262 lines
9.5 KiB
Java
262 lines
9.5 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 mbean.getThreadCount()
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* mbean.getTotalStartedThreadCount()
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* mbean.getPeakThreadCount()
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* mbean.getDaemonThreadCount()
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* @author Alexei Guibadoulline
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*
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* @run main ThreadCounts
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*/
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import java.lang.management.*;
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public class ThreadCounts {
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static final int DAEMON_THREADS = 21;
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static final int USER_THREADS_1 = 11;
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static final int USER_THREADS_2 = 9;
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static final int USER_THREADS = USER_THREADS_1 + USER_THREADS_2;
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static final int ALL_THREADS = DAEMON_THREADS + USER_THREADS;
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private static volatile boolean live[] = new boolean[ALL_THREADS];
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private ThreadMXBean mbean = ManagementFactory.getThreadMXBean();
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private static boolean testFailed = false;
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// barrier for threads communication
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private static Barrier barrier = new Barrier(DAEMON_THREADS);
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public static void main(String argv[]) {
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ThreadCounts test = new ThreadCounts();
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Thread allThreads[] = new Thread[ALL_THREADS];
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// Start DAEMON_THREADS threads and wait to be sure they all are alive
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barrier.set(DAEMON_THREADS);
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for (int i = 0; i < DAEMON_THREADS; i++) {
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live[i] = true;
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allThreads[i] = new MyThread(i);
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allThreads[i].setDaemon(true);
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allThreads[i].start();
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}
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// wait until all threads have started.
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barrier.await();
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System.out.println("Number of daemon threads added = " +
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DAEMON_THREADS);
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// Check mbean now
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if ( (!test.checkCount (DAEMON_THREADS)) ||
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(!test.checkCreated(DAEMON_THREADS)) ||
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(!test.checkPeak (DAEMON_THREADS)) ||
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(!test.checkDaemon (DAEMON_THREADS))
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)
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testFailed = true;
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// Start USER_THREADS_1 threads and wait to be sure they all are alive
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barrier.set(USER_THREADS_1);
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for (int i = DAEMON_THREADS; i < DAEMON_THREADS + USER_THREADS_1; i++) {
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live[i] = true;
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allThreads[i] = new MyThread(i);
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allThreads[i].setDaemon(false);
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allThreads[i].start();
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}
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// wait until user1 threads have started.
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barrier.await();
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System.out.println("Number of threads added = " +
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USER_THREADS_1);
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// Check mbean now
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if ( (!test.checkCount (DAEMON_THREADS + USER_THREADS_1)) ||
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(!test.checkCreated(DAEMON_THREADS + USER_THREADS_1)) ||
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(!test.checkPeak (DAEMON_THREADS + USER_THREADS_1)) ||
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(!test.checkDaemon (DAEMON_THREADS))
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)
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testFailed = true;
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// Stop daemon threads and wait to be sure they all are dead
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barrier.set(DAEMON_THREADS);
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for (int i = 0; i < DAEMON_THREADS; i++) {
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live[i] = false;
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}
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// wait until daemon threads terminated.
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barrier.await();
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System.out.println("Daemon threads terminated.");
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// Check mbean now
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if ( (!test.checkCount (USER_THREADS_1)) ||
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(!test.checkCreated(DAEMON_THREADS + USER_THREADS_1)) ||
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(!test.checkPeak (DAEMON_THREADS + USER_THREADS_1)) ||
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(!test.checkDaemon (0))
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)
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testFailed = true;
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// Start USER_THREADS_2 threads and wait to be sure they all are alive
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barrier.set(USER_THREADS_2);
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for (int i = DAEMON_THREADS + USER_THREADS_1; i < ALL_THREADS; i++) {
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live[i] = true;
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allThreads[i] = new MyThread(i);
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allThreads[i].setDaemon(false);
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allThreads[i].start();
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}
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// wait until user2 threads have started.
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barrier.await();
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System.out.println("Number of threads added = " +
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USER_THREADS_2);
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// Check mbean now
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if ( (!test.checkCount (USER_THREADS_1 + USER_THREADS_2)) ||
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(!test.checkCreated(ALL_THREADS)) ||
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(!test.checkPeak (DAEMON_THREADS + USER_THREADS_1)) ||
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(!test.checkDaemon (0))
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)
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testFailed = true;
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// Stop user1 threads and wait to be sure they all are dead
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barrier.set(USER_THREADS_1);
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for (int i = DAEMON_THREADS; i < DAEMON_THREADS + USER_THREADS_1; i++) {
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live[i] = false;
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}
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// wait until user1 threads terminated.
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barrier.await();
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System.out.println("Number of threads terminated = " +
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USER_THREADS_1);
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// Check mbean now
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if ( (!test.checkCount (USER_THREADS_2)) ||
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(!test.checkCreated(ALL_THREADS)) ||
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(!test.checkPeak (DAEMON_THREADS + USER_THREADS_1)) ||
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(!test.checkDaemon (0))
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)
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testFailed = true;
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// Stop user2 threads and wait to be sure they all are dead
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barrier.set(USER_THREADS_2);
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for (int i = DAEMON_THREADS + USER_THREADS_1; i < ALL_THREADS; i++) {
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live[i] = false;
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}
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// wait until user2 threads terminated.
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barrier.await();
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System.out.println("Number of threads terminated = " +
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USER_THREADS_2);
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// Check mbean now
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if ( (!test.checkCount (0)) ||
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(!test.checkCreated(ALL_THREADS)) ||
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(!test.checkPeak (DAEMON_THREADS + USER_THREADS_1)) ||
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(!test.checkDaemon (0))
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)
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testFailed = true;
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if (testFailed)
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throw new RuntimeException("TEST FAILED.");
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System.out.println("Test passed.");
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}
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// Nobody knows how many threads are in the JVM in the exact moment. The
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// only thing to check for sure is minimal number of threads alive (or
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// created) in the application
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private boolean checkCount(long min) {
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long result = mbean.getThreadCount();
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if (result < min) {
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System.err.println("TEST FAILED: " +
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"Minimal number of live threads is " +
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min +
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". ThreadMXBean.getThreadCount() returned " +
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result);
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return false;
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}
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return true;
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}
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private boolean checkCreated(long min) {
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long result = mbean.getTotalStartedThreadCount();
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if (result < min) {
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System.err.println("TEST FAILED: " +
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"Minimal number of created threads is " +
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min +
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". ThreadMXBean.getTotalStartedThreadCount() "+
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"returned " + result);
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return false;
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}
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return true;
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}
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private boolean checkPeak(long min) {
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long result = mbean.getPeakThreadCount();
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if (result < min) {
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System.err.println("TEST FAILED: " +
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"Minimal peak thread count is " +
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min +
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". ThreadMXBean.getPeakThreadCount() "+
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"returned " + result);
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return false;
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}
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return true;
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}
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private boolean checkDaemon(long min) {
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long result = mbean.getDaemonThreadCount();
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if (result < min) {
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System.err.println("TEST FAILED: " +
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"Minimal number of daemon thread count is " +
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min +
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"ThreadMXBean.getDaemonThreadCount() returned "
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+ result);
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return false;
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}
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return true;
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}
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// The MyThread thread lives as long as correspondent live[i] value is true
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private static class MyThread extends Thread {
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int id;
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MyThread(int id) {
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this.id = id;
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}
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public void run() {
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// signal started
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barrier.signal();
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while (live[id]) {
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try {
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sleep(100);
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} catch (InterruptedException e) {
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System.out.println("Unexpected exception is thrown.");
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e.printStackTrace(System.out);
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testFailed = true;
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}
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}
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// signal about to exit
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barrier.signal();
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}
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}
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}
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