gameServer/Store.hs
author nemo
Wed, 29 Aug 2012 11:48:10 -0400
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{-# LANGUAGE BangPatterns, GeneralizedNewtypeDeriving #-}
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module Store(
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    ElemIndex(),
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    MStore(),
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    IStore(),
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    newStore,
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    addElem,
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    removeElem,
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    readElem,
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    writeElem,
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    modifyElem,
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    elemExists,
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    firstIndex,
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    indicesM,
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    withIStore,
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    withIStore2,
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    (!),
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    indices
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    ) where
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import qualified Data.Array.IArray as IA
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import qualified Data.Array.IO as IOA
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import qualified Data.IntSet as IntSet
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import Data.IORef
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import Control.Monad
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import Control.DeepSeq
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newtype ElemIndex = ElemIndex Int
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    deriving (Eq, Show, Read, Ord, NFData)
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newtype MStore e = MStore (IORef (IntSet.IntSet, IntSet.IntSet, IOA.IOArray Int e))
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newtype IStore e = IStore (IntSet.IntSet, IA.Array Int e)
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firstIndex :: ElemIndex
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firstIndex = ElemIndex 0
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-- MStore code
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initialSize :: Int
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initialSize = 16
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growFunc :: Int -> Int
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growFunc a = a * 3 `div` 2
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truncFunc :: Int -> Int
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truncFunc a | a > growFunc initialSize = (a `div` 2)
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            | otherwise = a
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newStore :: IO (MStore e)
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newStore = do
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    newar <- IOA.newArray_ (0, initialSize - 1)
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    new <- newIORef (IntSet.empty, IntSet.fromAscList [0..initialSize - 1], newar)
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    return (MStore new)
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growStore :: MStore e -> IO ()
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growStore (MStore ref) = do
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    (busyElems, freeElems, arr) <- readIORef ref
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    (_, m') <- IOA.getBounds arr
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    let newM' = growFunc (m' + 1) - 1
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    newArr <- IOA.newArray_ (0, newM')
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    sequence_ [IOA.readArray arr i >>= IOA.writeArray newArr i | i <- [0..m']]
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    writeIORef ref (busyElems, freeElems `IntSet.union` IntSet.fromAscList [m'+1..newM'], newArr)
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growIfNeeded :: MStore e -> IO ()
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growIfNeeded m@(MStore ref) = do
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    (_, freeElems, _) <- readIORef ref
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    when (IntSet.null freeElems) $ growStore m
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truncateIfNeeded :: MStore e -> IO ()
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truncateIfNeeded (MStore ref) = do
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    (busyElems, _, arr) <- readIORef ref
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    (_, m') <- IOA.getBounds arr
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    let newM' = truncFunc (m' + 1) - 1
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    when (newM' < m' && (not $ IntSet.null busyElems) && IntSet.findMax busyElems <= newM') $ do
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        newArr <- IOA.newArray_ (0, newM')
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        sequence_ [IOA.readArray arr i >>= IOA.writeArray newArr i | i <- IntSet.toList busyElems]
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        writeIORef ref (busyElems, IntSet.fromAscList [0..newM'] `IntSet.difference` busyElems, newArr)
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addElem :: MStore e -> e -> IO ElemIndex
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addElem m@(MStore ref) element = do
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    growIfNeeded m
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    (busyElems, freeElems, arr) <- readIORef ref
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    let (!n, freeElems') = IntSet.deleteFindMin freeElems
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    IOA.writeArray arr n element
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    writeIORef ref (IntSet.insert n busyElems, freeElems', arr)
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    return $ ElemIndex n
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removeElem :: MStore e -> ElemIndex -> IO ()
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removeElem m@(MStore ref) (ElemIndex n) = do
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    (busyElems, freeElems, arr) <- readIORef ref
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    IOA.writeArray arr n (error $ "Store: no element " ++ show n)
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    writeIORef ref (IntSet.delete n busyElems, IntSet.insert n freeElems, arr)
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    truncateIfNeeded m
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readElem :: MStore e -> ElemIndex -> IO e
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readElem (MStore ref) (ElemIndex n) = readIORef ref >>= \(_, _, arr) -> IOA.readArray arr n
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writeElem :: MStore e -> ElemIndex -> e -> IO ()
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writeElem (MStore ref) (ElemIndex n) el = readIORef ref >>= \(_, _, arr) -> IOA.writeArray arr n el
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modifyElem :: MStore e -> (e -> e) -> ElemIndex -> IO ()
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modifyElem (MStore ref) f (ElemIndex n) = do
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    (_, _, arr) <- readIORef ref
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    IOA.readArray arr n >>= IOA.writeArray arr n . f
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elemExists :: MStore e -> ElemIndex -> IO Bool
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elemExists (MStore ref) (ElemIndex n) = do
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    (_, !free, _) <- readIORef ref
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    return $ n `IntSet.notMember` free
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indicesM :: MStore e -> IO [ElemIndex]
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indicesM (MStore ref) = do
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    (!busy, _, _) <- readIORef ref
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    return $ map ElemIndex $ IntSet.toList busy
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-- A way to see MStore elements in pure code via IStore
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m2i :: MStore e -> IO (IStore e)
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m2i (MStore ref) = do
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    (a, _, c') <- readIORef ref
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    c <- IOA.unsafeFreeze c'
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    return $ IStore (a, c)
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i2m :: MStore e -> IStore e -> IO ()
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i2m (MStore ref) (IStore (_, arr)) = do
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    (b, e, _) <- readIORef ref
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    a <- IOA.unsafeThaw arr
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    writeIORef ref (b, e, a)
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withIStore :: MStore e -> (IStore e -> a) -> IO a
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withIStore m f = do
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    i <- m2i m
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    let res = f i
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    res `seq` i2m m i
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    return res
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withIStore2 :: MStore e1 -> MStore e2 -> (IStore e1 -> IStore e2 -> a) -> IO a
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withIStore2 m1 m2 f = do
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    i1 <- m2i m1
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    i2 <- m2i m2
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    let res = f i1 i2
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    res `seq` i2m m1 i1
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    i2m m2 i2
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    return res
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-- IStore code
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(!) :: IStore e -> ElemIndex -> e
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(!) (IStore (_, arr)) (ElemIndex i) = (IA.!) arr i
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indices :: IStore e -> [ElemIndex]
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indices (IStore (busy, _)) = map ElemIndex $ IntSet.toList busy