org.apache.slider.server.services.workflow

Class ServiceTerminatingCallable<V>

java.lang.Object

org.apache.slider.server.services.workflow.ServiceTerminatingCallable<V>

All Implemented Interfaces:

Callable<V>

public class ServiceTerminatingCallable<V>
extends Object
implements Callable<V>

A runnable which terminates its owner; it also catches any exception raised and can serve it back.

Constructor Summary

Constructors

Constructor and Description
ServiceTerminatingCallable(org.apache.hadoop.service.Service owner, Callable<V> callable) Create an instance.

Method Summary

Methods

Modifier and Type	Method and Description
V	call() Delegates the call to the callable supplied in the constructor, then calls the stop() operation on its owner.
Exception	getException() Any exception raised by inner action's run.
org.apache.hadoop.service.Service	getOwner() Get the owning service

Methods inherited from class java.lang.Object

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

Constructor Detail

ServiceTerminatingCallable

public ServiceTerminatingCallable(org.apache.hadoop.service.Service owner,
                          Callable<V> callable)

Create an instance. If the owner is null, the owning service is not terminated.

Parameters:

owner - owning service -can be null

callable - callback.

Method Detail

getOwner

public org.apache.hadoop.service.Service getOwner()

Get the owning service

Returns:

the service to receive notification when the runnable completes.

getException

public Exception getException()

Any exception raised by inner action's run.

Returns:

an exception or null.

call

public V call()
       throws Exception

Delegates the call to the callable supplied in the constructor, then calls the stop() operation on its owner. Any exception is caught, noted and rethrown

Specified by:

call in interface Callable<V>

Returns:

the outcome of the delegated call operation

Throws:

Exception - if one was raised.