happstack-state-0.3.4: Event-based distributed state. Source code Contents Index

Happstack.State.Saver

Synopsis

data ReaderStream a = ReaderStream { readerClose :: IO () readerGet :: IO ([a], Int) readerGetUncut :: IO [a] } data WriterStream a = WriterStream { writerClose :: IO () writerAdd :: a -> IO () -> IO () writerAtomicReplace :: a -> IO () writerCut :: IO Int } type PrefixLock = (FilePath, Handle) data Saver = NullSaver | FileSaver String | Queue Saver | Memory (MVar Store) createReader :: Serialize a => Saver -> String -> Int -> IO (ReaderStream a) createWriter :: Serialize a => Saver -> String -> Int -> IO (WriterStream a) obtainLock :: Saver -> IO (Maybe PrefixLock) releaseLock :: Maybe PrefixLock -> IO ()

Documentation

data ReaderStream a Source

Constructors ReaderStream readerClose :: IO () readerGet :: IO ([a], Int) readerGetUncut :: IO [a]

data WriterStream a Source

Constructors WriterStream writerClose :: IO () writerAdd :: a -> IO () -> IO () writerAtomicReplace :: a -> IO () writerCut :: IO Int

type PrefixLock = (FilePath, Handle) Source

data Saver Source

Constructors NullSaver A saver that discards all output FileSaver String A saver that operates on files. The parameter is the prefix for the files. Queue Saver Enable queueing. Memory (MVar Store)

createReader :: Serialize a => Saver -> String -> Int -> IO (ReaderStream a) Source

Dispatches over the Saver type provided to return a ReaderStream for the inferred type.

createWriter :: Serialize a => Saver -> String -> Int -> IO (WriterStream a) Source

Dispatches over the Saver type provided to return a WriterStream for the inferred type.

obtainLock :: Saver -> IO (Maybe PrefixLock) Source

releaseLock :: Maybe PrefixLock -> IO () Source

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