0
|
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 }
|