annotate src/org/tmatesoft/hg/internal/RevlogStream.java @ 686:f1f095e42555

Annotated file is not always changed in the latest changeset, need to find out last changest it was changed at (iow, diffed to with BlameHelper)
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 25 Jul 2013 22:12:14 +0200 (2013-07-25)
parents ae2d439fbed3
children
rev   line source
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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.NO_REVISION;
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21 import static org.tmatesoft.hg.repo.HgRepository.TIP;
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22 import static org.tmatesoft.hg.internal.Internals.REVLOGV1_RECORD_SIZE;
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24 import java.io.File;
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25 import java.io.IOException;
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26 import java.lang.ref.Reference;
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27 import java.lang.ref.ReferenceQueue;
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28 import java.lang.ref.SoftReference;
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29 import java.nio.ByteBuffer;
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30 import java.util.ArrayList;
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31 import java.util.List;
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32 import java.util.zip.Inflater;
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34 import org.tmatesoft.hg.core.HgIOException;
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35 import org.tmatesoft.hg.core.Nodeid;
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36 import org.tmatesoft.hg.repo.HgInternals;
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37 import org.tmatesoft.hg.repo.HgInvalidControlFileException;
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38 import org.tmatesoft.hg.repo.HgInvalidRevisionException;
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39 import org.tmatesoft.hg.repo.HgInvalidStateException;
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40 import org.tmatesoft.hg.repo.HgRepository;
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41 import org.tmatesoft.hg.repo.HgRuntimeException;
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42 import org.tmatesoft.hg.util.Adaptable;
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45 /**
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46 * ? Single RevlogStream per file per repository with accessor to record access session (e.g. with back/forward operations),
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47 * or numerous RevlogStream with separate representation of the underlying data (cached, lazy ChunkStream)?
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48 *
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49 * @see http://mercurial.selenic.com/wiki/Revlog
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50 * @see http://mercurial.selenic.com/wiki/RevlogNG
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51 *
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52 * @author Artem Tikhomirov
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53 * @author TMate Software Ltd.
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54 */
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55 public class RevlogStream {
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57 static final int INLINEDATA = 1 << 16;
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59 /*
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60 * 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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61 *
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62 * long[] in fact (there are 8-bytes field in the revlog)
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63 * However, (a) DataAccess currently doesn't operate with long seek/length
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64 * and, of greater significance, (b) files with inlined data are designated for smaller files,
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65 * guess, about 130 Kb, and offset there won't ever break int capacity
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66 */
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67 private int[] indexRecordOffset;
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68 private int[] baseRevisions;
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69 private boolean inline = false;
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70 private final File indexFile;
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71 private File dataFile;
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72 private final Internals repo;
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73 // keeps last complete revision we've read. Note, this cached revision doesn't help
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74 // for subsequent #iterate() calls with the same revision (Inspector needs more data than
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75 // we currently cache here, perhaps, we shall cache everything it wants to cover same
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76 // revision case as well). Now this helps when second #iterate() call is for a revision greater
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77 // than one from the first call, and both revisions got same base rev. It's often the case when
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78 // parents/children are analyzed.
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79 private SoftReference<CachedRevision> lastRevisionRead;
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80 private final ReferenceQueue<CachedRevision> lastRevisionQueue = new ReferenceQueue<CachedRevision>();
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81 //
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82 private final RevlogChangeMonitor changeTracker;
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83 private List<Observer> observers;
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84 private boolean shallDropDerivedCaches = false;
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86 public RevlogStream(Internals hgRepo, File indexFile) {
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87 repo = hgRepo;
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88 this.indexFile = indexFile;
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89 changeTracker = repo.getRevlogTracker(indexFile);
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90 }
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92 public boolean exists() {
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93 return indexFile.exists();
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94 }
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96 /**
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97 * @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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98 * @return never <code>null</code>, empty {@link DataAccess} if no stream is available
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99 */
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100 /*package*/ DataAccess getIndexStream(boolean shortRead) {
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101 // shortRead hint helps to avoid mmap files when only
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102 // few bytes are to be read (i.e. #dataLength())
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103 DataAccessProvider dataAccess = repo.getDataAccess();
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104 return dataAccess.createReader(indexFile, shortRead);
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105 }
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106
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107 /*package*/ DataAccess getDataStream() {
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108 DataAccessProvider dataAccess = repo.getDataAccess();
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109 return dataAccess.createReader(getDataFile(), false);
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110 }
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111
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112 /*package*/ DataSerializer getIndexStreamWriter(Transaction tr) throws HgIOException {
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113 DataAccessProvider dataAccess = repo.getDataAccess();
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114 return dataAccess.createWriter(tr, indexFile, true);
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115 }
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116
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117 /*package*/ DataSerializer getDataStreamWriter(Transaction tr) throws HgIOException {
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118 DataAccessProvider dataAccess = repo.getDataAccess();
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119 return dataAccess.createWriter(tr, getDataFile(), true);
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120 }
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121
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122 /**
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123 * Constructs file object that corresponds to .d revlog counterpart.
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124 * Note, it's caller responsibility to ensure this file makes any sense (i.e. check {@link #inline} attribute)
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125 */
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126 private File getDataFile() {
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127 if (dataFile == null) {
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128 final String indexName = indexFile.getName();
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129 dataFile = new File(indexFile.getParentFile(), indexName.substring(0, indexName.length() - 1) + "d");
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130 }
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131 return dataFile;
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132 }
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133
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134 // initialize exception with the file where revlog structure information comes from
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135 public HgInvalidControlFileException initWithIndexFile(HgInvalidControlFileException ex) {
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136 return ex.setFile(indexFile);
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137 }
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138
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139 public HgIOException initWithIndexFile(HgIOException ex) {
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140 return ex.setFile(indexFile);
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141 }
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142
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143 // initialize exception with the file where revlog data comes from
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144 public HgInvalidControlFileException initWithDataFile(HgInvalidControlFileException ex) {
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145 // exceptions are usually raised after read attepmt, hence inline shall be initialized
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146 // although honest approach is to call #initOutline() first
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147 return ex.setFile(inline ? indexFile : getDataFile());
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148 }
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149
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150 /*package-private*/String getDataFileName() {
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151 // XXX a temporary solution to provide more info to fill in exceptions other than
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152 // HgInvalidControlFileException (those benefit from initWith* methods above)
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153 //
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154 // Besides, since RevlogStream represents both revlogs with user data (those with WC representative and
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155 // system data under store/data) and system-only revlogs (like changelog and manifest), there's no
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156 // easy way to supply human-friendly name of the active file (independent from whether it's index of data)
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157 return inline ? indexFile.getPath() : getDataFile().getPath();
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158 }
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159
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160 public boolean isInlineData() throws HgInvalidControlFileException {
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161 initOutline();
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162 return inline;
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163 }
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164
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165 public int revisionCount() throws HgInvalidControlFileException {
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166 initOutline();
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167 return baseRevisions.length;
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168 }
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169
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170 /**
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171 * @throws HgInvalidControlFileException if attempt to read index file failed
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172 * @throws HgInvalidRevisionException if revisionIndex argument doesn't represent a valid record in the revlog
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173 */
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174 public int dataLength(int revisionIndex) throws HgInvalidControlFileException, HgInvalidRevisionException {
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175 // XXX in fact, use of iterate() instead of this implementation may be quite reasonable.
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176 //
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177 revisionIndex = checkRevisionIndex(revisionIndex);
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178 DataAccess daIndex = getIndexStream(true);
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179 try {
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180 int recordOffset = getIndexOffsetInt(revisionIndex);
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181 daIndex.seek(recordOffset + 12); // 6+2+4
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182 int actualLen = daIndex.readInt();
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183 return actualLen;
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184 } catch (IOException ex) {
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185 throw new HgInvalidControlFileException(null, ex, indexFile).setRevisionIndex(revisionIndex);
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186 } finally {
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187 daIndex.done();
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188 }
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189 }
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190
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191 /**
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192 * Read nodeid at given index
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193 *
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194 * @throws HgInvalidControlFileException if attempt to read index file failed
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195 * @throws HgInvalidRevisionException if revisionIndex argument doesn't represent a valid record in the revlog
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196 */
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197 public byte[] nodeid(int revisionIndex) throws HgInvalidControlFileException, HgInvalidRevisionException {
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198 revisionIndex = checkRevisionIndex(revisionIndex);
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199 DataAccess daIndex = getIndexStream(true);
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200 try {
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201 int recordOffset = getIndexOffsetInt(revisionIndex);
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202 daIndex.seek(recordOffset + 32);
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203 byte[] rv = new byte[20];
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204 daIndex.readBytes(rv, 0, 20);
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205 return rv;
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206 } catch (IOException ex) {
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207 throw new HgInvalidControlFileException("Revision lookup failed", ex, indexFile).setRevisionIndex(revisionIndex);
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208 } finally {
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209 daIndex.done();
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210 }
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211 }
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212
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213 /**
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214 * Get link field from the index record.
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215 *
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216 * @throws HgInvalidControlFileException if attempt to read index file failed
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217 * @throws HgInvalidRevisionException if revisionIndex argument doesn't represent a valid record in the revlog
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218 */
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219 public int linkRevision(int revisionIndex) throws HgInvalidControlFileException, HgInvalidRevisionException {
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220 revisionIndex = checkRevisionIndex(revisionIndex);
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221 DataAccess daIndex = getIndexStream(true);
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222 try {
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223 int recordOffset = getIndexOffsetInt(revisionIndex);
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224 daIndex.seek(recordOffset + 20);
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225 int linkRev = daIndex.readInt();
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226 return linkRev;
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227 } catch (IOException ex) {
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228 throw new HgInvalidControlFileException("Linked revision lookup failed", ex, indexFile).setRevisionIndex(revisionIndex);
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229 } finally {
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230 daIndex.done();
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231 }
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232 }
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233
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234 /**
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235 * Extract base revision field from the revlog
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236 *
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237 * @throws HgInvalidControlFileException if attempt to read index file failed
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238 * @throws HgInvalidRevisionException if revisionIndex argument doesn't represent a valid record in the revlog
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239 */
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240 public int baseRevision(int revisionIndex) throws HgInvalidControlFileException, HgInvalidRevisionException {
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241 revisionIndex = checkRevisionIndex(revisionIndex);
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242 return getBaseRevision(revisionIndex);
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243 }
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244
644
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245 /**
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246 * Read indexes of parent revisions
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247 * @param revisionIndex index of child revision
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248 * @param parents array to hold return value, length >= 2
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249 * @return value of <code>parents</code> parameter for convenience
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250 * @throws HgInvalidControlFileException if attempt to read index file failed
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251 * @throws HgInvalidRevisionException if revisionIndex argument doesn't represent a valid record in the revlog
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252 */
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253 public int[] parents(int revisionIndex, int[] parents) throws HgInvalidControlFileException, HgInvalidRevisionException {
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254 assert parents.length > 1;
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255 revisionIndex = checkRevisionIndex(revisionIndex);
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256 DataAccess daIndex = getIndexStream(true);
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257 try {
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258 int recordOffset = getIndexOffsetInt(revisionIndex);
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259 daIndex.seek(recordOffset + 24);
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260 int p1 = daIndex.readInt();
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261 int p2 = daIndex.readInt();
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262 // although NO_REVISION == -1, it doesn't hurt to ensure this
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263 parents[0] = p1 == -1 ? NO_REVISION : p1;
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264 parents[1] = p2 == -1 ? NO_REVISION : p2;
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265 return parents;
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266 } catch (IOException ex) {
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267 throw new HgInvalidControlFileException("Parents lookup failed", ex, indexFile).setRevisionIndex(revisionIndex);
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268 } finally {
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269 daIndex.done();
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270 }
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271 }
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272
49
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273 // Perhaps, RevlogStream should be limited to use of plain int revisions for access,
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274 // while Nodeids should be kept on the level up, in Revlog. Guess, Revlog better keep
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275 // map of nodeids, and once this comes true, we may get rid of this method.
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276 // Unlike its counterpart, {@link Revlog#getLocalRevisionNumber()}, doesn't fail with exception if node not found,
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277 /**
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278 * @return integer in [0..revisionCount()) or {@link HgRepository#BAD_REVISION} if not found
354
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279 * @throws HgInvalidControlFileException if attempt to read index file failed
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280 */
367
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281 public int findRevisionIndex(Nodeid nodeid) throws HgInvalidControlFileException {
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282 // XXX this one may be implemented with iterate() once there's mechanism to stop iterations
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283 final int indexSize = revisionCount();
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284 DataAccess daIndex = getIndexStream(false);
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285 try {
24
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286 byte[] nodeidBuf = new byte[20];
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287 for (int i = 0; i < indexSize; i++) {
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288 daIndex.skip(8);
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289 int compressedLen = daIndex.readInt();
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290 daIndex.skip(20);
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291 daIndex.readBytes(nodeidBuf, 0, 20);
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292 if (nodeid.equalsTo(nodeidBuf)) {
22
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293 return i;
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294 }
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295 daIndex.skip(inline ? 12 + compressedLen : 12);
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296 }
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297 } catch (IOException ex) {
440
299870249a28 Issue 30: bogus IOException for mmap file on linux
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298 throw new HgInvalidControlFileException("Revision lookup failed", ex, indexFile).setRevision(nodeid);
22
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299 } finally {
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300 daIndex.done();
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301 }
80
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diff changeset
302 return BAD_REVISION;
22
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303 }
538
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304
539
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305 /**
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306 * @return value suitable for the corresponding field in the new revision's header, not physical offset in the file
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307 * (which is different in case of inline revlogs)
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diff changeset
308 */
628
6526d8adbc0f Explicit HgRuntimeException to facilitate easy switch from runtime to checked exceptions
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diff changeset
309 public long newEntryOffset() throws HgInvalidControlFileException {
538
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diff changeset
310 if (revisionCount() == 0) {
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diff changeset
311 return 0;
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312 }
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313 DataAccess daIndex = getIndexStream(true);
538
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diff changeset
314 int lastRev = revisionCount() - 1;
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315 try {
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316 int recordOffset = getIndexOffsetInt(lastRev);
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317 daIndex.seek(recordOffset);
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318 long value = daIndex.readLong();
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319 value = value >>> 16;
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320 int compressedLen = daIndex.readInt();
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321 return lastRev == 0 ? compressedLen : value + compressedLen;
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322 } catch (IOException ex) {
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323 throw new HgInvalidControlFileException("Linked revision lookup failed", ex, indexFile).setRevisionIndex(lastRev);
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324 } finally {
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325 daIndex.done();
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326 }
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327 }
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diff changeset
328
628
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329 /**
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330 * should be possible to use TIP, ALL, or -1, -2, -n notation of Hg
6526d8adbc0f Explicit HgRuntimeException to facilitate easy switch from runtime to checked exceptions
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diff changeset
331 * ? boolean needsNodeid
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diff changeset
332 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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diff changeset
333 */
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diff changeset
334 public void iterate(int start, int end, boolean needData, Inspector inspector) throws HgRuntimeException {
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335 initOutline();
198
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
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diff changeset
336 final int indexSize = revisionCount();
3
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diff changeset
337 if (indexSize == 0) {
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diff changeset
338 return;
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339 }
5
fc265ddeab26 File content and non-effective, although working, patch application
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340 if (end == TIP) {
3
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diff changeset
341 end = indexSize - 1;
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diff changeset
342 }
5
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343 if (start == TIP) {
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diff changeset
344 start = indexSize - 1;
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diff changeset
345 }
300
650b45d290b1 Share range check code
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diff changeset
346 HgInternals.checkRevlogRange(start, end, indexSize-1);
2
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diff changeset
347 // XXX may cache [start .. end] from index with a single read (pre-read)
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diff changeset
348
608
e1b29756f901 Clean, organize and resolve some TODOs and FIXMEs: minor refactorings and comments
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diff changeset
349 ReaderN1 r = new ReaderN1(needData, inspector, repo.shallMergePatches());
2
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diff changeset
350 try {
593
9619301a7bb9 Share last revision read between #iterate() invocations, to save revision rebuild efforts when few subsequent revisions are read
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diff changeset
351 r.start(end - start + 1, getLastRevisionRead());
242
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diff changeset
352 r.range(start, end);
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diff changeset
353 } catch (IOException ex) {
366
189dc6dc1c3e Use exceptions to expose errors reading mercurial data
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parents: 354
diff changeset
354 throw new HgInvalidControlFileException(String.format("Failed reading [%d..%d]", start, end), ex, indexFile);
242
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diff changeset
355 } finally {
593
9619301a7bb9 Share last revision read between #iterate() invocations, to save revision rebuild efforts when few subsequent revisions are read
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diff changeset
356 CachedRevision cr = r.finish();
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diff changeset
357 setLastRevisionRead(cr);
242
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diff changeset
358 }
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diff changeset
359 }
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diff changeset
360
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diff changeset
361 /**
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diff changeset
362 * Effective alternative to {@link #iterate(int, int, boolean, Inspector) batch read}, when only few selected
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diff changeset
363 * revisions are of interest.
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diff changeset
364 * @param sortedRevisions revisions to walk, in ascending order.
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diff changeset
365 * @param needData whether inspector needs access to header only
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diff changeset
366 * @param inspector callback to process entries
628
6526d8adbc0f Explicit HgRuntimeException to facilitate easy switch from runtime to checked exceptions
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diff changeset
367 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
242
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diff changeset
368 */
628
6526d8adbc0f Explicit HgRuntimeException to facilitate easy switch from runtime to checked exceptions
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diff changeset
369 public void iterate(int[] sortedRevisions, boolean needData, Inspector inspector) throws HgRuntimeException {
242
ad6a046943be Improved reading of sparse revisions from a revlog
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diff changeset
370 final int indexSize = revisionCount();
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diff changeset
371 if (indexSize == 0 || sortedRevisions.length == 0) {
ad6a046943be Improved reading of sparse revisions from a revlog
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diff changeset
372 return;
ad6a046943be Improved reading of sparse revisions from a revlog
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diff changeset
373 }
347
8da7ade36c57 Add specific IAE subclass to handle wrong (e.g. outdated after rollback) revisions
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diff changeset
374 if (sortedRevisions[0] > indexSize) {
8da7ade36c57 Add specific IAE subclass to handle wrong (e.g. outdated after rollback) revisions
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diff changeset
375 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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diff changeset
376 }
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diff changeset
377 if (sortedRevisions[sortedRevisions.length - 1] > indexSize) {
8da7ade36c57 Add specific IAE subclass to handle wrong (e.g. outdated after rollback) revisions
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diff changeset
378 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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diff changeset
379 }
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diff changeset
380
608
e1b29756f901 Clean, organize and resolve some TODOs and FIXMEs: minor refactorings and comments
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parents: 607
diff changeset
381 ReaderN1 r = new ReaderN1(needData, inspector, repo.shallMergePatches());
242
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diff changeset
382 try {
594
cc7b0c4dc993 Cache only in-memory revision representations
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diff changeset
383 r.start(sortedRevisions.length, getLastRevisionRead());
242
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diff changeset
384 for (int i = 0; i < sortedRevisions.length; ) {
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diff changeset
385 int x = i;
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diff changeset
386 i++;
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diff changeset
387 while (i < sortedRevisions.length) {
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diff changeset
388 if (sortedRevisions[i] == sortedRevisions[i-1] + 1) {
ad6a046943be Improved reading of sparse revisions from a revlog
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diff changeset
389 i++;
2
08db726a0fb7 Shaping out low-level Hg structures
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diff changeset
390 } else {
217
e39cf474ef94 Experimental support to mix-in start and end events for inspectors. Additionally, Lifecycle may serve as iteration control
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parents: 202
diff changeset
391 break;
e39cf474ef94 Experimental support to mix-in start and end events for inspectors. Additionally, Lifecycle may serve as iteration control
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diff changeset
392 }
e39cf474ef94 Experimental support to mix-in start and end events for inspectors. Additionally, Lifecycle may serve as iteration control
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diff changeset
393 }
242
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diff changeset
394 // commitRevisions[x..i-1] are sequential
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diff changeset
395 if (!r.range(sortedRevisions[x], sortedRevisions[i-1])) {
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diff changeset
396 return;
51
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 49
diff changeset
397 }
2
08db726a0fb7 Shaping out low-level Hg structures
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parents: 0
diff changeset
398 }
08db726a0fb7 Shaping out low-level Hg structures
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parents: 0
diff changeset
399 } catch (IOException ex) {
366
189dc6dc1c3e Use exceptions to expose errors reading mercurial data
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diff changeset
400 final int c = sortedRevisions.length;
608
e1b29756f901 Clean, organize and resolve some TODOs and FIXMEs: minor refactorings and comments
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parents: 607
diff changeset
401 throw new HgInvalidControlFileException(String.format("Failed reading %d revisions in [%d; %d]", c, sortedRevisions[0], sortedRevisions[c-1]), ex, indexFile);
3
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
402 } finally {
593
9619301a7bb9 Share last revision read between #iterate() invocations, to save revision rebuild efforts when few subsequent revisions are read
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 585
diff changeset
403 CachedRevision cr = r.finish();
9619301a7bb9 Share last revision read between #iterate() invocations, to save revision rebuild efforts when few subsequent revisions are read
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 585
diff changeset
404 setLastRevisionRead(cr);
2
08db726a0fb7 Shaping out low-level Hg structures
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parents: 0
diff changeset
405 }
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
406 }
607
66f1cc23b906 Refresh revlogs if a change to a file has been detected; do not force reload of the whole repository
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 606
diff changeset
407
66f1cc23b906 Refresh revlogs if a change to a file has been detected; do not force reload of the whole repository
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parents: 606
diff changeset
408 public void attach(Observer listener) {
66f1cc23b906 Refresh revlogs if a change to a file has been detected; do not force reload of the whole repository
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parents: 606
diff changeset
409 assert listener != null;
66f1cc23b906 Refresh revlogs if a change to a file has been detected; do not force reload of the whole repository
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parents: 606
diff changeset
410 if (observers == null) {
66f1cc23b906 Refresh revlogs if a change to a file has been detected; do not force reload of the whole repository
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parents: 606
diff changeset
411 observers = new ArrayList<Observer>(3);
66f1cc23b906 Refresh revlogs if a change to a file has been detected; do not force reload of the whole repository
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parents: 606
diff changeset
412 }
66f1cc23b906 Refresh revlogs if a change to a file has been detected; do not force reload of the whole repository
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parents: 606
diff changeset
413 observers.add(listener);
66f1cc23b906 Refresh revlogs if a change to a file has been detected; do not force reload of the whole repository
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parents: 606
diff changeset
414 }
66f1cc23b906 Refresh revlogs if a change to a file has been detected; do not force reload of the whole repository
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parents: 606
diff changeset
415
66f1cc23b906 Refresh revlogs if a change to a file has been detected; do not force reload of the whole repository
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parents: 606
diff changeset
416 public void detach(Observer listener) {
66f1cc23b906 Refresh revlogs if a change to a file has been detected; do not force reload of the whole repository
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parents: 606
diff changeset
417 assert listener != null;
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parents: 606
diff changeset
418 if (observers != null) {
66f1cc23b906 Refresh revlogs if a change to a file has been detected; do not force reload of the whole repository
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parents: 606
diff changeset
419 observers.remove(listener);
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parents: 606
diff changeset
420 }
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parents: 606
diff changeset
421 }
66f1cc23b906 Refresh revlogs if a change to a file has been detected; do not force reload of the whole repository
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parents: 606
diff changeset
422
66f1cc23b906 Refresh revlogs if a change to a file has been detected; do not force reload of the whole repository
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diff changeset
423 /*
66f1cc23b906 Refresh revlogs if a change to a file has been detected; do not force reload of the whole repository
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diff changeset
424 * Note, this method IS NOT a replacement for Observer. It has to be invoked when the validity of any
66f1cc23b906 Refresh revlogs if a change to a file has been detected; do not force reload of the whole repository
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diff changeset
425 * cache built using revision information is in doubt, but it provides reasonable value only till the
66f1cc23b906 Refresh revlogs if a change to a file has been detected; do not force reload of the whole repository
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parents: 606
diff changeset
426 * first initOutline() to be invoked, i.e. in [change..revlog read operation] time frame. If your code
66f1cc23b906 Refresh revlogs if a change to a file has been detected; do not force reload of the whole repository
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parents: 606
diff changeset
427 * accesses cached information without any prior explicit read operation, you shall consult this method
66f1cc23b906 Refresh revlogs if a change to a file has been detected; do not force reload of the whole repository
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parents: 606
diff changeset
428 * if next read operation would in fact bring changed content.
66f1cc23b906 Refresh revlogs if a change to a file has been detected; do not force reload of the whole repository
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parents: 606
diff changeset
429 * Observer is needed in addition to this method because any revlog read operation (e.g. Revlog#getLastRevision)
66f1cc23b906 Refresh revlogs if a change to a file has been detected; do not force reload of the whole repository
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parents: 606
diff changeset
430 * would clear shallDropDerivedCaches(), and if code relies only on this method to clear its derived caches,
66f1cc23b906 Refresh revlogs if a change to a file has been detected; do not force reload of the whole repository
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parents: 606
diff changeset
431 * it would miss the update.
66f1cc23b906 Refresh revlogs if a change to a file has been detected; do not force reload of the whole repository
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parents: 606
diff changeset
432 */
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parents: 606
diff changeset
433 public boolean shallDropDerivedCaches() {
66f1cc23b906 Refresh revlogs if a change to a file has been detected; do not force reload of the whole repository
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parents: 606
diff changeset
434 if (shallDropDerivedCaches) {
66f1cc23b906 Refresh revlogs if a change to a file has been detected; do not force reload of the whole repository
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parents: 606
diff changeset
435 return shallDropDerivedCaches;
66f1cc23b906 Refresh revlogs if a change to a file has been detected; do not force reload of the whole repository
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parents: 606
diff changeset
436 }
66f1cc23b906 Refresh revlogs if a change to a file has been detected; do not force reload of the whole repository
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parents: 606
diff changeset
437 return shallDropDerivedCaches = changeTracker.hasChanged(indexFile);
66f1cc23b906 Refresh revlogs if a change to a file has been detected; do not force reload of the whole repository
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parents: 606
diff changeset
438 }
198
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
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parents: 170
diff changeset
439
539
9edfd5a223b8 Commit: handle empty repository case
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parents: 538
diff changeset
440 void revisionAdded(int revisionIndex, Nodeid revision, int baseRevisionIndex, long revisionOffset) throws HgInvalidControlFileException {
607
66f1cc23b906 Refresh revlogs if a change to a file has been detected; do not force reload of the whole repository
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parents: 606
diff changeset
441 shallDropDerivedCaches = true;
539
9edfd5a223b8 Commit: handle empty repository case
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parents: 538
diff changeset
442 if (!outlineCached()) {
9edfd5a223b8 Commit: handle empty repository case
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diff changeset
443 return;
9edfd5a223b8 Commit: handle empty repository case
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parents: 538
diff changeset
444 }
9edfd5a223b8 Commit: handle empty repository case
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 538
diff changeset
445 if (baseRevisions.length != revisionIndex) {
9edfd5a223b8 Commit: handle empty repository case
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parents: 538
diff changeset
446 throw new HgInvalidControlFileException(String.format("New entry's index shall be %d, not %d", baseRevisions.length, revisionIndex), null, indexFile);
9edfd5a223b8 Commit: handle empty repository case
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diff changeset
447 }
9edfd5a223b8 Commit: handle empty repository case
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parents: 538
diff changeset
448 if (baseRevisionIndex < 0 || baseRevisionIndex > baseRevisions.length) {
9edfd5a223b8 Commit: handle empty repository case
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parents: 538
diff changeset
449 // baseRevisionIndex MAY be == to baseRevisions.length, it's when new revision is based on itself
9edfd5a223b8 Commit: handle empty repository case
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parents: 538
diff changeset
450 throw new HgInvalidControlFileException(String.format("Base revision index %d doesn't fit [0..%d] range", baseRevisionIndex, baseRevisions.length), null, indexFile);
9edfd5a223b8 Commit: handle empty repository case
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parents: 538
diff changeset
451 }
9edfd5a223b8 Commit: handle empty repository case
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parents: 538
diff changeset
452 assert revision != null;
9edfd5a223b8 Commit: handle empty repository case
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diff changeset
453 assert !revision.isNull();
621
99ad1e3a4e4d RevlogStream: be aware of existence (not HgDataFile), facilitate use of an added HgDataFile over a commit; Rollback: be more sensitive about file changes (file size is not enough: write/rollback leaves it intact); tests
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parents: 617
diff changeset
454 // next effort doesn't seem to be of any value at least in case of regular commit
99ad1e3a4e4d RevlogStream: be aware of existence (not HgDataFile), facilitate use of an added HgDataFile over a commit; Rollback: be more sensitive about file changes (file size is not enough: write/rollback leaves it intact); tests
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 617
diff changeset
455 // as the next call to #initOutline would recognize the file change and reload complete revlog anyway
99ad1e3a4e4d RevlogStream: be aware of existence (not HgDataFile), facilitate use of an added HgDataFile over a commit; Rollback: be more sensitive about file changes (file size is not enough: write/rollback leaves it intact); tests
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 617
diff changeset
456 // OTOH, there might be transaction strategy that doesn't update the file until its completion,
99ad1e3a4e4d RevlogStream: be aware of existence (not HgDataFile), facilitate use of an added HgDataFile over a commit; Rollback: be more sensitive about file changes (file size is not enough: write/rollback leaves it intact); tests
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 617
diff changeset
457 // while it's handy to know new revisions meanwhile.
539
9edfd5a223b8 Commit: handle empty repository case
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parents: 538
diff changeset
458 int[] baseRevisionsCopy = new int[baseRevisions.length + 1];
9edfd5a223b8 Commit: handle empty repository case
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parents: 538
diff changeset
459 System.arraycopy(baseRevisions, 0, baseRevisionsCopy, 0, baseRevisions.length);
9edfd5a223b8 Commit: handle empty repository case
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parents: 538
diff changeset
460 baseRevisionsCopy[baseRevisions.length] = baseRevisionIndex;
9edfd5a223b8 Commit: handle empty repository case
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parents: 538
diff changeset
461 baseRevisions = baseRevisionsCopy;
9edfd5a223b8 Commit: handle empty repository case
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parents: 538
diff changeset
462 if (inline && indexRecordOffset != null) {
9edfd5a223b8 Commit: handle empty repository case
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parents: 538
diff changeset
463 assert indexRecordOffset.length == revisionIndex;
9edfd5a223b8 Commit: handle empty repository case
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parents: 538
diff changeset
464 int[] indexRecordOffsetCopy = new int[indexRecordOffset.length + 1];
559
6ca3d0c5b4bc Commit: tests and fixes for defects discovered
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 539
diff changeset
465 System.arraycopy(indexRecordOffset, 0, indexRecordOffsetCopy, 0, indexRecordOffset.length);
539
9edfd5a223b8 Commit: handle empty repository case
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parents: 538
diff changeset
466 indexRecordOffsetCopy[indexRecordOffset.length] = offsetFieldToInlineFileOffset(revisionOffset, revisionIndex);
9edfd5a223b8 Commit: handle empty repository case
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parents: 538
diff changeset
467 indexRecordOffset = indexRecordOffsetCopy;
9edfd5a223b8 Commit: handle empty repository case
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parents: 538
diff changeset
468 }
9edfd5a223b8 Commit: handle empty repository case
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 538
diff changeset
469 }
9edfd5a223b8 Commit: handle empty repository case
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parents: 538
diff changeset
470
198
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
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parents: 170
diff changeset
471 private int getBaseRevision(int revision) {
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
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parents: 170
diff changeset
472 return baseRevisions[revision];
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
473 }
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
474
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
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parents: 170
diff changeset
475 /**
354
5f9073eabf06 Propagate errors with exceptions up to a end client
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 347
diff changeset
476 * @param revisionIndex shall be valid index, [0..baseRevisions.length-1].
5f9073eabf06 Propagate errors with exceptions up to a end client
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 347
diff changeset
477 * It's advised to use {@link #checkRevisionIndex(int)} to ensure argument is correct.
198
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
478 * @return offset of the revision's record in the index (.i) stream
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
479 */
354
5f9073eabf06 Propagate errors with exceptions up to a end client
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 347
diff changeset
480 private int getIndexOffsetInt(int revisionIndex) {
5f9073eabf06 Propagate errors with exceptions up to a end client
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 347
diff changeset
481 return inline ? indexRecordOffset[revisionIndex] : revisionIndex * REVLOGV1_RECORD_SIZE;
5f9073eabf06 Propagate errors with exceptions up to a end client
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 347
diff changeset
482 }
5f9073eabf06 Propagate errors with exceptions up to a end client
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 347
diff changeset
483
628
6526d8adbc0f Explicit HgRuntimeException to facilitate easy switch from runtime to checked exceptions
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 621
diff changeset
484 private int checkRevisionIndex(int revisionIndex) throws HgInvalidControlFileException, HgInvalidRevisionException {
354
5f9073eabf06 Propagate errors with exceptions up to a end client
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 347
diff changeset
485 final int last = revisionCount() - 1;
5f9073eabf06 Propagate errors with exceptions up to a end client
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 347
diff changeset
486 if (revisionIndex == TIP) {
5f9073eabf06 Propagate errors with exceptions up to a end client
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 347
diff changeset
487 revisionIndex = last;
5f9073eabf06 Propagate errors with exceptions up to a end client
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 347
diff changeset
488 }
5f9073eabf06 Propagate errors with exceptions up to a end client
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 347
diff changeset
489 if (revisionIndex < 0 || revisionIndex > last) {
5f9073eabf06 Propagate errors with exceptions up to a end client
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 347
diff changeset
490 throw new HgInvalidRevisionException(revisionIndex).setRevisionIndex(revisionIndex, 0, last);
5f9073eabf06 Propagate errors with exceptions up to a end client
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 347
diff changeset
491 }
5f9073eabf06 Propagate errors with exceptions up to a end client
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 347
diff changeset
492 return revisionIndex;
198
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
493 }
539
9edfd5a223b8 Commit: handle empty repository case
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 538
diff changeset
494
9edfd5a223b8 Commit: handle empty repository case
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 538
diff changeset
495 private boolean outlineCached() {
9edfd5a223b8 Commit: handle empty repository case
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 538
diff changeset
496 return baseRevisions != null && baseRevisions.length > 0;
9edfd5a223b8 Commit: handle empty repository case
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 538
diff changeset
497 }
9edfd5a223b8 Commit: handle empty repository case
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 538
diff changeset
498
584
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
499 // translate 6-byte offset field value to physical file offset for inline revlogs
539
9edfd5a223b8 Commit: handle empty repository case
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 538
diff changeset
500 // DOESN'T MAKE SENSE if revlog with data is separate
9edfd5a223b8 Commit: handle empty repository case
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 538
diff changeset
501 private static int offsetFieldToInlineFileOffset(long offset, int recordIndex) throws HgInvalidStateException {
9edfd5a223b8 Commit: handle empty repository case
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 538
diff changeset
502 int o = Internals.ltoi(offset);
9edfd5a223b8 Commit: handle empty repository case
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 538
diff changeset
503 if (o != offset) {
9edfd5a223b8 Commit: handle empty repository case
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 538
diff changeset
504 // just in case, can't happen, ever, unless HG (or some other bad tool) produces index file
9edfd5a223b8 Commit: handle empty repository case
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 538
diff changeset
505 // with inlined data of size greater than 2 Gb.
9edfd5a223b8 Commit: handle empty repository case
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 538
diff changeset
506 throw new HgInvalidStateException("Data too big, offset didn't fit to sizeof(int)");
9edfd5a223b8 Commit: handle empty repository case
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 538
diff changeset
507 }
9edfd5a223b8 Commit: handle empty repository case
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 538
diff changeset
508 return o + REVLOGV1_RECORD_SIZE * recordIndex;
9edfd5a223b8 Commit: handle empty repository case
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 538
diff changeset
509 }
198
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
510
607
66f1cc23b906 Refresh revlogs if a change to a file has been detected; do not force reload of the whole repository
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 606
diff changeset
511 // every access to index revlog goes after this method only.
425
48f993aa2f41 FIXMEs: exceptions, javadoc
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 423
diff changeset
512 private void initOutline() throws HgInvalidControlFileException {
607
66f1cc23b906 Refresh revlogs if a change to a file has been detected; do not force reload of the whole repository
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 606
diff changeset
513 // true to send out 'drop-your-caches' event after outline has been built
66f1cc23b906 Refresh revlogs if a change to a file has been detected; do not force reload of the whole repository
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 606
diff changeset
514 final boolean notifyReload;
539
9edfd5a223b8 Commit: handle empty repository case
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 538
diff changeset
515 if (outlineCached()) {
607
66f1cc23b906 Refresh revlogs if a change to a file has been detected; do not force reload of the whole repository
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 606
diff changeset
516 if (!changeTracker.hasChanged(indexFile)) {
66f1cc23b906 Refresh revlogs if a change to a file has been detected; do not force reload of the whole repository
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 606
diff changeset
517 return;
66f1cc23b906 Refresh revlogs if a change to a file has been detected; do not force reload of the whole repository
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 606
diff changeset
518 }
66f1cc23b906 Refresh revlogs if a change to a file has been detected; do not force reload of the whole repository
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 606
diff changeset
519 notifyReload = true;
66f1cc23b906 Refresh revlogs if a change to a file has been detected; do not force reload of the whole repository
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 606
diff changeset
520 } else {
66f1cc23b906 Refresh revlogs if a change to a file has been detected; do not force reload of the whole repository
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 606
diff changeset
521 // no cached outline - inital read, do not send any reload/invalidate notifications
66f1cc23b906 Refresh revlogs if a change to a file has been detected; do not force reload of the whole repository
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 606
diff changeset
522 notifyReload = false;
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
523 }
607
66f1cc23b906 Refresh revlogs if a change to a file has been detected; do not force reload of the whole repository
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 606
diff changeset
524 changeTracker.touch(indexFile);
606
5daa42067e7c Avoid mmap files when only few bytes are to be read
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 594
diff changeset
525 DataAccess da = getIndexStream(false);
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
526 try {
202
706bcc7cfee4 Basic test for HgIncomingCommand. Fix RepositoryComparator for cases when whole repository is unknown. Respect freshly initialized (empty) repositories in general.
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 198
diff changeset
527 if (da.isEmpty()) {
706bcc7cfee4 Basic test for HgIncomingCommand. Fix RepositoryComparator for cases when whole repository is unknown. Respect freshly initialized (empty) repositories in general.
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 198
diff changeset
528 // 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.
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 198
diff changeset
529 baseRevisions = new int[0];
539
9edfd5a223b8 Commit: handle empty repository case
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 538
diff changeset
530 // empty revlog, likely to be populated, indicate we start with a single file
9edfd5a223b8 Commit: handle empty repository case
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 538
diff changeset
531 inline = true;
202
706bcc7cfee4 Basic test for HgIncomingCommand. Fix RepositoryComparator for cases when whole repository is unknown. Respect freshly initialized (empty) repositories in general.
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 198
diff changeset
532 return;
706bcc7cfee4 Basic test for HgIncomingCommand. Fix RepositoryComparator for cases when whole repository is unknown. Respect freshly initialized (empty) repositories in general.
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 198
diff changeset
533 }
9
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
534 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
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 158
diff changeset
535 da.readInt(); // just to skip next 4 bytes of offset + flags
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
536 inline = (versionField & INLINEDATA) != 0;
288
b11f6a08f748 Avoid boxing int values and list resizes on revlog read
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 280
diff changeset
537 IntVector resBases, resOffsets = null;
420
6c22bdc0bdfd Respect long offsets in revlogs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 398
diff changeset
538 int entryCountGuess = Internals.ltoi(da.longLength() / REVLOGV1_RECORD_SIZE);
288
b11f6a08f748 Avoid boxing int values and list resizes on revlog read
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 280
diff changeset
539 if (inline) {
b11f6a08f748 Avoid boxing int values and list resizes on revlog read
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 280
diff changeset
540 entryCountGuess >>>= 2; // pure guess, assume useful data takes 3/4 of total space
b11f6a08f748 Avoid boxing int values and list resizes on revlog read
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 280
diff changeset
541 resOffsets = new IntVector(entryCountGuess, 5000);
b11f6a08f748 Avoid boxing int values and list resizes on revlog read
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 280
diff changeset
542 }
b11f6a08f748 Avoid boxing int values and list resizes on revlog read
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 280
diff changeset
543 resBases = new IntVector(entryCountGuess, 5000);
b11f6a08f748 Avoid boxing int values and list resizes on revlog read
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 280
diff changeset
544
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
545 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
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
546 while(true) {
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
547 int compressedLen = da.readInt();
5
fc265ddeab26 File content and non-effective, although working, patch application
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 4
diff changeset
548 // 8+4 = 12 bytes total read here
49
26e3eeaa3962 branch and user filtering for log operation
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 44
diff changeset
549 @SuppressWarnings("unused")
9
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
550 int actualLen = da.readInt();
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
551 int baseRevision = da.readInt();
5
fc265ddeab26 File content and non-effective, although working, patch application
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 4
diff changeset
552 // 12 + 8 = 20 bytes read here
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
553 // int linkRevision = di.readInt();
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
554 // int parent1Revision = di.readInt();
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
555 // int parent2Revision = di.readInt();
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
556 // byte[] nodeid = new byte[32];
198
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
557 resBases.add(baseRevision);
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
558 if (inline) {
539
9edfd5a223b8 Commit: handle empty repository case
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 538
diff changeset
559 int o = offsetFieldToInlineFileOffset(offset, resOffsets.size());
9edfd5a223b8 Commit: handle empty repository case
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 538
diff changeset
560 resOffsets.add(o);
9
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
561 da.skip(3*4 + 32 + compressedLen); // Check: 44 (skip) + 20 (read) = 64 (total RevlogNG record size)
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
562 } else {
9
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
563 da.skip(3*4 + 32);
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
564 }
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 9
diff changeset
565 if (da.isEmpty()) {
9
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
566 // fine, done then
288
b11f6a08f748 Avoid boxing int values and list resizes on revlog read
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 280
diff changeset
567 baseRevisions = resBases.toArray(true);
198
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
568 if (inline) {
288
b11f6a08f748 Avoid boxing int values and list resizes on revlog read
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 280
diff changeset
569 indexRecordOffset = resOffsets.toArray(true);
198
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
570 }
9
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
571 break;
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 9
diff changeset
572 } else {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 9
diff changeset
573 // 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
574 long l = da.readLong();
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 9
diff changeset
575 offset = l >>> 16;
9
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
576 }
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
577 }
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
578 } 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
579 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
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
580 } finally {
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
581 da.done();
607
66f1cc23b906 Refresh revlogs if a change to a file has been detected; do not force reload of the whole repository
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 606
diff changeset
582 if (notifyReload && observers != null) {
66f1cc23b906 Refresh revlogs if a change to a file has been detected; do not force reload of the whole repository
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 606
diff changeset
583 for (Observer l : observers) {
66f1cc23b906 Refresh revlogs if a change to a file has been detected; do not force reload of the whole repository
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 606
diff changeset
584 l.reloaded(this);
66f1cc23b906 Refresh revlogs if a change to a file has been detected; do not force reload of the whole repository
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 606
diff changeset
585 }
66f1cc23b906 Refresh revlogs if a change to a file has been detected; do not force reload of the whole repository
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 606
diff changeset
586 shallDropDerivedCaches = false;
66f1cc23b906 Refresh revlogs if a change to a file has been detected; do not force reload of the whole repository
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 606
diff changeset
587 }
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
588 }
3
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
589 }
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
590
593
9619301a7bb9 Share last revision read between #iterate() invocations, to save revision rebuild efforts when few subsequent revisions are read
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 585
diff changeset
591 private CachedRevision getLastRevisionRead() {
9619301a7bb9 Share last revision read between #iterate() invocations, to save revision rebuild efforts when few subsequent revisions are read
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 585
diff changeset
592 return lastRevisionRead == null ? null : lastRevisionRead.get();
9619301a7bb9 Share last revision read between #iterate() invocations, to save revision rebuild efforts when few subsequent revisions are read
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 585
diff changeset
593 }
9619301a7bb9 Share last revision read between #iterate() invocations, to save revision rebuild efforts when few subsequent revisions are read
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 585
diff changeset
594
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595 private void setLastRevisionRead(CachedRevision cr) {
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596 // done() for lastRevisionRead.userData has been called by ReaderN1 once
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597 // it noticed unsuitable DataAccess.
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598 // Now, done() for any CachedRevision cleared by GC:
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599 for (Reference<? extends CachedRevision> r; (r = lastRevisionQueue.poll()) != null;) {
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600 CachedRevision toClean = r.get();
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601 if (toClean != null && toClean.userData != null) {
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602 toClean.userData.done();
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603 }
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604 }
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605 if (cr != null) {
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diff changeset
606 lastRevisionRead = new SoftReference<CachedRevision>(cr, lastRevisionQueue);
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607 } else {
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diff changeset
608 lastRevisionRead = null;
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609 }
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610 }
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611
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612 final static class CachedRevision {
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613 final int revision;
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614 final DataAccess userData;
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615
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616 public CachedRevision(int lastRevisionRead, DataAccess lastUserData) {
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617 revision = lastRevisionRead;
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618 userData = lastUserData;
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parents: 585
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619 }
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620 }
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621
242
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622 /**
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623 * operation with single file open/close and multiple diverse reads.
366
189dc6dc1c3e Use exceptions to expose errors reading mercurial data
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624 * XXX initOutline might need similar extraction to keep N1 format knowledge
242
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625 */
584
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626 final class ReaderN1 {
242
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627 private final Inspector inspector;
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628 private final boolean needData;
584
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629 private final boolean mergePatches;
242
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630 private DataAccess daIndex = null, daData = null;
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631 private Lifecycle.BasicCallback cb = null;
520
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632 private Lifecycle lifecycleListener = null;
242
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633 private int lastRevisionRead = BAD_REVISION;
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634 private DataAccess lastUserData;
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635 //
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636 // next are transient values, for range() use only
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637 private final Inflater inflater = new Inflater();
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638 // 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
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 607
diff changeset
639 private final byte[] inflaterBuffer = new byte[10 * 1024]; // TODO [post-1.1] consider using DAP.DEFAULT_FILE_BUFFER
655
bcbcc318f250 Performance: reuse unzip output buffer
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parents: 644
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640 private final ByteBuffer inflaterOutBuffer = ByteBuffer.allocate(inflaterBuffer.length * 2);
584
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641 private final byte[] nodeidBuf = new byte[20];
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diff changeset
642 // revlog record fields
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643 private long offset;
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diff changeset
644 @SuppressWarnings("unused")
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645 private int flags;
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646 private int compressedLen;
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647 private int actualLen;
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648 private int baseRevision;
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649 private int linkRevision;
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650 private int parent1Revision;
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651 private int parent2Revision;
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652
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653 public ReaderN1(boolean dataRequested, Inspector insp, boolean usePatchMerge) {
242
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654 assert insp != null;
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655 needData = dataRequested;
242
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656 inspector = insp;
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657 mergePatches = usePatchMerge;
242
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658 }
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659
593
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660 public void start(int totalWork, CachedRevision cachedRevision) {
606
5daa42067e7c Avoid mmap files when only few bytes are to be read
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parents: 594
diff changeset
661 daIndex = getIndexStream(totalWork <= 10);
242
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662 if (needData && !inline) {
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663 daData = getDataStream();
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664 }
520
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diff changeset
665 lifecycleListener = Adaptable.Factory.getAdapter(inspector, Lifecycle.class, null);
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666 if (lifecycleListener != null) {
242
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667 cb = new Lifecycle.BasicCallback();
520
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diff changeset
668 lifecycleListener.start(totalWork, cb, cb);
242
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diff changeset
669 }
593
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670 if (needData && cachedRevision != null) {
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diff changeset
671 lastUserData = cachedRevision.userData;
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672 lastRevisionRead = cachedRevision.revision;
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parents: 585
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673 assert lastUserData != null;
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674 }
242
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675 }
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diff changeset
676
520
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diff changeset
677 // invoked only once per instance
593
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678 public CachedRevision finish() {
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679 CachedRevision rv = null;
242
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diff changeset
680 if (lastUserData != null) {
594
cc7b0c4dc993 Cache only in-memory revision representations
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parents: 593
diff changeset
681 if (lastUserData instanceof ByteArrayDataAccess) {
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parents: 593
diff changeset
682 // it's safe to cache only in-memory revision texts,
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parents: 593
diff changeset
683 // if lastUserData is merely a filter over file stream,
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parents: 593
diff changeset
684 // we'd need to keep file open, and this is bad.
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parents: 593
diff changeset
685 // XXX perhaps, wrap any DataAccess.byteArray into
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parents: 593
diff changeset
686 // ByteArrayDataAccess?
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diff changeset
687 rv = new CachedRevision(lastRevisionRead, lastUserData);
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parents: 593
diff changeset
688 } else {
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diff changeset
689 lastUserData.done();
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diff changeset
690 }
242
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691 lastUserData = null;
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692 }
520
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diff changeset
693 if (lifecycleListener != null) {
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diff changeset
694 lifecycleListener.finish(cb);
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diff changeset
695 lifecycleListener = null;
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diff changeset
696 cb = null;
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diff changeset
697
242
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698 }
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diff changeset
699 daIndex.done();
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diff changeset
700 if (daData != null) {
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diff changeset
701 daData.done();
520
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diff changeset
702 daData = null;
242
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703 }
593
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diff changeset
704 return rv;
242
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diff changeset
705 }
584
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diff changeset
706
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diff changeset
707 private void readHeaderRecord(int i) throws IOException {
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diff changeset
708 if (inline && needData) {
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diff changeset
709 // inspector reading data (though FilterDataAccess) may have affected index position
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diff changeset
710 daIndex.seek(getIndexOffsetInt(i));
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parents: 580
diff changeset
711 }
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diff changeset
712 long l = daIndex.readLong(); // 0
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diff changeset
713 offset = i == 0 ? 0 : (l >>> 16);
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diff changeset
714 flags = (int) (l & 0x0FFFF);
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diff changeset
715 compressedLen = daIndex.readInt(); // +8
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
716 actualLen = daIndex.readInt(); // +12
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
717 baseRevision = daIndex.readInt(); // +16
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
718 linkRevision = daIndex.readInt(); // +20
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
719 parent1Revision = daIndex.readInt();
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
720 parent2Revision = daIndex.readInt();
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
721 // Hg has 32 bytes here, uses 20 for nodeid, and keeps 12 last bytes empty
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
722 daIndex.readBytes(nodeidBuf, 0, 20); // +32
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
723 daIndex.skip(12);
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
724 }
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
725
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
726 private boolean isPatch(int i) {
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
727 return baseRevision != i; // the only way I found to tell if it's a patch
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
728 }
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
729
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
730 private DataAccess getStoredData(int i) throws IOException {
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
731 DataAccess userDataAccess = null;
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
732 DataAccess streamDataAccess;
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
733 long streamOffset;
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
734 if (inline) {
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
735 streamOffset = getIndexOffsetInt(i) + REVLOGV1_RECORD_SIZE;
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
736 streamDataAccess = daIndex;
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
737 // don't need to do seek as it's actual position in the index stream, but it's safe to seek, just in case
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
738 daIndex.longSeek(streamOffset);
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
739 } else {
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
740 streamOffset = offset;
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
741 streamDataAccess = daData;
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
742 daData.longSeek(streamOffset);
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
743 }
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
744 if (streamDataAccess.isEmpty() || compressedLen == 0) {
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
745 userDataAccess = new DataAccess(); // empty
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
746 } else {
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
747 final byte firstByte = streamDataAccess.readByte();
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
748 if (firstByte == 0x78 /* 'x' */) {
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
749 inflater.reset();
655
bcbcc318f250 Performance: reuse unzip output buffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 644
diff changeset
750 userDataAccess = new InflaterDataAccess(streamDataAccess, streamOffset, compressedLen, isPatch(i) ? -1 : actualLen, inflater, inflaterBuffer, inflaterOutBuffer);
584
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
751 } else if (firstByte == 0x75 /* 'u' */) {
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
752 userDataAccess = new FilterDataAccess(streamDataAccess, streamOffset+1, compressedLen-1);
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
753 } else {
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
754 // 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
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
755 //
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
756 // although firstByte is already read from the streamDataAccess, FilterDataAccess#readByte would seek to
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
757 // initial offset before first attempt to read a byte
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
758 userDataAccess = new FilterDataAccess(streamDataAccess, streamOffset, compressedLen);
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
759 }
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
760 }
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
761 return userDataAccess;
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
762 }
263
31f67be94e71 RevlogStream - reduce number of object instances, reuse when possible
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 258
diff changeset
763
520
1ee452f31187 Experimental support for inverse direction history walking. Refactored/streamlined cancellation in HgLogCommand and down the stack
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 440
diff changeset
764 // may be invoked few times per instance life
628
6526d8adbc0f Explicit HgRuntimeException to facilitate easy switch from runtime to checked exceptions
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 621
diff changeset
765 public boolean range(int start, int end) throws IOException, HgRuntimeException {
242
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parents: 223
diff changeset
766 int i;
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
767 // it (i.e. replace with i >= start)
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
768 if (needData && (i = getBaseRevision(start)) < start) {
ad6a046943be Improved reading of sparse revisions from a revlog
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 223
diff changeset
769 // if lastRevisionRead in [baseRevision(start), start) can reuse lastUserData
ad6a046943be Improved reading of sparse revisions from a revlog
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 223
diff changeset
770 // doesn't make sense to reuse if lastRevisionRead == start (too much to change in the cycle below).
ad6a046943be Improved reading of sparse revisions from a revlog
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 223
diff changeset
771 if (lastRevisionRead != BAD_REVISION && i <= lastRevisionRead && lastRevisionRead < start) {
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
772 i = lastRevisionRead + 1; // start with first not-yet-read revision
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parents: 223
diff changeset
773 } else {
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
774 if (lastUserData != null) {
ad6a046943be Improved reading of sparse revisions from a revlog
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 223
diff changeset
775 lastUserData.done();
ad6a046943be Improved reading of sparse revisions from a revlog
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 223
diff changeset
776 lastUserData = null;
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
777 }
ad6a046943be Improved reading of sparse revisions from a revlog
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 223
diff changeset
778 }
ad6a046943be Improved reading of sparse revisions from a revlog
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 223
diff changeset
779 } else {
ad6a046943be Improved reading of sparse revisions from a revlog
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 223
diff changeset
780 // don't need to clean lastUserData as it's always null when !needData
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
781 i = start;
ad6a046943be Improved reading of sparse revisions from a revlog
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 223
diff changeset
782 }
ad6a046943be Improved reading of sparse revisions from a revlog
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 223
diff changeset
783
ad6a046943be Improved reading of sparse revisions from a revlog
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 223
diff changeset
784 daIndex.seek(getIndexOffsetInt(i));
258
e5776067b3b8 Reduce number of objects instantiated on revlog read
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 243
diff changeset
785 //
584
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
786 // reuse instance, do not normalize it as patches from the stream are unlikely to need it
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
787 final Patch patch = new Patch(false);
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
788 //
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
789 if (needData && mergePatches && start-i > 2) {
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
790 // i+1 == start just reads lastUserData, i+2 == start applies one patch - not worth dedicated effort
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
791 Patch ultimatePatch = new Patch(true);
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
792 for ( ; i < start; i++) {
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
793 readHeaderRecord(i);
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
794 DataAccess userDataAccess = getStoredData(i);
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
795 if (lastUserData == null) {
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
796 assert !isPatch(i);
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
797 lastUserData = userDataAccess;
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
798 } else {
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
799 assert isPatch(i); // i < start and i == getBaseRevision()
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
800 patch.read(userDataAccess);
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
801 userDataAccess.done();
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
802 // I assume empty patches are applied ok
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
803 ultimatePatch = ultimatePatch.apply(patch);
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
804 patch.clear();
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
805 }
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
806 }
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
807 lastUserData.reset();
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
808 byte[] userData = ultimatePatch.apply(lastUserData, actualLen);
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
809 ultimatePatch.clear();
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
810 lastUserData.done();
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
811 lastUserData = new ByteArrayDataAccess(userData);
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
812 }
263
31f67be94e71 RevlogStream - reduce number of object instances, reuse when possible
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 258
diff changeset
813 //
242
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parents: 223
diff changeset
814
ad6a046943be Improved reading of sparse revisions from a revlog
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 223
diff changeset
815 for (; i <= end; i++ ) {
584
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
816 readHeaderRecord(i);
242
ad6a046943be Improved reading of sparse revisions from a revlog
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 223
diff changeset
817 DataAccess userDataAccess = null;
ad6a046943be Improved reading of sparse revisions from a revlog
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 223
diff changeset
818 if (needData) {
584
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
819 userDataAccess = getStoredData(i);
397
5e95b0da26f2 Issue 24: IAE, Underflow in FilterDataAccess. Issue 26:UnsupportedOperationException when patching empty base revision. Tests
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 377
diff changeset
820 // userDataAccess is revision content, either complete revision, patch of a previous content, or an empty patch
584
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
821 if (isPatch(i)) {
242
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
822 // this is a patch
397
5e95b0da26f2 Issue 24: IAE, Underflow in FilterDataAccess. Issue 26:UnsupportedOperationException when patching empty base revision. Tests
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 377
diff changeset
823 if (userDataAccess.isEmpty()) {
5e95b0da26f2 Issue 24: IAE, Underflow in FilterDataAccess. Issue 26:UnsupportedOperationException when patching empty base revision. Tests
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 377
diff changeset
824 // Issue 22, empty patch to an empty base revision
5e95b0da26f2 Issue 24: IAE, Underflow in FilterDataAccess. Issue 26:UnsupportedOperationException when patching empty base revision. Tests
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 377
diff changeset
825 // Issue 24, empty patch to non-empty base revision
5e95b0da26f2 Issue 24: IAE, Underflow in FilterDataAccess. Issue 26:UnsupportedOperationException when patching empty base revision. Tests
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 377
diff changeset
826 // empty patch modifies nothing, use content of a previous revision (shall present - it's a patch here)
5e95b0da26f2 Issue 24: IAE, Underflow in FilterDataAccess. Issue 26:UnsupportedOperationException when patching empty base revision. Tests
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 377
diff changeset
827 //
5e95b0da26f2 Issue 24: IAE, Underflow in FilterDataAccess. Issue 26:UnsupportedOperationException when patching empty base revision. Tests
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 377
diff changeset
828 assert lastUserData.length() == actualLen; // with no patch, data size shall be the same
5e95b0da26f2 Issue 24: IAE, Underflow in FilterDataAccess. Issue 26:UnsupportedOperationException when patching empty base revision. Tests
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 377
diff changeset
829 userDataAccess = lastUserData;
5e95b0da26f2 Issue 24: IAE, Underflow in FilterDataAccess. Issue 26:UnsupportedOperationException when patching empty base revision. Tests
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 377
diff changeset
830 } else {
5e95b0da26f2 Issue 24: IAE, Underflow in FilterDataAccess. Issue 26:UnsupportedOperationException when patching empty base revision. Tests
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 377
diff changeset
831 patch.read(userDataAccess);
5e95b0da26f2 Issue 24: IAE, Underflow in FilterDataAccess. Issue 26:UnsupportedOperationException when patching empty base revision. Tests
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 377
diff changeset
832 userDataAccess.done();
5e95b0da26f2 Issue 24: IAE, Underflow in FilterDataAccess. Issue 26:UnsupportedOperationException when patching empty base revision. Tests
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 377
diff changeset
833 //
5e95b0da26f2 Issue 24: IAE, Underflow in FilterDataAccess. Issue 26:UnsupportedOperationException when patching empty base revision. Tests
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 377
diff changeset
834 // it shall be reset at the end of prev iteration, when it got assigned from userDataAccess
5e95b0da26f2 Issue 24: IAE, Underflow in FilterDataAccess. Issue 26:UnsupportedOperationException when patching empty base revision. Tests
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 377
diff changeset
835 // however, actual userDataAccess and lastUserData may share Inflater object, which needs to be reset
5e95b0da26f2 Issue 24: IAE, Underflow in FilterDataAccess. Issue 26:UnsupportedOperationException when patching empty base revision. Tests
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 377
diff changeset
836 // Alternatively, userDataAccess.done() above may be responsible to reset Inflater (if it's InflaterDataAccess)
5e95b0da26f2 Issue 24: IAE, Underflow in FilterDataAccess. Issue 26:UnsupportedOperationException when patching empty base revision. Tests
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 377
diff changeset
837 lastUserData.reset();
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838 // final long startMeasuring = System.currentTimeMillis(); // TIMING
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839 byte[] userData = patch.apply(lastUserData, actualLen);
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840 // applyTime += (System.currentTimeMillis() - startMeasuring); // TIMING
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841 patch.clear(); // do not keep any reference, allow byte[] data to be gc'd
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842 userDataAccess = new ByteArrayDataAccess(userData);
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843 }
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844 }
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845 } else {
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846 if (inline) {
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847 daIndex.skip(compressedLen);
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848 }
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849 }
329
694ebabb5cb3 Refactor revlog patch mechanism, towards patch merging
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850 if (i >= start) {
264
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851 // final long startMeasuring = System.currentTimeMillis(); // TIMING
242
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852 inspector.next(i, actualLen, baseRevision, linkRevision, parent1Revision, parent2Revision, nodeidBuf, userDataAccess);
264
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853 // inspectorTime += (System.currentTimeMillis() - startMeasuring); // TIMING
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854 }
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855 if (cb != null) {
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856 if (cb.isStopped()) {
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857 return false;
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858 }
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859 }
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860 if (userDataAccess != null) {
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861 userDataAccess.reset(); // not sure this is necessary here, as lastUserData would get reset anyway before next use.
242
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862 }
397
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863 if (lastUserData != null && lastUserData != userDataAccess /* empty patch case, reuse of recent data in actual revision */) {
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864 // release lastUserData only if we didn't reuse it in actual revision due to empty patch:
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865 // 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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866 lastUserData.done();
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867 }
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868 lastUserData = userDataAccess;
242
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869 }
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870 lastRevisionRead = end;
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871 return true;
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872 }
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873 }
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874
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875
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c677e1593919 Moved RevlogStream implementation into .internal
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876 public interface Inspector {
608
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877 /**
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878 * XXX boolean retVal to indicate whether to continue?
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879 *
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880 * Implementers shall not invoke DataAccess.done(), it's accomplished by #iterate at appropriate moment
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881 *
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882 * @param revisionIndex absolute index of revision in revlog being iterated
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883 * @param actualLen length of the user data at this revision
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884 * @param baseRevision last revision known to hold complete revision (other hold patches).
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885 * if baseRevision != revisionIndex, data for this revision is a result of a sequence of patches
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886 * @param linkRevision index of corresponding changeset revision
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887 * @param parent1Revision index of first parent revision in this revlog, or {@link HgRepository#NO_REVISION}
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888 * @param parent2Revision index of second parent revision in this revlog, or {@link HgRepository#NO_REVISION}
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889 * @param nodeid 20-byte buffer, shared between invocations
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890 * @param data access to revision content of actualLen size, or <code>null</code> if no data has been requested with
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891 * {@link RevlogStream#iterate(int[], boolean, Inspector)}
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892 */
628
6526d8adbc0f Explicit HgRuntimeException to facilitate easy switch from runtime to checked exceptions
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diff changeset
893 void next(int revisionIndex, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[/*20*/] nodeid, DataAccess data) throws HgRuntimeException;
3
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
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894 }
539
9edfd5a223b8 Commit: handle empty repository case
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895
607
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diff changeset
896 public interface Observer {
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diff changeset
897 // notify observer of invalidate/reload event in the stream
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898 public void reloaded(RevlogStream src);
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diff changeset
899 }
0
dbd663faec1f Basic changelog parsing
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diff changeset
900 }