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annotate src/org/tmatesoft/hg/internal/RevlogStream.java @ 196:e2115da4cf6a

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Pool objects to avoid memory polution with duplicates
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Mon, 18 Apr 2011 18:04:24 +0200
parents 71ddbf8603e8
children 33a7d76f067b
rev   line source
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1 /*
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2 * Copyright (c) 2010-2011 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.internal;
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19 import static org.tmatesoft.hg.repo.HgRepository.BAD_REVISION;
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20 import static org.tmatesoft.hg.repo.HgRepository.TIP;
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21
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22 import java.io.File;
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23 import java.io.IOException;
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24 import java.util.ArrayList;
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25 import java.util.Collections;
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26 import java.util.LinkedList;
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27 import java.util.List;
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29 import org.tmatesoft.hg.core.HgBadStateException;
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30 import org.tmatesoft.hg.core.Nodeid;
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31 import org.tmatesoft.hg.repo.HgRepository;
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34 /**
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35 * ? Single RevlogStream per file per repository with accessor to record access session (e.g. with back/forward operations),
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36 * or numerous RevlogStream with separate representation of the underlaying data (cached, lazy ChunkStream)?
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37 *
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38 * @see http://mercurial.selenic.com/wiki/Revlog
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39 * @see http://mercurial.selenic.com/wiki/RevlogNG
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40 *
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41 * @author Artem Tikhomirov
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42 * @author TMate Software Ltd.
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43 */
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44 public class RevlogStream {
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45
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46 private List<IndexEntry> index; // indexed access highly needed
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47 private boolean inline = false;
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48 private final File indexFile;
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49 private final DataAccessProvider dataAccess;
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50
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51 // if we need anything else from HgRepo, might replace DAP parameter with HgRepo and query it for DAP.
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52 public RevlogStream(DataAccessProvider dap, File indexFile) {
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53 this.dataAccess = dap;
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54 this.indexFile = indexFile;
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55 }
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56
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57 /*package*/ DataAccess getIndexStream() {
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58 return dataAccess.create(indexFile);
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59 }
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61 /*package*/ DataAccess getDataStream() {
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62 final String indexName = indexFile.getName();
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63 File dataFile = new File(indexFile.getParentFile(), indexName.substring(0, indexName.length() - 1) + "d");
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64 return dataAccess.create(dataFile);
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65 }
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66
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67 public int revisionCount() {
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68 initOutline();
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69 return index.size();
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70 }
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71
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72 public int dataLength(int revision) {
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73 // XXX in fact, use of iterate() instead of this implementation may be quite reasonable.
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74 //
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75 final int indexSize = revisionCount();
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76 DataAccess daIndex = getIndexStream(); // XXX may supply a hint that I'll need really few bytes of data (although at some offset)
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77 if (revision == TIP) {
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78 revision = indexSize - 1;
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79 }
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80 try {
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81 int recordOffset = inline ? index.get(revision).getIntOffset() : revision * REVLOGV1_RECORD_SIZE;
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82 daIndex.seek(recordOffset + 12); // 6+2+4
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83 int actualLen = daIndex.readInt();
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84 return actualLen;
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85 } catch (IOException ex) {
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86 ex.printStackTrace(); // log error. FIXME better handling
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87 throw new IllegalStateException(ex);
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88 } finally {
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89 daIndex.done();
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90 }
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91 }
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92
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93 public byte[] nodeid(int revision) {
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94 final int indexSize = revisionCount();
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95 if (revision == TIP) {
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96 revision = indexSize - 1;
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97 }
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98 if (revision < 0 || revision >= indexSize) {
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99 throw new IllegalArgumentException(Integer.toString(revision));
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100 }
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101 DataAccess daIndex = getIndexStream();
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102 try {
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103 int recordOffset = inline ? index.get(revision).getIntOffset() : revision * REVLOGV1_RECORD_SIZE;
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104 daIndex.seek(recordOffset + 32);
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105 byte[] rv = new byte[20];
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106 daIndex.readBytes(rv, 0, 20);
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107 return rv;
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108 } catch (IOException ex) {
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109 ex.printStackTrace();
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110 throw new IllegalStateException();
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111 } finally {
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112 daIndex.done();
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113 }
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114 }
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115
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116 public int linkRevision(int revision) {
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117 final int last = revisionCount() - 1;
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118 if (revision == TIP) {
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119 revision = last;
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120 }
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121 if (revision < 0 || revision > last) {
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122 throw new IllegalArgumentException(Integer.toString(revision));
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123 }
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124 DataAccess daIndex = getIndexStream();
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125 try {
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126 int recordOffset = inline ? index.get(revision).getIntOffset() : revision * REVLOGV1_RECORD_SIZE;
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127 daIndex.seek(recordOffset + 20);
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128 int linkRev = daIndex.readInt();
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129 return linkRev;
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130 } catch (IOException ex) {
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131 ex.printStackTrace();
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132 throw new IllegalStateException();
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133 } finally {
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134 daIndex.done();
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135 }
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136 }
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137
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138 // Perhaps, RevlogStream should be limited to use of plain int revisions for access,
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139 // while Nodeids should be kept on the level up, in Revlog. Guess, Revlog better keep
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140 // map of nodeids, and once this comes true, we may get rid of this method.
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141 // Unlike its counterpart, {@link Revlog#getLocalRevisionNumber()}, doesn't fail with exception if node not found,
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142 /**
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143 * @return integer in [0..revisionCount()) or {@link HgRepository#BAD_REVISION} if not found
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144 */
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145 public int findLocalRevisionNumber(Nodeid nodeid) {
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146 // XXX this one may be implemented with iterate() once there's mechanism to stop iterations
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147 final int indexSize = revisionCount();
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148 DataAccess daIndex = getIndexStream();
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149 try {
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150 byte[] nodeidBuf = new byte[20];
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151 for (int i = 0; i < indexSize; i++) {
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152 daIndex.skip(8);
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153 int compressedLen = daIndex.readInt();
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154 daIndex.skip(20);
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155 daIndex.readBytes(nodeidBuf, 0, 20);
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156 if (nodeid.equalsTo(nodeidBuf)) {
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157 return i;
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158 }
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159 daIndex.skip(inline ? 12 + compressedLen : 12);
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160 }
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161 } catch (IOException ex) {
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162 ex.printStackTrace(); // log error. FIXME better handling
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163 throw new IllegalStateException(ex);
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164 } finally {
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165 daIndex.done();
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166 }
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167 return BAD_REVISION;
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168 }
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169
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170
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171 private final int REVLOGV1_RECORD_SIZE = 64;
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172
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173 // should be possible to use TIP, ALL, or -1, -2, -n notation of Hg
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174 // ? boolean needsNodeid
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175 public void iterate(int start, int end, boolean needData, Inspector inspector) {
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176 initOutline();
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177 final int indexSize = index.size();
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178 if (indexSize == 0) {
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179 return;
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180 }
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181 if (end == TIP) {
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182 end = indexSize - 1;
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183 }
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184 if (start == TIP) {
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185 start = indexSize - 1;
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186 }
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187 if (start < 0 || start >= indexSize) {
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188 throw new IllegalArgumentException(String.format("Bad left range boundary %d in [0..%d]", start, indexSize-1));
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189 }
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190 if (end < start || end >= indexSize) {
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191 throw new IllegalArgumentException(String.format("Bad right range boundary %d in [0..%d]", end, indexSize-1));
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192 }
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193 // XXX may cache [start .. end] from index with a single read (pre-read)
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194
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195 DataAccess daIndex = null, daData = null;
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196 daIndex = getIndexStream();
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197 if (needData && !inline) {
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198 daData = getDataStream();
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199 }
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200 try {
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201 byte[] nodeidBuf = new byte[20];
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202 DataAccess lastUserData = null;
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203 int i;
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204 boolean extraReadsToBaseRev = false;
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205 if (needData && index.get(start).baseRevision < start) {
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206 i = index.get(start).baseRevision;
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207 extraReadsToBaseRev = true;
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208 } else {
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209 i = start;
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210 }
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211
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212 daIndex.seek(inline ? index.get(i).getIntOffset() : i * REVLOGV1_RECORD_SIZE);
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213 for (; i <= end; i++ ) {
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214 if (inline && needData) {
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215 // inspector reading data (though FilterDataAccess) may have affected index position
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216 daIndex.seek(index.get(i).getIntOffset());
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217 }
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218 long l = daIndex.readLong(); // 0
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219 @SuppressWarnings("unused")
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220 long offset = l >>> 16;
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221 @SuppressWarnings("unused")
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222 int flags = (int) (l & 0X0FFFF);
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223 int compressedLen = daIndex.readInt(); // +8
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224 int actualLen = daIndex.readInt(); // +12
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225 int baseRevision = daIndex.readInt(); // +16
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226 int linkRevision = daIndex.readInt(); // +20
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227 int parent1Revision = daIndex.readInt();
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228 int parent2Revision = daIndex.readInt();
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229 // Hg has 32 bytes here, uses 20 for nodeid, and keeps 12 last bytes empty
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230 daIndex.readBytes(nodeidBuf, 0, 20); // +32
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231 daIndex.skip(12);
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232 DataAccess userDataAccess = null;
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233 if (needData) {
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234 final byte firstByte;
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235 int streamOffset = index.get(i).getIntOffset();
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236 DataAccess streamDataAccess;
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237 if (inline) {
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238 streamDataAccess = daIndex;
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239 streamOffset += REVLOGV1_RECORD_SIZE; // don't need to do seek as it's actual position in the index stream
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240 } else {
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241 streamDataAccess = daData;
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242 daData.seek(streamOffset);
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243 }
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244 final boolean patchToPrevious = baseRevision != i; // the only way I found to tell if it's a patch
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245 firstByte = streamDataAccess.readByte();
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246 if (firstByte == 0x78 /* 'x' */) {
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247 userDataAccess = new InflaterDataAccess(streamDataAccess, streamOffset, compressedLen, patchToPrevious ? -1 : actualLen);
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248 } else if (firstByte == 0x75 /* 'u' */) {
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249 userDataAccess = new FilterDataAccess(streamDataAccess, streamOffset+1, compressedLen-1);
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250 } else {
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251 // XXX Python impl in fact throws exception when there's not 'x', 'u' or '0'
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252 // but I don't see reason not to return data as is
51
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253 userDataAccess = new FilterDataAccess(streamDataAccess, streamOffset, compressedLen);
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254 }
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255 // XXX
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256 if (patchToPrevious) {
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257 // this is a patch
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258 LinkedList<PatchRecord> patches = new LinkedList<PatchRecord>();
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259 while (!userDataAccess.isEmpty()) {
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260 PatchRecord pr = PatchRecord.read(userDataAccess);
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261 // System.out.printf("PatchRecord:%d %d %d\n", pr.start, pr.end, pr.len);
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262 patches.add(pr);
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263 }
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264 userDataAccess.done();
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265 //
51
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266 byte[] userData = apply(lastUserData, actualLen, patches);
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267 userDataAccess = new ByteArrayDataAccess(userData);
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268 }
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269 } else {
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270 if (inline) {
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271 daIndex.skip(compressedLen);
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272 }
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273 }
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274 if (!extraReadsToBaseRev || i >= start) {
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275 inspector.next(i, actualLen, baseRevision, linkRevision, parent1Revision, parent2Revision, nodeidBuf, userDataAccess);
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276 }
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277 if (userDataAccess != null) {
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278 userDataAccess.reset();
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279 if (lastUserData != null) {
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280 lastUserData.done();
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281 }
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282 lastUserData = userDataAccess;
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283 }
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284 }
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285 } catch (IOException ex) {
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286 throw new HgBadStateException(ex); // FIXME need better handling
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287 } finally {
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288 daIndex.done();
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289 if (daData != null) {
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290 daData.done();
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291 }
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292 }
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293 }
0
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294
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295 private void initOutline() {
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296 if (index != null && !index.isEmpty()) {
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297 return;
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298 }
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299 ArrayList<IndexEntry> res = new ArrayList<IndexEntry>();
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300 DataAccess da = getIndexStream();
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301 try {
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302 int versionField = da.readInt();
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303 da.readInt(); // just to skip next 4 bytes of offset + flags
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304 final int INLINEDATA = 1 << 16;
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305 inline = (versionField & INLINEDATA) != 0;
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306 long offset = 0; // first offset is always 0, thus Hg uses it for other purposes
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307 while(true) {
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308 int compressedLen = da.readInt();
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309 // 8+4 = 12 bytes total read here
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310 @SuppressWarnings("unused")
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311 int actualLen = da.readInt();
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312 int baseRevision = da.readInt();
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313 // 12 + 8 = 20 bytes read here
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314 // int linkRevision = di.readInt();
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315 // int parent1Revision = di.readInt();
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316 // int parent2Revision = di.readInt();
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317 // byte[] nodeid = new byte[32];
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318 if (inline) {
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319 res.add(new IndexEntry(offset + REVLOGV1_RECORD_SIZE * res.size(), baseRevision));
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320 da.skip(3*4 + 32 + compressedLen); // Check: 44 (skip) + 20 (read) = 64 (total RevlogNG record size)
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321 } else {
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322 res.add(new IndexEntry(offset, baseRevision));
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323 da.skip(3*4 + 32);
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324 }
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325 if (da.isEmpty()) {
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326 // fine, done then
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327 res.trimToSize();
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328 index = res;
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329 break;
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330 } else {
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331 // start reading next record
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332 long l = da.readLong();
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333 offset = l >>> 16;
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334 }
2
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335 }
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336 } catch (IOException ex) {
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337 ex.printStackTrace(); // log error
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338 // too bad, no outline then.
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339 index = Collections.emptyList();
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340 } finally {
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341 da.done();
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342 }
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343
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344 }
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345
2
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346
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347 // perhaps, package-local or protected, if anyone else from low-level needs them
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348 // XXX think over if we should keep offset in case of separate data file - we read the field anyway. Perhaps, distinct entry classes for Inline and non-inline indexes?
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349 private static class IndexEntry {
158
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350 private final int/*long*/ offset; // for separate .i and .d - copy of index record entry, for inline index - actual offset of the record in the .i file (record entry + revision * record size))
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351 //public final int length; // data past fixed record (need to decide whether including header size or not), and whether length is of compressed data or not
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352 public final int baseRevision;
2
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353
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354 public IndexEntry(long o, int baseRev) {
158
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355 offset = (int) o;
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356 // Index file stores offsets as long, but since DataAccess doesn't support long length() and others yet,
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357 // no reason to operate with long offsets
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358 if (o != offset) {
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359 throw new HgBadStateException("Data too big, offset didn't fit to sizeof(int)");
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360 }
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361 baseRevision = baseRev;
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362 }
158
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363
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364 public int getIntOffset() {
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365 return offset;
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366 }
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367 }
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368
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369 // mpatch.c : apply()
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370 // FIXME need to implement patch merge (fold, combine, gather and discard from aforementioned mpatch.[c|py]), also see Revlog and Mercurial PDF
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371 public/*for HgBundle; until moved to better place*/static byte[] apply(DataAccess baseRevisionContent, int outcomeLen, List<PatchRecord> patch) throws IOException {
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372 int last = 0, destIndex = 0;
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373 if (outcomeLen == -1) {
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374 outcomeLen = baseRevisionContent.length();
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375 for (PatchRecord pr : patch) {
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376 outcomeLen += pr.start - last + pr.len;
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377 last = pr.end;
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378 }
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379 outcomeLen -= last;
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380 last = 0;
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381 }
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382 byte[] rv = new byte[outcomeLen];
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383 for (PatchRecord pr : patch) {
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384 baseRevisionContent.seek(last);
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385 baseRevisionContent.readBytes(rv, destIndex, pr.start-last);
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386 destIndex += pr.start - last;
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387 System.arraycopy(pr.data, 0, rv, destIndex, pr.data.length);
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388 destIndex += pr.data.length;
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389 last = pr.end;
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390 }
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391 baseRevisionContent.seek(last);
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392 baseRevisionContent.readBytes(rv, destIndex, (int) (baseRevisionContent.length() - last));
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393 return rv;
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394 }
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395
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396 // @see http://mercurial.selenic.com/wiki/BundleFormat, in Changelog group description
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397 public static class PatchRecord {
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398 /*
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399 Given there are pr1 and pr2:
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400 pr1.start to pr1.end will be replaced with pr's data (of pr1.len)
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401 pr1.end to pr2.start gets copied from base
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402 */
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403 public int start, end, len;
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404 public byte[] data;
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405
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406 // TODO consider PatchRecord that only records data position (absolute in data source), and acquires data as needed
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407 private PatchRecord(int p1, int p2, int length, byte[] src) {
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408 start = p1;
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409 end = p2;
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410 len = length;
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411 data = src;
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412 }
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413
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414 /*package-local*/ static PatchRecord read(byte[] data, int offset) {
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415 final int x = offset; // shorthand
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416 int p1 = ((data[x] & 0xFF)<< 24) | ((data[x+1] & 0xFF) << 16) | ((data[x+2] & 0xFF) << 8) | (data[x+3] & 0xFF);
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417 int p2 = ((data[x+4] & 0xFF) << 24) | ((data[x+5] & 0xFF) << 16) | ((data[x+6] & 0xFF) << 8) | (data[x+7] & 0xFF);
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418 int len = ((data[x+8] & 0xFF) << 24) | ((data[x+9] & 0xFF) << 16) | ((data[x+10] & 0xFF) << 8) | (data[x+11] & 0xFF);
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419 byte[] dataCopy = new byte[len];
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420 System.arraycopy(data, x+12, dataCopy, 0, len);
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421 return new PatchRecord(p1, p2, len, dataCopy);
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422 }
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423
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424 public /*for HgBundle*/ static PatchRecord read(DataAccess da) throws IOException {
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425 int p1 = da.readInt();
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426 int p2 = da.readInt();
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427 int len = da.readInt();
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428 byte[] src = new byte[len];
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429 da.readBytes(src, 0, len);
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430 return new PatchRecord(p1, p2, len, src);
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431 }
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432 }
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433
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434 // FIXME byte[] data might be too expensive, for few usecases it may be better to have intermediate Access object (when we don't need full data
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435 // instantly - e.g. calculate hash, or comparing two revisions
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436 public interface Inspector {
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437 // XXX boolean retVal to indicate whether to continue?
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438 // TODO specify nodeid and data length, and reuse policy (i.e. if revlog stream doesn't reuse nodeid[] for each call)
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439 // implementers shall not invoke DataAccess.done(), it's accomplished by #iterate at appropraite moment
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440 void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[/*20*/] nodeid, DataAccess data);
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441 }
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442 }