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.filestream;

    27 

    28 import java.nio.file.Files;

    29 import java.nio.file.Path;

    30 import java.time.Instant;

    31 import java.util.ArrayList;

    32 import java.util.List;

    33 import java.util.concurrent.CyclicBarrier;

    34 import java.util.concurrent.atomic.AtomicBoolean;

    35 import java.util.concurrent.atomic.AtomicReference;

    36 

    37 import jdk.jfr.Event;

    38 import jdk.jfr.Recording;

    39 import jdk.jfr.consumer.EventStream;

    40 

    41 /**

    42  * @test

    43  * @summary Test EventStream::setOrdered(...)

    44  * @key jfr

    45  * @requires vm.hasJFR

    46  * @library /test/lib

    47  * @run main/othervm jdk.jfr.api.consumer.filestream.TestOrdered

    48  */

    49 public class TestOrdered {

    50 

    51     static class OrderedEvent extends Event {

    52     }

    53 

    54     static class Emitter extends Thread {

    55         private final CyclicBarrier barrier;

    56 

    57         public Emitter(CyclicBarrier barrier) {

    58             this.barrier = barrier;

    59         }

    60 

    61         @Override

    62         public void run() {

    63             OrderedEvent e1 = new OrderedEvent();

    64             e1.commit();

    65             try {

    66                 barrier.await();

    67             } catch (Exception e) {

    68                 e.printStackTrace();

    69                 throw new Error("Unexpected exception in barrier");

    70             }

    71             OrderedEvent e2 = new OrderedEvent();

    72             e2.commit();

    73         }

    74     }

    75 

    76     private static final int THREAD_COUNT = 4;

    77     private static final boolean[] BOOLEAN_STATES = { false, true };

    78 

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

    80         Path p = makeUnorderedRecording();

    81 

    82         testSetOrderedTrue(p);

    83         testSetOrderedFalse(p);

    84     }

    85 

    86     private static void testSetOrderedTrue(Path p) throws Exception {

    87         for (boolean reuse : BOOLEAN_STATES) {

    88             AtomicReference<Instant> timestamp = new AtomicReference<>(Instant.MIN);

    89             try (EventStream es = EventStream.openFile(p)) {

    90                 es.setReuse(reuse);

    91                 es.setOrdered(true);

    92                 es.onEvent(e -> {

    93                     Instant endTime = e.getEndTime();

    94                     if (endTime.isBefore(timestamp.get())) {

    95                         throw new Error("Events are not ordered! Reuse = " + reuse);

    96                     }

    97                     timestamp.set(endTime);

    98                 });

    99                 es.start();

   100             }

   101         }

   102     }

   103 

   104     private static void testSetOrderedFalse(Path p) throws Exception {

   105         for (boolean reuse : BOOLEAN_STATES) {

   106             AtomicReference<Instant> timestamp = new AtomicReference<>(Instant.MIN);

   107             AtomicBoolean unoreded = new AtomicBoolean(false);

   108             try (EventStream es = EventStream.openFile(p)) {

   109                 es.setReuse(reuse);

   110                 es.setOrdered(false);

   111                 es.onEvent(e -> {

   112                     Instant endTime = e.getEndTime();

   113                     if (endTime.isBefore(timestamp.get())) {

   114                         unoreded.set(true);

   115                         es.close();

   116                     }

   117                     timestamp.set(endTime);

   118                 });

   119                 es.start();

   120                 if (!unoreded.get()) {

   121                     throw new Exception("Expected at least some events to be out of order! Reuse = " + reuse);

   122                 }

   123             }

   124         }

   125     }

   126 

   127     private static Path makeUnorderedRecording() throws Exception {

   128         CyclicBarrier barrier = new CyclicBarrier(THREAD_COUNT + 1);

   129 

   130         try (Recording r = new Recording()) {

   131             r.start();

   132             List<Emitter> emitters = new ArrayList<>();

   133             for (int i = 0; i < THREAD_COUNT; i++) {

   134                 Emitter e = new Emitter(barrier);

   135                 e.start();

   136                 emitters.add(e);

   137             }

   138             // Thread buffers should now have one event each

   139             barrier.await();

   140             // Add another event to each thread buffer, so

   141             // events are bound to come out of order when they

   142             // are flushed

   143             for (Emitter e : emitters) {

   144                 e.join();

   145             }

   146             r.stop();

   147             Path p = Files.createTempFile("recording", ".jfr");

   148             r.dump(p);

   149             return p;

   150         }

   151     }

   152 }