Package nl.talsmasoftware.context.delegation

Class DelegatingFuture<V>

java.lang.Object

nl.talsmasoftware.context.delegation.Wrapper<Future<V>>

nl.talsmasoftware.context.delegation.DelegatingFuture<V>

All Implemented Interfaces:

Future<V>

public abstract class DelegatingFuture<V>
extends Wrapper<Future<V>>
implements Future<V>

Abstract baseclass that simplifies wrapping an existing Future by forwarding all required methods to a delegate future object.
The class also provides overridable wrapper methods for result and exception outcomes.

Although this class does implement all required methods of Future it is still declared as an abstract class.
This is because it does not provide any value in itself.

Author:

Sjoerd Talsma

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	DelegatingFuture(Future<V> delegate)

Method Summary

Modifier and Type	Method	Description
boolean	cancel(boolean mayInterruptIfRunning)
V	get()
V	get(long timeout, TimeUnit unit)
boolean	isCancelled()
boolean	isDone()
protected ExecutionException	wrapException(ExecutionException exception)	Overridable method to wrap the ExecutionException after it has been thrown from the delegate future.
protected V	wrapResult(V result)	Overridable method to wrap the result after it has been obtained from the delegate future.

Methods inherited from class nl.talsmasoftware.context.delegation.Wrapper

delegate, equals, hashCode, nonNullDelegate, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

DelegatingFuture

protected DelegatingFuture(Future<V> delegate)

Method Detail

wrapResult

protected V wrapResult(V result)

Overridable method to wrap the result after it has been obtained from the delegate future.

Parameters:

result - The original result from the delegate.

Returns:

The wrapped result.

wrapException

protected ExecutionException wrapException(ExecutionException exception)

Overridable method to wrap the ExecutionException after it has been thrown from the delegate future.

Parameters:

exception - The original execution exception from the delegate.

Returns:

The wrapped exception.

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