org.apache.hadoop.yarn.service
Class CompositeService

java.lang.Object
  org.apache.hadoop.yarn.service.AbstractService
      org.apache.hadoop.yarn.service.CompositeService

All Implemented Interfaces:

Service

public class CompositeService
extends AbstractService

Composition of services.

Nested Class Summary

static class

CompositeService.CompositeServiceShutdownHook JVM Shutdown hook for CompositeService which will stop the give CompositeService gracefully in case of JVM shutdown.

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

Service.STATE

Constructor Summary

CompositeService(String name)

Method Summary

protected void	addService(Service service)
Collection<Service>	getServices()
void	init(org.apache.hadoop.conf.Configuration conf) Initialize the service.
protected boolean	removeService(Service service)
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

Constructor Detail

CompositeService

public CompositeService(String name)

Method Detail

getServices

public Collection<Service> getServices()

addService

protected void addService(Service service)

removeService

protected boolean removeService(Service service)

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