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.util.concurrent.CountDownLatch;

    29 

    30 import jdk.jfr.Event;

    31 import jdk.jfr.Recording;

    32 import jdk.jfr.consumer.RecordingStream;

    33 

    34 /**

    35  * @test

    36  * @summary Test that it is possible to iterate over chunk without normal events

    37  * @key jfr

    38  * @requires vm.hasJFR

    39  * @library /test/lib

    40  * @run main/othervm jdk.jfr.api.consumer.streaming.TestEmptyChunks

    41  */

    42 public class TestEmptyChunks {

    43     static class EndEvent extends Event {

    44     }

    45 

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

    47         CountDownLatch end = new CountDownLatch(1);

    48         CountDownLatch firstFlush = new CountDownLatch(1);

    49         try (RecordingStream es = new RecordingStream()) {

    50             es.onEvent(EndEvent.class.getName(), e -> {

    51                 end.countDown();

    52             });

    53             es.onFlush(() -> {

    54                 firstFlush.countDown();

    55             });

    56             es.startAsync();

    57             System.out.println("Invoked startAsync()");

    58             // Wait for stream thread to start

    59             firstFlush.await();

    60             System.out.println("Stream thread active");

    61             Recording r1 = new Recording();

    62             r1.start();

    63             System.out.println("Chunk 1 started");

    64             Recording r2 = new Recording();

    65             r2.start();

    66             System.out.println("Chunk 2 started");

    67             Recording r3 = new Recording();

    68             r3.start();

    69             System.out.println("Chunk 3 started");

    70             r2.stop();

    71             System.out.println("Chunk 4 started");

    72             r3.stop();

    73             System.out.println("Chunk 5 started");

    74             EndEvent e = new EndEvent();

    75             e.commit();

    76             end.await();

    77             r1.stop();

    78             System.out.println("Chunk 5 ended");

    79             r1.close();

    80             r2.close();

    81             r3.close();

    82         }

    83     }

    84 }