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.event.io;

    27 

    28 import static jdk.test.lib.Asserts.assertEquals;

    29 

    30 import java.io.File;

    31 import java.io.RandomAccessFile;

    32 import java.time.Duration;

    33 import java.util.ArrayList;

    34 import java.util.List;

    35 

    36 import jdk.jfr.Recording;

    37 import jdk.jfr.consumer.RecordedEvent;

    38 import jdk.test.lib.jfr.Events;

    39 

    40 /*

    41  * @test

    42  * @key jfr

    43  * @library /test/lib /test/jdk

    44  * @run main/othervm jdk.jfr.event.io.TestRandomAccessFileEvents

    45  */

    46 public class TestRandomAccessFileEvents {

    47 

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

    49         File tmp = File.createTempFile("TestRandomAccessFileEvents", ".tmp", new File("."));

    50         tmp.deleteOnExit();

    51         Recording recording = new Recording();

    52         List<IOEvent> expectedEvents = new ArrayList<>();

    53 

    54         recording.enable(IOEvent.EVENT_FILE_WRITE).withThreshold(Duration.ofMillis(0));

    55         recording.enable(IOEvent.EVENT_FILE_READ).withThreshold(Duration.ofMillis(0));

    56         recording.start();

    57 

    58         RandomAccessFile ras = new RandomAccessFile(tmp, "rw");

    59         int writeInt = 47;

    60         byte[] writeBuffer = {10,11,12,13};

    61 

    62         // Write an int and a buffer.

    63         ras.write(writeInt);

    64         expectedEvents.add(IOEvent.createFileWriteEvent(1, tmp));

    65         ras.write(writeBuffer);

    66         expectedEvents.add(IOEvent.createFileWriteEvent(writeBuffer.length, tmp));

    67 

    68         ras.seek(0);

    69 

    70         // Read int and buffer

    71         int readInt = ras.read();

    72         assertEquals(readInt, writeInt, "wrong int read");

    73         expectedEvents.add(IOEvent.createFileReadEvent(1, tmp));

    74         byte[] readBuffer = new byte [writeBuffer.length];

    75         int size = ras.read(readBuffer);

    76         verifyBufferEquals(readBuffer, writeBuffer);

    77         expectedEvents.add(IOEvent.createFileReadEvent(readBuffer.length, tmp));

    78 

    79         // Read beyond EOF

    80         readInt = ras.read();

    81         assertEquals(-1, readInt, "wrong read after EOF");

    82         expectedEvents.add(IOEvent.createFileReadEvent(-1, tmp));

    83 

    84         // Seek to beginning and verify we can read after EOF.

    85         ras.seek(0);

    86         readInt = ras.read();

    87         assertEquals(readInt, writeInt, "wrong int read after seek(0)");

    88         expectedEvents.add(IOEvent.createFileReadEvent(1, tmp));

    89 

    90         // seek beyond EOF and verify we get EOF when reading.

    91         ras.seek(10);

    92         readInt = ras.read();

    93         assertEquals(-1, readInt, "wrong read after seek beyond EOF");

    94         expectedEvents.add(IOEvent.createFileReadEvent(-1, tmp));

    95 

    96         // Read partial buffer.

    97         int partialSize = writeBuffer.length - 2;

    98         ras.seek(ras.length()-partialSize);

    99         size = ras.read(readBuffer);

   100         assertEquals(size, partialSize, "Wrong size partial buffer read");

   101         expectedEvents.add(IOEvent.createFileReadEvent(size, tmp));

   102 

   103         ras.close();

   104         recording.stop();

   105         List<RecordedEvent> events = Events.fromRecording(recording);

   106         IOHelper.verifyEqualsInOrder(events, expectedEvents);

   107     }

   108 

   109     private static void verifyBufferEquals(byte[] a, byte[] b) {

   110         assertEquals(a.length, b.length, "Wrong buffer size");

   111         for (int i = 0; i < a.length; ++i) {

   112             assertEquals(a[i], b[i], "Wrong buffer content at pos " + i);

   113         }

   114     }

   115 }