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/*
* Copyright (c) 2007, 2020, 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
* @key randomness
*
* @summary converted from VM Testbase nsk/monitoring/RuntimeMXBean/RuntimeMXBean001.
* VM Testbase keywords: [quick, monitoring]
*
* @library /vmTestbase
* /test/lib
* @run main/othervm
* nsk.monitoring.RuntimeMXBean.RuntimeMXBean001.RuntimeMXBean001
* -testMode=directly
*/
package nsk.monitoring.RuntimeMXBean.RuntimeMXBean001;
import nsk.share.*;
import nsk.share.test.*;
import nsk.monitoring.share.*;
import java.lang.management.*;
/**
* Test functions of RuntimeMXBean.
*
*
* Checks that values returned by getStartTime() and getUptime()
* measure actual uptime well enough, i.e.
* - start time does not change with time
* - start time + uptime is approximately current time
*/
public class RuntimeMXBean001 extends MonitoringTestBase implements Initializable {
private static final long NANO_MS = 1000000;
private RuntimeMXBean runtime;
private int iterations = 10;
private long maxDiff = 5000;
private int fail_count = 0;
public void initialize() {
runtime = monitoringFactory.getRuntimeMXBean();
}
private static final long getMillis() {
return System.nanoTime() / NANO_MS;
}
private void checkTimes(long startTime, long upTime, String msg) {
if (startTime <= 0)
throw new TestFailure("Invalid start time: " + startTime);
if (upTime <= 0)
throw new TestFailure("Invalid uptime: " + upTime);
}
private void testUptimeOne(long sleepTime) {
long startTime1 = runtime.getStartTime();
long uptime1 = runtime.getUptime();
long time1 = getMillis();
log.info("startTime: " + startTime1 + ", uptime1: " + uptime1 + ", time1: " + time1);
checkTimes(startTime1, uptime1, "Before sleep");
try {
Thread.sleep(sleepTime);
} catch (InterruptedException e) {
throw new TestFailure("Sleep was interrupted", e);
}
long startTime2 = runtime.getStartTime();
long uptime2 = runtime.getUptime();
long time2 = getMillis();
checkTimes(startTime2, uptime2, "After sleep");
if (startTime1 != startTime2)
throw new TestFailure("Start time before sleep: " + startTime1 + " start time after sleep: " + startTime2);
if (uptime2 < uptime1)
throw new TestFailure("Uptime before sleep: " + uptime1 + " uptime after sleep: " + uptime2);
long utDiff = (uptime2 - uptime1);
long tDiff = (time2 - time1);
long flowDiff = Math.abs(utDiff -tDiff);
if (flowDiff > maxDiff) {
throw new TestFailure("Difference between timeflow of uptime and current time is too big: " + flowDiff + ", expecting at most " + maxDiff);
}
}
private void testUptime() {
for (int i = 0; i < iterations; ++i) {
log.info("Iteration: " + i);
testUptimeOne(LocalRandom.randomPauseTime());
}
}
public void run() {
testUptime();
}
public static void main(String[] args) {
Monitoring.runTest(new RuntimeMXBean001(), args);
}
}
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