org.apache.flink.runtime.jobmanager

Interface JobGraphStoreWatcher

All Known Implementing Classes:

NoOpJobGraphStoreWatcher, ZooKeeperJobGraphStoreWatcher

public interface JobGraphStoreWatcher

A watcher on JobGraphStore. It could monitor all the changes on the job graph store and notify the JobGraphStore via JobGraphStore.JobGraphListener.

Important: The JobGraphStoreWatcher could not guarantee that there is no JobGraphStore.JobGraphListener callbacks happen after stop(). So the implementor is responsible for filtering out these spurious callbacks.

Method Summary

Modifier and Type	Method and Description
void	start(JobGraphStore.JobGraphListener jobGraphListener) Start the watcher on JobGraphStore.
void	stop() Stop the watcher on JobGraphStore.

Method Detail

start

void start(JobGraphStore.JobGraphListener jobGraphListener)
    throws Exception

Start the watcher on JobGraphStore.

Parameters:

jobGraphListener - use jobGraphListener to notify the DefaultJobGraphStore

Throws:

Exception - when start internal services

stop

void stop()
   throws Exception

Stop the watcher on JobGraphStore.

Throws:

Exception - when stop internal services