134 lines
5.0 KiB
Java
134 lines
5.0 KiB
Java
/*
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* Copyright (c) 2003, 2015, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 4530538
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* @summary Basic unit test of RuntimeMXBean.getUptime()
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* @author Alexei Guibadoulline
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*/
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import java.lang.management.*;
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public class UpTime {
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static final long DELAY = 5; // Seconds
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static final long TIMEOUT = 30; // Minutes
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static final long MULTIPLIER = 1000; // millisecond ticks
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private static final RuntimeMXBean metrics
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= ManagementFactory.getRuntimeMXBean();
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public static void main(String argv[]) throws Exception {
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long jvmStartTime = metrics.getStartTime();
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// this will get an aproximate JVM uptime before starting this test
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long jvmUptime = System.currentTimeMillis() - jvmStartTime;
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long systemStartOuter = System_milliTime();
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long metricsStart = metrics.getUptime();
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long systemStartInner = System_milliTime();
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// This JVM might have been running for some time if this test runs
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// in samevm mode. The sanity check should apply to the test uptime.
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long testUptime = metricsStart - jvmUptime;
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// If uptime is more than 30 minutes then it looks like a bug in
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// the method
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if (testUptime > TIMEOUT * 60 * MULTIPLIER)
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throw new RuntimeException("Uptime of the JVM is more than 30 "
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+ "minutes ("
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+ (metricsStart / 60 / MULTIPLIER)
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+ " minutes).");
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// Wait for DELAY seconds
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Object o = new Object();
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while (System_milliTime() < systemStartInner + DELAY * MULTIPLIER) {
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synchronized (o) {
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try {
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o.wait(DELAY * 1000);
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} catch (Exception e) {
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e.printStackTrace();
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throw e;
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}
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}
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}
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long systemEndInner = System_milliTime();
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long metricsEnd = metrics.getUptime();
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long systemEndOuter = System_milliTime();
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long systemDifferenceInner = systemEndInner - systemStartInner;
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long systemDifferenceOuter = systemEndOuter - systemStartOuter;
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long metricsDifference = metricsEnd - metricsStart;
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// Check the flow of time in RuntimeMXBean.getUptime(). See the
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// picture below.
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// The measured times can be off by 1 due to conversions from
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// nanoseconds to milliseconds, using different channels to read the
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// HR timer and rounding error. Bigger difference will make the test
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// fail.
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if (metricsDifference - systemDifferenceInner < -1)
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throw new RuntimeException("Flow of the time in "
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+ "RuntimeMXBean.getUptime() ("
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+ metricsDifference + ") is slower than "
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+ " in system (" + systemDifferenceInner
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+ ")");
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if (metricsDifference - systemDifferenceOuter > 1)
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throw new RuntimeException("Flow of the time in "
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+ "RuntimeMXBean.getUptime() ("
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+ metricsDifference + ") is faster than "
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+ "in system (" + systemDifferenceOuter
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+ ")");
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System.out.println("Test passed.");
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}
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private static long System_milliTime() {
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return System.nanoTime() / 1000000; // nanoseconds / milliseconds;
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}
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}
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/*
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A picture to describe the second testcase that checks the flow of time in
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RuntimeMXBean.getUptime()
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start
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o1 u1 i1 Sleep for DELAY minutes i2 u2 o2
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|-------|---|---|--------------------------------|---|---|---------------> time
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The following inequality (checked by the test) must always be true:
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o2-o1 >= u2-u1 >= i2-i1
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In the test:
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i1 - systemStartInner
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i2 - systemEndInner
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o1 - systemStartOuter
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o2 - systemEndOuter
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u1 - metricsStart
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u2 - metricsEnd
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*/
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