mirror of https://github.com/voidlizard/hbs2
50 lines
1.5 KiB
Haskell
50 lines
1.5 KiB
Haskell
{-# Language MultiWayIf #-}
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module HBS2.Storage.NCQ3.Internal.Memtable where
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import HBS2.Storage.NCQ3.Internal.Types
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import HBS2.Storage.NCQ3.Internal.Prelude
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import Data.ByteString qualified as BS
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import Data.HashMap.Strict qualified as HM
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import Data.Vector qualified as V
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import Control.Concurrent.STM qualified as STM
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ncqShardIdx :: NCQStorage -> HashRef -> Int
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ncqShardIdx NCQStorage{..} h =
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fromIntegral (BS.head (coerce h)) `mod` V.length ncqMemTable
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{-# INLINE ncqShardIdx #-}
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ncqGetShard :: NCQStorage -> HashRef -> Shard
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ncqGetShard ncq@NCQStorage{..} h = ncqMemTable ! ncqShardIdx ncq h
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{-# INLINE ncqGetShard #-}
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ncqLookupEntrySTM :: NCQStorage -> HashRef -> STM (Maybe NCQEntry)
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ncqLookupEntrySTM ncq h = readTVar (ncqGetShard ncq h) <&> HM.lookup h
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ncqAlterEntrySTM :: NCQStorage
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-> HashRef
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-> (Maybe NCQEntry -> Maybe NCQEntry)
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-> STM ()
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ncqAlterEntrySTM ncq h alterFn = do
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let shard = ncqGetShard ncq h
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modifyTVar shard (HM.alter alterFn h)
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ncqStorageSync :: forall m . MonadUnliftIO m => NCQStorage -> m ()
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ncqStorageSync NCQStorage{..} = atomically $ writeTVar ncqSyncReq True
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ncqOperation :: MonadIO m => NCQStorage -> m a -> m a -> m a
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ncqOperation NCQStorage{..} m0 m = do
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what <- atomically do
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alive <- readTVar ncqAlive
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stop <- readTVar ncqStopReq
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if | not alive && not stop -> STM.retry
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| not alive && stop -> pure False
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| otherwise -> pure True
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if what then m else m0
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