Safe Haskell	None
Language	Haskell2010

FoundationDB.Layer.Directory.Internal.HCA

Synopsis

oneBytes :: ByteString
data HCA = HCA {
- counters :: Subspace
- recent :: Subspace
}
newHCA :: Subspace -> HCA
windowSize :: Int -> Int
globalAllocateLock :: MVar ()
withAllocLock :: Transaction a -> Transaction a
findStartAndWindow :: HCA -> Bool -> Int -> Transaction (Int, Int)
findSubspaceLoop :: HCA -> Subspace -> Int -> Int -> Transaction (Maybe Subspace)
initStart :: HCA -> Transaction Int
allocate :: HCA -> Subspace -> Transaction Subspace

Documentation

oneBytes :: ByteString Source #

data HCA Source #

Constructors

HCA
Fields counters :: Subspace recent :: Subspace

Instances

Instances details

Eq HCA Source #
Instance details Defined in FoundationDB.Layer.Directory.Internal.HCA Methods (==) :: HCA -> HCA -> Bool # (/=) :: HCA -> HCA -> Bool #
Ord HCA Source #
Instance details Defined in FoundationDB.Layer.Directory.Internal.HCA Methods compare :: HCA -> HCA -> Ordering # (<) :: HCA -> HCA -> Bool # (<=) :: HCA -> HCA -> Bool # (>) :: HCA -> HCA -> Bool # (>=) :: HCA -> HCA -> Bool # max :: HCA -> HCA -> HCA # min :: HCA -> HCA -> HCA #
Show HCA Source #
Instance details Defined in FoundationDB.Layer.Directory.Internal.HCA Methods showsPrec :: Int -> HCA -> ShowS # show :: HCA -> String # showList :: [HCA] -> ShowS #

newHCA :: Subspace -> HCA Source #

windowSize :: Int -> Int Source #

globalAllocateLock :: MVar () Source #

global lock used for allocating. We use this simply because the other clients have it. It appears to exist in order to reduce contention on the HCA counter at the transaction level by pushing some of the contention to the client level instead.

withAllocLock :: Transaction a -> Transaction a Source #

findStartAndWindow :: HCA -> Bool -> Int -> Transaction (Int, Int) Source #

findSubspaceLoop :: HCA -> Subspace -> Int -> Int -> Transaction (Maybe Subspace) Source #

initStart :: HCA -> Transaction Int Source #

allocate :: HCA -> Subspace -> Transaction Subspace Source #