Happstack.State.Saver

Documentation

data ReaderStream a

Constructors

ReaderStream

Fields

readerClose :: IO ()

readerGet :: IO ([a], Int)

readerGetUncut :: IO [a]

data WriterStream a

Constructors

WriterStream

Fields

writerClose :: IO ()

writerAdd :: a -> IO () -> IO ()

writerAtomicReplace :: a -> IO ()

writerCut :: IO Int

type PrefixLock = (FilePath, Handle)

data Saver

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)

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

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

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

obtainLock :: Saver -> IO (Maybe PrefixLock)

releaseLock :: Maybe PrefixLock -> IO ()