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 java.util.concurrent.atomic.AtomicInteger;
  31 
  32 import jdk.jfr.FlightRecorder;
  33 import jdk.jfr.FlightRecorderListener;
  34 
  35 /**
  36  * @test
  37  * @summary Test Flight Recorder initialization callback is only called once
  38  * @key jfr
  39  * @requires vm.hasJFR
  40  * @library /test/lib
  41  * @run main/othervm jdk.jfr.api.flightrecorder.TestRecorderInitializationCallback
  42  */
  43 public class TestRecorderInitializationCallback {
  44 
  45     private static class TestListener implements FlightRecorderListener {
  46         private final AtomicInteger count = new AtomicInteger();
  47 
  48         @Override
  49         public void recorderInitialized(FlightRecorder recorder) {
  50             count.incrementAndGet();
  51             System.out.println("recorderInitialized: " + recorder + " count=" + count);
  52             // Get the recorder again, should not trigger listener
  53             FlightRecorder.getFlightRecorder();
  54         }
  55     }
  56 
  57     public static void main(String[] args) throws Throwable {
  58         TestListener t = new TestListener();
  59         FlightRecorder.addListener(t);
  60         // trigger initialization
  61         FlightRecorder.getFlightRecorder();
  62         assertEquals(1, t.count.intValue(), "Expected 1 notification, got " + t.count);
  63     }
  64 }