Utils.java revision 1255:2aeaffb6c897 
1/*
2 * Copyright 2003-2006 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 * Utility class for ThreadMXBean tests
26 */
27import java.lang.management.ManagementFactory;
28import java.lang.management.ThreadMXBean;
29
30public class Utils {
31    private static final ThreadMXBean tm = ManagementFactory.getThreadMXBean();
32    private static final int MAX_RETRY = 200;
33
34    public static boolean waitForBlockWaitingState(Thread t) {
35        // wait for the thread to transition to the expected state
36        int retryCount=0;
37        while (t.getState() == Thread.State.RUNNABLE && retryCount < MAX_RETRY) {
38            goSleep(100);
39            retryCount++;
40        }
41        return (t.getState() != Thread.State.RUNNABLE);
42    }
43
44    public static boolean waitForThreadState(Thread t, Thread.State expected) {
45        // wait for the thread to transition to the expected state
46        int retryCount=0;
47        while (t.getState() != expected && retryCount < MAX_RETRY) {
48            goSleep(100);
49            retryCount++;
50        }
51        return (t.getState() == expected);
52    }
53
54    public static void checkThreadState(Thread t, Thread.State expected) {
55        waitForThreadState(t, expected);
56
57        Thread.State state = tm.getThreadInfo(t.getId()).getThreadState();
58        if (state == null) {
59            throw new RuntimeException(t.getName() + " expected to have " +
60                expected + " but got null.");
61        }
62        if (state != expected) {
63            t.dumpStack();
64            throw new RuntimeException(t.getName() +
65                 " expected to have " + expected + " but got " + state);
66        }
67    }
68
69    public static void goSleep(long ms) {
70        try {
71            Thread.sleep(ms);
72        } catch (InterruptedException e) {
73            e.printStackTrace();
74            System.out.println("TEST FAILED: Unexpected exception.");
75            throw new RuntimeException(e);
76        }
77    }
78
79}
80