/*
 * $Id$
 *
 * 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 class Token {

    private boolean locked;

    /**
     * Create a new instance
     */
    public Token() {
        this.locked = false;
    }

    /**
     * Claim ownership of this token
     *
     * @param owner
     * @param timeout
     * @throws InterruptedException
     * @throws TimeoutException
     */
    public synchronized void claim(Object owner, long timeout)
        throws InterruptedException, TimeoutException {
        final long start = System.currentTimeMillis();
        while (locked) {
            wait(timeout);
            if (locked) {
                if (System.currentTimeMillis() > start + timeout) {
                    throw new TimeoutException();
                }
            }
        }
        this.locked = true;
    }

    /**
     * Release ownership of this token
     */
    public synchronized void release() {
        this.locked = false;
        notifyAll();
    }
}