01: /*
02: * Copyright 2004 Sun Microsystems, Inc. All Rights Reserved.
03: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
04: *
05: * This code is free software; you can redistribute it and/or modify it
06: * under the terms of the GNU General Public License version 2 only, as
07: * published by the Free Software Foundation. Sun designates this
08: * particular file as subject to the "Classpath" exception as provided
09: * by Sun in the LICENSE file that accompanied this code.
10: *
11: * This code is distributed in the hope that it will be useful, but WITHOUT
12: * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13: * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14: * version 2 for more details (a copy is included in the LICENSE file that
15: * accompanied this code).
16: *
17: * You should have received a copy of the GNU General Public License version
18: * 2 along with this work; if not, write to the Free Software Foundation,
19: * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20: *
21: * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22: * CA 95054 USA or visit www.sun.com if you need additional information or
23: * have any questions.
24: */
25:
26: package sun.tools.jconsole;
27:
28: import java.util.*;
29:
30: public class Worker extends Thread {
31: ArrayList<Runnable> jobs = new ArrayList<Runnable>();
32: private boolean stopped = false;
33:
34: public Worker(String name) {
35: super ("Worker-" + name);
36:
37: setPriority(NORM_PRIORITY - 1);
38: }
39:
40: public void run() {
41: while (!isStopped()) {
42: Runnable job;
43: synchronized (jobs) {
44: while (!isStopped() && jobs.size() == 0) {
45: try {
46: jobs.wait();
47: } catch (InterruptedException ex) {
48: }
49: }
50:
51: if (isStopped())
52: break;
53:
54: job = jobs.remove(0);
55: }
56: job.run();
57: }
58: }
59:
60: private synchronized boolean isStopped() {
61: return stopped;
62: }
63:
64: public synchronized void stopWorker() {
65: stopped = true;
66: synchronized (jobs) {
67: jobs.notify();
68: }
69: }
70:
71: public void add(Runnable job) {
72: synchronized (jobs) {
73: jobs.add(job);
74: jobs.notify();
75: }
76: }
77:
78: public boolean queueFull() {
79: synchronized (jobs) {
80: return (jobs.size() > 0);
81: }
82: }
83: }
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