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.assertTrue;
  29 
  30 import java.lang.management.ManagementFactory;
  31 import java.lang.management.ThreadMXBean;
  32 import java.time.Duration;
  33 import java.util.List;
  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 
  40 /**
  41  * @test
  42  * @key jfr
  43  * @requires vm.hasJFR
  44  * @library /test/lib
  45  *
  46  * @run main/othervm jdk.jfr.event.runtime.TestJavaThreadStatisticsEventBean
  47  */
  48 public class TestJavaThreadStatisticsEventBean {
  49     private final static String EVENT_NAME = EventNames.JavaThreadStatistics;
  50 
  51     // Compare JFR thread counts to ThreadMXBean counts
  52     public static void main(String[] args) throws Throwable {
  53         long mxDaemonCount = -1;
  54         long mxActiveCount = -1;
  55 
  56         // Loop until we are sure no threads were started during the recording.
  57         Recording recording = null;
  58         ThreadMXBean mxBean = ManagementFactory.getThreadMXBean();
  59         long totalCountBefore = -1;
  60         while (totalCountBefore != mxBean.getTotalStartedThreadCount()) {
  61             recording = new Recording();
  62             recording.enable(EVENT_NAME).withThreshold(Duration.ofMillis(10));
  63             totalCountBefore = mxBean.getTotalStartedThreadCount();
  64             recording.start();
  65             mxDaemonCount = mxBean.getDaemonThreadCount();
  66             mxActiveCount = mxBean.getThreadCount();
  67             recording.stop();
  68             final String msg = "testCountByMXBean: threadsBefore=%d, threadsAfter=%d%n";
  69             System.out.format(msg, totalCountBefore, mxBean.getTotalStartedThreadCount());
  70         }
  71 
  72         List<RecordedEvent> events= Events.fromRecording(recording);
  73         boolean isAnyFound = false;
  74         for (RecordedEvent event : events) {
  75             System.out.println("Event:" + event);
  76             isAnyFound = true;
  77             Events.assertField(event, "daemonCount").equal(mxDaemonCount);
  78             Events.assertField(event, "activeCount").equal(mxActiveCount);
  79             Events.assertField(event, "accumulatedCount").atLeast(mxActiveCount);
  80             Events.assertField(event, "peakCount").atLeast(mxActiveCount);
  81         }
  82         assertTrue(isAnyFound, "Correct event not found");
  83     }
  84 
  85 }