org.apache.slider.server.services.workflow

Class WorkflowCompositeService

java.lang.Object

org.apache.hadoop.service.AbstractService

org.apache.hadoop.service.CompositeService

org.apache.slider.server.services.workflow.WorkflowCompositeService

All Implemented Interfaces:

Closeable, AutoCloseable, org.apache.hadoop.service.Service, org.apache.hadoop.service.ServiceStateChangeListener, ServiceParent

Direct Known Subclasses:

LaunchedWorkflowCompositeService

public class WorkflowCompositeService
extends org.apache.hadoop.service.CompositeService
implements ServiceParent, org.apache.hadoop.service.ServiceStateChangeListener

An extended composite service which stops itself if any child service fails, or when all its children have successfully stopped without failure. Lifecycle

1. If any child exits with a failure: this service stops, propagating the exception.
2. When all child services has stopped, this service stops itself

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.hadoop.service.CompositeService

org.apache.hadoop.service.CompositeService.CompositeServiceShutdownHook

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

org.apache.hadoop.service.Service.STATE

Field Summary

Fields inherited from class org.apache.hadoop.service.CompositeService

STOP_ONLY_STARTED_SERVICES

Constructor Summary

Constructors

Constructor and Description
WorkflowCompositeService() Construct an instance with the default name.
WorkflowCompositeService(String name) Construct an instance
WorkflowCompositeService(String name, List<org.apache.hadoop.service.Service> children) Construct with a list of children
WorkflowCompositeService(String name, org.apache.hadoop.service.Service... children) Varargs constructor

Method Summary

Methods

Modifier and Type	Method and Description
void	addService(org.apache.hadoop.service.Service service) Add a service, and register it
void	stateChanged(org.apache.hadoop.service.Service child) When this service is started, any service stopping with a failure exception is converted immediately into a failure of this service, storing the failure and stopping ourselves.

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

addIfService, getServices, removeService, serviceInit, serviceStart, 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, setConfig, start, stop, toString, unregisterGlobalListener, unregisterServiceListener, waitForServiceToStop

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.slider.server.services.workflow.ServiceParent

getServices

Methods inherited from interface org.apache.hadoop.service.Service

close, getBlockers, getConfig, getFailureCause, getFailureState, getLifecycleHistory, getName, getServiceState, getStartTime, init, isInState, registerServiceListener, start, stop, unregisterServiceListener, waitForServiceToStop

Constructor Detail

WorkflowCompositeService

public WorkflowCompositeService(String name)

Construct an instance

Parameters:

name - name of this service instance

WorkflowCompositeService

public WorkflowCompositeService()

Construct an instance with the default name.

WorkflowCompositeService

public WorkflowCompositeService(String name,
                        org.apache.hadoop.service.Service... children)

Varargs constructor

Parameters:

name - name of this service instance

children - children

WorkflowCompositeService

public WorkflowCompositeService(String name,
                        List<org.apache.hadoop.service.Service> children)

Construct with a list of children

Parameters:

name - name of this service instance

children - children to add

Method Detail

addService

public void addService(org.apache.hadoop.service.Service service)

Add a service, and register it

Specified by:

addService in interface ServiceParent

Overrides:

addService in class org.apache.hadoop.service.CompositeService

Parameters:

service - the Service to be added. Important: do not add a service to a parent during your own serviceInit/start, in Hadoop 2.2; you will trigger a ConcurrentModificationException.

stateChanged

public void stateChanged(org.apache.hadoop.service.Service child)

When this service is started, any service stopping with a failure exception is converted immediately into a failure of this service, storing the failure and stopping ourselves.

Specified by:

stateChanged in interface org.apache.hadoop.service.ServiceStateChangeListener

Parameters:

child - the service that has changed.