/*
* Mojito Distributed Hash Table (Mojito DHT)
* Copyright (C) 2006-2007 LimeWire LLC
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
package org.limewire.mojito.concurrent;
import java.util.concurrent.CancellationException;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import org.limewire.concurrent.OnewayExchanger;
/**
* A FixedDHTFuture is hard coded to return a value or
* to throw an Exception.
*/
public class FixedDHTFuture<T> implements DHTFuture<T> {
private final OnewayExchanger<T, ExecutionException> exchanger
= new OnewayExchanger<T, ExecutionException>(true);
public FixedDHTFuture(T value) {
exchanger.setValue(value);
}
public FixedDHTFuture(Exception exception) {
exchanger.setException(new ExecutionException(exception));
}
public void addDHTFutureListener(DHTFutureListener<T> listener) {
if (listener == null) {
throw new NullPointerException("DHTFutureListener is null");
}
try {
T value = get();
listener.handleFutureSuccess(value);
} catch (ExecutionException e) {
listener.handleExecutionException(e);
} catch (CancellationException e) {
listener.handleCancellationException(e);
} catch (InterruptedException e) {
listener.handleInterruptedException(e);
}
}
public boolean cancel(boolean mayInterruptIfRunning) {
return exchanger.cancel();
}
public T get() throws InterruptedException, ExecutionException {
return exchanger.get();
}
public T get(long timeout, TimeUnit unit)
throws InterruptedException, ExecutionException, TimeoutException {
return exchanger.get(timeout, unit);
}
public boolean isCancelled() {
return exchanger.isCancelled();
}
public boolean isDone() {
return exchanger.isDone();
}
}