org.apache.slider.server.services.workflow

Class WorkflowExecutorService<E extends ExecutorService>

java.lang.Object

org.apache.hadoop.service.AbstractService

org.apache.slider.server.services.workflow.WorkflowExecutorService<E>

All Implemented Interfaces:

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

Direct Known Subclasses:

ForkedProcessService, QueueService, RoleLaunchService, WorkflowScheduledExecutorService

public class WorkflowExecutorService<E extends ExecutorService>
extends org.apache.hadoop.service.AbstractService

A service that hosts an executor -when the service is stopped, ExecutorService.shutdownNow() is invoked.

Nested Class Summary

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

org.apache.hadoop.service.Service.STATE

Constructor Summary

Constructors

Constructor and Description
WorkflowExecutorService(String name) Construct an instance with the given name -but no executor
WorkflowExecutorService(String name, E executor) Construct an instance with the given name and executor

Method Summary

Methods

Modifier and Type	Method and Description
void	execute(Runnable runnable) Execute the runnable with the executor (which must have been created already)
E	getExecutor() Get the executor
protected void	serviceStop() Stop the service: halt the executor.
void	setExecutor(E executor) Set the executor.
protected void	stopExecutor() Stop the executor if it is not null.
<V> Future<V>	submit(Callable<V> callable) Submit a callable

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, serviceInit, 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

WorkflowExecutorService

public WorkflowExecutorService(String name)

Construct an instance with the given name -but no executor

Parameters:

name - service name

WorkflowExecutorService

public WorkflowExecutorService(String name,
                       E executor)

Construct an instance with the given name and executor

Parameters:

name - service name

executor - exectuor

Method Detail

getExecutor

public E getExecutor()

Get the executor

Returns:

the executor

setExecutor

public void setExecutor(E executor)

Set the executor. Only valid if the current one is null

Parameters:

executor - executor

execute

public void execute(Runnable runnable)

Execute the runnable with the executor (which must have been created already)

Parameters:

runnable - runnable to execute

submit

public <V> Future<V> submit(Callable<V> callable)

Submit a callable

Type Parameters:

V - type of the final get

Parameters:

callable - callable

Returns:

a future to wait on

serviceStop

protected void serviceStop()
                    throws Exception

Stop the service: halt the executor.

Overrides:

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

Throws:

Exception - exception.

stopExecutor

protected void stopExecutor()

Stop the executor if it is not null. This uses ExecutorService.shutdownNow() and so does not block until they have completed.