1 /*

     2  * Copyright (c) 2013, 2018, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Oracle designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    22  * or visit www.oracle.com if you need additional information or have any

    23  * questions.

    24  */

    25 

    26 package jdk.jfr.event.runtime;

    27 

    28 import java.time.Duration;

    29 import java.util.List;

    30 import java.util.concurrent.CountDownLatch;

    31 

    32 import jdk.jfr.Recording;

    33 import jdk.jfr.consumer.RecordedEvent;

    34 import jdk.test.lib.jfr.EventNames;

    35 import jdk.test.lib.jfr.Events;

    36 

    37 /*

    38  * @test

    39  * @key jfr

    40  * @library /test/lib

    41  * @run main/othervm jdk.jfr.event.runtime.TestThreadStartEndEvents

    42  */

    43 

    44 /**

    45  * Starts and stops a number of threads in order.

    46  * Verifies that events are in the same order.

    47  */

    48 public class TestThreadStartEndEvents {

    49     private final static String EVENT_NAME_THREAD_START = EventNames.ThreadStart;

    50     private final static String EVENT_NAME_THREAD_END = EventNames.ThreadEnd;

    51     private static final String THREAD_NAME_PREFIX = "TestThread-";

    52 

    53     public static void main(String[] args) throws Throwable {

    54         // Test Java Thread Start event

    55         Recording recording = new Recording();

    56         recording.enable(EVENT_NAME_THREAD_START).withThreshold(Duration.ofMillis(0));

    57         recording.enable(EVENT_NAME_THREAD_END).withThreshold(Duration.ofMillis(0));

    58         recording.start();

    59         LatchedThread[] threads = startThreads();

    60         stopThreads(threads);

    61         recording.stop();

    62 

    63         int currThreadIndex = 0;

    64         long currentThreadId = Thread.currentThread().getId();

    65         List<RecordedEvent> events = Events.fromRecording(recording);

    66         Events.hasEvents(events);

    67         for (RecordedEvent event : events) {

    68             System.out.println("Event:" + event);

    69             if (event.getThread().getJavaThreadId() != currentThreadId) {

    70                 continue;

    71             }

    72             // Threads should be started and stopped in the correct order.

    73             Events.assertEventThread(event, threads[currThreadIndex % threads.length]);

    74             String eventName = currThreadIndex < threads.length ? EVENT_NAME_THREAD_START : EVENT_NAME_THREAD_END;

    75             if (!eventName.equals(event.getEventType().getName())) {

    76                 throw new Exception("Expected event of tyoe " + eventName + " but got " + event.getEventType().getName());

    77             }

    78             currThreadIndex++;

    79         }

    80     }

    81 

    82     private static LatchedThread[] startThreads() {

    83         LatchedThread threads[] = new LatchedThread[10];

    84         ThreadGroup threadGroup = new ThreadGroup("TestThreadGroup");

    85         for (int i = 0; i < threads.length; i++) {

    86             threads[i] = new LatchedThread(threadGroup, THREAD_NAME_PREFIX + i);

    87             threads[i].startThread();

    88             System.out.println("Started thread id=" + threads[i].getId());

    89         }

    90         return threads;

    91     }

    92 

    93     private static void stopThreads(LatchedThread[] threads) {

    94         for (LatchedThread thread : threads) {

    95             thread.stopThread();

    96             while (thread.isAlive()) {

    97                 try {

    98                     Thread.sleep(5);

    99                 } catch (InterruptedException e) {

   100                     e.printStackTrace();

   101                 }

   102             }

   103         }

   104     }

   105 

   106     private static class LatchedThread extends Thread {

   107         private final CountDownLatch start = new CountDownLatch(1);

   108         private final CountDownLatch stop = new CountDownLatch(1);

   109 

   110         public LatchedThread(ThreadGroup threadGroup, String name) {

   111             super(threadGroup, name);

   112         }

   113 

   114         public void run() {

   115             start.countDown();

   116             try {

   117                 stop.await();

   118             } catch (InterruptedException e) {

   119                 e.printStackTrace();

   120             }

   121         }

   122 

   123         public void startThread() {

   124             this.start();

   125             try {

   126                 start.await();

   127             } catch (InterruptedException e) {

   128                 e.printStackTrace();

   129             }

   130         }

   131 

   132         public void stopThread() {

   133             stop.countDown();

   134         }

   135     }

   136 

   137 }