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.consumer;

    27 

    28 import java.nio.file.Files;

    29 import java.nio.file.Path;

    30 import java.util.LinkedList;

    31 import java.util.List;

    32 

    33 import jdk.jfr.Event;

    34 import jdk.jfr.Recording;

    35 import jdk.jfr.consumer.RecordedEvent;

    36 import jdk.jfr.consumer.RecordingFile;

    37 import jdk.test.lib.Asserts;

    38 

    39 

    40 /*

    41  * @test

    42  * @summary Reads the recorded file two times and verifies that both reads are the same

    43  * @key jfr

    44  * @library /test/lib

    45  * @run main/othervm jdk.jfr.api.consumer.TestReadTwice

    46  */

    47 public class TestReadTwice {

    48 

    49     private static class MyEvent extends Event {

    50     }

    51 

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

    53         Recording r = new Recording();

    54         r.enable(MyEvent.class).withoutStackTrace();

    55         r.start();

    56 

    57         // Commit a single event to the recording

    58         MyEvent event = new MyEvent();

    59         event.commit();

    60 

    61         r.stop();

    62 

    63         // Dump the recording to a file

    64         Path path = Files.createTempFile("recording", ".jfr");

    65         System.out.println("Dumping to " + path);

    66         r.dump(path);

    67         r.close();

    68 

    69         // Read all events from the file in one go

    70         List<RecordedEvent> events = RecordingFile.readAllEvents(path);

    71 

    72         // Read again the same events one by one

    73         RecordingFile rfile = new RecordingFile(path);

    74         List<RecordedEvent> events2 = new LinkedList<>();

    75         while (rfile.hasMoreEvents()) {

    76             events2.add(rfile.readEvent());

    77         }

    78 

    79         // Compare sizes

    80         Asserts.assertEquals(events.size(), events2.size());

    81         rfile.close();

    82     }

    83 }