org.apache.hadoop.yarn.event
Class AsyncDispatcher

java.lang.Object
  org.apache.hadoop.yarn.service.AbstractService
      org.apache.hadoop.yarn.event.AsyncDispatcher

All Implemented Interfaces:

Dispatcher, Service

public class AsyncDispatcher
extends AbstractService
implements Dispatcher

Dispatches events in a separate thread. Currently only single thread does that. Potentially there could be multiple channels for each event type class and a thread pool can be used to dispatch the events.

Nested Class Summary

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

Service.STATE

Field Summary

protected Map<Class<? extends Enum>,EventHandler>

eventDispatchers

Fields inherited from interface org.apache.hadoop.yarn.event.Dispatcher

DEFAULT_DISPATCHER_EXIT_ON_ERROR, DISPATCHER_EXIT_ON_ERROR_KEY

Constructor Summary

AsyncDispatcher()

AsyncDispatcher(BlockingQueue<Event> eventQueue)

Method Summary

protected void	dispatch(Event event)
EventHandler	getEventHandler()
void	init(org.apache.hadoop.conf.Configuration conf) Initialize the service.
void	register(Class<? extends Enum> eventType, EventHandler handler)
void	start() Start the service.
void	stop() Stop the service.

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

getConfig, getName, getServiceState, getStartTime, register, unregister

Methods inherited from class java.lang.Object

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

Field Detail

eventDispatchers

protected final Map<Class<? extends Enum>,EventHandler> eventDispatchers

Constructor Detail

AsyncDispatcher

public AsyncDispatcher()

AsyncDispatcher

public AsyncDispatcher(BlockingQueue<Event> eventQueue)

Method Detail

init

public void init(org.apache.hadoop.conf.Configuration conf)

Description copied from class: AbstractService

Initialize the service. The transition must be from Service.STATE.NOTINITED to Service.STATE.INITED unless the operation failed and an exception was raised.

Specified by:

init in interface Service

Overrides:

init in class AbstractService

Parameters:

conf - the configuration of the service

start

public void start()

Description copied from class: AbstractService

Start the service. The transition should be from Service.STATE.INITED to Service.STATE.STARTED unless the operation failed and an exception was raised.

Specified by:

start in interface Service

Overrides:

start in class AbstractService

stop

public void stop()

Description copied from class: AbstractService

Stop the service. This operation must be designed to complete regardless of the initial state of the service, including the state of all its internal fields.

Specified by:

stop in interface Service

Overrides:

stop in class AbstractService

dispatch

protected void dispatch(Event event)

register

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

Specified by:

register in interface Dispatcher

getEventHandler

public EventHandler getEventHandler()

Specified by:

getEventHandler in interface Dispatcher