Mercurial > hg4j

annotate src/org/tmatesoft/hg/internal/RevlogStream.java @ 283:7a8e1a305a78

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Ignored tests shall be valid tests nevertheless
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Sat, 03 Sep 2011 13:10:12 +0200
parents 35125450c804
children b11f6a08f748
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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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18
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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.List;
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26 import java.util.zip.Inflater;
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27
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28 import org.tmatesoft.hg.core.HgBadStateException;
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29 import org.tmatesoft.hg.core.Nodeid;
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30 import org.tmatesoft.hg.repo.HgRepository;
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33 /**
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34 * ? Single RevlogStream per file per repository with accessor to record access session (e.g. with back/forward operations),
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35 * or numerous RevlogStream with separate representation of the underlying data (cached, lazy ChunkStream)?
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36 *
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37 * @see http://mercurial.selenic.com/wiki/Revlog
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38 * @see http://mercurial.selenic.com/wiki/RevlogNG
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39 *
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40 * @author Artem Tikhomirov
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41 * @author TMate Software Ltd.
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42 */
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43 public class RevlogStream {
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44
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45 /*
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46 * makes sense for index with inline data only - actual offset of the record in the .i file (record entry + revision * record size))
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47 *
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48 * long[] in fact (there are 8-bytes field in the revlog)
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49 * However, (a) DataAccess currently doesn't operate with long seek/length
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50 * and, of greater significance, (b) files with inlined data are designated for smaller files,
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51 * guess, about 130 Kb, and offset there won't ever break int capacity
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52 */
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53 private int[] indexRecordOffset;
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54 private int[] baseRevisions;
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55 private boolean inline = false;
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56 private final File indexFile;
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57 private final DataAccessProvider dataAccess;
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58
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59 // if we need anything else from HgRepo, might replace DAP parameter with HgRepo and query it for DAP.
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60 public RevlogStream(DataAccessProvider dap, File indexFile) {
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61 this.dataAccess = dap;
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62 this.indexFile = indexFile;
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63 }
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65 /*package*/ DataAccess getIndexStream() {
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66 // XXX may supply a hint that I'll need really few bytes of data (perhaps, at some offset)
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67 // to avoid mmap files when only few bytes are to be read (i.e. #dataLength())
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68 return dataAccess.create(indexFile);
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69 }
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71 /*package*/ DataAccess getDataStream() {
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72 final String indexName = indexFile.getName();
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73 File dataFile = new File(indexFile.getParentFile(), indexName.substring(0, indexName.length() - 1) + "d");
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74 return dataAccess.create(dataFile);
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75 }
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77 public int revisionCount() {
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78 initOutline();
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79 return baseRevisions.length;
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80 }
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81
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82 public int dataLength(int revision) {
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83 // XXX in fact, use of iterate() instead of this implementation may be quite reasonable.
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84 //
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85 final int indexSize = revisionCount();
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86 DataAccess daIndex = getIndexStream();
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87 if (revision == TIP) {
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88 revision = indexSize - 1;
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89 }
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90 try {
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91 int recordOffset = getIndexOffsetInt(revision);
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92 daIndex.seek(recordOffset + 12); // 6+2+4
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93 int actualLen = daIndex.readInt();
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94 return actualLen;
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95 } catch (IOException ex) {
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96 ex.printStackTrace(); // log error. FIXME better handling
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97 throw new IllegalStateException(ex);
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98 } finally {
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99 daIndex.done();
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100 }
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101 }
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102
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103 public byte[] nodeid(int revision) {
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104 final int indexSize = revisionCount();
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105 if (revision == TIP) {
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106 revision = indexSize - 1;
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107 }
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108 if (revision < 0 || revision >= indexSize) {
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109 throw new IllegalArgumentException(Integer.toString(revision));
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110 }
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111 DataAccess daIndex = getIndexStream();
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112 try {
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113 int recordOffset = getIndexOffsetInt(revision);
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114 daIndex.seek(recordOffset + 32);
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115 byte[] rv = new byte[20];
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116 daIndex.readBytes(rv, 0, 20);
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117 return rv;
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118 } catch (IOException ex) {
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119 ex.printStackTrace();
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120 throw new IllegalStateException();
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121 } finally {
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122 daIndex.done();
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123 }
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124 }
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125
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126 public int linkRevision(int revision) {
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127 final int last = revisionCount() - 1;
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128 if (revision == TIP) {
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129 revision = last;
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130 }
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131 if (revision < 0 || revision > last) {
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132 throw new IllegalArgumentException(Integer.toString(revision));
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133 }
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134 DataAccess daIndex = getIndexStream();
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135 try {
198
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136 int recordOffset = getIndexOffsetInt(revision);
88
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137 daIndex.seek(recordOffset + 20);
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138 int linkRev = daIndex.readInt();
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139 return linkRev;
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140 } catch (IOException ex) {
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141 ex.printStackTrace();
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142 throw new IllegalStateException();
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143 } finally {
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144 daIndex.done();
80
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145 }
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146 }
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147
49
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148 // Perhaps, RevlogStream should be limited to use of plain int revisions for access,
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149 // while Nodeids should be kept on the level up, in Revlog. Guess, Revlog better keep
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150 // map of nodeids, and once this comes true, we may get rid of this method.
80
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151 // Unlike its counterpart, {@link Revlog#getLocalRevisionNumber()}, doesn't fail with exception if node not found,
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152 /**
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153 * @return integer in [0..revisionCount()) or {@link HgRepository#BAD_REVISION} if not found
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154 */
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155 public int findLocalRevisionNumber(Nodeid nodeid) {
22
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156 // XXX this one may be implemented with iterate() once there's mechanism to stop iterations
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157 final int indexSize = revisionCount();
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158 DataAccess daIndex = getIndexStream();
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159 try {
24
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160 byte[] nodeidBuf = new byte[20];
22
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161 for (int i = 0; i < indexSize; i++) {
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162 daIndex.skip(8);
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163 int compressedLen = daIndex.readInt();
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164 daIndex.skip(20);
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165 daIndex.readBytes(nodeidBuf, 0, 20);
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166 if (nodeid.equalsTo(nodeidBuf)) {
22
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167 return i;
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168 }
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169 daIndex.skip(inline ? 12 + compressedLen : 12);
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170 }
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171 } catch (IOException ex) {
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172 ex.printStackTrace(); // log error. FIXME better handling. Perhaps, shall return BAD_REVISION here as well?
22
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173 throw new IllegalStateException(ex);
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174 } finally {
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175 daIndex.done();
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176 }
80
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177 return BAD_REVISION;
22
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178 }
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179
2
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180
9
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181 private final int REVLOGV1_RECORD_SIZE = 64;
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182
3
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183 // should be possible to use TIP, ALL, or -1, -2, -n notation of Hg
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184 // ? boolean needsNodeid
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185 public void iterate(int start, int end, boolean needData, Inspector inspector) {
2
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186 initOutline();
198
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187 final int indexSize = revisionCount();
3
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188 if (indexSize == 0) {
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189 return;
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190 }
5
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191 if (end == TIP) {
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192 end = indexSize - 1;
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193 }
5
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194 if (start == TIP) {
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195 start = indexSize - 1;
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196 }
2
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197 if (start < 0 || start >= indexSize) {
157
d5268ca7715b Merged branch wrap-data-access into default for resource-friendly data access. Updated API to promote that friendliness to clients (channels, not byte[]). More exceptions
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diff changeset
198 throw new IllegalArgumentException(String.format("Bad left range boundary %d in [0..%d]", start, indexSize-1));
2
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199 }
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diff changeset
200 if (end < start || end >= indexSize) {
157
d5268ca7715b Merged branch wrap-data-access into default for resource-friendly data access. Updated API to promote that friendliness to clients (channels, not byte[]). More exceptions
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diff changeset
201 throw new IllegalArgumentException(String.format("Bad right range boundary %d in [0..%d]", end, indexSize-1));
2
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diff changeset
202 }
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diff changeset
203 // XXX may cache [start .. end] from index with a single read (pre-read)
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diff changeset
204
242
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diff changeset
205 ReaderN1 r = new ReaderN1(needData, inspector);
2
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diff changeset
206 try {
242
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diff changeset
207 r.start(end - start + 1);
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diff changeset
208 r.range(start, end);
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diff changeset
209 } catch (IOException ex) {
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diff changeset
210 throw new HgBadStateException(ex); // FIXME need better handling
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diff changeset
211 } finally {
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diff changeset
212 r.finish();
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diff changeset
213 }
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diff changeset
214 }
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diff changeset
215
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diff changeset
216 /**
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diff changeset
217 * Effective alternative to {@link #iterate(int, int, boolean, Inspector) batch read}, when only few selected
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diff changeset
218 * revisions are of interest.
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diff changeset
219 * @param sortedRevisions revisions to walk, in ascending order.
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diff changeset
220 * @param needData whether inspector needs access to header only
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diff changeset
221 * @param inspector callback to process entries
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diff changeset
222 */
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diff changeset
223 public void iterate(int[] sortedRevisions, boolean needData, Inspector inspector) {
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diff changeset
224 final int indexSize = revisionCount();
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diff changeset
225 if (indexSize == 0 || sortedRevisions.length == 0) {
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diff changeset
226 return;
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diff changeset
227 }
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diff changeset
228 if (sortedRevisions[0] > indexSize || sortedRevisions[sortedRevisions.length - 1] > indexSize) {
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diff changeset
229 throw new IllegalArgumentException(String.format("Can't iterate [%d, %d] in range [0..%d]", sortedRevisions[0], sortedRevisions[sortedRevisions.length - 1], indexSize));
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diff changeset
230 }
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diff changeset
231
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diff changeset
232 ReaderN1 r = new ReaderN1(needData, inspector);
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diff changeset
233 try {
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diff changeset
234 r.start(sortedRevisions.length);
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diff changeset
235 for (int i = 0; i < sortedRevisions.length; ) {
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diff changeset
236 int x = i;
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diff changeset
237 i++;
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diff changeset
238 while (i < sortedRevisions.length) {
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diff changeset
239 if (sortedRevisions[i] == sortedRevisions[i-1] + 1) {
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diff changeset
240 i++;
2
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diff changeset
241 } else {
217
e39cf474ef94 Experimental support to mix-in start and end events for inspectors. Additionally, Lifecycle may serve as iteration control
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parents: 202
diff changeset
242 break;
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diff changeset
243 }
e39cf474ef94 Experimental support to mix-in start and end events for inspectors. Additionally, Lifecycle may serve as iteration control
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diff changeset
244 }
242
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diff changeset
245 // commitRevisions[x..i-1] are sequential
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diff changeset
246 if (!r.range(sortedRevisions[x], sortedRevisions[i-1])) {
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diff changeset
247 return;
51
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
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diff changeset
248 }
2
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diff changeset
249 }
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diff changeset
250 } catch (IOException ex) {
158
b413b16d10a5 Integer offsets and file length explictly, rather than casts throughout code. Inflater may benefit from total length hint, but shall calculate it by its own if needed
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diff changeset
251 throw new HgBadStateException(ex); // FIXME need better handling
3
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diff changeset
252 } finally {
242
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diff changeset
253 r.finish();
2
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254 }
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255 }
198
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256
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257 private int getBaseRevision(int revision) {
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258 return baseRevisions[revision];
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259 }
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260
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261 /**
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262 * @return offset of the revision's record in the index (.i) stream
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263 */
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264 private int getIndexOffsetInt(int revision) {
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265 return inline ? indexRecordOffset[revision] : revision * REVLOGV1_RECORD_SIZE;
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266 }
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267
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268 private void initOutline() {
198
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269 if (baseRevisions != null && baseRevisions.length > 0) {
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270 return;
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271 }
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272 ArrayList<Integer> resBases = new ArrayList<Integer>();
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273 ArrayList<Integer> resOffsets = new ArrayList<Integer>();
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274 DataAccess da = getIndexStream();
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275 try {
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276 if (da.isEmpty()) {
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277 // do not fail with exception if stream is empty, it's likely intentional
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278 baseRevisions = new int[0];
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279 return;
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280 }
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281 int versionField = da.readInt();
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282 da.readInt(); // just to skip next 4 bytes of offset + flags
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283 final int INLINEDATA = 1 << 16;
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284 inline = (versionField & INLINEDATA) != 0;
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285 long offset = 0; // first offset is always 0, thus Hg uses it for other purposes
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286 while(true) {
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287 int compressedLen = da.readInt();
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288 // 8+4 = 12 bytes total read here
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289 @SuppressWarnings("unused")
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290 int actualLen = da.readInt();
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291 int baseRevision = da.readInt();
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292 // 12 + 8 = 20 bytes read here
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293 // int linkRevision = di.readInt();
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294 // int parent1Revision = di.readInt();
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295 // int parent2Revision = di.readInt();
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296 // byte[] nodeid = new byte[32];
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297 resBases.add(baseRevision);
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298 if (inline) {
198
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299 int o = (int) offset;
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300 if (o != offset) {
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301 // just in case, can't happen, ever, unless HG (or some other bad tool) produces index file
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302 // with inlined data of size greater than 2 Gb.
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303 throw new HgBadStateException("Data too big, offset didn't fit to sizeof(int)");
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304 }
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305 resOffsets.add(o + REVLOGV1_RECORD_SIZE * resOffsets.size());
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306 da.skip(3*4 + 32 + compressedLen); // Check: 44 (skip) + 20 (read) = 64 (total RevlogNG record size)
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307 } else {
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308 da.skip(3*4 + 32);
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309 }
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310 if (da.isEmpty()) {
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311 // fine, done then
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312 baseRevisions = toArray(resBases);
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313 if (inline) {
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314 indexRecordOffset = toArray(resOffsets);
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315 }
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316 break;
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317 } else {
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318 // start reading next record
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319 long l = da.readLong();
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320 offset = l >>> 16;
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321 }
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322 }
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323 } catch (IOException ex) {
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324 ex.printStackTrace(); // log error
198
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325 // too bad, no outline then, but don't fail with NPE
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326 baseRevisions = new int[0];
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327 } finally {
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328 da.done();
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329 }
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330 }
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331
242
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332 /**
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333 * operation with single file open/close and multiple diverse reads.
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334 * XXX initOutline might need similar extraction to keen N1 format knowledge
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335 */
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336 class ReaderN1 {
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337 private final Inspector inspector;
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338 private final boolean needData;
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339 private DataAccess daIndex = null, daData = null;
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340 private Lifecycle.BasicCallback cb = null;
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341 private int lastRevisionRead = BAD_REVISION;
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342 private DataAccess lastUserData;
263
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343 // next are to track two major bottlenecks - patch application and actual time spent in inspector
264
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344 // private long applyTime, inspectorTime; // TIMING
263
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345
242
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346
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347 public ReaderN1(boolean needData, Inspector insp) {
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348 assert insp != null;
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349 this.needData = needData;
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350 inspector = insp;
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351 }
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352
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353 public void start(int totalWork) {
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354 daIndex = getIndexStream();
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355 if (needData && !inline) {
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356 daData = getDataStream();
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357 }
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358 if (inspector instanceof Lifecycle) {
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359 cb = new Lifecycle.BasicCallback();
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360 ((Lifecycle) inspector).start(totalWork, cb, cb);
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361 }
264
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362 // applyTime = inspectorTime = 0; // TIMING
242
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363 }
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364
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365 public void finish() {
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366 if (lastUserData != null) {
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367 lastUserData.done();
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368 lastUserData = null;
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369 }
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370 if (inspector instanceof Lifecycle) {
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371 ((Lifecycle) inspector).finish(cb);
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372 }
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373 daIndex.done();
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374 if (daData != null) {
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375 daData.done();
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376 }
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377 // System.out.printf("applyTime:%d ms, inspectorTime: %d ms\n", applyTime, inspectorTime); // TIMING
242
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378 }
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379
242
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380 public boolean range(int start, int end) throws IOException {
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381 byte[] nodeidBuf = new byte[20];
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382 int i;
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383 boolean extraReadsToBaseRev = false; // to indicate we read revision prior to start. XXX not sure can't do without
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384 // it (i.e. replace with i >= start)
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385 if (needData && (i = getBaseRevision(start)) < start) {
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386 // if lastRevisionRead in [baseRevision(start), start) can reuse lastUserData
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387 // doesn't make sense to reuse if lastRevisionRead == start (too much to change in the cycle below).
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388 if (lastRevisionRead != BAD_REVISION && i <= lastRevisionRead && lastRevisionRead < start) {
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389 i = lastRevisionRead + 1; // start with first not-yet-read revision
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390 extraReadsToBaseRev = i < start;
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391 } else {
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392 if (lastUserData != null) {
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393 lastUserData.done();
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394 lastUserData = null;
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395 }
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396 extraReadsToBaseRev = true;
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397 }
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398 } else {
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399 // don't need to clean lastUserData as it's always null when !needData
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400 i = start;
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401 }
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402
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403 daIndex.seek(getIndexOffsetInt(i));
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404 //
263
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405 // reuse some instances
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406 final ArrayList<PatchRecord> patches = new ArrayList<PatchRecord>();
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407 final Inflater inflater = new Inflater();
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408 // can share buffer between instances of InflaterDataAccess as I never read any two of them in parallel
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409 final byte[] inflaterBuffer = new byte[1024];
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410 //
242
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411
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412 for (; i <= end; i++ ) {
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413 if (inline && needData) {
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414 // inspector reading data (though FilterDataAccess) may have affected index position
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415 daIndex.seek(getIndexOffsetInt(i));
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416 }
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417 long l = daIndex.readLong(); // 0
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418 long offset = i == 0 ? 0 : (l >>> 16);
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419 @SuppressWarnings("unused")
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420 int flags = (int) (l & 0X0FFFF);
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421 int compressedLen = daIndex.readInt(); // +8
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422 int actualLen = daIndex.readInt(); // +12
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423 int baseRevision = daIndex.readInt(); // +16
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424 int linkRevision = daIndex.readInt(); // +20
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425 int parent1Revision = daIndex.readInt();
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426 int parent2Revision = daIndex.readInt();
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427 // Hg has 32 bytes here, uses 20 for nodeid, and keeps 12 last bytes empty
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428 daIndex.readBytes(nodeidBuf, 0, 20); // +32
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429 daIndex.skip(12);
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430 DataAccess userDataAccess = null;
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431 if (needData) {
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432 int streamOffset;
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433 DataAccess streamDataAccess;
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434 if (inline) {
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435 streamDataAccess = daIndex;
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436 streamOffset = getIndexOffsetInt(i) + REVLOGV1_RECORD_SIZE; // don't need to do seek as it's actual position in the index stream
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437 } else {
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438 streamOffset = (int) offset;
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439 streamDataAccess = daData;
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440 daData.seek(streamOffset);
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441 }
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442 final boolean patchToPrevious = baseRevision != i; // the only way I found to tell if it's a patch
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443 if (streamDataAccess.isEmpty()) {
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444 userDataAccess = new DataAccess(); // empty
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445 } else {
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446 final byte firstByte = streamDataAccess.readByte();
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447 if (firstByte == 0x78 /* 'x' */) {
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448 inflater.reset();
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449 userDataAccess = new InflaterDataAccess(streamDataAccess, streamOffset, compressedLen, patchToPrevious ? -1 : actualLen, inflater, inflaterBuffer);
242
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450 } else if (firstByte == 0x75 /* 'u' */) {
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451 userDataAccess = new FilterDataAccess(streamDataAccess, streamOffset+1, compressedLen-1);
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452 } else {
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453 // XXX Python impl in fact throws exception when there's not 'x', 'u' or '0'
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454 // but I don't see reason not to return data as is
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455 userDataAccess = new FilterDataAccess(streamDataAccess, streamOffset, compressedLen);
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456 }
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457 }
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458 // XXX
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459 if (patchToPrevious) {
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460 // this is a patch
263
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461 patches.clear(); // won't hurt to ensure there are no leftovers, even if we already cleaned
242
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462 while (!userDataAccess.isEmpty()) {
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463 PatchRecord pr = PatchRecord.read(userDataAccess);
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464 // System.out.printf("PatchRecord:%d %d %d\n", pr.start, pr.end, pr.len);
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465 patches.add(pr);
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466 }
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467 userDataAccess.done();
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468 //
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469 // it shall be reset at the end of prev iteration, when it got assigned from userDataAccess
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470 // however, actual userDataAccess and lastUserData may share Inflater object, which needs to be reset
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471 // Alternatively, userDataAccess.done() above may be responsible to reset Inflater (if it's InflaterDataAccess)
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472 lastUserData.reset();
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473 // final long startMeasuring = System.currentTimeMillis(); // TIMING
242
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474 byte[] userData = apply(lastUserData, actualLen, patches);
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475 // applyTime += (System.currentTimeMillis() - startMeasuring); // TIMING
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476 patches.clear(); // do not keep any reference, allow PatchRecord to be gc'd
242
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477 userDataAccess = new ByteArrayDataAccess(userData);
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478 }
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479 } else {
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480 if (inline) {
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481 daIndex.skip(compressedLen);
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482 }
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483 }
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484 if (!extraReadsToBaseRev || i >= start) {
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485 // final long startMeasuring = System.currentTimeMillis(); // TIMING
242
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486 inspector.next(i, actualLen, baseRevision, linkRevision, parent1Revision, parent2Revision, nodeidBuf, userDataAccess);
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487 // inspectorTime += (System.currentTimeMillis() - startMeasuring); // TIMING
242
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488 }
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489 if (cb != null) {
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490 if (cb.isStopped()) {
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491 return false;
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492 }
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493 }
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494 if (userDataAccess != null) {
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495 userDataAccess.reset(); // not sure this is necessary here, as lastUserData would get reset anyway before next use.
242
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496 }
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497 if (lastUserData != null) {
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498 lastUserData.done();
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499 }
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500 lastUserData = userDataAccess;
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501 }
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502 lastRevisionRead = end;
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503 return true;
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504 }
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parents: 223
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505 }
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parents: 223
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506
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507
198
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
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508 private static int[] toArray(List<Integer> l) {
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509 int[] rv = new int[l.size()];
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510 for (int i = 0; i < rv.length; i++) {
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511 rv[i] = l.get(i);
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parents: 0
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512 }
198
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513 return rv;
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514 }
198
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515
3
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
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516
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517 // mpatch.c : apply()
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518 // 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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519 public/*for HgBundle; until moved to better place*/static byte[] apply(DataAccess baseRevisionContent, int outcomeLen, List<PatchRecord> patch) throws IOException {
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diff changeset
520 int last = 0, destIndex = 0;
43
1b26247d7367 Calculate result length of the patch operarion, when unknown
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521 if (outcomeLen == -1) {
158
b413b16d10a5 Integer offsets and file length explictly, rather than casts throughout code. Inflater may benefit from total length hint, but shall calculate it by its own if needed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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522 outcomeLen = baseRevisionContent.length();
263
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523 for (int i = 0, x = patch.size(); i < x; i++) {
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parents: 258
diff changeset
524 PatchRecord pr = patch.get(i);
43
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525 outcomeLen += pr.start - last + pr.len;
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526 last = pr.end;
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527 }
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528 outcomeLen -= last;
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529 last = 0;
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530 }
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531 byte[] rv = new byte[outcomeLen];
263
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532 for (int i = 0, x = patch.size(); i < x; i++) {
31f67be94e71 RevlogStream - reduce number of object instances, reuse when possible
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parents: 258
diff changeset
533 PatchRecord pr = patch.get(i);
51
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
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534 baseRevisionContent.seek(last);
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parents: 49
diff changeset
535 baseRevisionContent.readBytes(rv, destIndex, pr.start-last);
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parents: 2
diff changeset
536 destIndex += pr.start - last;
43
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parents: 37
diff changeset
537 System.arraycopy(pr.data, 0, rv, destIndex, pr.data.length);
3
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diff changeset
538 destIndex += pr.data.length;
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539 last = pr.end;
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540 }
51
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diff changeset
541 baseRevisionContent.seek(last);
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542 baseRevisionContent.readBytes(rv, destIndex, (int) (baseRevisionContent.length() - last));
3
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parents: 2
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543 return rv;
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544 }
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parents: 2
diff changeset
545
35
6061aa826a9e Complete parsing of the bundle format
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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diff changeset
546 // @see http://mercurial.selenic.com/wiki/BundleFormat, in Changelog group description
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diff changeset
547 public static class PatchRecord {
52
30bd38978846 brief explanation of patch record
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parents: 49
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548 /*
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parents: 49
diff changeset
549 Given there are pr1 and pr2:
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 49
diff changeset
550 pr1.start to pr1.end will be replaced with pr's data (of pr1.len)
30bd38978846 brief explanation of patch record
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parents: 49
diff changeset
551 pr1.end to pr2.start gets copied from base
30bd38978846 brief explanation of patch record
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552 */
77
c677e1593919 Moved RevlogStream implementation into .internal
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diff changeset
553 public int start, end, len;
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 74
diff changeset
554 public byte[] data;
3
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
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parents: 2
diff changeset
555
36
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parents: 35
diff changeset
556 // TODO consider PatchRecord that only records data position (absolute in data source), and acquires data as needed
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diff changeset
557 private PatchRecord(int p1, int p2, int length, byte[] src) {
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parents: 35
diff changeset
558 start = p1;
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diff changeset
559 end = p2;
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diff changeset
560 len = length;
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parents: 35
diff changeset
561 data = src;
3
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diff changeset
562 }
36
205f9b59b400 Strip parsing logic out from console frontend
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diff changeset
563
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 35
diff changeset
564 /*package-local*/ static PatchRecord read(byte[] data, int offset) {
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diff changeset
565 final int x = offset; // shorthand
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parents: 35
diff changeset
566 int p1 = ((data[x] & 0xFF)<< 24) | ((data[x+1] & 0xFF) << 16) | ((data[x+2] & 0xFF) << 8) | (data[x+3] & 0xFF);
205f9b59b400 Strip parsing logic out from console frontend
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parents: 35
diff changeset
567 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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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 35
diff changeset
568 int len = ((data[x+8] & 0xFF) << 24) | ((data[x+9] & 0xFF) << 16) | ((data[x+10] & 0xFF) << 8) | (data[x+11] & 0xFF);
205f9b59b400 Strip parsing logic out from console frontend
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 35
diff changeset
569 byte[] dataCopy = new byte[len];
205f9b59b400 Strip parsing logic out from console frontend
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 35
diff changeset
570 System.arraycopy(data, x+12, dataCopy, 0, len);
205f9b59b400 Strip parsing logic out from console frontend
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parents: 35
diff changeset
571 return new PatchRecord(p1, p2, len, dataCopy);
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parents: 35
diff changeset
572 }
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 35
diff changeset
573
77
c677e1593919 Moved RevlogStream implementation into .internal
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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diff changeset
574 public /*for HgBundle*/ static PatchRecord read(DataAccess da) throws IOException {
36
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parents: 35
diff changeset
575 int p1 = da.readInt();
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parents: 35
diff changeset
576 int p2 = da.readInt();
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 35
diff changeset
577 int len = da.readInt();
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parents: 35
diff changeset
578 byte[] src = new byte[len];
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parents: 35
diff changeset
579 da.readBytes(src, 0, len);
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 35
diff changeset
580 return new PatchRecord(p1, p2, len, src);
205f9b59b400 Strip parsing logic out from console frontend
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 35
diff changeset
581 }
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c677e1593919 Moved RevlogStream implementation into .internal
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 74
diff changeset
582 }
c677e1593919 Moved RevlogStream implementation into .internal
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 74
diff changeset
583
c677e1593919 Moved RevlogStream implementation into .internal
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 74
diff changeset
584 // 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
c677e1593919 Moved RevlogStream implementation into .internal
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 74
diff changeset
585 // instantly - e.g. calculate hash, or comparing two revisions
c677e1593919 Moved RevlogStream implementation into .internal
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 74
diff changeset
586 public interface Inspector {
c677e1593919 Moved RevlogStream implementation into .internal
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 74
diff changeset
587 // XXX boolean retVal to indicate whether to continue?
157
d5268ca7715b Merged branch wrap-data-access into default for resource-friendly data access. Updated API to promote that friendliness to clients (channels, not byte[]). More exceptions
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 53 102
diff changeset
588 // TODO specify nodeid and data length, and reuse policy (i.e. if revlog stream doesn't reuse nodeid[] for each call)
d5268ca7715b Merged branch wrap-data-access into default for resource-friendly data access. Updated API to promote that friendliness to clients (channels, not byte[]). More exceptions
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 53 102
diff changeset
589 // implementers shall not invoke DataAccess.done(), it's accomplished by #iterate at appropraite moment
d5268ca7715b Merged branch wrap-data-access into default for resource-friendly data access. Updated API to promote that friendliness to clients (channels, not byte[]). More exceptions
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 53 102
diff changeset
590 void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[/*20*/] nodeid, DataAccess data);
3
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
591 }
0
dbd663faec1f Basic changelog parsing
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
592 }