Îõ³h$­².      !"#$%&'()*+,-None 89>ÀÆÙàì†persistent-stm&A strategy for persisting values from " to some persistent storage. The  é implementation is provided as a quick way to get started, but note the weaknesses in its documentation.A ƒ can read one value at a time, but should be able to atomically write/delete an entire set of keys at once, preferably atomically.persistent-stmøRead a single value from persistent storage. Return the serialized representation if it exists, and Nothing otherwise.persistent-stm Write (for . values) or delete (for /÷ values) an entire set of values to persistent storage. The values should ideally be written atomically, and if they are not then the implementation will be vulnerable to inconsistent data and corruption if the process is suddenly terminated.persistent-stm-Perform any cleanup that is needed after the < is closed. This can include releasing locks, for example.persistent-stmçA type class for things that can be stored in a DBRef. This is similar to a serialization class like 0, but reads have access to the  and the STM monad, which is important because it allows for one < to be stored inside the value of another. (In this case,  will call .) persistent-stm A simple  that stores data in a directory in the local filesystem. This is an easy way to get started. However, note that because writes are not atomic, your data can be corrupted during a crash or power outage. For this reason, it's recommended that you use a different  for most applications. persistent-stmOpens a  using the given %. The caller should guarantee that   is called when the  is no longer needed. persistent-stm Closes a ‚. When this call returns, all data will be written to persistent storage, and the program can exit without possibly losing data. persistent-stmRuns an action with a  open. The 3 will be closed when the action is finished. The 9 value should not be used after the action has returned.persistent-stm½Check that there are at most the given number of queued writes to the database, and retries the transaction if so. Adding this to the beginning of your transactions can help prevent writes from falling too far behind the live data. Prioritizing writes this way can also reduce memory usage, because unreachable ?s no longer need to be retained once they are written to disk.persistent-stm1Atomically performs an STM transaction just like 1À, but also waits for any changes it might have observed in the ¨ to be written to persistent storage before returning. This guarantees that a transaction whose results were observed will not be rolled back if the program crashes.persistent-stm Retrieves a  from a 1 for the given key. Throws an exception if the ™ requested has a different type from a previous time the key was used in this process, or if a serialized value in persistent storage cannot be parsed.persistent-stmGets the value stored in a . The value is . x if x; was last value stored in the database using this key, or /. if there is no value stored in the database.persistent-stmUpdates the value stored in a È. The update will be persisted to storage soon, but not synchronously.persistent-stmDeletes the value stored in a È. The delete will be persisted to storage soon, but not synchronously.,persistent-stmOnly s in the same  should be compared.-persistent-stmOnly s in the same  should be compared.     2      !"#$%&'()*+,-./01/02345/678-persistent-stm-0.1.0.0-86nZsDcTBn7GH92f5IYipB PersistentSTMDBRefDB PersistencepersistentReadpersistentWritepersistentFinish DBStorabledecodeencodefilePersistenceopenDBcloseDBwithDBwaitForMaxBacklog synchronouslygetDBRef readDBRef writeDBRef deleteDBRef$fDBStorable[]$fDBStorableShortByteString$fDBStorableByteString$fDBStorableByteString0$fDBStorableWord64$fDBStorableWord32$fDBStorableWord16$fDBStorableWord8$fDBStorableWord$fDBStorableOrdering$fDBStorableNatural$fDBStorableInteger$fDBStorableInt64$fDBStorableInt32$fDBStorableInt16$fDBStorableInt8$fDBStorableInt$fDBStorableFloat$fDBStorableDouble$fDBStorableChar$fDBStorableBool$fDBStorable()$fDBStorableDBRef $fShowDBRef $fOrdDBRef $fEqDBRefbase GHC.MaybeJustNothingbinary-0.8.8.0Data.Binary.ClassBinary GHC.Conc.Sync atomically