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  *
  38  * @library /lib /
  39  * @run main/othervm jdk.jfr.api.flightrecorder.TestRegisterUnregisterEvent
  40  */
  41 public class TestRegisterUnregisterEvent {
  42 
  43     public static void main(String[] args) throws Throwable {
  44         // Register before Flight Recorder is started
  45         FlightRecorder.register(MyEvent.class);
  46         // Repeat
  47         FlightRecorder.register(MyEvent.class);
  48 
  49         FlightRecorder recorder = FlightRecorder.getFlightRecorder();
  50         int count = 0;
  51         for (EventType et : recorder.getEventTypes()) {
  52             if (et.getName().equals(MyEvent.class.getName())) {
  53                 count++;
  54             }
  55         }
  56         assertEquals(1, count);
  57 
  58         FlightRecorder.unregister(MyEvent.class);
  59 
  60         count = 0;
  61         for (EventType et : recorder.getEventTypes()) {
  62             if (et.getName().equals(MyEvent.class.getName())) {
  63                 count++;
  64             }
  65         }
  66         assertEquals(0, count);
  67 
  68         FlightRecorder.register(MyEvent.class);
  69 
  70         count = 0;
  71         for (EventType et : recorder.getEventTypes()) {
  72             if (et.getName().equals(MyEvent.class.getName())) {
  73                 count++;
  74             }
  75         }
  76         assertEquals(1, count);
  77 
  78     }
  79 }
  80 
  81 class MyEvent extends Event {
  82 }