/*
* $Id$
*
* Copyright (C) 2003-2015 JNode.org
*
* This library 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 library 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.jnode.util;
/**
* @author epr
*/
public abstract class Command {
/**
* Is this command finished yet?
*/
private boolean finished = false;
/**
* Has this command finished?
*
* @return boolean
*/
public final boolean isFinished() {
return finished;
}
/**
* Mark this command as finished.
* Notify all waiting threads.
*/
protected final synchronized void notifyFinished() {
finished = true;
notifyAll();
}
/**
* Block the current thread, until this command has finished.
*
* @param timeout
* @throws InterruptedException This thread was interrupted
* @throws TimeoutException A timeout occurred.
*/
public synchronized void waitUntilFinished(long timeout)
throws InterruptedException, TimeoutException {
final long start = System.currentTimeMillis();
while (!finished) {
wait(timeout);
if ((timeout > 0) && (!finished)) {
if (System.currentTimeMillis() >= start + timeout) {
throw new TimeoutException("timeout");
}
}
}
}
}