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  *
  43  * @library /lib /
  44  * @run main/othervm jdk.jfr.api.flightrecorder.TestAddPeriodicEvent
  45  */
  46 public class TestAddPeriodicEvent {
  47 
  48     private static class MyEvent extends Event {
  49 
  50     }
  51 
  52     CountDownLatch latch = new CountDownLatch(3);
  53 
  54     class MyHook implements Runnable {
  55 
  56         private int eventCounter;
  57         private long previousTime;
  58 
  59         @Override
  60         public void run() {
  61             log("Commiting event " + (++eventCounter));
  62             if (previousTime == 0) {
  63                 previousTime = System.currentTimeMillis();
  64             } else {
  65                 long nowTime = System.currentTimeMillis();
  66                 long elapsedTime = nowTime - previousTime;
  67                 previousTime = nowTime;
  68                 log("Elapsed time since the previous event: " + elapsedTime);
  69             }
  70 
  71             commitEvent();
  72             latch.countDown();
  73         }
  74 
  75         private void commitEvent() {
  76             MyEvent event = new MyEvent();
  77             event.commit();
  78         }
  79     }
  80 
  81     public static void main(String[] args) throws Exception {
  82         new TestAddPeriodicEvent().doTest(1000, 3);
  83     }
  84 
  85     private void doTest(long eventDuration, int numOfEvents) throws Exception {
  86         latch = new CountDownLatch(numOfEvents);
  87         MyHook hook = new MyHook();
  88 
  89         Recording r = new Recording();
  90         r.enable(MyEvent.class).withPeriod(Duration.ofMillis(eventDuration));
  91         r.start();
  92 
  93         FlightRecorder.addPeriodicEvent(MyEvent.class, hook);
  94 
  95         latch.await();
  96 
  97         assertTrue(FlightRecorder.removePeriodicEvent(hook));
  98         assertFalse(FlightRecorder.removePeriodicEvent(hook));
  99 
 100         r.stop();
 101         r.close();
 102     }
 103 
 104     private static void log(String text) {
 105         System.out.println(text);
 106     }
 107 }