Persistence

This module abstracts over the details of persisting the value. Journaling is also handled here, if enabled.

Documentation

data PersistentValue

data PersistenceConfig

Constructors

PersistenceConfig

Fields

• pcDataFile :: FilePath
• pcJournalFile :: Maybe FilePath
• pcLogger :: Logger
• pcMetrics :: Maybe IcepeakMetrics

getDataFile :: StorageBackend -> Maybe FilePath -> FilePath

getValue :: PersistentValue -> STM Value

Get the actual value

apply :: Modification -> PersistentValue -> IO ()

Apply a modification, and write it to the journal if enabled.

loadFromBackend :: StorageBackend -> PersistenceConfig -> IO (Either String PersistentValue)

setupStorageBackend :: StorageBackend -> FilePath -> IO ()

Ensure that we can access the chosen storage file, and validate that it has the right file format

syncToBackend :: StorageBackend -> PersistentValue -> IO ()