package ch.usi.da.paxos.storage;
/*
* Copyright (c) 2013 Università della Svizzera italiana (USI)
*
* This file is part of URingPaxos.
*
* URingPaxos 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 3 of the License, or
* (at your option) any later version.
*
* URingPaxos 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 URingPaxos. If not, see <http://www.gnu.org/licenses/>.
*/
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
/**
* Name: FutureDecision<br>
* Description: <br>
*
* See Java Concurrency in Practice p. 187
*
* Creation date: Mar 20, 2013<br>
* $Id$
*
* @author Samuel Benz benz@geoid.ch
*/
public class FutureDecision {
private Decision decision = null;
private final CountDownLatch done = new CountDownLatch(1);
public FutureDecision(){
}
public boolean isDecided(){
return (done.getCount() == 0);
}
public synchronized void setDecision(Decision decision){
if(!isDecided()){
this.decision = decision;
done.countDown();
}
}
public Decision getDecision() throws InterruptedException {
done.await();
synchronized (this) {
return decision;
}
}
public Decision getDecision(int timeout) throws InterruptedException {
done.await(timeout,TimeUnit.MILLISECONDS);
synchronized (this) {
return decision;
}
}
}