/*
* Copyright (c) 2000, 2001, 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.
*
* 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.jvm.hotspot.utilities;
/** This class abstracts the notion of a worker thread which is fed
tasks in the form of Runnables. */
public class WorkerThread {
private volatile boolean done = false;
private MessageQueueBackend mqb;
private MessageQueue mq;
public WorkerThread() {
mqb = new MessageQueueBackend();
mq = mqb.getFirstQueue();
new Thread(new MainLoop()).start();
}
/** Runs the given Runnable in the thread represented by this
WorkerThread object at an unspecified later time. */
public void invokeLater(Runnable runnable) {
mq.writeMessage(runnable);
}
/** Can be used to dispose of the internal worker thread. Note that
this method may return before the internal worker thread
terminates. */
public void shutdown() {
done = true;
mq.writeMessage(new Runnable() { public void run() {} });
}
class MainLoop implements Runnable {
private MessageQueue myMq;
public MainLoop() {
myMq = mqb.getSecondQueue();
}
public void run() {
while (!done) {
Runnable runnable = (Runnable) myMq.readMessage();
try {
runnable.run();
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
}