1 /*
   2  * Copyright (c) 2013, 2019, 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.testlibrary.jfr.EventNames;
  35 import jdk.testlibrary.jfr.Events;
  36 
  37 /*
  38  * @test
  39  * @key jfr
  40  * @library /lib/testlibrary
  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 }