Safe Haskell	None
Language	Haskell2010

ZooKeeper.Recipe

Synopsis

Documentation

Arguments

:: ZHandle	The zookeeper handle obtained by a call to `zookeeperResInit`
-> CBytes	The path to start the election from. Ephemeral znodes will be put on it
-> CBytes	The GUID for this zookeeper session. To handle recoverable execptions correctly, it should be distinct from different sessions.
-> IO ()	The action to be executed when an leader is elected.
-> (DataCompletion -> IO ())	The action to be executed when a watcher is set. It can be used to remind the user that one `step` is finished.
-> IO ()

Run a leader election process. IMPORTANT: This function may run endlessly until it is selected as the leader.

Arguments

:: ZHandle	The zookeeper handle obtained by a call to `zookeeperResInit`
-> CBytes	The path to get the lock. Ephemeral znodes will be put on it
-> CBytes	The GUID for this zookeeper session. To handle recoverable execptions correctly, it should be distinct from different sessions
-> IO CBytes	The real path of the lock that acquired. It will be used when unlocking the same lock

To acquire a distributed lock.

Arguments

:: ZHandle	The zookeeper handle obtained by a call to `zookeeperResInit`
-> CBytes	The real lock path acquired by `lock`. An exception will be thrown if it is bad (for example, does not exist)
-> IO ()

To release a distributed lock. Note that the real lock path should be the one acquired by lock, otherwise, a ZooException will be thrown.