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Issue 43: poor performance with InflaterDataAccess. Phase 1: test existing code, fix defects found
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 16 Apr 2013 16:59:59 +0200
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children 3c4db86e8c1f
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575
8bf184c9d733 Issue 43: poor performance with InflaterDataAccess. Phase 1: test existing code, fix defects found
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1 /*
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2 * Copyright (c) 2013 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.test;
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18
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19 import java.io.ByteArrayOutputStream;
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20 import java.io.IOException;
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21 import java.nio.ByteBuffer;
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22 import java.util.zip.DeflaterOutputStream;
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23 import java.util.zip.Inflater;
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24
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25 import org.junit.Test;
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26 import org.tmatesoft.hg.internal.ByteArrayDataAccess;
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27 import org.tmatesoft.hg.internal.DataAccess;
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28 import org.tmatesoft.hg.internal.InflaterDataAccess;
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29
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30 /**
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31 *
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32 * @author Artem Tikhomirov
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33 * @author TMate Software Ltd.
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34 */
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35 public class TestInflaterDataAccess {
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36 private final ErrorCollectorExt errorCollector = new ErrorCollectorExt();
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37
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38 private final byte[] testContent1 = "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.".getBytes();
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39
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40 private DataAccess zip(byte[] source) throws IOException {
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41 ByteArrayOutputStream bos = new ByteArrayOutputStream();
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42 DeflaterOutputStream dos = new DeflaterOutputStream(bos);
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43 dos.write(source);
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44 dos.flush();
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45 dos.close();
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46 return new ByteArrayDataAccess(bos.toByteArray());
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47 }
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48
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49 @Test
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50 public void testSeek() throws Exception {
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51 DataAccess zip = zip(testContent1);
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52 InflaterDataAccess ida = new InflaterDataAccess(zip, 0, zip.length(), -1, new Inflater(), new byte[25]);
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53 ida.seek(20);
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54 final int bufferCapacity = 10;
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55 ByteBuffer chunk1 = ByteBuffer.allocate(bufferCapacity);
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56 ida.readBytes(chunk1);
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57 errorCollector.assertTrue(new ByteArraySlice(testContent1, 20, bufferCapacity).equalsTo(chunk1.array()));
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58 ida.skip(-bufferCapacity);
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59 ByteBuffer chunk2 = ByteBuffer.allocate(bufferCapacity);
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60 ida.readBytes(chunk2);
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61 errorCollector.assertEquals(chunk1, chunk2);
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62 }
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63
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64 @Test
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65 public void testLength() throws Exception {
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66 DataAccess zip = zip(testContent1);
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67 InflaterDataAccess ida = new InflaterDataAccess(zip, 0, zip.length(), -1, new Inflater(), new byte[25]);
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68 errorCollector.assertEquals("Plain #length()", testContent1.length, ida.length());
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69 //
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70 ida = new InflaterDataAccess(zip, 0, zip.length(), -1, new Inflater(), new byte[25]);
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71 byte[] dummy = new byte[30];
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72 ida.readBytes(dummy, 0, dummy.length);
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73 int lll = ida.length();
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74 errorCollector.assertEquals("#length() after readBytes()", testContent1.length, ida.length());
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75 //
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76 ida = new InflaterDataAccess(zip, 0, zip.length(), -1, new Inflater(), new byte[25]);
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77 // consume most of the stream, so that all original compressed data is already read
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78 ida.readBytes(ByteBuffer.allocate(testContent1.length - 1));
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79 errorCollector.assertEquals("#length() after origin was completely read", testContent1.length, ida.length());
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80 }
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81
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82 @Test
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83 public void testReadBytes() throws Exception {
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84 DataAccess zip = zip(testContent1);
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85 InflaterDataAccess ida = new InflaterDataAccess(zip, 0, zip.length(), -1, new Inflater(), new byte[25]);
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86 ida.skip(10);
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87 byte[] chunk1 = new byte[22];
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88 ida.readBytes(chunk1, 0, 20);
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89 chunk1[20] = ida.readByte();
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90 chunk1[21] = ida.readByte();
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91 ida.skip(5);
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92 byte[] chunk2 = new byte[12];
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93 chunk2[0] = ida.readByte();
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94 chunk2[1] = ida.readByte();
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95 ida.readBytes(chunk2, 2, 10);
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96 errorCollector.assertTrue(new ByteArraySlice(testContent1, 10, 22).equalsTo(chunk1));
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97 errorCollector.assertTrue(new ByteArraySlice(testContent1, 10+22+5, 12).equalsTo(chunk2));
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98 }
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99
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100 private static class ByteArraySlice {
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101 public final byte[] array;
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102 public final int offset, length;
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103
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104 public ByteArraySlice(byte[] array, int offset, int length) {
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105 this.array = array;
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106 this.offset = offset;
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107 this.length = length;
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108 }
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109
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110 public boolean equalsTo(byte[] another) {
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111 if (another == null || another.length != length) {
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112 return false;
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113 }
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parents:
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114 for (int i = 0; i < length; i++) {
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parents:
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115 if (array[offset + i] != another[i]) {
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parents:
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116 return false;
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117 }
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118 }
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parents:
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119 return true;
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120 }
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121 }
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122 }