Package com.googlecode.objectify.util

Class FutureWrapper<K,V>

java.lang.Object

com.googlecode.objectify.util.FutureWrapper<K,V>

Type Parameters:

K - The type of this Future

V - The type of the wrapped Future

All Implemented Interfaces:

Future<V>

Direct Known Subclasses:

SimpleFutureWrapper

public abstract class FutureWrapper<K,V>
extends Object
implements Future<V>

JMS: Copied verbatum from the original GAE SDK. Probably something we can eliminate. FutureWrapper is a simple Future that wraps a parent Future. This class is thread-safe.

Constructor Summary

Constructors

Constructor	Description
FutureWrapper(Future<K> parent)

Method Summary

Modifier and Type	Method	Description
protected V	absorbParentException(Throwable cause)	Override this method if you want to suppress an exception thrown by the parent and return a value instead.
boolean	cancel(boolean mayInterruptIfRunning)
protected abstract Throwable	convertException(Throwable cause)
boolean	equals(Object obj)
V	get()
V	get(long timeout, TimeUnit unit)
int	hashCode()
boolean	isCancelled()
boolean	isDone()
protected abstract V	wrap(K key)

Methods inherited from class java.lang.Object

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

Constructor Detail

FutureWrapper

public FutureWrapper(Future<K> parent)

Method Detail

cancel

public boolean cancel(boolean mayInterruptIfRunning)

Specified by:

cancel in interface Future<K>

isCancelled

public boolean isCancelled()

Specified by:

isCancelled in interface Future<K>

isDone

public boolean isDone()

Specified by:

isDone in interface Future<K>

get

public V get()
      throws ExecutionException,
             InterruptedException

Specified by:

get in interface Future<K>

Throws:

ExecutionException

InterruptedException

get

public V get(long timeout,
             TimeUnit unit)
      throws InterruptedException,
             TimeoutException,
             ExecutionException

Specified by:

get in interface Future<K>

Throws:

InterruptedException

TimeoutException

ExecutionException

hashCode

public final int hashCode()

Overrides:

hashCode in class Object

equals

public final boolean equals(Object obj)

Overrides:

equals in class Object

wrap

protected abstract V wrap(K key)
                   throws Exception

Throws:

Exception

absorbParentException

protected V absorbParentException(Throwable cause)
                           throws Throwable

Override this method if you want to suppress an exception thrown by the parent and return a value instead.

Throws:

Throwable

convertException

protected abstract Throwable convertException(Throwable cause)