1 /*
   2  * Copyright (c) 2003, 2015, 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  * @modules java.management
  31  */
  32 
  33 import java.lang.management.ThreadMXBean;
  34 import java.lang.management.ManagementFactory;
  35 
  36 public class DisableTest {
  37     private static ThreadMXBean tm = ManagementFactory.getThreadMXBean();
  38 
  39     public static void main(String args[]) throws Exception {
  40         try {
  41             testThreadContentionMonitoring();
  42             testThreadCpuMonitoring();
  43         } finally {
  44             // restore the default
  45             if (tm.isThreadContentionMonitoringSupported()) {
  46                 tm.setThreadContentionMonitoringEnabled(false);
  47             }
  48             if (tm.isThreadCpuTimeSupported()) {
  49                 tm.setThreadCpuTimeEnabled(false);
  50             }
  51         }
  52 
  53         System.out.println("Test passed.");
  54     }
  55 
  56     private static void testThreadContentionMonitoring()
  57         throws Exception {
  58         if (!tm.isThreadContentionMonitoringSupported()) {
  59             System.out.println("JVM does not supports thread contention monitoring");
  60             return;
  61         }
  62 
  63         // Default is false.
  64         tm.setThreadContentionMonitoringEnabled(false);
  65         tm.setThreadContentionMonitoringEnabled(false);
  66 
  67         // check if disabled
  68         if (tm.isThreadContentionMonitoringEnabled()) {
  69             throw new RuntimeException("TEST FAILED: " +
  70                 "Expected thread contention monitoring to be disabled");
  71         }
  72 
  73         tm.setThreadContentionMonitoringEnabled(true);
  74         // check if enabled
  75         if (!tm.isThreadContentionMonitoringEnabled()) {
  76             throw new RuntimeException("TEST FAILED: " +
  77                 "Expected thread contention monitoring to be enabled");
  78         }
  79     }
  80 
  81     private static void testThreadCpuMonitoring()
  82         throws Exception {
  83         if (!tm.isThreadCpuTimeSupported()) {
  84             System.out.println("JVM does not support thread CPU time monitoring");
  85             return;
  86         }
  87 
  88         if (tm.isThreadCpuTimeEnabled()) {
  89             tm.setThreadCpuTimeEnabled(false);
  90         }
  91 
  92         // check if disabled
  93         if (tm.isThreadCpuTimeEnabled()) {
  94             throw new RuntimeException("TEST FAILED: " +
  95                 "Expected thread CPU time monitoring to be disabled");
  96         }
  97 
  98         tm.setThreadCpuTimeEnabled(false);
  99         tm.setThreadCpuTimeEnabled(false);
 100 
 101         if (tm.isThreadCpuTimeEnabled()) {
 102             throw new RuntimeException("TEST FAILED: " +
 103                 "Expected thread CPU time monitoring to be disabled");
 104         }
 105 
 106         tm.setThreadCpuTimeEnabled(true);
 107         if (!tm.isThreadCpuTimeEnabled()) {
 108             throw new RuntimeException("TEST FAILED: " +
 109                 "Expected thread CPU time monitoring to be disabled");
 110         }
 111     }
 112 
 113 }