annotate src/org/tmatesoft/hg/internal/RevlogStream.java @ 566:32453f30de07 v1.1m3

Annotate command with command-line example
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 09 Apr 2013 19:25:34 +0200
parents 6ca3d0c5b4bc
children 5d7399ade999
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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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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 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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47
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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 * @return value suitable for the corresponding field in the new revision's header, not physical offset in the file
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229 * (which is different in case of inline revlogs)
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230 */
538
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231 public long newEntryOffset() {
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232 if (revisionCount() == 0) {
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233 return 0;
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234 }
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235 DataAccess daIndex = getIndexStream();
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236 int lastRev = revisionCount() - 1;
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237 try {
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238 int recordOffset = getIndexOffsetInt(lastRev);
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239 daIndex.seek(recordOffset);
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240 long value = daIndex.readLong();
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241 value = value >>> 16;
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242 int compressedLen = daIndex.readInt();
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243 return lastRev == 0 ? compressedLen : value + compressedLen;
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244 } catch (IOException ex) {
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245 throw new HgInvalidControlFileException("Linked revision lookup failed", ex, indexFile).setRevisionIndex(lastRev);
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246 } finally {
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247 daIndex.done();
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248 }
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249 }
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250
22
603806cd2dc6 Status of local working dir against non-tip base revision
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251
2
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252
3
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253 // should be possible to use TIP, ALL, or -1, -2, -n notation of Hg
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254 // ? boolean needsNodeid
423
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255 public void iterate(int start, int end, boolean needData, Inspector inspector) throws HgInvalidRevisionException, HgInvalidControlFileException {
2
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256 initOutline();
198
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257 final int indexSize = revisionCount();
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258 if (indexSize == 0) {
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259 return;
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260 }
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261 if (end == TIP) {
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262 end = indexSize - 1;
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263 }
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264 if (start == TIP) {
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265 start = indexSize - 1;
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266 }
300
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267 HgInternals.checkRevlogRange(start, end, indexSize-1);
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268 // XXX may cache [start .. end] from index with a single read (pre-read)
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269
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270 ReaderN1 r = new ReaderN1(needData, inspector);
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271 try {
242
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272 r.start(end - start + 1);
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273 r.range(start, end);
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274 } catch (IOException ex) {
366
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275 throw new HgInvalidControlFileException(String.format("Failed reading [%d..%d]", start, end), ex, indexFile);
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276 } catch (HgInvalidControlFileException ex) {
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277 throw ex;
242
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278 } finally {
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279 r.finish();
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280 }
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281 }
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282
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283 /**
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284 * Effective alternative to {@link #iterate(int, int, boolean, Inspector) batch read}, when only few selected
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285 * revisions are of interest.
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286 * @param sortedRevisions revisions to walk, in ascending order.
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287 * @param needData whether inspector needs access to header only
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288 * @param inspector callback to process entries
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289 */
366
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290 public void iterate(int[] sortedRevisions, boolean needData, Inspector inspector) throws HgInvalidRevisionException, HgInvalidControlFileException /*REVISIT - too general exception*/ {
242
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291 final int indexSize = revisionCount();
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292 if (indexSize == 0 || sortedRevisions.length == 0) {
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293 return;
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294 }
347
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295 if (sortedRevisions[0] > indexSize) {
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296 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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297 }
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298 if (sortedRevisions[sortedRevisions.length - 1] > indexSize) {
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299 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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300 }
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301
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302 ReaderN1 r = new ReaderN1(needData, inspector);
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303 try {
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304 r.start(sortedRevisions.length);
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305 for (int i = 0; i < sortedRevisions.length; ) {
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306 int x = i;
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307 i++;
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308 while (i < sortedRevisions.length) {
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309 if (sortedRevisions[i] == sortedRevisions[i-1] + 1) {
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310 i++;
2
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311 } 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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312 break;
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313 }
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314 }
242
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315 // commitRevisions[x..i-1] are sequential
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316 if (!r.range(sortedRevisions[x], sortedRevisions[i-1])) {
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317 return;
51
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318 }
2
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319 }
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320 } catch (IOException ex) {
366
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321 final int c = sortedRevisions.length;
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322 throw new HgInvalidControlFileException(String.format("Failed reading %d revisions in [%d; %d]",c, sortedRevisions[0], sortedRevisions[c-1]), ex, indexFile);
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323 } catch (HgInvalidControlFileException ex) {
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324 // TODO post-1.0 fill HgRuntimeException with appropriate file (either index or data, depending on error source)
366
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325 throw ex;
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326 } finally {
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327 r.finish();
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328 }
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329 }
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330
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331 void revisionAdded(int revisionIndex, Nodeid revision, int baseRevisionIndex, long revisionOffset) throws HgInvalidControlFileException {
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332 if (!outlineCached()) {
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333 return;
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334 }
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335 if (baseRevisions.length != revisionIndex) {
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336 throw new HgInvalidControlFileException(String.format("New entry's index shall be %d, not %d", baseRevisions.length, revisionIndex), null, indexFile);
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337 }
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338 if (baseRevisionIndex < 0 || baseRevisionIndex > baseRevisions.length) {
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339 // baseRevisionIndex MAY be == to baseRevisions.length, it's when new revision is based on itself
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340 throw new HgInvalidControlFileException(String.format("Base revision index %d doesn't fit [0..%d] range", baseRevisionIndex, baseRevisions.length), null, indexFile);
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341 }
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342 assert revision != null;
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343 assert !revision.isNull();
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344 int[] baseRevisionsCopy = new int[baseRevisions.length + 1];
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345 System.arraycopy(baseRevisions, 0, baseRevisionsCopy, 0, baseRevisions.length);
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346 baseRevisionsCopy[baseRevisions.length] = baseRevisionIndex;
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347 baseRevisions = baseRevisionsCopy;
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348 if (inline && indexRecordOffset != null) {
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349 assert indexRecordOffset.length == revisionIndex;
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350 int[] indexRecordOffsetCopy = new int[indexRecordOffset.length + 1];
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351 System.arraycopy(indexRecordOffset, 0, indexRecordOffsetCopy, 0, indexRecordOffset.length);
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352 indexRecordOffsetCopy[indexRecordOffset.length] = offsetFieldToInlineFileOffset(revisionOffset, revisionIndex);
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353 indexRecordOffset = indexRecordOffsetCopy;
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354 }
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355 }
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356
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357 private int getBaseRevision(int revision) {
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358 return baseRevisions[revision];
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359 }
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360
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361 /**
354
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362 * @param revisionIndex shall be valid index, [0..baseRevisions.length-1].
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363 * It's advised to use {@link #checkRevisionIndex(int)} to ensure argument is correct.
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364 * @return offset of the revision's record in the index (.i) stream
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365 */
354
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366 private int getIndexOffsetInt(int revisionIndex) {
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367 return inline ? indexRecordOffset[revisionIndex] : revisionIndex * REVLOGV1_RECORD_SIZE;
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368 }
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369
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diff changeset
370 private int checkRevisionIndex(int revisionIndex) throws HgInvalidRevisionException {
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diff changeset
371 final int last = revisionCount() - 1;
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diff changeset
372 if (revisionIndex == TIP) {
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diff changeset
373 revisionIndex = last;
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diff changeset
374 }
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diff changeset
375 if (revisionIndex < 0 || revisionIndex > last) {
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diff changeset
376 throw new HgInvalidRevisionException(revisionIndex).setRevisionIndex(revisionIndex, 0, last);
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diff changeset
377 }
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diff changeset
378 return revisionIndex;
198
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
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parents: 170
diff changeset
379 }
539
9edfd5a223b8 Commit: handle empty repository case
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diff changeset
380
9edfd5a223b8 Commit: handle empty repository case
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diff changeset
381 private boolean outlineCached() {
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diff changeset
382 return baseRevisions != null && baseRevisions.length > 0;
9edfd5a223b8 Commit: handle empty repository case
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diff changeset
383 }
9edfd5a223b8 Commit: handle empty repository case
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 538
diff changeset
384
9edfd5a223b8 Commit: handle empty repository case
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parents: 538
diff changeset
385 // translate 6-byte offset field value to pysical file offset for inline revlogs
9edfd5a223b8 Commit: handle empty repository case
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parents: 538
diff changeset
386 // DOESN'T MAKE SENSE if revlog with data is separate
9edfd5a223b8 Commit: handle empty repository case
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parents: 538
diff changeset
387 private static int offsetFieldToInlineFileOffset(long offset, int recordIndex) throws HgInvalidStateException {
9edfd5a223b8 Commit: handle empty repository case
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parents: 538
diff changeset
388 int o = Internals.ltoi(offset);
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parents: 538
diff changeset
389 if (o != offset) {
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diff changeset
390 // just in case, can't happen, ever, unless HG (or some other bad tool) produces index file
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diff changeset
391 // with inlined data of size greater than 2 Gb.
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392 throw new HgInvalidStateException("Data too big, offset didn't fit to sizeof(int)");
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393 }
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diff changeset
394 return o + REVLOGV1_RECORD_SIZE * recordIndex;
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parents: 538
diff changeset
395 }
198
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
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parents: 170
diff changeset
396
425
48f993aa2f41 FIXMEs: exceptions, javadoc
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parents: 423
diff changeset
397 private void initOutline() throws HgInvalidControlFileException {
539
9edfd5a223b8 Commit: handle empty repository case
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diff changeset
398 if (outlineCached()) {
2
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parents: 0
diff changeset
399 return;
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400 }
9
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parents: 6
diff changeset
401 DataAccess da = getIndexStream();
2
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parents: 0
diff changeset
402 try {
202
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diff changeset
403 if (da.isEmpty()) {
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diff changeset
404 // do not fail with exception if stream is empty, it's likely intentional
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
405 baseRevisions = new int[0];
539
9edfd5a223b8 Commit: handle empty repository case
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diff changeset
406 // empty revlog, likely to be populated, indicate we start with a single file
9edfd5a223b8 Commit: handle empty repository case
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diff changeset
407 inline = true;
202
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diff changeset
408 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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parents: 198
diff changeset
409 }
9
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
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parents: 6
diff changeset
410 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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parents: 158
diff changeset
411 da.readInt(); // just to skip next 4 bytes of offset + flags
2
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parents: 0
diff changeset
412 final int INLINEDATA = 1 << 16;
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diff changeset
413 inline = (versionField & INLINEDATA) != 0;
288
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diff changeset
414 IntVector resBases, resOffsets = null;
420
6c22bdc0bdfd Respect long offsets in revlogs
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parents: 398
diff changeset
415 int entryCountGuess = Internals.ltoi(da.longLength() / REVLOGV1_RECORD_SIZE);
288
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parents: 280
diff changeset
416 if (inline) {
b11f6a08f748 Avoid boxing int values and list resizes on revlog read
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parents: 280
diff changeset
417 entryCountGuess >>>= 2; // pure guess, assume useful data takes 3/4 of total space
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diff changeset
418 resOffsets = new IntVector(entryCountGuess, 5000);
b11f6a08f748 Avoid boxing int values and list resizes on revlog read
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diff changeset
419 }
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diff changeset
420 resBases = new IntVector(entryCountGuess, 5000);
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diff changeset
421
2
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parents: 0
diff changeset
422 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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parents: 6
diff changeset
423 while(true) {
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
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diff changeset
424 int compressedLen = da.readInt();
5
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parents: 4
diff changeset
425 // 8+4 = 12 bytes total read here
49
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diff changeset
426 @SuppressWarnings("unused")
9
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diff changeset
427 int actualLen = da.readInt();
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428 int baseRevision = da.readInt();
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diff changeset
429 // 12 + 8 = 20 bytes read here
2
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parents: 0
diff changeset
430 // int linkRevision = di.readInt();
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parents: 0
diff changeset
431 // int parent1Revision = di.readInt();
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diff changeset
432 // int parent2Revision = di.readInt();
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433 // byte[] nodeid = new byte[32];
198
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diff changeset
434 resBases.add(baseRevision);
2
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parents: 0
diff changeset
435 if (inline) {
539
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diff changeset
436 int o = offsetFieldToInlineFileOffset(offset, resOffsets.size());
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diff changeset
437 resOffsets.add(o);
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diff changeset
438 da.skip(3*4 + 32 + compressedLen); // Check: 44 (skip) + 20 (read) = 64 (total RevlogNG record size)
2
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parents: 0
diff changeset
439 } else {
9
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
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diff changeset
440 da.skip(3*4 + 32);
2
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parents: 0
diff changeset
441 }
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents: 9
diff changeset
442 if (da.isEmpty()) {
9
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diff changeset
443 // fine, done then
288
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diff changeset
444 baseRevisions = resBases.toArray(true);
198
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diff changeset
445 if (inline) {
288
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parents: 280
diff changeset
446 indexRecordOffset = resOffsets.toArray(true);
198
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parents: 170
diff changeset
447 }
9
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parents: 6
diff changeset
448 break;
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents: 9
diff changeset
449 } else {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents: 9
diff changeset
450 // start reading next record
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 9
diff changeset
451 long l = da.readLong();
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents: 9
diff changeset
452 offset = l >>> 16;
9
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
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parents: 6
diff changeset
453 }
2
08db726a0fb7 Shaping out low-level Hg structures
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parents: 0
diff changeset
454 }
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
455 } catch (IOException ex) {
423
9c9c442b5f2e Major refactoring of exception handling. Low-level API uses RuntimeExceptions, while checked are left for higher level
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 420
diff changeset
456 throw new HgInvalidControlFileException("Failed to analyze revlog index", ex, indexFile);
9
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
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parents: 6
diff changeset
457 } finally {
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
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parents: 6
diff changeset
458 da.done();
2
08db726a0fb7 Shaping out low-level Hg structures
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parents: 0
diff changeset
459 }
3
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
460 }
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
461
242
ad6a046943be Improved reading of sparse revisions from a revlog
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diff changeset
462 /**
ad6a046943be Improved reading of sparse revisions from a revlog
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diff changeset
463 * operation with single file open/close and multiple diverse reads.
366
189dc6dc1c3e Use exceptions to expose errors reading mercurial data
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diff changeset
464 * XXX initOutline might need similar extraction to keep N1 format knowledge
242
ad6a046943be Improved reading of sparse revisions from a revlog
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diff changeset
465 */
ad6a046943be Improved reading of sparse revisions from a revlog
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diff changeset
466 class ReaderN1 {
ad6a046943be Improved reading of sparse revisions from a revlog
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diff changeset
467 private final Inspector inspector;
ad6a046943be Improved reading of sparse revisions from a revlog
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diff changeset
468 private final boolean needData;
ad6a046943be Improved reading of sparse revisions from a revlog
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diff changeset
469 private DataAccess daIndex = null, daData = null;
ad6a046943be Improved reading of sparse revisions from a revlog
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diff changeset
470 private Lifecycle.BasicCallback cb = null;
520
1ee452f31187 Experimental support for inverse direction history walking. Refactored/streamlined cancellation in HgLogCommand and down the stack
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diff changeset
471 private Lifecycle lifecycleListener = null;
242
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diff changeset
472 private int lastRevisionRead = BAD_REVISION;
ad6a046943be Improved reading of sparse revisions from a revlog
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diff changeset
473 private DataAccess lastUserData;
263
31f67be94e71 RevlogStream - reduce number of object instances, reuse when possible
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 258
diff changeset
474 // next are to track two major bottlenecks - patch application and actual time spent in inspector
264
6bb5e7ed051a Optimize memory usage (reduce number of objects instantiated) when pooling file names and nodeids during manifest parsing
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 263
diff changeset
475 // private long applyTime, inspectorTime; // TIMING
263
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parents: 258
diff changeset
476
242
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diff changeset
477
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diff changeset
478 public ReaderN1(boolean needData, Inspector insp) {
ad6a046943be Improved reading of sparse revisions from a revlog
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diff changeset
479 assert insp != null;
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diff changeset
480 this.needData = needData;
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diff changeset
481 inspector = insp;
ad6a046943be Improved reading of sparse revisions from a revlog
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diff changeset
482 }
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
483
ad6a046943be Improved reading of sparse revisions from a revlog
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diff changeset
484 public void start(int totalWork) {
ad6a046943be Improved reading of sparse revisions from a revlog
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diff changeset
485 daIndex = getIndexStream();
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
486 if (needData && !inline) {
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diff changeset
487 daData = getDataStream();
ad6a046943be Improved reading of sparse revisions from a revlog
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diff changeset
488 }
520
1ee452f31187 Experimental support for inverse direction history walking. Refactored/streamlined cancellation in HgLogCommand and down the stack
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parents: 440
diff changeset
489 lifecycleListener = Adaptable.Factory.getAdapter(inspector, Lifecycle.class, null);
1ee452f31187 Experimental support for inverse direction history walking. Refactored/streamlined cancellation in HgLogCommand and down the stack
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parents: 440
diff changeset
490 if (lifecycleListener != null) {
242
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diff changeset
491 cb = new Lifecycle.BasicCallback();
520
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492 lifecycleListener.start(totalWork, cb, cb);
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493 }
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494 // applyTime = inspectorTime = 0; // TIMING
242
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495 }
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496
520
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497 // invoked only once per instance
242
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diff changeset
498 public void finish() {
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499 if (lastUserData != null) {
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500 lastUserData.done();
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501 lastUserData = null;
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502 }
520
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503 if (lifecycleListener != null) {
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504 lifecycleListener.finish(cb);
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505 lifecycleListener = null;
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506 cb = null;
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507
242
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508 }
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diff changeset
509 daIndex.done();
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510 if (daData != null) {
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511 daData.done();
520
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512 daData = null;
242
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513 }
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514 // System.out.printf("applyTime:%d ms, inspectorTime: %d ms\n", applyTime, inspectorTime); // TIMING
242
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515 }
263
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516
520
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diff changeset
517 // may be invoked few times per instance life
423
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518 public boolean range(int start, int end) throws IOException {
242
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519 byte[] nodeidBuf = new byte[20];
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520 int i;
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521 // it (i.e. replace with i >= start)
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diff changeset
522 if (needData && (i = getBaseRevision(start)) < start) {
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523 // if lastRevisionRead in [baseRevision(start), start) can reuse lastUserData
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diff changeset
524 // doesn't make sense to reuse if lastRevisionRead == start (too much to change in the cycle below).
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diff changeset
525 if (lastRevisionRead != BAD_REVISION && i <= lastRevisionRead && lastRevisionRead < start) {
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diff changeset
526 i = lastRevisionRead + 1; // start with first not-yet-read revision
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diff changeset
527 } else {
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528 if (lastUserData != null) {
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diff changeset
529 lastUserData.done();
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diff changeset
530 lastUserData = null;
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531 }
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532 }
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diff changeset
533 } else {
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534 // don't need to clean lastUserData as it's always null when !needData
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535 i = start;
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536 }
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diff changeset
537
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diff changeset
538 daIndex.seek(getIndexOffsetInt(i));
258
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539 //
263
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540 // reuse some instances
329
694ebabb5cb3 Refactor revlog patch mechanism, towards patch merging
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541 final Patch patch = new Patch();
263
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542 final Inflater inflater = new Inflater();
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543 // can share buffer between instances of InflaterDataAccess as I never read any two of them in parallel
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diff changeset
544 final byte[] inflaterBuffer = new byte[1024];
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diff changeset
545 //
242
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546
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diff changeset
547 for (; i <= end; i++ ) {
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548 if (inline && needData) {
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549 // inspector reading data (though FilterDataAccess) may have affected index position
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550 daIndex.seek(getIndexOffsetInt(i));
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551 }
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552 long l = daIndex.readLong(); // 0
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553 long offset = i == 0 ? 0 : (l >>> 16);
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554 @SuppressWarnings("unused")
420
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555 int flags = (int) (l & 0x0FFFF);
242
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diff changeset
556 int compressedLen = daIndex.readInt(); // +8
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557 int actualLen = daIndex.readInt(); // +12
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558 int baseRevision = daIndex.readInt(); // +16
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diff changeset
559 int linkRevision = daIndex.readInt(); // +20
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diff changeset
560 int parent1Revision = daIndex.readInt();
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561 int parent2Revision = daIndex.readInt();
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diff changeset
562 // Hg has 32 bytes here, uses 20 for nodeid, and keeps 12 last bytes empty
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diff changeset
563 daIndex.readBytes(nodeidBuf, 0, 20); // +32
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diff changeset
564 daIndex.skip(12);
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diff changeset
565 DataAccess userDataAccess = null;
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566 if (needData) {
420
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diff changeset
567 long streamOffset;
242
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diff changeset
568 DataAccess streamDataAccess;
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diff changeset
569 if (inline) {
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diff changeset
570 streamDataAccess = daIndex;
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diff changeset
571 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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572 } else {
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573 streamOffset = offset;
242
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574 streamDataAccess = daData;
420
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575 daData.longSeek(streamOffset);
242
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576 }
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diff changeset
577 final boolean patchToPrevious = baseRevision != i; // the only way I found to tell if it's a patch
397
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578 if (streamDataAccess.isEmpty() || compressedLen == 0) {
242
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diff changeset
579 userDataAccess = new DataAccess(); // empty
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diff changeset
580 } else {
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diff changeset
581 final byte firstByte = streamDataAccess.readByte();
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diff changeset
582 if (firstByte == 0x78 /* 'x' */) {
263
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diff changeset
583 inflater.reset();
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584 userDataAccess = new InflaterDataAccess(streamDataAccess, streamOffset, compressedLen, patchToPrevious ? -1 : actualLen, inflater, inflaterBuffer);
242
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diff changeset
585 } else if (firstByte == 0x75 /* 'u' */) {
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diff changeset
586 userDataAccess = new FilterDataAccess(streamDataAccess, streamOffset+1, compressedLen-1);
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587 } else {
397
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diff changeset
588 // 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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diff changeset
589 //
5e95b0da26f2 Issue 24: IAE, Underflow in FilterDataAccess. Issue 26:UnsupportedOperationException when patching empty base revision. Tests
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diff changeset
590 // although firstByte is already read from the streamDataAccess, FilterDataAccess#readByte would seek to
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591 // initial offset before first attempt to read a byte
242
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diff changeset
592 userDataAccess = new FilterDataAccess(streamDataAccess, streamOffset, compressedLen);
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593 }
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594 }
397
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diff changeset
595 // userDataAccess is revision content, either complete revision, patch of a previous content, or an empty patch
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diff changeset
596 if (patchToPrevious) {
242
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diff changeset
597 // this is a patch
397
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diff changeset
598 if (userDataAccess.isEmpty()) {
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diff changeset
599 // Issue 22, empty patch to an empty base revision
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diff changeset
600 // Issue 24, empty patch to non-empty base revision
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diff changeset
601 // empty patch modifies nothing, use content of a previous revision (shall present - it's a patch here)
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602 //
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diff changeset
603 assert lastUserData.length() == actualLen; // with no patch, data size shall be the same
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diff changeset
604 userDataAccess = lastUserData;
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605 } else {
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diff changeset
606 patch.read(userDataAccess);
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607 userDataAccess.done();
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608 //
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609 // it shall be reset at the end of prev iteration, when it got assigned from userDataAccess
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610 // however, actual userDataAccess and lastUserData may share Inflater object, which needs to be reset
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611 // Alternatively, userDataAccess.done() above may be responsible to reset Inflater (if it's InflaterDataAccess)
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612 lastUserData.reset();
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613 // final long startMeasuring = System.currentTimeMillis(); // TIMING
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614 byte[] userData = patch.apply(lastUserData, actualLen);
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615 // applyTime += (System.currentTimeMillis() - startMeasuring); // TIMING
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616 patch.clear(); // do not keep any reference, allow byte[] data to be gc'd
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617 userDataAccess = new ByteArrayDataAccess(userData);
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618 }
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619 }
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620 } else {
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621 if (inline) {
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622 daIndex.skip(compressedLen);
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623 }
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624 }
329
694ebabb5cb3 Refactor revlog patch mechanism, towards patch merging
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625 if (i >= start) {
264
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626 // final long startMeasuring = System.currentTimeMillis(); // TIMING
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627 inspector.next(i, actualLen, baseRevision, linkRevision, parent1Revision, parent2Revision, nodeidBuf, userDataAccess);
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628 // inspectorTime += (System.currentTimeMillis() - startMeasuring); // TIMING
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629 }
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630 if (cb != null) {
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631 if (cb.isStopped()) {
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632 return false;
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633 }
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634 }
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635 if (userDataAccess != null) {
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636 userDataAccess.reset(); // not sure this is necessary here, as lastUserData would get reset anyway before next use.
242
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637 }
397
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638 if (lastUserData != null && lastUserData != userDataAccess /* empty patch case, reuse of recent data in actual revision */) {
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639 // release lastUserData only if we didn't reuse it in actual revision due to empty patch:
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640 // empty patch means we have previous revision and didn't alter it with a patch, hence use lastUserData for userDataAccess above
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641 lastUserData.done();
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642 }
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643 lastUserData = userDataAccess;
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644 }
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645 lastRevisionRead = end;
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646 return true;
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647 }
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648 }
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649
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650
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651 public interface Inspector {
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652 // XXX boolean retVal to indicate whether to continue?
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653 // 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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654 // implementers shall not invoke DataAccess.done(), it's accomplished by #iterate at appropraite moment
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655 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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656 }
539
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657
0
dbd663faec1f Basic changelog parsing
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658 }