com.google.common.util.concurrent

Class ForwardingCheckedFuture<V,X extends Exception>

java.lang.Object

com.google.common.collect.ForwardingObject

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

com.google.common.util.concurrent.ForwardingListenableFuture<V>

com.google.common.util.concurrent.ForwardingCheckedFuture<V,X>

Type Parameters:

V - The result type returned by this Future's get method

X - The type of the Exception thrown by the Future's checkedGet method

All Implemented Interfaces:

CheckedFuture<V,X>, ListenableFuture<V>, Future<V>

Direct Known Subclasses:

ForwardingCheckedFuture.SimpleForwardingCheckedFuture

@Beta
public abstract class ForwardingCheckedFuture<V,X extends Exception>
extends ForwardingListenableFuture<V>
implements CheckedFuture<V,X>

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 simply extend ForwardingCheckedFuture.SimpleForwardingCheckedFuture.

Since:

9.0

Author:

Anthony Zana

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	ForwardingCheckedFuture.SimpleForwardingCheckedFuture<V,X extends Exception> A simplified version of ForwardingCheckedFuture where subclasses can pass in an already constructed CheckedFuture as the delegate.

Nested classes/interfaces inherited from class com.google.common.util.concurrent.ForwardingListenableFuture

ForwardingListenableFuture.SimpleForwardingListenableFuture<V>

Nested classes/interfaces inherited from class com.google.common.util.concurrent.ForwardingFuture

ForwardingFuture.SimpleForwardingFuture<V>

Constructor Summary

Constructors

Constructor and Description
ForwardingCheckedFuture()

Method Summary

Methods

Modifier and Type	Method and Description
V	checkedGet() Exception checking version of Future.get() that will translate InterruptedException, CancellationException and ExecutionException into application-specific exceptions.
V	checkedGet(long timeout, TimeUnit unit) Exception checking version of Future.get(long, TimeUnit) that will translate InterruptedException, CancellationException and ExecutionException into application-specific exceptions.
protected abstract CheckedFuture<V,X>	delegate() Returns the backing delegate instance that methods are forwarded to.

Methods inherited from class com.google.common.util.concurrent.ForwardingListenableFuture

addListener

Methods inherited from class com.google.common.util.concurrent.ForwardingFuture

cancel, get, get, isCancelled, 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

Methods inherited from interface com.google.common.util.concurrent.ListenableFuture

addListener

Methods inherited from interface java.util.concurrent.Future

cancel, get, get, isCancelled, isDone

Constructor Detail

ForwardingCheckedFuture

public ForwardingCheckedFuture()

Method Detail

checkedGet

public V checkedGet()
             throws X extends Exception

Description copied from interface: CheckedFuture

Exception checking version of Future.get() that will translate InterruptedException, CancellationException and ExecutionException into application-specific exceptions.

Specified by:

checkedGet in interface CheckedFuture<V,X extends Exception>

Returns:

the result of executing the future.

Throws:

X - on interruption, cancellation or execution exceptions.

X extends Exception

checkedGet

public V checkedGet(long timeout,
           TimeUnit unit)
             throws TimeoutException,
                    X extends Exception

Description copied from interface: CheckedFuture

Exception checking version of Future.get(long, TimeUnit) that will translate InterruptedException, CancellationException and ExecutionException into application-specific exceptions. On timeout this method throws a normal TimeoutException.

Specified by:

checkedGet in interface CheckedFuture<V,X extends Exception>

Returns:

the result of executing the future.

Throws:

TimeoutException - if retrieving the result timed out.

X - on interruption, cancellation or execution exceptions.

X extends Exception

delegate

protected abstract CheckedFuture<V,X> 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 ForwardingListenableFuture<V>