Package org.apache.hadoop.yarn.event.multidispatcher

Class MultiDispatcher

java.lang.Object

org.apache.hadoop.service.AbstractService

org.apache.hadoop.yarn.event.multidispatcher.MultiDispatcher

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable, org.apache.hadoop.service.Service, Dispatcher

public class MultiDispatcher
extends org.apache.hadoop.service.AbstractService
implements Dispatcher

Dispatches Events in a parallel thread. The Dispatcher.getEventHandler() method can be used to post an event to the dispatcher. The posted event will be separated based on the hashcode of the Event.getLockKey(). If the getLockKey() method returns with null, then the first executor thread will be used as default worker The MultiDispatcherConfig contains the information, how many thread will be used, for parallel execution. The MultiDispatcherExecutor contains the worker threads, which handle the events. The MultiDispatcherLibrary contains the information, how to pair event types with EventHandlers The Dispatcher provides metric data using the DispatcherEventMetricsImpl.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.hadoop.service.Service

org.apache.hadoop.service.Service.STATE

Constructor Summary

Constructors

Constructor	Description
MultiDispatcher(java.lang.String dispatcherName)

Method Summary

Modifier and Type	Method	Description
EventHandler	getEventHandler()
void	register(java.lang.Class<? extends java.lang.Enum> eventType, EventHandler handler)
protected void	serviceInit(org.apache.hadoop.conf.Configuration conf)
protected void	serviceStop()

Methods inherited from class org.apache.hadoop.service.AbstractService

close, getBlockers, getConfig, getFailureCause, getFailureState, getLifecycleHistory, getName, getServiceState, getStartTime, init, isInState, noteFailure, putBlocker, registerGlobalListener, registerServiceListener, removeBlocker, serviceStart, setConfig, start, stop, toString, unregisterGlobalListener, unregisterServiceListener, waitForServiceToStop

Methods inherited from class java.lang.Object

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

Constructor Detail

MultiDispatcher

public MultiDispatcher(java.lang.String dispatcherName)

Method Detail

serviceInit

protected void serviceInit(org.apache.hadoop.conf.Configuration conf)
                    throws java.lang.Exception

Overrides:

serviceInit in class org.apache.hadoop.service.AbstractService

Throws:

java.lang.Exception

serviceStop

protected void serviceStop()
                    throws java.lang.Exception

Overrides:

serviceStop in class org.apache.hadoop.service.AbstractService

Throws:

java.lang.Exception

getEventHandler

public EventHandler getEventHandler()

Specified by:

getEventHandler in interface Dispatcher

register

public void register(java.lang.Class<? extends java.lang.Enum> eventType,
                     EventHandler handler)

Specified by:

register in interface Dispatcher