1 /*

     2  * Copyright (c) 2019, 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.consumer.streaming;

    27 

    28 import java.time.Duration;

    29 import java.util.concurrent.CountDownLatch;

    30 

    31 import jdk.jfr.Enabled;

    32 import jdk.jfr.Event;

    33 import jdk.jfr.FlightRecorder;

    34 import jdk.jfr.consumer.RecordingStream;

    35 

    36 /**

    37  * @test

    38  * @summary Verifies that it is possible to stream contents from specified event

    39  *          settings

    40  * @key jfr

    41  * @requires vm.hasJFR

    42  * @library /test/lib

    43  *

    44  * @run main/othervm jdk.jfr.api.consumer.streaming.TestEnableEvents

    45  */

    46 public class TestEnableEvents {

    47 

    48     @Enabled(false)

    49     static class HorseEvent extends Event {

    50     }

    51 

    52     @Enabled(false)

    53     static class ElephantEvent extends Event {

    54     }

    55 

    56     @Enabled(false)

    57     static class TigerEvent extends Event {

    58     }

    59 

    60     public static void main(String... args) throws Exception {

    61         CountDownLatch elephantLatch = new CountDownLatch(1);

    62         CountDownLatch tigerLatch = new CountDownLatch(1);

    63         CountDownLatch horseLatch = new CountDownLatch(1);

    64 

    65         FlightRecorder.addPeriodicEvent(ElephantEvent.class, () -> {

    66             HorseEvent ze = new HorseEvent();

    67             ze.commit();

    68         });

    69 

    70         try (RecordingStream s = new RecordingStream()) {

    71             s.enable(HorseEvent.class.getName()).withPeriod(Duration.ofMillis(50));

    72             s.enable(TigerEvent.class.getName());

    73             s.enable(ElephantEvent.class.getName());

    74             s.onEvent(TigerEvent.class.getName(), e -> {

    75                 System.out.println("Event: " + e.getEventType().getName());

    76                 System.out.println("Found tiger!");

    77                 tigerLatch.countDown();

    78             });

    79             s.onEvent(HorseEvent.class.getName(), e -> {

    80                 System.out.println("Found horse!");

    81                 horseLatch.countDown();

    82             });

    83             s.onEvent(ElephantEvent.class.getName(), e -> {

    84                 System.out.println("Found elelphant!");

    85                 elephantLatch.countDown();

    86             });

    87             s.startAsync();

    88             TigerEvent te = new TigerEvent();

    89             te.commit();

    90             ElephantEvent ee = new ElephantEvent();

    91             ee.commit();

    92             elephantLatch.await();

    93             horseLatch.await();

    94             tigerLatch.await();

    95         }

    96 

    97     }

    98 

    99 }