/*
 * $Id$
 *
 * 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.vm.isolate;

import javax.isolate.LinkMessage;

/**
 * Base class for all types of LinkMessage implementation classes.
 *
 * @author Ewout Prangsma (epr@users.sourceforge.net)
 */
abstract class LinkMessageImpl extends LinkMessage {

    private boolean received = false;

    /**
     * Clone this message in the current isolate.
     *
     * @return
     */
    abstract LinkMessageImpl cloneMessage();

    /**
     * Block the current thread, until this message has its received flag set.
     */
    final void waitUntilReceived() throws InterruptedException {
        if (!received) {
            synchronized (this) {
                while (!received) {
                    wait();
                }
            }
        }
    }

    /**
     * Mark this message as received and notify all waiting threads.
     */
    final synchronized void notifyReceived() {
        this.received = true;
        notifyAll();
    }
}