Package org.apache.flink.runtime.jobmanager

Interface ExecutionPlanStoreWatcher

All Known Implementing Classes:

NoOpExecutionPlanStoreWatcher, ZooKeeperExecutionPlanStoreWatcher

public interface ExecutionPlanStoreWatcher

A watcher on ExecutionPlanStore. It could monitor all the changes on the execution plan store and notify the ExecutionPlanStore via ExecutionPlanStore.ExecutionPlanListener.

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

Method Summary

Modifier and Type	Method	Description
void	start(ExecutionPlanStore.ExecutionPlanListener executionPlanListener)	Start the watcher on ExecutionPlanStore.
void	stop()	Stop the watcher on ExecutionPlanStore.

Method Details

start

void start(ExecutionPlanStore.ExecutionPlanListener executionPlanListener)
    throws Exception

Start the watcher on ExecutionPlanStore.

Parameters:

executionPlanListener - use executionPlanListener to notify the DefaultExecutionPlanStore

Throws:

Exception - when start internal services

stop

void stop()
   throws Exception

Stop the watcher on ExecutionPlanStore.

Throws:

Exception - when stop internal services