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/*
* Copyright (c) 2003, 2015, 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.
*/
/*
* @test
* @bug 4530538
* @summary Basic unit test of
* ThreadMXBean.setThreadContentionMonitoringEnabled()
* and ThreadMXBean.setThreadCpuTimeEnabled().
* @author Mandy Chung
*
* @run main EnableTest
*/
import java.lang.management.*;
public class EnableTest {
private static ThreadMXBean tm = ManagementFactory.getThreadMXBean();
private static void checkThreadContentionMonitoring(boolean expectedValue)
throws Exception {
boolean value = tm.isThreadContentionMonitoringEnabled();
if (value != expectedValue) {
throw new RuntimeException("TEST FAILED: " +
"isThreadContentionMonitoringEnabled() returns " + value +
" but expected to be " + expectedValue);
}
}
private static void testThreadContentionMonitoring()
throws Exception {
if (!tm.isThreadContentionMonitoringSupported()) return;
// Test setThreadContentionMonitoringEnabled()
checkThreadContentionMonitoring(false);
// Check enabled once
tm.setThreadContentionMonitoringEnabled(true);
checkThreadContentionMonitoring(true);
// Enable it two more times
tm.setThreadContentionMonitoringEnabled(true);
checkThreadContentionMonitoring(true);
tm.setThreadContentionMonitoringEnabled(true);
// Disable once will globally disable the thread contention monitoring
tm.setThreadContentionMonitoringEnabled(false);
checkThreadContentionMonitoring(false);
tm.setThreadContentionMonitoringEnabled(false);
checkThreadContentionMonitoring(false);
tm.setThreadContentionMonitoringEnabled(true);
checkThreadContentionMonitoring(true);
}
private static void checkThreadCpuTime(boolean expectedValue)
throws Exception {
boolean value = tm.isThreadCpuTimeEnabled();
if (value != expectedValue) {
throw new RuntimeException("TEST FAILED: " +
"isThreadCpuTimeEnabled() returns " + value +
" but expected to be " + expectedValue);
}
}
private static void testThreadCpuTime()
throws Exception {
if (!tm.isThreadCpuTimeSupported()) return;
// Test setThreadCpuTimeEnabled()
if (!tm.isThreadCpuTimeEnabled()) {
tm.setThreadCpuTimeEnabled(true);
checkThreadCpuTime(true);
}
tm.setThreadCpuTimeEnabled(false);
checkThreadCpuTime(false);
tm.setThreadCpuTimeEnabled(true);
checkThreadCpuTime(true);
tm.setThreadCpuTimeEnabled(true);
checkThreadCpuTime(true);
tm.setThreadCpuTimeEnabled(true);
// disable globally
tm.setThreadCpuTimeEnabled(false);
checkThreadCpuTime(false);
tm.setThreadCpuTimeEnabled(false);
checkThreadCpuTime(false);
tm.setThreadCpuTimeEnabled(true);
checkThreadCpuTime(true);
}
public static void main(String args[]) throws Exception {
try {
testThreadContentionMonitoring();
testThreadCpuTime();
} finally {
// restore the default
if (tm.isThreadContentionMonitoringSupported()) {
tm.setThreadContentionMonitoringEnabled(false);
}
if (tm.isThreadCpuTimeSupported()) {
tm.setThreadCpuTimeEnabled(false);
}
}
System.out.println("Test passed.");
}
}
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