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.assertEquals; 29 30 import jdk.jfr.Event; 31 import jdk.jfr.EventType; 32 import jdk.jfr.FlightRecorder; 33 34 /* 35 * @test 36 * @key jfr 37 * @library /test/lib 38 * @run main/othervm jdk.jfr.api.flightrecorder.TestRegisterUnregisterEvent 39 */ 40 public class TestRegisterUnregisterEvent { 41 42 public static void main(String[] args) throws Throwable { 43 // Register before Flight Recorder is started 44 FlightRecorder.register(MyEvent.class); 45 // Repeat 46 FlightRecorder.register(MyEvent.class); 47 48 FlightRecorder recorder = FlightRecorder.getFlightRecorder(); 49 int count = 0; 50 for (EventType et : recorder.getEventTypes()) { 51 if (et.getName().equals(MyEvent.class.getName())) { 52 count++; 53 } 54 } 55 assertEquals(1, count); 56 57 FlightRecorder.unregister(MyEvent.class); 58 59 count = 0; 60 for (EventType et : recorder.getEventTypes()) { 61 if (et.getName().equals(MyEvent.class.getName())) { 62 count++; 63 } 64 } 65 assertEquals(0, count); 66 67 FlightRecorder.register(MyEvent.class); 68 69 count = 0; 70 for (EventType et : recorder.getEventTypes()) { 71 if (et.getName().equals(MyEvent.class.getName())) { 72 count++; 73 } 74 } 75 assertEquals(1, count); 76 77 } 78 } 79 80 class MyEvent extends Event { 81 }