/*

 * Copyright (c) 2004, 2020 Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code 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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package sun.tools.jconsole;

import java.util.*;

public class Worker extends Thread {

    ArrayList<Runnable> jobs = new ArrayList<Runnable>();

    private volatile boolean stopped = false;

    public Worker(String name) {

        super("Worker-"+name);

        setPriority(NORM_PRIORITY - 1);

    }

    public void run() {

        while (!stopped) {

            Runnable job;

            synchronized(jobs) {

                while (!stopped && jobs.size() == 0) {

                    try {

                        jobs.wait();

                    } catch (InterruptedException ex) {

                    }

                }

                if(stopped) break;

                job = jobs.remove(0);

            }

            job.run();

        }

    }

    public void stopWorker() {

        stopped = true;

        synchronized(jobs) {

            jobs.notify();

        }

    }

    public void add(Runnable job) {

        synchronized(jobs) {

            jobs.add(job);

            jobs.notify();

        }

    }

    public boolean queueFull() {

        synchronized(jobs) {

            return (jobs.size() > 0);

        }

    }

}