org.apache.hadoop.hbase.executor

Class ExecutorService

java.lang.Object

org.apache.hadoop.hbase.executor.ExecutorService

@InterfaceAudience.Private
public class ExecutorService
extends Object

This is a generic executor service. This component abstracts a threadpool, a queue to which EventTypes can be submitted, and a Runnable that handles the object that is added to the queue.

In order to create a new service, create an instance of this class and then do: instance.startExecutorService("myService");. When done call shutdown().

In order to use the service created above, call submit(EventHandler). Register pre- and post- processing listeners by registering your implementation of EventHandler.EventHandlerListener with registerListener(EventType, EventHandler.EventHandlerListener). Be sure to deregister your listener when done via unregisterListener(EventType).

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	ExecutorService.ExecutorStatus A snapshot of the status of a particular executor.
static class	ExecutorService.RunningEventStatus The status of a particular event that is in the middle of being handled by an executor.

Constructor Summary

Constructors

Constructor and Description
ExecutorService(String servername) Default constructor.

Method Summary

Methods

Modifier and Type	Method and Description
Map<String,ExecutorService.ExecutorStatus>	getAllExecutorStatuses()
void	registerListener(EventType type, EventHandler.EventHandlerListener listener) Subscribe to updates before and after processing instances of EventType.
void	shutdown()
void	startExecutorService(ExecutorType type, int maxThreads)
void	submit(EventHandler eh)
EventHandler.EventHandlerListener	unregisterListener(EventType type) Stop receiving updates before and after processing instances of EventType

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ExecutorService

public ExecutorService(String servername)

Default constructor.

Parameters:

servername - Name of the hosting server.

Method Detail

shutdown

public void shutdown()

startExecutorService

public void startExecutorService(ExecutorType type,
                        int maxThreads)

submit

public void submit(EventHandler eh)

registerListener

public void registerListener(EventType type,
                    EventHandler.EventHandlerListener listener)

Subscribe to updates before and after processing instances of EventType. Currently only one listener per event type.

Parameters:

type - Type of event we're registering listener for

listener - The listener to run.

unregisterListener

public EventHandler.EventHandlerListener unregisterListener(EventType type)

Stop receiving updates before and after processing instances of EventType

Parameters:

type - Type of event we're registering listener for

Returns:

The listener we removed or null if we did not remove it.

getAllExecutorStatuses

public Map<String,ExecutorService.ExecutorStatus> getAllExecutorStatuses()