| /* |
| * 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(); |
| } |
| } |
| } |
| } |
| } |