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comparison agent/src/share/classes/sun/jvm/hotspot/utilities/WorkerThread.java @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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children c18cbe5936b8
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 2000-2001 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 package sun.jvm.hotspot.utilities;
26
27 /** This class abstracts the notion of a worker thread which is fed
28 tasks in the form of Runnables. */
29
30 public class WorkerThread {
31 private volatile boolean done = false;
32 private MessageQueueBackend mqb;
33 private MessageQueue mq;
34
35 public WorkerThread() {
36 mqb = new MessageQueueBackend();
37 mq = mqb.getFirstQueue();
38 new Thread(new MainLoop()).start();
39 }
40
41 /** Runs the given Runnable in the thread represented by this
42 WorkerThread object at an unspecified later time. */
43 public void invokeLater(Runnable runnable) {
44 mq.writeMessage(runnable);
45 }
46
47 /** Can be used to dispose of the internal worker thread. Note that
48 this method may return before the internal worker thread
49 terminates. */
50 public void shutdown() {
51 done = true;
52 mq.writeMessage(new Runnable() { public void run() {} });
53 }
54
55 class MainLoop implements Runnable {
56 private MessageQueue myMq;
57
58 public MainLoop() {
59 myMq = mqb.getSecondQueue();
60 }
61
62 public void run() {
63 while (!done) {
64 Runnable runnable = (Runnable) myMq.readMessage();
65 try {
66 runnable.run();
67 } catch (Exception e) {
68 e.printStackTrace();
69 }
70 }
71 }
72 }
73 }