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 }