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