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 package jdk.jfr.api.consumer.recordingstream;

    26 

    27 import java.util.concurrent.CountDownLatch;

    28 

    29 import jdk.jfr.Event;

    30 import jdk.jfr.consumer.RecordingStream;

    31 

    32 /**

    33  * @test

    34  * @summary Tests RecordingStream::onFlush(...)

    35  * @key jfr

    36  * @requires vm.hasJFR

    37  * @library /test/lib

    38  * @run main/othervm jdk.jfr.api.consumer.recordingstream.TestOnFlush

    39  */

    40 public class TestOnFlush {

    41 

    42     static class OneEvent extends Event {

    43     }

    44 

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

    46         testOnFLushNull();

    47         testOneEvent();

    48         testNoEvent();

    49     }

    50 

    51     private static void testOnFLushNull() {

    52         try (RecordingStream rs = new RecordingStream()) {

    53            try {

    54                rs.onFlush(null);

    55                throw new AssertionError("Expected NullPointerException from onFlush(null");

    56            } catch (NullPointerException npe) {

    57                // OK; as expected

    58            }

    59         }

    60      }

    61 

    62     private static void testNoEvent() throws Exception {

    63         CountDownLatch flush = new CountDownLatch(1);

    64         try (RecordingStream r = new RecordingStream()) {

    65             r.onFlush(() -> {

    66                 flush.countDown();

    67             });

    68             r.startAsync();

    69             flush.await();

    70         }

    71     }

    72 

    73     private static void testOneEvent() throws InterruptedException {

    74         CountDownLatch flush = new CountDownLatch(1);

    75         try (RecordingStream r = new RecordingStream()) {

    76             r.onEvent(e -> {

    77                 // ignore event

    78             });

    79             r.onFlush(() -> {

    80                 flush.countDown();

    81             });

    82             r.startAsync();

    83             OneEvent e = new OneEvent();

    84             e.commit();

    85             flush.await();

    86         }

    87     }

    88 }