annotate src/org/tmatesoft/hg/internal/RevlogStream.java @ 534:243202f1bda5

Commit: refactor revision creation code from clone command to work separately, fit into existing library structure
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Mon, 04 Feb 2013 18:00:55 +0100
parents 0f6fa88e2162
children dd4f6311af52
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1 /*
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2 * Copyright (c) 2010-2013 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.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 import static org.tmatesoft.hg.internal.Internals.REVLOGV1_RECORD_SIZE;
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23 import java.io.File;
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24 import java.io.IOException;
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25 import java.util.zip.Inflater;
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27 import org.tmatesoft.hg.core.Nodeid;
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28 import org.tmatesoft.hg.repo.HgInternals;
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29 import org.tmatesoft.hg.repo.HgInvalidControlFileException;
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30 import org.tmatesoft.hg.repo.HgInvalidRevisionException;
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31 import org.tmatesoft.hg.repo.HgInvalidStateException;
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32 import org.tmatesoft.hg.repo.HgRepository;
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33 import org.tmatesoft.hg.util.Adaptable;
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36 /**
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37 * ? Single RevlogStream per file per repository with accessor to record access session (e.g. with back/forward operations),
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38 * or numerous RevlogStream with separate representation of the underlying data (cached, lazy ChunkStream)?
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39 *
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40 * @see http://mercurial.selenic.com/wiki/Revlog
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41 * @see http://mercurial.selenic.com/wiki/RevlogNG
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42 *
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43 * @author Artem Tikhomirov
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44 * @author TMate Software Ltd.
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45 */
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46 public class RevlogStream {
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48 /*
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49 * 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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50 *
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51 * long[] in fact (there are 8-bytes field in the revlog)
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52 * However, (a) DataAccess currently doesn't operate with long seek/length
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53 * and, of greater significance, (b) files with inlined data are designated for smaller files,
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54 * guess, about 130 Kb, and offset there won't ever break int capacity
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55 */
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56 private int[] indexRecordOffset;
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57 private int[] baseRevisions;
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58 private boolean inline = false;
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59 private final File indexFile;
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60 private File dataFile;
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61 private final DataAccessProvider dataAccess;
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63 // if we need anything else from HgRepo, might replace DAP parameter with HgRepo and query it for DAP.
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64 public RevlogStream(DataAccessProvider dap, File indexFile) {
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65 this.dataAccess = dap;
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66 this.indexFile = indexFile;
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67 }
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69 /*package*/ DataAccess getIndexStream() {
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70 // FIXME post 1.0 must supply a hint that I'll need really few bytes of data (perhaps, at some offset)
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71 // to avoid mmap files when only few bytes are to be read (i.e. #dataLength())
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72 return dataAccess.createReader(indexFile);
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73 }
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75 /*package*/ DataAccess getDataStream() {
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76 return dataAccess.createReader(getDataFile());
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77 }
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79 /*package*/ DataSerializer getIndexStreamWriter() {
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80 return dataAccess.createWriter(indexFile, true);
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81 }
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83 /*package*/ DataSerializer getDataStreamWriter() {
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84 return dataAccess.createWriter(getDataFile(), true);
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85 }
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87 /**
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88 * Constructs file object that corresponds to .d revlog counterpart.
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89 * Note, it's caller responsibility to ensure this file makes any sense (i.e. check {@link #inline} attribute)
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90 */
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91 private File getDataFile() {
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92 if (dataFile == null) {
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93 final String indexName = indexFile.getName();
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94 dataFile = new File(indexFile.getParentFile(), indexName.substring(0, indexName.length() - 1) + "d");
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95 }
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96 return dataFile;
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97 }
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98
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99 // initialize exception with the file where revlog structure information comes from
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100 public HgInvalidControlFileException initWithIndexFile(HgInvalidControlFileException ex) {
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101 return ex.setFile(indexFile);
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102 }
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103
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104 // initialize exception with the file where revlog data comes from
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105 public HgInvalidControlFileException initWithDataFile(HgInvalidControlFileException ex) {
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106 // exceptions are usually raised after read attepmt, hence inline shall be initialized
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107 // although honest approach is to call #initOutline() first
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108 return ex.setFile(inline ? indexFile : getDataFile());
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109 }
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111 /*package-private*/String getDataFileName() {
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112 // XXX a temporary solution to provide more info to fill in exceptions other than
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113 // HgInvalidControlFileException (those benefit from initWith* methods above)
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114 //
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115 // Besides, since RevlogStream represents both revlogs with user data (those with WC representative and
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116 // system data under store/data) and system-only revlogs (like changelog and manifest), there's no
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117 // easy way to supply human-friendly name of the active file (independent from whether it's index of data)
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118 return inline ? indexFile.getPath() : getDataFile().getPath();
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119 }
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120
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121 public boolean isInlineData() {
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122 initOutline();
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123 return inline;
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124 }
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125
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126 public int revisionCount() {
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127 initOutline();
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128 return baseRevisions.length;
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129 }
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130
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131 /**
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132 * @throws HgInvalidControlFileException if attempt to read index file failed
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133 * @throws HgInvalidRevisionException if revisionIndex argument doesn't represent a valid record in the revlog
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134 */
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135 public int dataLength(int revisionIndex) throws HgInvalidControlFileException, HgInvalidRevisionException {
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136 // XXX in fact, use of iterate() instead of this implementation may be quite reasonable.
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137 //
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138 revisionIndex = checkRevisionIndex(revisionIndex);
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139 DataAccess daIndex = getIndexStream();
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140 try {
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141 int recordOffset = getIndexOffsetInt(revisionIndex);
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142 daIndex.seek(recordOffset + 12); // 6+2+4
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143 int actualLen = daIndex.readInt();
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144 return actualLen;
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145 } catch (IOException ex) {
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146 throw new HgInvalidControlFileException(null, ex, indexFile).setRevisionIndex(revisionIndex);
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147 } finally {
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148 daIndex.done();
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149 }
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150 }
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151
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152 /**
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153 * Read nodeid at given index
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154 *
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155 * @throws HgInvalidControlFileException if attempt to read index file failed
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156 * @throws HgInvalidRevisionException if revisionIndex argument doesn't represent a valid record in the revlog
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157 */
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158 public byte[] nodeid(int revisionIndex) throws HgInvalidControlFileException, HgInvalidRevisionException {
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159 revisionIndex = checkRevisionIndex(revisionIndex);
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160 DataAccess daIndex = getIndexStream();
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161 try {
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162 int recordOffset = getIndexOffsetInt(revisionIndex);
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163 daIndex.seek(recordOffset + 32);
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164 byte[] rv = new byte[20];
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165 daIndex.readBytes(rv, 0, 20);
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166 return rv;
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167 } catch (IOException ex) {
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168 throw new HgInvalidControlFileException("Revision lookup failed", ex, indexFile).setRevisionIndex(revisionIndex);
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169 } finally {
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170 daIndex.done();
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171 }
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172 }
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173
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174 /**
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175 * Get link field from the index record.
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176 *
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177 * @throws HgInvalidControlFileException if attempt to read index file failed
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178 * @throws HgInvalidRevisionException if revisionIndex argument doesn't represent a valid record in the revlog
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179 */
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180 public int linkRevision(int revisionIndex) throws HgInvalidControlFileException, HgInvalidRevisionException {
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181 revisionIndex = checkRevisionIndex(revisionIndex);
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182 DataAccess daIndex = getIndexStream();
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183 try {
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184 int recordOffset = getIndexOffsetInt(revisionIndex);
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185 daIndex.seek(recordOffset + 20);
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186 int linkRev = daIndex.readInt();
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187 return linkRev;
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188 } catch (IOException ex) {
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189 throw new HgInvalidControlFileException("Linked revision lookup failed", ex, indexFile).setRevisionIndex(revisionIndex);
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190 } finally {
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191 daIndex.done();
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192 }
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193 }
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194
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195 // Perhaps, RevlogStream should be limited to use of plain int revisions for access,
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196 // while Nodeids should be kept on the level up, in Revlog. Guess, Revlog better keep
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197 // map of nodeids, and once this comes true, we may get rid of this method.
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198 // Unlike its counterpart, {@link Revlog#getLocalRevisionNumber()}, doesn't fail with exception if node not found,
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199 /**
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200 * @return integer in [0..revisionCount()) or {@link HgRepository#BAD_REVISION} if not found
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201 * @throws HgInvalidControlFileException if attempt to read index file failed
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202 */
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203 public int findRevisionIndex(Nodeid nodeid) throws HgInvalidControlFileException {
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204 // XXX this one may be implemented with iterate() once there's mechanism to stop iterations
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205 final int indexSize = revisionCount();
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206 DataAccess daIndex = getIndexStream();
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207 try {
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208 byte[] nodeidBuf = new byte[20];
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209 for (int i = 0; i < indexSize; i++) {
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210 daIndex.skip(8);
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211 int compressedLen = daIndex.readInt();
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212 daIndex.skip(20);
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213 daIndex.readBytes(nodeidBuf, 0, 20);
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214 if (nodeid.equalsTo(nodeidBuf)) {
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215 return i;
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216 }
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217 daIndex.skip(inline ? 12 + compressedLen : 12);
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218 }
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219 } catch (IOException ex) {
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220 throw new HgInvalidControlFileException("Revision lookup failed", ex, indexFile).setRevision(nodeid);
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221 } finally {
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222 daIndex.done();
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223 }
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224 return BAD_REVISION;
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225 }
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226
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227
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228 // should be possible to use TIP, ALL, or -1, -2, -n notation of Hg
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229 // ? boolean needsNodeid
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230 public void iterate(int start, int end, boolean needData, Inspector inspector) throws HgInvalidRevisionException, HgInvalidControlFileException {
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231 initOutline();
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232 final int indexSize = revisionCount();
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233 if (indexSize == 0) {
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234 return;
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235 }
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236 if (end == TIP) {
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237 end = indexSize - 1;
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238 }
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239 if (start == TIP) {
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240 start = indexSize - 1;
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241 }
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242 HgInternals.checkRevlogRange(start, end, indexSize-1);
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243 // XXX may cache [start .. end] from index with a single read (pre-read)
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244
242
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245 ReaderN1 r = new ReaderN1(needData, inspector);
2
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246 try {
242
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247 r.start(end - start + 1);
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248 r.range(start, end);
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249 } catch (IOException ex) {
366
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250 throw new HgInvalidControlFileException(String.format("Failed reading [%d..%d]", start, end), ex, indexFile);
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251 } catch (HgInvalidControlFileException ex) {
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diff changeset
252 throw ex;
242
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diff changeset
253 } finally {
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254 r.finish();
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255 }
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256 }
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257
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258 /**
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259 * Effective alternative to {@link #iterate(int, int, boolean, Inspector) batch read}, when only few selected
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260 * revisions are of interest.
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261 * @param sortedRevisions revisions to walk, in ascending order.
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262 * @param needData whether inspector needs access to header only
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263 * @param inspector callback to process entries
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264 */
366
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265 public void iterate(int[] sortedRevisions, boolean needData, Inspector inspector) throws HgInvalidRevisionException, HgInvalidControlFileException /*REVISIT - too general exception*/ {
242
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266 final int indexSize = revisionCount();
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267 if (indexSize == 0 || sortedRevisions.length == 0) {
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268 return;
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269 }
347
8da7ade36c57 Add specific IAE subclass to handle wrong (e.g. outdated after rollback) revisions
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270 if (sortedRevisions[0] > indexSize) {
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diff changeset
271 throw new HgInvalidRevisionException(String.format("Can't iterate [%d, %d] in range [0..%d]", sortedRevisions[0], sortedRevisions[sortedRevisions.length - 1], indexSize), null, sortedRevisions[0]);
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272 }
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273 if (sortedRevisions[sortedRevisions.length - 1] > indexSize) {
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274 throw new HgInvalidRevisionException(String.format("Can't iterate [%d, %d] in range [0..%d]", sortedRevisions[0], sortedRevisions[sortedRevisions.length - 1], indexSize), null, sortedRevisions[sortedRevisions.length - 1]);
242
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275 }
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276
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277 ReaderN1 r = new ReaderN1(needData, inspector);
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diff changeset
278 try {
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279 r.start(sortedRevisions.length);
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280 for (int i = 0; i < sortedRevisions.length; ) {
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281 int x = i;
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282 i++;
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283 while (i < sortedRevisions.length) {
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284 if (sortedRevisions[i] == sortedRevisions[i-1] + 1) {
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285 i++;
2
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286 } 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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287 break;
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288 }
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289 }
242
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290 // commitRevisions[x..i-1] are sequential
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291 if (!r.range(sortedRevisions[x], sortedRevisions[i-1])) {
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diff changeset
292 return;
51
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
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293 }
2
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294 }
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295 } catch (IOException ex) {
366
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296 final int c = sortedRevisions.length;
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297 throw new HgInvalidControlFileException(String.format("Failed reading %d revisions in [%d; %d]",c, sortedRevisions[0], sortedRevisions[c-1]), ex, indexFile);
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298 } catch (HgInvalidControlFileException ex) {
423
9c9c442b5f2e Major refactoring of exception handling. Low-level API uses RuntimeExceptions, while checked are left for higher level
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299 // TODO post-1.0 fill HgRuntimeException with appropriate file (either index or data, depending on error source)
366
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300 throw ex;
3
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
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diff changeset
301 } finally {
242
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302 r.finish();
2
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303 }
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304 }
198
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305
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306 private int getBaseRevision(int revision) {
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307 return baseRevisions[revision];
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308 }
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diff changeset
309
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310 /**
354
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311 * @param revisionIndex shall be valid index, [0..baseRevisions.length-1].
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312 * It's advised to use {@link #checkRevisionIndex(int)} to ensure argument is correct.
198
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313 * @return offset of the revision's record in the index (.i) stream
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diff changeset
314 */
354
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diff changeset
315 private int getIndexOffsetInt(int revisionIndex) {
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diff changeset
316 return inline ? indexRecordOffset[revisionIndex] : revisionIndex * REVLOGV1_RECORD_SIZE;
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317 }
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diff changeset
318
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diff changeset
319 private int checkRevisionIndex(int revisionIndex) throws HgInvalidRevisionException {
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320 final int last = revisionCount() - 1;
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diff changeset
321 if (revisionIndex == TIP) {
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diff changeset
322 revisionIndex = last;
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diff changeset
323 }
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diff changeset
324 if (revisionIndex < 0 || revisionIndex > last) {
5f9073eabf06 Propagate errors with exceptions up to a end client
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diff changeset
325 throw new HgInvalidRevisionException(revisionIndex).setRevisionIndex(revisionIndex, 0, last);
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diff changeset
326 }
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diff changeset
327 return revisionIndex;
198
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
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diff changeset
328 }
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
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parents: 170
diff changeset
329
425
48f993aa2f41 FIXMEs: exceptions, javadoc
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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diff changeset
330 private void initOutline() throws HgInvalidControlFileException {
198
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
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diff changeset
331 if (baseRevisions != null && baseRevisions.length > 0) {
2
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diff changeset
332 return;
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diff changeset
333 }
9
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
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diff changeset
334 DataAccess da = getIndexStream();
2
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diff changeset
335 try {
202
706bcc7cfee4 Basic test for HgIncomingCommand. Fix RepositoryComparator for cases when whole repository is unknown. Respect freshly initialized (empty) repositories in general.
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diff changeset
336 if (da.isEmpty()) {
706bcc7cfee4 Basic test for HgIncomingCommand. Fix RepositoryComparator for cases when whole repository is unknown. Respect freshly initialized (empty) repositories in general.
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diff changeset
337 // do not fail with exception if stream is empty, it's likely intentional
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diff changeset
338 baseRevisions = new int[0];
706bcc7cfee4 Basic test for HgIncomingCommand. Fix RepositoryComparator for cases when whole repository is unknown. Respect freshly initialized (empty) repositories in general.
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diff changeset
339 return;
706bcc7cfee4 Basic test for HgIncomingCommand. Fix RepositoryComparator for cases when whole repository is unknown. Respect freshly initialized (empty) repositories in general.
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diff changeset
340 }
9
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
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diff changeset
341 int versionField = da.readInt();
170
71ddbf8603e8 Initial clone: populate given directory from a bundle. Everything but remote server access is there, albeit prototype code style
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diff changeset
342 da.readInt(); // just to skip next 4 bytes of offset + flags
2
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diff changeset
343 final int INLINEDATA = 1 << 16;
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diff changeset
344 inline = (versionField & INLINEDATA) != 0;
288
b11f6a08f748 Avoid boxing int values and list resizes on revlog read
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 280
diff changeset
345 IntVector resBases, resOffsets = null;
420
6c22bdc0bdfd Respect long offsets in revlogs
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parents: 398
diff changeset
346 int entryCountGuess = Internals.ltoi(da.longLength() / REVLOGV1_RECORD_SIZE);
288
b11f6a08f748 Avoid boxing int values and list resizes on revlog read
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parents: 280
diff changeset
347 if (inline) {
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diff changeset
348 entryCountGuess >>>= 2; // pure guess, assume useful data takes 3/4 of total space
b11f6a08f748 Avoid boxing int values and list resizes on revlog read
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diff changeset
349 resOffsets = new IntVector(entryCountGuess, 5000);
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diff changeset
350 }
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diff changeset
351 resBases = new IntVector(entryCountGuess, 5000);
b11f6a08f748 Avoid boxing int values and list resizes on revlog read
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diff changeset
352
2
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diff changeset
353 long offset = 0; // first offset is always 0, thus Hg uses it for other purposes
9
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
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diff changeset
354 while(true) {
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
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diff changeset
355 int compressedLen = da.readInt();
5
fc265ddeab26 File content and non-effective, although working, patch application
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 4
diff changeset
356 // 8+4 = 12 bytes total read here
49
26e3eeaa3962 branch and user filtering for log operation
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 44
diff changeset
357 @SuppressWarnings("unused")
9
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
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diff changeset
358 int actualLen = da.readInt();
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
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diff changeset
359 int baseRevision = da.readInt();
5
fc265ddeab26 File content and non-effective, although working, patch application
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parents: 4
diff changeset
360 // 12 + 8 = 20 bytes read here
2
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parents: 0
diff changeset
361 // int linkRevision = di.readInt();
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parents: 0
diff changeset
362 // int parent1Revision = di.readInt();
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parents: 0
diff changeset
363 // int parent2Revision = di.readInt();
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364 // byte[] nodeid = new byte[32];
198
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365 resBases.add(baseRevision);
2
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366 if (inline) {
420
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367 int o = Internals.ltoi(offset);
198
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368 if (o != offset) {
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369 // just in case, can't happen, ever, unless HG (or some other bad tool) produces index file
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370 // with inlined data of size greater than 2 Gb.
423
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371 throw new HgInvalidStateException("Data too big, offset didn't fit to sizeof(int)");
198
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372 }
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373 resOffsets.add(o + REVLOGV1_RECORD_SIZE * resOffsets.size());
9
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374 da.skip(3*4 + 32 + compressedLen); // Check: 44 (skip) + 20 (read) = 64 (total RevlogNG record size)
2
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375 } else {
9
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376 da.skip(3*4 + 32);
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377 }
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378 if (da.isEmpty()) {
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379 // fine, done then
288
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380 baseRevisions = resBases.toArray(true);
198
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381 if (inline) {
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382 indexRecordOffset = resOffsets.toArray(true);
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383 }
9
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384 break;
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385 } else {
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386 // start reading next record
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387 long l = da.readLong();
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388 offset = l >>> 16;
9
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389 }
2
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390 }
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391 } catch (IOException ex) {
423
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392 throw new HgInvalidControlFileException("Failed to analyze revlog index", ex, indexFile);
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393 } finally {
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394 da.done();
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395 }
3
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396 }
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397
242
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398 /**
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399 * operation with single file open/close and multiple diverse reads.
366
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400 * XXX initOutline might need similar extraction to keep N1 format knowledge
242
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401 */
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402 class ReaderN1 {
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403 private final Inspector inspector;
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404 private final boolean needData;
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405 private DataAccess daIndex = null, daData = null;
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406 private Lifecycle.BasicCallback cb = null;
520
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407 private Lifecycle lifecycleListener = null;
242
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408 private int lastRevisionRead = BAD_REVISION;
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409 private DataAccess lastUserData;
263
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410 // next are to track two major bottlenecks - patch application and actual time spent in inspector
264
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411 // private long applyTime, inspectorTime; // TIMING
263
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412
242
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413
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414 public ReaderN1(boolean needData, Inspector insp) {
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415 assert insp != null;
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416 this.needData = needData;
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417 inspector = insp;
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418 }
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419
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420 public void start(int totalWork) {
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421 daIndex = getIndexStream();
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422 if (needData && !inline) {
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423 daData = getDataStream();
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424 }
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425 lifecycleListener = Adaptable.Factory.getAdapter(inspector, Lifecycle.class, null);
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426 if (lifecycleListener != null) {
242
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427 cb = new Lifecycle.BasicCallback();
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428 lifecycleListener.start(totalWork, cb, cb);
242
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429 }
264
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430 // applyTime = inspectorTime = 0; // TIMING
242
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431 }
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432
520
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433 // invoked only once per instance
242
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434 public void finish() {
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435 if (lastUserData != null) {
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436 lastUserData.done();
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437 lastUserData = null;
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438 }
520
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439 if (lifecycleListener != null) {
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440 lifecycleListener.finish(cb);
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441 lifecycleListener = null;
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442 cb = null;
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443
242
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444 }
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445 daIndex.done();
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446 if (daData != null) {
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447 daData.done();
520
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448 daData = null;
242
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449 }
264
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450 // System.out.printf("applyTime:%d ms, inspectorTime: %d ms\n", applyTime, inspectorTime); // TIMING
242
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451 }
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452
520
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453 // may be invoked few times per instance life
423
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454 public boolean range(int start, int end) throws IOException {
242
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455 byte[] nodeidBuf = new byte[20];
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456 int i;
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457 // it (i.e. replace with i >= start)
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458 if (needData && (i = getBaseRevision(start)) < start) {
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459 // if lastRevisionRead in [baseRevision(start), start) can reuse lastUserData
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460 // doesn't make sense to reuse if lastRevisionRead == start (too much to change in the cycle below).
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461 if (lastRevisionRead != BAD_REVISION && i <= lastRevisionRead && lastRevisionRead < start) {
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462 i = lastRevisionRead + 1; // start with first not-yet-read revision
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463 } else {
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464 if (lastUserData != null) {
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465 lastUserData.done();
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466 lastUserData = null;
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467 }
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468 }
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469 } else {
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470 // don't need to clean lastUserData as it's always null when !needData
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471 i = start;
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472 }
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473
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474 daIndex.seek(getIndexOffsetInt(i));
258
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diff changeset
475 //
263
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476 // reuse some instances
329
694ebabb5cb3 Refactor revlog patch mechanism, towards patch merging
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diff changeset
477 final Patch patch = new Patch();
263
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478 final Inflater inflater = new Inflater();
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479 // can share buffer between instances of InflaterDataAccess as I never read any two of them in parallel
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480 final byte[] inflaterBuffer = new byte[1024];
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481 //
242
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482
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483 for (; i <= end; i++ ) {
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484 if (inline && needData) {
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485 // inspector reading data (though FilterDataAccess) may have affected index position
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486 daIndex.seek(getIndexOffsetInt(i));
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487 }
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488 long l = daIndex.readLong(); // 0
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489 long offset = i == 0 ? 0 : (l >>> 16);
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490 @SuppressWarnings("unused")
420
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491 int flags = (int) (l & 0x0FFFF);
242
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diff changeset
492 int compressedLen = daIndex.readInt(); // +8
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diff changeset
493 int actualLen = daIndex.readInt(); // +12
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diff changeset
494 int baseRevision = daIndex.readInt(); // +16
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diff changeset
495 int linkRevision = daIndex.readInt(); // +20
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diff changeset
496 int parent1Revision = daIndex.readInt();
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497 int parent2Revision = daIndex.readInt();
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498 // Hg has 32 bytes here, uses 20 for nodeid, and keeps 12 last bytes empty
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diff changeset
499 daIndex.readBytes(nodeidBuf, 0, 20); // +32
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diff changeset
500 daIndex.skip(12);
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diff changeset
501 DataAccess userDataAccess = null;
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502 if (needData) {
420
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503 long streamOffset;
242
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504 DataAccess streamDataAccess;
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505 if (inline) {
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506 streamDataAccess = daIndex;
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diff changeset
507 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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508 } else {
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509 streamOffset = offset;
242
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510 streamDataAccess = daData;
420
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511 daData.longSeek(streamOffset);
242
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512 }
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diff changeset
513 final boolean patchToPrevious = baseRevision != i; // the only way I found to tell if it's a patch
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514 if (streamDataAccess.isEmpty() || compressedLen == 0) {
242
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515 userDataAccess = new DataAccess(); // empty
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516 } else {
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517 final byte firstByte = streamDataAccess.readByte();
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518 if (firstByte == 0x78 /* 'x' */) {
263
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519 inflater.reset();
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520 userDataAccess = new InflaterDataAccess(streamDataAccess, streamOffset, compressedLen, patchToPrevious ? -1 : actualLen, inflater, inflaterBuffer);
242
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521 } else if (firstByte == 0x75 /* 'u' */) {
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diff changeset
522 userDataAccess = new FilterDataAccess(streamDataAccess, streamOffset+1, compressedLen-1);
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523 } else {
397
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524 // XXX Python impl in fact throws exception when there's not 'x', 'u' or '0' but I don't see reason not to return data as is
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525 //
5e95b0da26f2 Issue 24: IAE, Underflow in FilterDataAccess. Issue 26:UnsupportedOperationException when patching empty base revision. Tests
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526 // although firstByte is already read from the streamDataAccess, FilterDataAccess#readByte would seek to
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527 // initial offset before first attempt to read a byte
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528 userDataAccess = new FilterDataAccess(streamDataAccess, streamOffset, compressedLen);
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529 }
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530 }
397
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diff changeset
531 // userDataAccess is revision content, either complete revision, patch of a previous content, or an empty patch
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532 if (patchToPrevious) {
242
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533 // this is a patch
397
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534 if (userDataAccess.isEmpty()) {
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535 // Issue 22, empty patch to an empty base revision
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diff changeset
536 // Issue 24, empty patch to non-empty base revision
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537 // empty patch modifies nothing, use content of a previous revision (shall present - it's a patch here)
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538 //
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539 assert lastUserData.length() == actualLen; // with no patch, data size shall be the same
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diff changeset
540 userDataAccess = lastUserData;
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541 } else {
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diff changeset
542 patch.read(userDataAccess);
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diff changeset
543 userDataAccess.done();
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544 //
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545 // it shall be reset at the end of prev iteration, when it got assigned from userDataAccess
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546 // however, actual userDataAccess and lastUserData may share Inflater object, which needs to be reset
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diff changeset
547 // Alternatively, userDataAccess.done() above may be responsible to reset Inflater (if it's InflaterDataAccess)
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diff changeset
548 lastUserData.reset();
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diff changeset
549 // final long startMeasuring = System.currentTimeMillis(); // TIMING
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diff changeset
550 byte[] userData = patch.apply(lastUserData, actualLen);
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diff changeset
551 // applyTime += (System.currentTimeMillis() - startMeasuring); // TIMING
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diff changeset
552 patch.clear(); // do not keep any reference, allow byte[] data to be gc'd
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diff changeset
553 userDataAccess = new ByteArrayDataAccess(userData);
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diff changeset
554 }
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diff changeset
555 }
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diff changeset
556 } else {
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diff changeset
557 if (inline) {
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diff changeset
558 daIndex.skip(compressedLen);
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diff changeset
559 }
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diff changeset
560 }
329
694ebabb5cb3 Refactor revlog patch mechanism, towards patch merging
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diff changeset
561 if (i >= start) {
264
6bb5e7ed051a Optimize memory usage (reduce number of objects instantiated) when pooling file names and nodeids during manifest parsing
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diff changeset
562 // final long startMeasuring = System.currentTimeMillis(); // TIMING
242
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diff changeset
563 inspector.next(i, actualLen, baseRevision, linkRevision, parent1Revision, parent2Revision, nodeidBuf, userDataAccess);
264
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diff changeset
564 // inspectorTime += (System.currentTimeMillis() - startMeasuring); // TIMING
242
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565 }
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diff changeset
566 if (cb != null) {
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567 if (cb.isStopped()) {
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568 return false;
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diff changeset
569 }
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570 }
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diff changeset
571 if (userDataAccess != null) {
263
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diff changeset
572 userDataAccess.reset(); // not sure this is necessary here, as lastUserData would get reset anyway before next use.
242
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diff changeset
573 }
397
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diff changeset
574 if (lastUserData != null && lastUserData != userDataAccess /* empty patch case, reuse of recent data in actual revision */) {
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diff changeset
575 // release lastUserData only if we didn't reuse it in actual revision due to empty patch:
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diff changeset
576 // empty patch means we have previous revision and didn't alter it with a patch, hence use lastUserData for userDataAccess above
263
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diff changeset
577 lastUserData.done();
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578 }
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diff changeset
579 lastUserData = userDataAccess;
242
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580 }
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diff changeset
581 lastRevisionRead = end;
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diff changeset
582 return true;
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583 }
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diff changeset
584 }
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diff changeset
585
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diff changeset
586
77
c677e1593919 Moved RevlogStream implementation into .internal
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diff changeset
587 public interface Inspector {
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diff changeset
588 // 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
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parents: 53 102
diff changeset
589 // 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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diff changeset
590 // implementers shall not invoke DataAccess.done(), it's accomplished by #iterate at appropraite moment
423
9c9c442b5f2e Major refactoring of exception handling. Low-level API uses RuntimeExceptions, while checked are left for higher level
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diff changeset
591 void next(int revisionIndex, 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
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592 }
0
dbd663faec1f Basic changelog parsing
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593 }