ForwardingFuture

com.google.common.util.concurrent

Class ForwardingFuture<V>

java.lang.Object
- com.google.common.collect.ForwardingObject
- - 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 Future 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

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
`static class`	`ForwardingFuture.SimpleForwardingFuture<V>` A simplified version of `ForwardingFuture` where subclasses can pass in an already constructed `Future` as the delegate.

Constructor Summary

Constructors

Modifier	Constructor and Description
`protected`	`ForwardingFuture()` Constructor for use by subclasses.

Method Summary

All Methods

Instance Methods

Abstract Methods

Concrete Methods
Modifier and Type	Method and Description
`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.
  - cancel
```
public boolean cancel(boolean mayInterruptIfRunning)
```
  - isCancelled
```
public boolean isCancelled()
```
  - isDone
```
public boolean isDone()
```
  - 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