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 static jdk.test.lib.Asserts.assertFalse;
  29 import static jdk.test.lib.Asserts.assertTrue;
  30 
  31 import java.time.Duration;
  32 import java.util.List;
  33 import java.util.concurrent.CountDownLatch;
  34 
  35 import jdk.jfr.Recording;
  36 import jdk.jfr.consumer.RecordedEvent;
  37 import jdk.test.lib.jfr.EventNames;
  38 import jdk.test.lib.jfr.Events;
  39 import jdk.test.lib.management.ThreadMXBeanTool;
  40 import jdk.test.lib.thread.TestThread;
  41 import jdk.test.lib.thread.XRun;
  42 
  43 /*
  44  * @test
  45  * @key jfr
  46  * @library /test/lib
  47  *
  48  * @run main/othervm jdk.jfr.event.runtime.TestJavaBlockedEvent
  49  */
  50 public class TestJavaBlockedEvent {
  51     private static final String EVENT_NAME = EventNames.JavaMonitorEnter;
  52     private static final long THRESHOLD_MILLIS = 1;
  53 
  54     static class Lock {
  55     }
  56 
  57     public static void main(String[] args) throws Throwable {
  58         Recording recording = new Recording();
  59 
  60         recording.enable(EVENT_NAME).withThreshold(Duration.ofMillis(THRESHOLD_MILLIS));
  61         recording.start();
  62         final Lock lock = new Lock();
  63         final CountDownLatch blockerInLock = new CountDownLatch(1);
  64         final CountDownLatch blockingFinished = new CountDownLatch(1);
  65         final CountDownLatch blockedFinished = new CountDownLatch(1);
  66         TestThread blockerThread = new TestThread(new XRun() {
  67             @Override
  68             public void xrun() throws Throwable {
  69                 synchronized (lock) {
  70                     blockerInLock.countDown();
  71                     blockingFinished.await();
  72                 }
  73                 blockedFinished.await();
  74             }
  75         });
  76 
  77         TestThread blockedThread = new TestThread(new XRun() {
  78             @Override
  79             public void xrun() throws Throwable {
  80                 blockerInLock.await();
  81                 synchronized (lock) {
  82                     blockedFinished.countDown();
  83                 }
  84             }
  85         });
  86         blockerThread.start();
  87         blockedThread.start();
  88 
  89         blockerInLock.await();
  90         ThreadMXBeanTool.waitUntilBlockingOnObject(blockedThread, Thread.State.BLOCKED, lock);
  91         Thread.sleep(2 * THRESHOLD_MILLIS);
  92         blockingFinished.countDown();
  93         blockedFinished.await();
  94 
  95         blockedThread.join();
  96         blockerThread.join();
  97         recording.stop();
  98 
  99         List<RecordedEvent> events = Events.fromRecording(recording);
 100         boolean isAnyFound = false;
 101         for (RecordedEvent event : events) {
 102             System.out.println("Event:" + event);
 103             if (event.getThread().getJavaThreadId() == blockedThread.getId()) {
 104                 if (isMyLock(Events.assertField(event, "monitorClass.name").getValue())) {
 105                     Events.assertEventThread(event, "previousOwner", blockerThread);
 106                     Events.assertField(event, "address").above(0L);
 107                     assertFalse(isAnyFound, "Found multiple events");
 108                     isAnyFound = true;
 109                 }
 110             }
 111         }
 112         assertTrue(isAnyFound, "No blocking event from " + blockedThread.getName());
 113     }
 114 
 115     private static boolean isMyLock(String className) {
 116         return Lock.class.getName().replace('.', '/').equals(className);
 117     }
 118 }