-- Hoogle documentation, generated by Haddock
-- See Hoogle, http://www.haskell.org/hoogle/


-- | A Cached variable for IO functions.
--   
--   This package allows for caching IO functions, either on a timeout or
--   designed to only fetch once.
@package Concurrent-Cache
@version 0.2.2.2

module Control.Concurrent.Cache
data CachedData a

-- | Fetch data from a cache @since 0.1.0.0
fetch :: CachedData a -> IO (a)

-- | Only fetch data if it has been cached. @since 0.2.1.0
fetchCached :: CachedData a -> IO (Maybe a)

-- | Create a cache which will execute an (IO ()) function on demand a
--   maximum of 1 times. @since 0.2.0.0
createReadOnceCache :: IO (a) -> IO (CachedData a)

-- | Create a cache with a timeout from an (IO ()) function. @since 0.2.0.0
createTimedCache :: Int -> Bool -> IO (a) -> IO (CachedData a)

-- | Create a cache variable which simply holds a value with no actual
--   caching at all. @since 0.2.2.2
createCachePassthrough :: a -> CachedData a