1 /*

     2  * Copyright (c) 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.api.flightrecorder;

    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.concurrent.CountDownLatch;

    33 

    34 import jdk.jfr.Event;

    35 import jdk.jfr.FlightRecorder;

    36 import jdk.jfr.Recording;

    37 

    38 /*

    39  * @test

    40  * @summary

    41  * @key jfr

    42  * @library /test/lib

    43  * @run main/othervm jdk.jfr.api.flightrecorder.TestAddPeriodicEvent

    44  */

    45 public class TestAddPeriodicEvent {

    46 

    47     private static class MyEvent extends Event {

    48 

    49     }

    50 

    51     CountDownLatch latch = new CountDownLatch(3);

    52 

    53     class MyHook implements Runnable {

    54 

    55         private int eventCounter;

    56         private long previousTime;

    57 

    58         @Override

    59         public void run() {

    60             log("Commiting event " + (++eventCounter));

    61             if (previousTime == 0) {

    62                 previousTime = System.currentTimeMillis();

    63             } else {

    64                 long nowTime = System.currentTimeMillis();

    65                 long elapsedTime = nowTime - previousTime;

    66                 previousTime = nowTime;

    67                 log("Elapsed time since the previous event: " + elapsedTime);

    68             }

    69 

    70             commitEvent();

    71             latch.countDown();

    72         }

    73 

    74         private void commitEvent() {

    75             MyEvent event = new MyEvent();

    76             event.commit();

    77         }

    78     }

    79 

    80     public static void main(String[] args) throws Exception {

    81         new TestAddPeriodicEvent().doTest(1000, 3);

    82     }

    83 

    84     private void doTest(long eventDuration, int numOfEvents) throws Exception {

    85         latch = new CountDownLatch(numOfEvents);

    86         MyHook hook = new MyHook();

    87 

    88         Recording r = new Recording();

    89         r.enable(MyEvent.class).withPeriod(Duration.ofMillis(eventDuration));

    90         r.start();

    91 

    92         FlightRecorder.addPeriodicEvent(MyEvent.class, hook);

    93 

    94         latch.await();

    95 

    96         assertTrue(FlightRecorder.removePeriodicEvent(hook));

    97         assertFalse(FlightRecorder.removePeriodicEvent(hook));

    98 

    99         r.stop();

   100         r.close();

   101     }

   102 

   103     private static void log(String text) {

   104         System.out.println(text);

   105     }

   106 }