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 import static jdk.test.lib.Asserts.assertTrue;

    28 

    29 import java.util.concurrent.TimeUnit;

    30 import java.util.concurrent.locks.Condition;

    31 import java.util.concurrent.locks.Lock;

    32 import java.util.concurrent.locks.ReentrantLock;

    33 

    34 import jdk.jfr.FlightRecorder;

    35 import jdk.jfr.FlightRecorderListener;

    36 

    37 /*

    38  * @test

    39  * @key jfr

    40  * @library /test/lib

    41  * @run main/othervm jdk.jfr.api.flightrecorder.TestFlightRecorderListenerRecorderInitialized

    42  */

    43 public class TestFlightRecorderListenerRecorderInitialized {

    44 

    45     /**

    46      * Utility class to wait/notify

    47      */

    48     private static class Signal {

    49 

    50         private static volatile boolean signalled;

    51         private static final Lock lock = new ReentrantLock();

    52         private static final Condition cond = lock.newCondition();

    53 

    54         private static void waitFor(long timeout, TimeUnit timeUnit) throws InterruptedException {

    55             try {

    56                 lock.lock();

    57                 if (!signalled) {

    58                     log("Waiting for FlightRecorder.recorderInitialized notification...");

    59                     cond.await(timeout, timeUnit);

    60                 }

    61             } finally {

    62                 lock.unlock();

    63             }

    64         }

    65 

    66         private static void signal() {

    67             try {

    68                 lock.lock();

    69                 signalled = true;

    70                 cond.signalAll();

    71             } finally {

    72                 lock.unlock();

    73             }

    74         }

    75     };

    76 

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

    78         FlightRecorder.addListener(new FlightRecorderListener() {

    79 

    80             @Override

    81             public void recorderInitialized(FlightRecorder recorder) {

    82                 log("Recorder initialized");

    83                 Signal.signal();

    84             }

    85 

    86         });

    87         FlightRecorder.getFlightRecorder();

    88 

    89         Signal.waitFor(3, TimeUnit.SECONDS);

    90 

    91         assertTrue(Signal.signalled, "FlightRecorderListener.recorderInitialized has not been called");

    92 

    93     }

    94 

    95     private static void log(String s) {

    96         System.out.println(s);

    97     }

    98 }