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  * @library /test/lib

    40  * @run main/othervm jdk.jfr.api.flightrecorder.TestRecorderInitializationCallback

    41  */

    42 public class TestRecorderInitializationCallback {

    43 

    44     private static class TestListener implements FlightRecorderListener {

    45         private final AtomicInteger count = new AtomicInteger();

    46 

    47         @Override

    48         public void recorderInitialized(FlightRecorder recorder) {

    49             count.incrementAndGet();

    50             System.out.println("recorderInitialized: " + recorder + " count=" + count);

    51             // Get the recorder again, should not trigger listener

    52             FlightRecorder.getFlightRecorder();

    53         }

    54     }

    55 

    56     public static void main(String[] args) throws Throwable {

    57         TestListener t = new TestListener();

    58         FlightRecorder.addListener(t);

    59         // trigger initialization

    60         FlightRecorder.getFlightRecorder();

    61         assertEquals(1, t.count.intValue(), "Expected 1 notification, got " + t.count);

    62     }

    63 }