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.time.Duration;

    31 import java.util.ArrayList;

    32 import java.util.List;

    33 import java.util.Random;

    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  * @library /test/lib

    44  * @run main/othervm jdk.jfr.event.runtime.TestJavaThreadStatisticsEvent

    45  */

    46 public class TestJavaThreadStatisticsEvent {

    47     private static final String EVENT_NAME = EventNames.JavaThreadStatistics;

    48 

    49     private static final int THREAD_COUNT = 10;

    50     private static final Random RAND = new Random(4711);

    51 

    52     // verify thread count: 0 <= daemon <= active <= peak <= accumulated.

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

    54         Recording recording = new Recording();

    55         recording.enable(EVENT_NAME).withThreshold(Duration.ofMillis(10));

    56         recording.start();

    57 

    58         List<Thread> threads = new ArrayList<>();

    59         for (int i = 0; i < THREAD_COUNT; i++) {

    60             Thread thread = new Thread(TestJavaThreadStatisticsEvent::sleepRandom);

    61             thread.start();

    62             threads.add(thread);

    63         }

    64         for (Thread thread : threads) {

    65             thread.join();

    66         }

    67 

    68         recording.stop();

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

    70         boolean isAnyFound = false;

    71         for (RecordedEvent event : events) {

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

    73             isAnyFound = true;

    74             // verify thread count: 0 <= daemon <= active <= peak <= accumulated.

    75             long daemonCount = Events.assertField(event, "daemonCount").atLeast(0L).getValue();

    76             long activeCount = Events.assertField(event, "activeCount").atLeast(daemonCount).getValue();

    77             long peakCount = Events.assertField(event, "peakCount").atLeast(activeCount).atLeast(1L).getValue();

    78             Events.assertField(event, "accumulatedCount").atLeast(peakCount).getValue();

    79         }

    80         assertTrue(isAnyFound, "Correct event not found");

    81     }

    82 

    83     static void sleepRandom() {

    84         try {

    85             Thread.sleep(RAND.nextInt(10));

    86         } catch (InterruptedException e) {

    87             e.printStackTrace();

    88         }

    89     }

    90 }