1 /*
   2  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 /*
  25  * @test
  26  * @bug     4956978
  27  * @summary The capability is disabled regardless of number of times
  28  *          it was enabled.
  29  * @author  Mandy Chung
  30  */
  31 
  32 import java.lang.management.ThreadMXBean;
  33 import java.lang.management.ManagementFactory;
  34 
  35 public class DisableTest {
  36     private static ThreadMXBean tm = ManagementFactory.getThreadMXBean();
  37 
  38     public static void main(String args[]) throws Exception {
  39         try {
  40             testThreadContentionMonitoring();
  41             testThreadCpuMonitoring();
  42         } finally {
  43             // restore the default
  44             if (tm.isThreadContentionMonitoringSupported()) {
  45                 tm.setThreadContentionMonitoringEnabled(false);
  46             }
  47             if (tm.isThreadCpuTimeSupported()) {
  48                 tm.setThreadCpuTimeEnabled(false);
  49             }
  50         }
  51 
  52         System.out.println("Test passed.");
  53     }
  54 
  55     private static void testThreadContentionMonitoring()
  56         throws Exception {
  57         if (!tm.isThreadContentionMonitoringSupported()) {
  58             System.out.println("JVM does not supports thread contention monitoring");
  59             return;
  60         }
  61 
  62         // Default is false.
  63         tm.setThreadContentionMonitoringEnabled(false);
  64         tm.setThreadContentionMonitoringEnabled(false);
  65 
  66         // check if disabled
  67         if (tm.isThreadContentionMonitoringEnabled()) {
  68             throw new RuntimeException("TEST FAILED: " +
  69                 "Expected thread contention monitoring to be disabled");
  70         }
  71 
  72         tm.setThreadContentionMonitoringEnabled(true);
  73         // check if enabled
  74         if (!tm.isThreadContentionMonitoringEnabled()) {
  75             throw new RuntimeException("TEST FAILED: " +
  76                 "Expected thread contention monitoring to be enabled");
  77         }
  78     }
  79 
  80     private static void testThreadCpuMonitoring()
  81         throws Exception {
  82         if (!tm.isThreadCpuTimeSupported()) {
  83             System.out.println("JVM does not support thread CPU time monitoring");
  84             return;
  85         }
  86 
  87         if (tm.isThreadCpuTimeEnabled()) {
  88             tm.setThreadCpuTimeEnabled(false);
  89         }
  90 
  91         // check if disabled
  92         if (tm.isThreadCpuTimeEnabled()) {
  93             throw new RuntimeException("TEST FAILED: " +
  94                 "Expected thread CPU time monitoring to be disabled");
  95         }
  96 
  97         tm.setThreadCpuTimeEnabled(false);
  98         tm.setThreadCpuTimeEnabled(false);
  99 
 100         if (tm.isThreadCpuTimeEnabled()) {
 101             throw new RuntimeException("TEST FAILED: " +
 102                 "Expected thread CPU time monitoring to be disabled");
 103         }
 104 
 105         tm.setThreadCpuTimeEnabled(true);
 106         if (!tm.isThreadCpuTimeEnabled()) {
 107             throw new RuntimeException("TEST FAILED: " +
 108                 "Expected thread CPU time monitoring to be disabled");
 109         }
 110     }
 111 
 112 }