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  *
  44  * @library /lib /
  45  * @run main/othervm jdk.jfr.event.io.TestRandomAccessFileEvents
  46  */
  47 public class TestRandomAccessFileEvents {
  48 
  49     public static void main(String[] args) throws Throwable {
  50         File tmp = File.createTempFile("TestRandomAccessFileEvents", ".tmp", new File("."));
  51         tmp.deleteOnExit();
  52         Recording recording = new Recording();
  53         List<IOEvent> expectedEvents = new ArrayList<>();
  54 
  55         recording.enable(IOEvent.EVENT_FILE_WRITE).withThreshold(Duration.ofMillis(0));
  56         recording.enable(IOEvent.EVENT_FILE_READ).withThreshold(Duration.ofMillis(0));
  57         recording.start();
  58 
  59         RandomAccessFile ras = new RandomAccessFile(tmp, "rw");
  60         int writeInt = 47;
  61         byte[] writeBuffer = {10,11,12,13};
  62 
  63         // Write an int and a buffer.
  64         ras.write(writeInt);
  65         expectedEvents.add(IOEvent.createFileWriteEvent(1, tmp));
  66         ras.write(writeBuffer);
  67         expectedEvents.add(IOEvent.createFileWriteEvent(writeBuffer.length, tmp));
  68 
  69         ras.seek(0);
  70 
  71         // Read int and buffer
  72         int readInt = ras.read();
  73         assertEquals(readInt, writeInt, "wrong int read");
  74         expectedEvents.add(IOEvent.createFileReadEvent(1, tmp));
  75         byte[] readBuffer = new byte [writeBuffer.length];
  76         int size = ras.read(readBuffer);
  77         verifyBufferEquals(readBuffer, writeBuffer);
  78         expectedEvents.add(IOEvent.createFileReadEvent(readBuffer.length, tmp));
  79 
  80         // Read beyond EOF
  81         readInt = ras.read();
  82         assertEquals(-1, readInt, "wrong read after EOF");
  83         expectedEvents.add(IOEvent.createFileReadEvent(-1, tmp));
  84 
  85         // Seek to beginning and verify we can read after EOF.
  86         ras.seek(0);
  87         readInt = ras.read();
  88         assertEquals(readInt, writeInt, "wrong int read after seek(0)");
  89         expectedEvents.add(IOEvent.createFileReadEvent(1, tmp));
  90 
  91         // seek beyond EOF and verify we get EOF when reading.
  92         ras.seek(10);
  93         readInt = ras.read();
  94         assertEquals(-1, readInt, "wrong read after seek beyond EOF");
  95         expectedEvents.add(IOEvent.createFileReadEvent(-1, tmp));
  96 
  97         // Read partial buffer.
  98         int partialSize = writeBuffer.length - 2;
  99         ras.seek(ras.length()-partialSize);
 100         size = ras.read(readBuffer);
 101         assertEquals(size, partialSize, "Wrong size partial buffer read");
 102         expectedEvents.add(IOEvent.createFileReadEvent(size, tmp));
 103 
 104         ras.close();
 105         recording.stop();
 106         List<RecordedEvent> events = Events.fromRecording(recording);
 107         IOHelper.verifyEqualsInOrder(events, expectedEvents);
 108     }
 109 
 110     private static void verifyBufferEquals(byte[] a, byte[] b) {
 111         assertEquals(a.length, b.length, "Wrong buffer size");
 112         for (int i = 0; i < a.length; ++i) {
 113             assertEquals(a[i], b[i], "Wrong buffer content at pos " + i);
 114         }
 115     }
 116 }