com.google.common.util.concurrent
Class ForwardingFuture<V>

java.lang.Object
  extended by com.google.common.collect.ForwardingObject
      extended by com.google.common.util.concurrent.ForwardingFuture<V>
All Implemented Interfaces:
Future<V>
Direct Known Subclasses:
ForwardingFuture.SimpleForwardingFuture, ForwardingListenableFuture

public abstract class ForwardingFuture<V>
extends ForwardingObject
implements Future<V>

A ForwardingFuture.SimpleForwardingFuture which forwards all its method calls to another future. Subclasses should override one or more methods to modify the behavior of the backing future as desired per the decorator pattern.

Most subclasses can just use ForwardingFuture.SimpleForwardingFuture.

Since:
1.0
Author:
Sven Mawson

Nested Class Summary
static class ForwardingFuture.SimpleForwardingFuture<V>
          A simplified version of ForwardingFuture where subclasses can pass in an already constructed Future as the delegate.
 
Constructor Summary
protected ForwardingFuture()
          Constructor for use by subclasses.
 
Method Summary
 boolean cancel(boolean mayInterruptIfRunning)
           
protected abstract  Future<V> delegate()
          Returns the backing delegate instance that methods are forwarded to.
 V get()
           
 V get(long timeout, TimeUnit unit)
           
 boolean isCancelled()
           
 boolean isDone()
           
 
Methods inherited from class com.google.common.collect.ForwardingObject
toString
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Constructor Detail

ForwardingFuture

protected ForwardingFuture()
Constructor for use by subclasses.

Method Detail

delegate

protected abstract Future<V> delegate()
Description copied from class: ForwardingObject
Returns the backing delegate instance that methods are forwarded to. Abstract subclasses generally override this method with an abstract method that has a more specific return type, such as ForwardingSet.delegate(). Concrete subclasses override this method to supply the instance being decorated.

Specified by:
delegate in class ForwardingObject

cancel

public boolean cancel(boolean mayInterruptIfRunning)
Specified by:
cancel in interface Future<V>

isCancelled

public boolean isCancelled()
Specified by:
isCancelled in interface Future<V>

isDone

public boolean isDone()
Specified by:
isDone in interface Future<V>

get

public V get()
      throws InterruptedException,
             ExecutionException
Specified by:
get in interface Future<V>
Throws:
InterruptedException
ExecutionException

get

public V get(long timeout,
             TimeUnit unit)
      throws InterruptedException,
             ExecutionException,
             TimeoutException
Specified by:
get in interface Future<V>
Throws:
InterruptedException
ExecutionException
TimeoutException


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