git-annex/Logs/NumCopies.hs
Joey Hess 3c15e0f7a0
cache negative lookups of global numcopies and mincopies
Speeds up eg git-annex sync --content by up to 50%. When it does not need
to transfer or drop anything, it now noops a lot more quickly.

I didn't see anything else in sync --content noop loop that could really
be sped up. It has to cat git objects to keys, stat object files, etc.

Sponsored-by: unqueued on Patreon
2023-06-06 14:43:25 -04:00

66 lines
1.9 KiB
Haskell

{- git-annex numcopies log
-
- Copyright 2014-2021 Joey Hess <id@joeyh.name>
-
- Licensed under the GNU AGPL version 3 or higher.
-}
{-# OPTIONS_GHC -fno-warn-orphans #-}
module Logs.NumCopies (
setGlobalNumCopies,
setGlobalMinCopies,
getGlobalNumCopies,
getGlobalMinCopies,
globalNumCopiesLoad,
globalMinCopiesLoad,
) where
import Annex.Common
import qualified Annex
import qualified Annex.Branch
import Types.NumCopies
import Logs
import Logs.SingleValue
instance SingleValueSerializable NumCopies where
serialize = encodeBS . show . fromNumCopies
deserialize = configuredNumCopies <$$> readish . decodeBS
instance SingleValueSerializable MinCopies where
serialize = encodeBS . show . fromMinCopies
deserialize = configuredMinCopies <$$> readish . decodeBS
setGlobalNumCopies :: NumCopies -> Annex ()
setGlobalNumCopies new = do
curr <- getGlobalNumCopies
when (curr /= Just new) $
setLog (Annex.Branch.RegardingUUID []) numcopiesLog new
setGlobalMinCopies :: MinCopies -> Annex ()
setGlobalMinCopies new = do
curr <- getGlobalMinCopies
when (curr /= Just new) $
setLog (Annex.Branch.RegardingUUID []) mincopiesLog new
{- Value configured in the numcopies log. Cached for speed. -}
getGlobalNumCopies :: Annex (Maybe NumCopies)
getGlobalNumCopies = maybe globalNumCopiesLoad return
=<< Annex.getState Annex.globalnumcopies
{- Value configured in the mincopies log. Cached for speed. -}
getGlobalMinCopies :: Annex (Maybe MinCopies)
getGlobalMinCopies = maybe globalMinCopiesLoad return
=<< Annex.getState Annex.globalmincopies
globalNumCopiesLoad :: Annex (Maybe NumCopies)
globalNumCopiesLoad = do
v <- getLog numcopiesLog
Annex.changeState $ \s -> s { Annex.globalnumcopies = Just v }
return v
globalMinCopiesLoad :: Annex (Maybe MinCopies)
globalMinCopiesLoad = do
v <- getLog mincopiesLog
Annex.changeState $ \s -> s { Annex.globalmincopies = Just v }
return v