/*
* Copyright 2012 Red Hat, Inc. and/or its affiliates.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
package org.infinispan.util.concurrent;
import java.util.concurrent.*;
import java.util.concurrent.TimeoutException;
/**
* A future that doesn't do anything and simply returns a given return value.
*
* @author Manik Surtani
* @since 5.1
*/
public class NoOpFuture<E> implements NotifyingNotifiableFuture<E> {
private final E returnValue;
public NoOpFuture(E returnValue) {
this.returnValue = returnValue;
}
@Override
public boolean cancel(boolean b) {
return false;
}
@Override
public boolean isCancelled() {
return false;
}
@Override
public boolean isDone() {
return true;
}
@Override
public E get() throws InterruptedException, ExecutionException {
return returnValue;
}
@Override
public E get(long l, TimeUnit timeUnit) throws InterruptedException, ExecutionException, TimeoutException {
return returnValue;
}
@Override
public void notifyDone() {
}
@Override
public void setNetworkFuture(Future<E> eFuture) {
throw new UnsupportedOperationException();
}
@Override
public NotifyingFuture<E> attachListener(FutureListener<E> eFutureListener) {
eFutureListener.futureDone(this);
return this;
}
}