1 /*
   2  * Copyright (c) 2018, 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.api.flightrecorder;
  27 
  28 import static jdk.testlibrary.Asserts.assertFalse;
  29 import static jdk.testlibrary.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 /lib/testlibrary
  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 }