Mercurial > hg4j
annotate src/org/tmatesoft/hg/internal/RevlogStream.java @ 633:e66788de0cf8
Added tag v1.1rc2 for changeset 54e16ab771ec
author | Artem Tikhomirov <tikhomirov.artem@gmail.com> |
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date | Thu, 30 May 2013 16:14:46 +0200 |
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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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22 |
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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.lang.ref.Reference; |
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26 import java.lang.ref.ReferenceQueue; |
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27 import java.lang.ref.SoftReference; |
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28 import java.util.ArrayList; |
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29 import java.util.List; |
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30 import java.util.zip.Inflater; |
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31 |
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32 import org.tmatesoft.hg.core.HgIOException; |
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33 import org.tmatesoft.hg.core.Nodeid; |
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34 import org.tmatesoft.hg.repo.HgInternals; |
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35 import org.tmatesoft.hg.repo.HgInvalidControlFileException; |
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36 import org.tmatesoft.hg.repo.HgInvalidRevisionException; |
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37 import org.tmatesoft.hg.repo.HgInvalidStateException; |
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38 import org.tmatesoft.hg.repo.HgRepository; |
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39 import org.tmatesoft.hg.repo.HgRuntimeException; |
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40 import org.tmatesoft.hg.util.Adaptable; |
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41 |
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42 |
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43 /** |
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44 * ? Single RevlogStream per file per repository with accessor to record access session (e.g. with back/forward operations), |
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45 * or numerous RevlogStream with separate representation of the underlying data (cached, lazy ChunkStream)? |
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46 * |
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47 * @see http://mercurial.selenic.com/wiki/Revlog |
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48 * @see http://mercurial.selenic.com/wiki/RevlogNG |
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49 * |
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50 * @author Artem Tikhomirov |
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51 * @author TMate Software Ltd. |
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52 */ |
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53 public class RevlogStream { |
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54 |
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55 static final int INLINEDATA = 1 << 16; |
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56 |
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57 /* |
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58 * 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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59 * |
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60 * long[] in fact (there are 8-bytes field in the revlog) |
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61 * However, (a) DataAccess currently doesn't operate with long seek/length |
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62 * and, of greater significance, (b) files with inlined data are designated for smaller files, |
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63 * guess, about 130 Kb, and offset there won't ever break int capacity |
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64 */ |
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65 private int[] indexRecordOffset; |
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66 private int[] baseRevisions; |
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67 private boolean inline = false; |
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68 private final File indexFile; |
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69 private File dataFile; |
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70 private final Internals repo; |
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71 // keeps last complete revision we've read. Note, this cached revision doesn't help |
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72 // for subsequent #iterate() calls with the same revision (Inspector needs more data than |
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73 // we currently cache here, perhaps, we shall cache everything it wants to cover same |
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74 // revision case as well). Now this helps when second #iterate() call is for a revision greater |
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75 // than one from the first call, and both revisions got same base rev. It's often the case when |
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76 // parents/children are analyzed. |
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77 private SoftReference<CachedRevision> lastRevisionRead; |
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78 private final ReferenceQueue<CachedRevision> lastRevisionQueue = new ReferenceQueue<CachedRevision>(); |
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79 // |
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80 private final RevlogChangeMonitor changeTracker; |
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81 private List<Observer> observers; |
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82 private boolean shallDropDerivedCaches = false; |
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83 |
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84 public RevlogStream(Internals hgRepo, File indexFile) { |
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85 repo = hgRepo; |
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86 this.indexFile = indexFile; |
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87 changeTracker = repo.getRevlogTracker(indexFile); |
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88 } |
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89 |
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90 public boolean exists() { |
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91 return indexFile.exists(); |
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92 } |
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93 |
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94 /** |
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95 * @param shortRead pass <code>true</code> to indicate intention to read few revisions only (as opposed to reading most of/complete revlog) |
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96 * @return never <code>null</code>, empty {@link DataAccess} if no stream is available |
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97 */ |
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98 /*package*/ DataAccess getIndexStream(boolean shortRead) { |
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99 // shortRead hint helps to avoid mmap files when only |
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100 // few bytes are to be read (i.e. #dataLength()) |
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101 DataAccessProvider dataAccess = repo.getDataAccess(); |
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102 return dataAccess.createReader(indexFile, shortRead); |
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103 } |
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104 |
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105 /*package*/ DataAccess getDataStream() { |
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106 DataAccessProvider dataAccess = repo.getDataAccess(); |
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107 return dataAccess.createReader(getDataFile(), false); |
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108 } |
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109 |
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110 /*package*/ DataSerializer getIndexStreamWriter(Transaction tr) throws HgIOException { |
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111 DataAccessProvider dataAccess = repo.getDataAccess(); |
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112 return dataAccess.createWriter(tr, indexFile, true); |
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113 } |
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114 |
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115 /*package*/ DataSerializer getDataStreamWriter(Transaction tr) throws HgIOException { |
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116 DataAccessProvider dataAccess = repo.getDataAccess(); |
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117 return dataAccess.createWriter(tr, getDataFile(), true); |
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118 } |
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119 |
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120 /** |
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121 * Constructs file object that corresponds to .d revlog counterpart. |
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122 * Note, it's caller responsibility to ensure this file makes any sense (i.e. check {@link #inline} attribute) |
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123 */ |
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124 private File getDataFile() { |
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125 if (dataFile == null) { |
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126 final String indexName = indexFile.getName(); |
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127 dataFile = new File(indexFile.getParentFile(), indexName.substring(0, indexName.length() - 1) + "d"); |
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128 } |
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129 return dataFile; |
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130 } |
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131 |
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132 // initialize exception with the file where revlog structure information comes from |
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133 public HgInvalidControlFileException initWithIndexFile(HgInvalidControlFileException ex) { |
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134 return ex.setFile(indexFile); |
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135 } |
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136 |
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137 // initialize exception with the file where revlog data comes from |
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138 public HgInvalidControlFileException initWithDataFile(HgInvalidControlFileException ex) { |
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139 // exceptions are usually raised after read attepmt, hence inline shall be initialized |
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140 // although honest approach is to call #initOutline() first |
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141 return ex.setFile(inline ? indexFile : getDataFile()); |
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142 } |
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143 |
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144 /*package-private*/String getDataFileName() { |
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145 // XXX a temporary solution to provide more info to fill in exceptions other than |
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146 // HgInvalidControlFileException (those benefit from initWith* methods above) |
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147 // |
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148 // Besides, since RevlogStream represents both revlogs with user data (those with WC representative and |
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149 // system data under store/data) and system-only revlogs (like changelog and manifest), there's no |
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150 // easy way to supply human-friendly name of the active file (independent from whether it's index of data) |
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151 return inline ? indexFile.getPath() : getDataFile().getPath(); |
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152 } |
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153 |
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154 public boolean isInlineData() throws HgInvalidControlFileException { |
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155 initOutline(); |
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156 return inline; |
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157 } |
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158 |
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159 public int revisionCount() throws HgInvalidControlFileException { |
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160 initOutline(); |
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161 return baseRevisions.length; |
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162 } |
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163 |
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164 /** |
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165 * @throws HgInvalidControlFileException if attempt to read index file failed |
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166 * @throws HgInvalidRevisionException if revisionIndex argument doesn't represent a valid record in the revlog |
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167 */ |
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168 public int dataLength(int revisionIndex) throws HgInvalidControlFileException, HgInvalidRevisionException { |
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169 // XXX in fact, use of iterate() instead of this implementation may be quite reasonable. |
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170 // |
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171 revisionIndex = checkRevisionIndex(revisionIndex); |
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172 DataAccess daIndex = getIndexStream(true); |
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173 try { |
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174 int recordOffset = getIndexOffsetInt(revisionIndex); |
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175 daIndex.seek(recordOffset + 12); // 6+2+4 |
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176 int actualLen = daIndex.readInt(); |
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177 return actualLen; |
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178 } catch (IOException ex) { |
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179 throw new HgInvalidControlFileException(null, ex, indexFile).setRevisionIndex(revisionIndex); |
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180 } finally { |
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181 daIndex.done(); |
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182 } |
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183 } |
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184 |
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185 /** |
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186 * Read nodeid at given index |
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187 * |
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188 * @throws HgInvalidControlFileException if attempt to read index file failed |
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189 * @throws HgInvalidRevisionException if revisionIndex argument doesn't represent a valid record in the revlog |
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190 */ |
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191 public byte[] nodeid(int revisionIndex) throws HgInvalidControlFileException, HgInvalidRevisionException { |
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192 revisionIndex = checkRevisionIndex(revisionIndex); |
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193 DataAccess daIndex = getIndexStream(true); |
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194 try { |
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195 int recordOffset = getIndexOffsetInt(revisionIndex); |
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196 daIndex.seek(recordOffset + 32); |
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197 byte[] rv = new byte[20]; |
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198 daIndex.readBytes(rv, 0, 20); |
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199 return rv; |
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200 } catch (IOException ex) { |
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201 throw new HgInvalidControlFileException("Revision lookup failed", ex, indexFile).setRevisionIndex(revisionIndex); |
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202 } finally { |
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203 daIndex.done(); |
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204 } |
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205 } |
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206 |
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207 /** |
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208 * Get link field from the index record. |
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209 * |
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210 * @throws HgInvalidControlFileException if attempt to read index file failed |
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211 * @throws HgInvalidRevisionException if revisionIndex argument doesn't represent a valid record in the revlog |
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212 */ |
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213 public int linkRevision(int revisionIndex) throws HgInvalidControlFileException, HgInvalidRevisionException { |
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214 revisionIndex = checkRevisionIndex(revisionIndex); |
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215 DataAccess daIndex = getIndexStream(true); |
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216 try { |
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217 int recordOffset = getIndexOffsetInt(revisionIndex); |
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218 daIndex.seek(recordOffset + 20); |
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219 int linkRev = daIndex.readInt(); |
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220 return linkRev; |
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221 } catch (IOException ex) { |
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222 throw new HgInvalidControlFileException("Linked revision lookup failed", ex, indexFile).setRevisionIndex(revisionIndex); |
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223 } finally { |
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224 daIndex.done(); |
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225 } |
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226 } |
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227 |
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228 /** |
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229 * Extract base revision field from the revlog |
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230 * |
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231 * @throws HgInvalidControlFileException if attempt to read index file failed |
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232 * @throws HgInvalidRevisionException if revisionIndex argument doesn't represent a valid record in the revlog |
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233 */ |
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234 public int baseRevision(int revisionIndex) throws HgInvalidControlFileException, HgInvalidRevisionException { |
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235 revisionIndex = checkRevisionIndex(revisionIndex); |
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236 return getBaseRevision(revisionIndex); |
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237 } |
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238 |
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239 // Perhaps, RevlogStream should be limited to use of plain int revisions for access, |
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240 // while Nodeids should be kept on the level up, in Revlog. Guess, Revlog better keep |
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241 // map of nodeids, and once this comes true, we may get rid of this method. |
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242 // Unlike its counterpart, {@link Revlog#getLocalRevisionNumber()}, doesn't fail with exception if node not found, |
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243 /** |
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244 * @return integer in [0..revisionCount()) or {@link HgRepository#BAD_REVISION} if not found |
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245 * @throws HgInvalidControlFileException if attempt to read index file failed |
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246 */ |
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247 public int findRevisionIndex(Nodeid nodeid) throws HgInvalidControlFileException { |
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248 // XXX this one may be implemented with iterate() once there's mechanism to stop iterations |
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249 final int indexSize = revisionCount(); |
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250 DataAccess daIndex = getIndexStream(false); |
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251 try { |
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252 byte[] nodeidBuf = new byte[20]; |
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253 for (int i = 0; i < indexSize; i++) { |
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254 daIndex.skip(8); |
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255 int compressedLen = daIndex.readInt(); |
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256 daIndex.skip(20); |
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257 daIndex.readBytes(nodeidBuf, 0, 20); |
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258 if (nodeid.equalsTo(nodeidBuf)) { |
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259 return i; |
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260 } |
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261 daIndex.skip(inline ? 12 + compressedLen : 12); |
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262 } |
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263 } catch (IOException ex) { |
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264 throw new HgInvalidControlFileException("Revision lookup failed", ex, indexFile).setRevision(nodeid); |
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265 } finally { |
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266 daIndex.done(); |
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267 } |
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268 return BAD_REVISION; |
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269 } |
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270 |
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271 /** |
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272 * @return value suitable for the corresponding field in the new revision's header, not physical offset in the file |
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273 * (which is different in case of inline revlogs) |
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274 */ |
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275 public long newEntryOffset() throws HgInvalidControlFileException { |
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276 if (revisionCount() == 0) { |
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277 return 0; |
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278 } |
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279 DataAccess daIndex = getIndexStream(true); |
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280 int lastRev = revisionCount() - 1; |
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281 try { |
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282 int recordOffset = getIndexOffsetInt(lastRev); |
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283 daIndex.seek(recordOffset); |
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284 long value = daIndex.readLong(); |
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285 value = value >>> 16; |
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286 int compressedLen = daIndex.readInt(); |
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287 return lastRev == 0 ? compressedLen : value + compressedLen; |
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288 } catch (IOException ex) { |
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289 throw new HgInvalidControlFileException("Linked revision lookup failed", ex, indexFile).setRevisionIndex(lastRev); |
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290 } finally { |
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291 daIndex.done(); |
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292 } |
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293 } |
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294 |
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295 /** |
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296 * should be possible to use TIP, ALL, or -1, -2, -n notation of Hg |
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297 * ? boolean needsNodeid |
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298 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em> |
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299 */ |
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300 public void iterate(int start, int end, boolean needData, Inspector inspector) throws HgRuntimeException { |
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301 initOutline(); |
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302 final int indexSize = revisionCount(); |
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303 if (indexSize == 0) { |
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304 return; |
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305 } |
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306 if (end == TIP) { |
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307 end = indexSize - 1; |
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308 } |
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309 if (start == TIP) { |
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310 start = indexSize - 1; |
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311 } |
300
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312 HgInternals.checkRevlogRange(start, end, indexSize-1); |
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313 // XXX may cache [start .. end] from index with a single read (pre-read) |
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314 |
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315 ReaderN1 r = new ReaderN1(needData, inspector, repo.shallMergePatches()); |
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316 try { |
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317 r.start(end - start + 1, getLastRevisionRead()); |
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318 r.range(start, end); |
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319 } catch (IOException ex) { |
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320 throw new HgInvalidControlFileException(String.format("Failed reading [%d..%d]", start, end), ex, indexFile); |
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321 } finally { |
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322 CachedRevision cr = r.finish(); |
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323 setLastRevisionRead(cr); |
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324 } |
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325 } |
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326 |
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327 /** |
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328 * Effective alternative to {@link #iterate(int, int, boolean, Inspector) batch read}, when only few selected |
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329 * revisions are of interest. |
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330 * @param sortedRevisions revisions to walk, in ascending order. |
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331 * @param needData whether inspector needs access to header only |
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332 * @param inspector callback to process entries |
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333 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em> |
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334 */ |
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335 public void iterate(int[] sortedRevisions, boolean needData, Inspector inspector) throws HgRuntimeException { |
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336 final int indexSize = revisionCount(); |
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337 if (indexSize == 0 || sortedRevisions.length == 0) { |
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338 return; |
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339 } |
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340 if (sortedRevisions[0] > indexSize) { |
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341 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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342 } |
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343 if (sortedRevisions[sortedRevisions.length - 1] > indexSize) { |
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344 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]); |
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345 } |
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346 |
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347 ReaderN1 r = new ReaderN1(needData, inspector, repo.shallMergePatches()); |
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348 try { |
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349 r.start(sortedRevisions.length, getLastRevisionRead()); |
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350 for (int i = 0; i < sortedRevisions.length; ) { |
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351 int x = i; |
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352 i++; |
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353 while (i < sortedRevisions.length) { |
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354 if (sortedRevisions[i] == sortedRevisions[i-1] + 1) { |
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355 i++; |
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356 } else { |
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357 break; |
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358 } |
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359 } |
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360 // commitRevisions[x..i-1] are sequential |
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361 if (!r.range(sortedRevisions[x], sortedRevisions[i-1])) { |
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362 return; |
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363 } |
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364 } |
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365 } catch (IOException ex) { |
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366 final int c = sortedRevisions.length; |
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367 throw new HgInvalidControlFileException(String.format("Failed reading %d revisions in [%d; %d]", c, sortedRevisions[0], sortedRevisions[c-1]), ex, indexFile); |
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368 } finally { |
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369 CachedRevision cr = r.finish(); |
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370 setLastRevisionRead(cr); |
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371 } |
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372 } |
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373 |
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374 public void attach(Observer listener) { |
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375 assert listener != null; |
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376 if (observers == null) { |
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377 observers = new ArrayList<Observer>(3); |
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378 } |
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379 observers.add(listener); |
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380 } |
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381 |
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382 public void detach(Observer listener) { |
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383 assert listener != null; |
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384 if (observers != null) { |
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385 observers.remove(listener); |
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386 } |
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387 } |
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388 |
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389 /* |
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390 * Note, this method IS NOT a replacement for Observer. It has to be invoked when the validity of any |
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391 * cache built using revision information is in doubt, but it provides reasonable value only till the |
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392 * first initOutline() to be invoked, i.e. in [change..revlog read operation] time frame. If your code |
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393 * accesses cached information without any prior explicit read operation, you shall consult this method |
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394 * if next read operation would in fact bring changed content. |
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395 * Observer is needed in addition to this method because any revlog read operation (e.g. Revlog#getLastRevision) |
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396 * would clear shallDropDerivedCaches(), and if code relies only on this method to clear its derived caches, |
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397 * it would miss the update. |
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398 */ |
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399 public boolean shallDropDerivedCaches() { |
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400 if (shallDropDerivedCaches) { |
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401 return shallDropDerivedCaches; |
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402 } |
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403 return shallDropDerivedCaches = changeTracker.hasChanged(indexFile); |
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404 } |
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405 |
539
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406 void revisionAdded(int revisionIndex, Nodeid revision, int baseRevisionIndex, long revisionOffset) throws HgInvalidControlFileException { |
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407 shallDropDerivedCaches = true; |
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408 if (!outlineCached()) { |
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409 return; |
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410 } |
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411 if (baseRevisions.length != revisionIndex) { |
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412 throw new HgInvalidControlFileException(String.format("New entry's index shall be %d, not %d", baseRevisions.length, revisionIndex), null, indexFile); |
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413 } |
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414 if (baseRevisionIndex < 0 || baseRevisionIndex > baseRevisions.length) { |
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415 // baseRevisionIndex MAY be == to baseRevisions.length, it's when new revision is based on itself |
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416 throw new HgInvalidControlFileException(String.format("Base revision index %d doesn't fit [0..%d] range", baseRevisionIndex, baseRevisions.length), null, indexFile); |
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417 } |
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418 assert revision != null; |
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419 assert !revision.isNull(); |
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420 // next effort doesn't seem to be of any value at least in case of regular commit |
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421 // as the next call to #initOutline would recognize the file change and reload complete revlog anyway |
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422 // OTOH, there might be transaction strategy that doesn't update the file until its completion, |
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423 // while it's handy to know new revisions meanwhile. |
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424 int[] baseRevisionsCopy = new int[baseRevisions.length + 1]; |
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425 System.arraycopy(baseRevisions, 0, baseRevisionsCopy, 0, baseRevisions.length); |
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426 baseRevisionsCopy[baseRevisions.length] = baseRevisionIndex; |
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427 baseRevisions = baseRevisionsCopy; |
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428 if (inline && indexRecordOffset != null) { |
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429 assert indexRecordOffset.length == revisionIndex; |
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430 int[] indexRecordOffsetCopy = new int[indexRecordOffset.length + 1]; |
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431 System.arraycopy(indexRecordOffset, 0, indexRecordOffsetCopy, 0, indexRecordOffset.length); |
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432 indexRecordOffsetCopy[indexRecordOffset.length] = offsetFieldToInlineFileOffset(revisionOffset, revisionIndex); |
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433 indexRecordOffset = indexRecordOffsetCopy; |
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434 } |
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435 } |
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436 |
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437 private int getBaseRevision(int revision) { |
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438 return baseRevisions[revision]; |
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439 } |
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440 |
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441 /** |
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442 * @param revisionIndex shall be valid index, [0..baseRevisions.length-1]. |
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443 * It's advised to use {@link #checkRevisionIndex(int)} to ensure argument is correct. |
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444 * @return offset of the revision's record in the index (.i) stream |
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445 */ |
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446 private int getIndexOffsetInt(int revisionIndex) { |
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447 return inline ? indexRecordOffset[revisionIndex] : revisionIndex * REVLOGV1_RECORD_SIZE; |
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448 } |
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449 |
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450 private int checkRevisionIndex(int revisionIndex) throws HgInvalidControlFileException, HgInvalidRevisionException { |
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451 final int last = revisionCount() - 1; |
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452 if (revisionIndex == TIP) { |
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453 revisionIndex = last; |
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454 } |
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455 if (revisionIndex < 0 || revisionIndex > last) { |
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456 throw new HgInvalidRevisionException(revisionIndex).setRevisionIndex(revisionIndex, 0, last); |
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457 } |
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458 return revisionIndex; |
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459 } |
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460 |
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461 private boolean outlineCached() { |
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462 return baseRevisions != null && baseRevisions.length > 0; |
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463 } |
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464 |
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465 // translate 6-byte offset field value to physical file offset for inline revlogs |
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466 // DOESN'T MAKE SENSE if revlog with data is separate |
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467 private static int offsetFieldToInlineFileOffset(long offset, int recordIndex) throws HgInvalidStateException { |
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468 int o = Internals.ltoi(offset); |
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469 if (o != offset) { |
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470 // just in case, can't happen, ever, unless HG (or some other bad tool) produces index file |
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471 // with inlined data of size greater than 2 Gb. |
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472 throw new HgInvalidStateException("Data too big, offset didn't fit to sizeof(int)"); |
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473 } |
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474 return o + REVLOGV1_RECORD_SIZE * recordIndex; |
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475 } |
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476 |
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477 // every access to index revlog goes after this method only. |
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478 private void initOutline() throws HgInvalidControlFileException { |
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479 // true to send out 'drop-your-caches' event after outline has been built |
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480 final boolean notifyReload; |
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481 if (outlineCached()) { |
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482 if (!changeTracker.hasChanged(indexFile)) { |
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483 return; |
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484 } |
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485 notifyReload = true; |
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486 } else { |
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487 // no cached outline - inital read, do not send any reload/invalidate notifications |
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488 notifyReload = false; |
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489 } |
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490 changeTracker.touch(indexFile); |
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491 DataAccess da = getIndexStream(false); |
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492 try { |
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493 if (da.isEmpty()) { |
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494 // do not fail with exception if stream is empty, it's likely intentional |
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495 baseRevisions = new int[0]; |
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496 // empty revlog, likely to be populated, indicate we start with a single file |
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497 inline = true; |
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498 return; |
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499 } |
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500 int versionField = da.readInt(); |
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501 da.readInt(); // just to skip next 4 bytes of offset + flags |
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502 inline = (versionField & INLINEDATA) != 0; |
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503 IntVector resBases, resOffsets = null; |
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504 int entryCountGuess = Internals.ltoi(da.longLength() / REVLOGV1_RECORD_SIZE); |
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505 if (inline) { |
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506 entryCountGuess >>>= 2; // pure guess, assume useful data takes 3/4 of total space |
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507 resOffsets = new IntVector(entryCountGuess, 5000); |
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508 } |
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509 resBases = new IntVector(entryCountGuess, 5000); |
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510 |
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511 long offset = 0; // first offset is always 0, thus Hg uses it for other purposes |
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512 while(true) { |
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513 int compressedLen = da.readInt(); |
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514 // 8+4 = 12 bytes total read here |
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515 @SuppressWarnings("unused") |
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516 int actualLen = da.readInt(); |
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517 int baseRevision = da.readInt(); |
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518 // 12 + 8 = 20 bytes read here |
2
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519 // int linkRevision = di.readInt(); |
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520 // int parent1Revision = di.readInt(); |
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521 // int parent2Revision = di.readInt(); |
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522 // byte[] nodeid = new byte[32]; |
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523 resBases.add(baseRevision); |
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524 if (inline) { |
539
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525 int o = offsetFieldToInlineFileOffset(offset, resOffsets.size()); |
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526 resOffsets.add(o); |
9
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527 da.skip(3*4 + 32 + compressedLen); // Check: 44 (skip) + 20 (read) = 64 (total RevlogNG record size) |
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528 } else { |
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529 da.skip(3*4 + 32); |
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530 } |
10
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Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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531 if (da.isEmpty()) { |
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532 // fine, done then |
288
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533 baseRevisions = resBases.toArray(true); |
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534 if (inline) { |
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535 indexRecordOffset = resOffsets.toArray(true); |
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536 } |
9
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537 break; |
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538 } else { |
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539 // start reading next record |
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540 long l = da.readLong(); |
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541 offset = l >>> 16; |
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542 } |
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543 } |
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544 } catch (IOException ex) { |
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545 throw new HgInvalidControlFileException("Failed to analyze revlog index", ex, indexFile); |
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546 } finally { |
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547 da.done(); |
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548 if (notifyReload && observers != null) { |
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549 for (Observer l : observers) { |
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550 l.reloaded(this); |
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551 } |
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552 shallDropDerivedCaches = false; |
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553 } |
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554 } |
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555 } |
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556 |
593
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557 private CachedRevision getLastRevisionRead() { |
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558 return lastRevisionRead == null ? null : lastRevisionRead.get(); |
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559 } |
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560 |
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561 private void setLastRevisionRead(CachedRevision cr) { |
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562 // done() for lastRevisionRead.userData has been called by ReaderN1 once |
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563 // it noticed unsuitable DataAccess. |
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564 // Now, done() for any CachedRevision cleared by GC: |
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565 for (Reference<? extends CachedRevision> r; (r = lastRevisionQueue.poll()) != null;) { |
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566 CachedRevision toClean = r.get(); |
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567 if (toClean != null && toClean.userData != null) { |
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568 toClean.userData.done(); |
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569 } |
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570 } |
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571 if (cr != null) { |
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572 lastRevisionRead = new SoftReference<CachedRevision>(cr, lastRevisionQueue); |
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573 } else { |
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574 lastRevisionRead = null; |
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575 } |
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576 } |
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|
577 |
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578 final static class CachedRevision { |
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579 final int revision; |
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580 final DataAccess userData; |
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581 |
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582 public CachedRevision(int lastRevisionRead, DataAccess lastUserData) { |
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583 revision = lastRevisionRead; |
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584 userData = lastUserData; |
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585 } |
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586 } |
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587 |
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588 /** |
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589 * 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
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590 * XXX initOutline might need similar extraction to keep N1 format knowledge |
242
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591 */ |
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592 final class ReaderN1 { |
242
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593 private final Inspector inspector; |
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594 private final boolean needData; |
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595 private final boolean mergePatches; |
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596 private DataAccess daIndex = null, daData = null; |
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597 private Lifecycle.BasicCallback cb = null; |
520
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Experimental support for inverse direction history walking. Refactored/streamlined cancellation in HgLogCommand and down the stack
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598 private Lifecycle lifecycleListener = null; |
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599 private int lastRevisionRead = BAD_REVISION; |
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600 private DataAccess lastUserData; |
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601 // |
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602 // next are transient values, for range() use only |
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603 private final Inflater inflater = new Inflater(); |
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604 // can share buffer between instances of InflaterDataAccess as I never read any two of them in parallel |
608
e1b29756f901
Clean, organize and resolve some TODOs and FIXMEs: minor refactorings and comments
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parents:
607
diff
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605 private final byte[] inflaterBuffer = new byte[10 * 1024]; // TODO [post-1.1] consider using DAP.DEFAULT_FILE_BUFFER |
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606 private final byte[] nodeidBuf = new byte[20]; |
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607 // revlog record fields |
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608 private long offset; |
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609 @SuppressWarnings("unused") |
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610 private int flags; |
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611 private int compressedLen; |
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612 private int actualLen; |
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613 private int baseRevision; |
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614 private int linkRevision; |
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615 private int parent1Revision; |
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616 private int parent2Revision; |
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617 |
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618 public ReaderN1(boolean dataRequested, Inspector insp, boolean usePatchMerge) { |
242
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619 assert insp != null; |
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620 needData = dataRequested; |
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621 inspector = insp; |
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622 mergePatches = usePatchMerge; |
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623 } |
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624 |
593
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625 public void start(int totalWork, CachedRevision cachedRevision) { |
606
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626 daIndex = getIndexStream(totalWork <= 10); |
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627 if (needData && !inline) { |
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628 daData = getDataStream(); |
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629 } |
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630 lifecycleListener = Adaptable.Factory.getAdapter(inspector, Lifecycle.class, null); |
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631 if (lifecycleListener != null) { |
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632 cb = new Lifecycle.BasicCallback(); |
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633 lifecycleListener.start(totalWork, cb, cb); |
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634 } |
593
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635 if (needData && cachedRevision != null) { |
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636 lastUserData = cachedRevision.userData; |
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637 lastRevisionRead = cachedRevision.revision; |
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638 assert lastUserData != null; |
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639 } |
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640 } |
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641 |
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642 // invoked only once per instance |
593
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643 public CachedRevision finish() { |
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644 CachedRevision rv = null; |
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645 if (lastUserData != null) { |
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646 if (lastUserData instanceof ByteArrayDataAccess) { |
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647 // it's safe to cache only in-memory revision texts, |
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648 // if lastUserData is merely a filter over file stream, |
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649 // we'd need to keep file open, and this is bad. |
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650 // XXX perhaps, wrap any DataAccess.byteArray into |
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651 // ByteArrayDataAccess? |
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652 rv = new CachedRevision(lastRevisionRead, lastUserData); |
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653 } else { |
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654 lastUserData.done(); |
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655 } |
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656 lastUserData = null; |
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657 } |
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658 if (lifecycleListener != null) { |
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659 lifecycleListener.finish(cb); |
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660 lifecycleListener = null; |
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661 cb = null; |
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662 |
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663 } |
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664 daIndex.done(); |
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665 if (daData != null) { |
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666 daData.done(); |
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667 daData = null; |
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668 } |
593
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669 return rv; |
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670 } |
584
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671 |
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672 private void readHeaderRecord(int i) throws IOException { |
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673 if (inline && needData) { |
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674 // inspector reading data (though FilterDataAccess) may have affected index position |
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675 daIndex.seek(getIndexOffsetInt(i)); |
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676 } |
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677 long l = daIndex.readLong(); // 0 |
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678 offset = i == 0 ? 0 : (l >>> 16); |
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679 flags = (int) (l & 0x0FFFF); |
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680 compressedLen = daIndex.readInt(); // +8 |
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681 actualLen = daIndex.readInt(); // +12 |
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682 baseRevision = daIndex.readInt(); // +16 |
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683 linkRevision = daIndex.readInt(); // +20 |
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684 parent1Revision = daIndex.readInt(); |
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685 parent2Revision = daIndex.readInt(); |
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686 // Hg has 32 bytes here, uses 20 for nodeid, and keeps 12 last bytes empty |
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687 daIndex.readBytes(nodeidBuf, 0, 20); // +32 |
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688 daIndex.skip(12); |
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689 } |
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690 |
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691 private boolean isPatch(int i) { |
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692 return baseRevision != i; // the only way I found to tell if it's a patch |
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693 } |
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694 |
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695 private DataAccess getStoredData(int i) throws IOException { |
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696 DataAccess userDataAccess = null; |
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697 DataAccess streamDataAccess; |
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698 long streamOffset; |
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699 if (inline) { |
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700 streamOffset = getIndexOffsetInt(i) + REVLOGV1_RECORD_SIZE; |
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701 streamDataAccess = daIndex; |
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702 // don't need to do seek as it's actual position in the index stream, but it's safe to seek, just in case |
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703 daIndex.longSeek(streamOffset); |
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704 } else { |
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705 streamOffset = offset; |
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706 streamDataAccess = daData; |
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707 daData.longSeek(streamOffset); |
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708 } |
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709 if (streamDataAccess.isEmpty() || compressedLen == 0) { |
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710 userDataAccess = new DataAccess(); // empty |
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711 } else { |
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712 final byte firstByte = streamDataAccess.readByte(); |
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713 if (firstByte == 0x78 /* 'x' */) { |
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714 inflater.reset(); |
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715 userDataAccess = new InflaterDataAccess(streamDataAccess, streamOffset, compressedLen, isPatch(i) ? -1 : actualLen, inflater, inflaterBuffer); |
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716 } else if (firstByte == 0x75 /* 'u' */) { |
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717 userDataAccess = new FilterDataAccess(streamDataAccess, streamOffset+1, compressedLen-1); |
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718 } else { |
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719 // 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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720 // |
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721 // although firstByte is already read from the streamDataAccess, FilterDataAccess#readByte would seek to |
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722 // initial offset before first attempt to read a byte |
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723 userDataAccess = new FilterDataAccess(streamDataAccess, streamOffset, compressedLen); |
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724 } |
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725 } |
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726 return userDataAccess; |
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727 } |
263
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728 |
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729 // may be invoked few times per instance life |
628
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730 public boolean range(int start, int end) throws IOException, HgRuntimeException { |
242
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731 int i; |
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732 // it (i.e. replace with i >= start) |
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733 if (needData && (i = getBaseRevision(start)) < start) { |
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734 // if lastRevisionRead in [baseRevision(start), start) can reuse lastUserData |
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735 // doesn't make sense to reuse if lastRevisionRead == start (too much to change in the cycle below). |
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736 if (lastRevisionRead != BAD_REVISION && i <= lastRevisionRead && lastRevisionRead < start) { |
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737 i = lastRevisionRead + 1; // start with first not-yet-read revision |
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738 } else { |
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739 if (lastUserData != null) { |
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740 lastUserData.done(); |
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741 lastUserData = null; |
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742 } |
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743 } |
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744 } else { |
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745 // don't need to clean lastUserData as it's always null when !needData |
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746 i = start; |
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747 } |
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748 |
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749 daIndex.seek(getIndexOffsetInt(i)); |
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750 // |
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751 // reuse instance, do not normalize it as patches from the stream are unlikely to need it |
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752 final Patch patch = new Patch(false); |
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753 // |
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754 if (needData && mergePatches && start-i > 2) { |
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755 // i+1 == start just reads lastUserData, i+2 == start applies one patch - not worth dedicated effort |
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756 Patch ultimatePatch = new Patch(true); |
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757 for ( ; i < start; i++) { |
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758 readHeaderRecord(i); |
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759 DataAccess userDataAccess = getStoredData(i); |
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760 if (lastUserData == null) { |
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761 assert !isPatch(i); |
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762 lastUserData = userDataAccess; |
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763 } else { |
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764 assert isPatch(i); // i < start and i == getBaseRevision() |
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765 patch.read(userDataAccess); |
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766 userDataAccess.done(); |
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767 // I assume empty patches are applied ok |
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768 ultimatePatch = ultimatePatch.apply(patch); |
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769 patch.clear(); |
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770 } |
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771 } |
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772 lastUserData.reset(); |
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773 byte[] userData = ultimatePatch.apply(lastUserData, actualLen); |
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774 ultimatePatch.clear(); |
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775 lastUserData.done(); |
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776 lastUserData = new ByteArrayDataAccess(userData); |
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777 } |
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778 // |
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779 |
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780 for (; i <= end; i++ ) { |
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781 readHeaderRecord(i); |
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782 DataAccess userDataAccess = null; |
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783 if (needData) { |
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784 userDataAccess = getStoredData(i); |
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785 // userDataAccess is revision content, either complete revision, patch of a previous content, or an empty patch |
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786 if (isPatch(i)) { |
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787 // this is a patch |
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788 if (userDataAccess.isEmpty()) { |
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789 // Issue 22, empty patch to an empty base revision |
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790 // Issue 24, empty patch to non-empty base revision |
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791 // empty patch modifies nothing, use content of a previous revision (shall present - it's a patch here) |
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792 // |
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793 assert lastUserData.length() == actualLen; // with no patch, data size shall be the same |
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794 userDataAccess = lastUserData; |
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795 } else { |
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796 patch.read(userDataAccess); |
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797 userDataAccess.done(); |
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798 // |
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799 // it shall be reset at the end of prev iteration, when it got assigned from userDataAccess |
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800 // however, actual userDataAccess and lastUserData may share Inflater object, which needs to be reset |
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801 // Alternatively, userDataAccess.done() above may be responsible to reset Inflater (if it's InflaterDataAccess) |
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802 lastUserData.reset(); |
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803 // final long startMeasuring = System.currentTimeMillis(); // TIMING |
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804 byte[] userData = patch.apply(lastUserData, actualLen); |
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805 // applyTime += (System.currentTimeMillis() - startMeasuring); // TIMING |
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806 patch.clear(); // do not keep any reference, allow byte[] data to be gc'd |
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807 userDataAccess = new ByteArrayDataAccess(userData); |
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808 } |
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809 } |
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810 } else { |
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811 if (inline) { |
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812 daIndex.skip(compressedLen); |
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813 } |
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814 } |
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815 if (i >= start) { |
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816 // final long startMeasuring = System.currentTimeMillis(); // TIMING |
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817 inspector.next(i, actualLen, baseRevision, linkRevision, parent1Revision, parent2Revision, nodeidBuf, userDataAccess); |
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818 // inspectorTime += (System.currentTimeMillis() - startMeasuring); // TIMING |
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819 } |
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820 if (cb != null) { |
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821 if (cb.isStopped()) { |
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822 return false; |
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823 } |
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824 } |
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825 if (userDataAccess != null) { |
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826 userDataAccess.reset(); // not sure this is necessary here, as lastUserData would get reset anyway before next use. |
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827 } |
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828 if (lastUserData != null && lastUserData != userDataAccess /* empty patch case, reuse of recent data in actual revision */) { |
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829 // release lastUserData only if we didn't reuse it in actual revision due to empty patch: |
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830 // 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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831 lastUserData.done(); |
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832 } |
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833 lastUserData = userDataAccess; |
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834 } |
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835 lastRevisionRead = end; |
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836 return true; |
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837 } |
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838 } |
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839 |
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840 |
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841 public interface Inspector { |
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842 /** |
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843 * XXX boolean retVal to indicate whether to continue? |
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844 * |
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845 * Implementers shall not invoke DataAccess.done(), it's accomplished by #iterate at appropriate moment |
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846 * |
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847 * @param revisionIndex absolute index of revision in revlog being iterated |
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848 * @param actualLen length of the user data at this revision |
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849 * @param baseRevision last revision known to hold complete revision (other hold patches). |
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850 * if baseRevision != revisionIndex, data for this revision is a result of a sequence of patches |
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851 * @param linkRevision index of corresponding changeset revision |
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852 * @param parent1Revision index of first parent revision in this revlog, or {@link HgRepository#NO_REVISION} |
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853 * @param parent2Revision index of second parent revision in this revlog, or {@link HgRepository#NO_REVISION} |
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854 * @param nodeid 20-byte buffer, shared between invocations |
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855 * @param data access to revision content of actualLen size, or <code>null</code> if no data has been requested with |
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856 * {@link RevlogStream#iterate(int[], boolean, Inspector)} |
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857 */ |
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858 void next(int revisionIndex, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[/*20*/] nodeid, DataAccess data) throws HgRuntimeException; |
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859 } |
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860 |
607
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861 public interface Observer { |
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862 // notify observer of invalidate/reload event in the stream |
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863 public void reloaded(RevlogStream src); |
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864 } |
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865 } |