Operations on a TBox+ read,+ write,+ delete,+ isEmpty,+ )+ +where+import Control.Concurrent.TBox.Class+import Control.Concurrent.TBox.Operations+import Prelude hiding (read,readIO)
+ Control/Concurrent/TBox/Class.hs view
@@ -0,0 +1,50 @@+-----------------------------------------------------------------------------+-- |+-- Module : Control.Concurrent.TBox.Class+-- Copyright : Peter Robinson 2009+-- License : LGPL+--+-- Maintainer : Peter Robinson <thaldyron@gmail.com>+-- Stability : experimental+-- Portability : non-portable (requires STM)+--+-- The type class 'TBox'.+-- +--+-----------------------------------------------------------------------------+module Control.Concurrent.TBox.Class+where+import Control.Concurrent.AdvSTM+import Prelude hiding(readIO)++--------------------------------------------------------------------------------+-- | An instance of 'TBox' is a (Adv)STM variable that might contain a value of +-- some type 'a'. In contrast to a plain 'TVar', a +-- 'TBox' has IO hooks that are executed transparently on updates and reads.+-- The functions of the type class shouldn't be exposed directly but should be used via+-- the interface defined in the module 'TBox.Operations'.+-- +-- See the module 'TFile' for a concrete instantiation.+class TBox t a where+ writeSTM :: t a -> a -> AdvSTM ()+ writeIO :: t a -> a -> IO () ++ readSTM :: t a -> AdvSTM (Maybe a)+ -- | Note: Might be executed multiple times for the+ -- same 'TBox' in a single transaction. See 'unsafeRetryWith'.+ readIO :: t a -> IO (Maybe a)++ deleteSTM :: t a -> AdvSTM ()+ deleteIO :: t a -> IO ()++ -- | If 'isDirty' yields 'True', the 'readIO' hook will be run on the next+ -- read.+ isDirty :: t a -> AdvSTM Bool+ setDirty :: t a -> Bool -> AdvSTM ()++-- modifySTM :: t a -> (a -> a) -> AdvSTM ()+-- modifySTM t f = readSTM t >>= writeSTM t . f+-- modifyIO :: t a -> (a -> a) -> AdvSTM ()+-- modifyIO t f = readIO t >>= ++
+ Control/Concurrent/TBox/Operations.hs view
@@ -0,0 +1,66 @@+-----------------------------------------------------------------------------+-- |+-- Module : Control.Concurrent.TBox.Operations+-- Copyright : Peter Robinson 2009+-- License : LGPL+--+-- Maintainer : Peter Robinson <thaldyron@gmail.com>+-- Stability : experimental+-- Portability : non-portable (requires STM)+--+-- Operations on instances of 'TBox'.+--+-----------------------------------------------------------------------------+module Control.Concurrent.TBox.Operations+where+import Control.Concurrent.TBox.Class+import Control.Monad+import Control.Concurrent.AdvSTM+import Data.Maybe++import Prelude hiding(lookup,catch,null,read,readIO,writeFile)+++--------------------------------------------------------------------------------++-- | Deletes the content.+delete :: (TBox t a) => t a -> AdvSTM ()+delete tbox = do+ deleteSTM tbox + setDirty tbox False+ onCommit $ deleteIO tbox++-- | Writes the new content.+write :: (TBox t a) => t a -> a -> AdvSTM ()+write tbox a = do+ writeSTM tbox a + setDirty tbox False+ onCommit $ writeIO tbox a++-- | If the TBox is dirty, this retries the transaction and+-- rereads the content using 'readIO' in a separate thread.+-- Otherwise it simply returns the result of 'readSTM'.+--+-- Note: Depending on the implementation, careless +-- use of 'setDirty' and 'read' in the same transaction might lead+-- to nonterminating retry loops.+read :: TBox t a => t a -> AdvSTM (Maybe a)+read tbox = do+ dirty <- isDirty tbox+ if dirty + then unsafeRetryWith $ do + mvalIO <- readIO tbox + atomically $ do+ stillDirty <- isDirty tbox+ when stillDirty $ do+ setDirty tbox False+ case mvalIO of+ Nothing -> deleteSTM tbox + Just v -> writeSTM tbox v + else + readSTM tbox++-- | Returns 'True' iff the 'TBox' is empty.+isEmpty :: TBox t a => t a -> AdvSTM Bool+isEmpty = liftM isJust . readSTM +
+ Control/Concurrent/TFile.hs view
@@ -0,0 +1,116 @@+-----------------------------------------------------------------------------+-- |+-- Module : Control.Concurrent.TFile+-- Copyright : Peter Robinson 2009+-- License : LGPL+--+-- Maintainer : Peter Robinson <thaldyron@gmail.com>+-- Stability : experimental+-- Portability : non-portable (requires STM)+--+-- +-- A transactional variable that writes its content to a file on each update.+-- +-- This module should be imported qualified.+--+-----------------------------------------------------------------------------+module Control.Concurrent.TFile( -- * Data type+ TFile,+ -- * Construction+ newEmptyIO,+ newIO,+ new,+ -- * Operations+ read,+ write,+ delete,+ isEmpty+ )+++where+import Control.Concurrent.TBox.Class+import Control.Concurrent.TBox.Operations++import Data.Binary+import Data.Typeable+import Control.Concurrent.AdvSTM.TMVar+import Control.Concurrent.AdvSTM+import Control.Concurrent.AdvSTM.TVar+import Control.Monad+import Control.Exception ++import System.Directory+import System.IO.Error hiding(catch)+import System.IO.Cautious(writeFileL)++import Prelude hiding(lookup,catch,null,read,readIO,writeFile)++--------------------------------------------------------------------------------+-- | A transactional variable that writes its content to a file on each update.+--+-- * The updated memory content of the TFile is not visible to other threads+-- until the file has been written successfully. +--+-- * If the 'TFile' is \"dirty\", the content is (re)read from the file on the next+-- 'read'.+--+data TFile a = TF + { filepath :: FilePath+ , tfileTVar :: TVar (Maybe a)+ , dirtyTVar :: TVar Bool+ , fileLock :: TMVar () + }+ deriving(Typeable)++-- | Constructs an initially empty 'TFile' that is marked dirty. +-- That means, on the next 'read', the contents of the provided file (if it+-- exists) will be loaded into the 'TFile'.+newEmptyIO :: Binary a => FilePath -> IO (TFile a)+newEmptyIO fp = + TF fp `liftM` newTVarIO Nothing + `ap` (newTVarIO =<< doesFileExist fp)+ `ap` newTMVarIO ()++newIO :: Binary a => FilePath -> a -> IO (TFile a)+newIO fp = atomically . new fp++new :: Binary a => FilePath -> a -> AdvSTM (TFile a)+new fp a = do+ tbox <- TF fp `liftM` newTVar (Just a) + `ap` newTVar False + `ap` newTMVar ()+ write tbox a+ return tbox++instance Binary a => TBox TFile a where+ writeSTM tbox = writeTVar (tfileTVar tbox) . Just ++ writeIO (TF fp _ _ lock) = withTMVar lock . const . writeFileL fp . encode ++ readSTM = readTVar . tfileTVar ++ readIO (TF fp _ _ lock) = (do+ a <- withTMVar lock $ const $ decodeFile fp+ return $ Just a)+ `catch` \(e::IOException) -> + if isDoesNotExistError e then return Nothing else throw e++ deleteSTM tbox = writeTVar (tfileTVar tbox) Nothing++ deleteIO (TF fp _ _ lock) = withTMVar lock $ const $ removeFile fp+ `catch` \(e::IOException) -> unless (isDoesNotExistError e) $ throw e++ isDirty = readTVar . dirtyTVar + setDirty = writeTVar . dirtyTVar ++withTMVar :: TMVar a -> (a -> IO b) -> IO b+withTMVar tmvar ioac = do+ a <- atomically $ takeTMVar tmvar+ res <- ioac a+ atomically $ putTMVar tmvar a+ return res++--------------------------------------------------------------------------------++
+ LICENSE view
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+ Setup.lhs view
@@ -0,0 +1,4 @@+#! /usr/bin/env runhaskell++> import Distribution.Simple+> main = defaultMain
+ tbox.cabal view
@@ -0,0 +1,50 @@+Name: tbox+Synopsis: Transactional variables with IO hooks+Description:+ (to be expanded...)+ .+ This package provides transactional variables with IO hooks. + See module 'Control.Concurrent.TFile' for a concrete instance. + .+ Feedback appreciated!++Author: Peter Robinson 2009+Maintainer: Peter Robinson <thaldyron@gmail.com>+License: LGPL+License-file: LICENSE+Version: 0.0.0+Category: Data, Concurrency+Stability: experimental+Homepage: http://darcs.monoid.at/tbox++build-type: Simple +cabal-version: >= 1.2.3+library+ ghc-options: -Wall -fno-ignore-asserts -fwarn-incomplete-patterns++ exposed-modules: Control.Concurrent.TBox+ Control.Concurrent.TBox.Class+ Control.Concurrent.TBox.Operations+ Control.Concurrent.TFile++-- other-modules: test.hs++ build-depends: base >= 4 && < 5, + stm-io-hooks >= 0.5.0 && < 0.6, + mtl >= 1.1.0.2 && < 1.2,+ binary >= 0.5 && < 0.6,+ filepath >= 1.1 && < 1.2,+ directory >= 1.0.0.3 && < 1.1,+ cautious-file >= 0.1.5 && < 0.2+-- containers >= 0.2.0.1 && < 0.3++ extensions: MultiParamTypeClasses,+-- RankNTypes, +-- FunctionalDependencies, +-- FlexibleContexts,+ FlexibleInstances,+-- UndecidableInstances,+ DeriveDataTypeable,+ ScopedTypeVariables+-- TypeSynonymInstances+