annotate src/org/tmatesoft/hg/internal/RevlogStream.java @ 643:a8ce405da1f5

v1.2 line of dev: update versions, use patch merge code by default
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 19 Jun 2013 16:03:11 +0200
parents 6526d8adbc0f
children 1deea2f33218
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1 /*
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2 * Copyright (c) 2010-2013 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.internal;
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19 import static org.tmatesoft.hg.repo.HgRepository.BAD_REVISION;
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20 import static org.tmatesoft.hg.repo.HgRepository.TIP;
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21 import static org.tmatesoft.hg.internal.Internals.REVLOGV1_RECORD_SIZE;
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23 import java.io.File;
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24 import java.io.IOException;
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25 import java.lang.ref.Reference;
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26 import java.lang.ref.ReferenceQueue;
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27 import java.lang.ref.SoftReference;
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28 import java.util.ArrayList;
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29 import java.util.List;
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30 import java.util.zip.Inflater;
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32 import org.tmatesoft.hg.core.HgIOException;
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33 import org.tmatesoft.hg.core.Nodeid;
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34 import org.tmatesoft.hg.repo.HgInternals;
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35 import org.tmatesoft.hg.repo.HgInvalidControlFileException;
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36 import org.tmatesoft.hg.repo.HgInvalidRevisionException;
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37 import org.tmatesoft.hg.repo.HgInvalidStateException;
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38 import org.tmatesoft.hg.repo.HgRepository;
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39 import org.tmatesoft.hg.repo.HgRuntimeException;
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40 import org.tmatesoft.hg.util.Adaptable;
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43 /**
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44 * ? Single RevlogStream per file per repository with accessor to record access session (e.g. with back/forward operations),
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45 * or numerous RevlogStream with separate representation of the underlying data (cached, lazy ChunkStream)?
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46 *
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47 * @see http://mercurial.selenic.com/wiki/Revlog
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48 * @see http://mercurial.selenic.com/wiki/RevlogNG
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49 *
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50 * @author Artem Tikhomirov
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51 * @author TMate Software Ltd.
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52 */
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53 public class RevlogStream {
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55 static final int INLINEDATA = 1 << 16;
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57 /*
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58 * makes sense for index with inline data only - actual offset of the record in the .i file (record entry + revision * record size))
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59 *
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60 * long[] in fact (there are 8-bytes field in the revlog)
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61 * However, (a) DataAccess currently doesn't operate with long seek/length
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62 * and, of greater significance, (b) files with inlined data are designated for smaller files,
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63 * guess, about 130 Kb, and offset there won't ever break int capacity
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64 */
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65 private int[] indexRecordOffset;
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66 private int[] baseRevisions;
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67 private boolean inline = false;
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68 private final File indexFile;
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69 private File dataFile;
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70 private final Internals repo;
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71 // keeps last complete revision we've read. Note, this cached revision doesn't help
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72 // for subsequent #iterate() calls with the same revision (Inspector needs more data than
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73 // we currently cache here, perhaps, we shall cache everything it wants to cover same
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74 // revision case as well). Now this helps when second #iterate() call is for a revision greater
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75 // than one from the first call, and both revisions got same base rev. It's often the case when
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76 // parents/children are analyzed.
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77 private SoftReference<CachedRevision> lastRevisionRead;
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78 private final ReferenceQueue<CachedRevision> lastRevisionQueue = new ReferenceQueue<CachedRevision>();
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79 //
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80 private final RevlogChangeMonitor changeTracker;
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81 private List<Observer> observers;
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82 private boolean shallDropDerivedCaches = false;
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83
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84 public RevlogStream(Internals hgRepo, File indexFile) {
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85 repo = hgRepo;
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86 this.indexFile = indexFile;
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87 changeTracker = repo.getRevlogTracker(indexFile);
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88 }
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90 public boolean exists() {
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91 return indexFile.exists();
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92 }
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94 /**
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95 * @param shortRead pass <code>true</code> to indicate intention to read few revisions only (as opposed to reading most of/complete revlog)
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96 * @return never <code>null</code>, empty {@link DataAccess} if no stream is available
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97 */
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98 /*package*/ DataAccess getIndexStream(boolean shortRead) {
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99 // shortRead hint helps to avoid mmap files when only
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100 // few bytes are to be read (i.e. #dataLength())
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101 DataAccessProvider dataAccess = repo.getDataAccess();
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102 return dataAccess.createReader(indexFile, shortRead);
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103 }
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104
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105 /*package*/ DataAccess getDataStream() {
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106 DataAccessProvider dataAccess = repo.getDataAccess();
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107 return dataAccess.createReader(getDataFile(), false);
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108 }
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110 /*package*/ DataSerializer getIndexStreamWriter(Transaction tr) throws HgIOException {
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111 DataAccessProvider dataAccess = repo.getDataAccess();
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112 return dataAccess.createWriter(tr, indexFile, true);
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113 }
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114
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115 /*package*/ DataSerializer getDataStreamWriter(Transaction tr) throws HgIOException {
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116 DataAccessProvider dataAccess = repo.getDataAccess();
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117 return dataAccess.createWriter(tr, getDataFile(), true);
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118 }
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119
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120 /**
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121 * Constructs file object that corresponds to .d revlog counterpart.
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122 * Note, it's caller responsibility to ensure this file makes any sense (i.e. check {@link #inline} attribute)
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123 */
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124 private File getDataFile() {
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125 if (dataFile == null) {
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126 final String indexName = indexFile.getName();
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127 dataFile = new File(indexFile.getParentFile(), indexName.substring(0, indexName.length() - 1) + "d");
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128 }
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129 return dataFile;
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130 }
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131
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132 // initialize exception with the file where revlog structure information comes from
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133 public HgInvalidControlFileException initWithIndexFile(HgInvalidControlFileException ex) {
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134 return ex.setFile(indexFile);
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135 }
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136
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137 // initialize exception with the file where revlog data comes from
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138 public HgInvalidControlFileException initWithDataFile(HgInvalidControlFileException ex) {
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139 // exceptions are usually raised after read attepmt, hence inline shall be initialized
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140 // although honest approach is to call #initOutline() first
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141 return ex.setFile(inline ? indexFile : getDataFile());
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142 }
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143
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144 /*package-private*/String getDataFileName() {
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145 // XXX a temporary solution to provide more info to fill in exceptions other than
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146 // HgInvalidControlFileException (those benefit from initWith* methods above)
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147 //
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148 // Besides, since RevlogStream represents both revlogs with user data (those with WC representative and
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149 // system data under store/data) and system-only revlogs (like changelog and manifest), there's no
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150 // easy way to supply human-friendly name of the active file (independent from whether it's index of data)
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151 return inline ? indexFile.getPath() : getDataFile().getPath();
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152 }
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153
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154 public boolean isInlineData() throws HgInvalidControlFileException {
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155 initOutline();
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156 return inline;
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157 }
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158
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159 public int revisionCount() throws HgInvalidControlFileException {
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160 initOutline();
198
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161 return baseRevisions.length;
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162 }
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163
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164 /**
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165 * @throws HgInvalidControlFileException if attempt to read index file failed
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166 * @throws HgInvalidRevisionException if revisionIndex argument doesn't represent a valid record in the revlog
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167 */
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168 public int dataLength(int revisionIndex) throws HgInvalidControlFileException, HgInvalidRevisionException {
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169 // XXX in fact, use of iterate() instead of this implementation may be quite reasonable.
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170 //
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171 revisionIndex = checkRevisionIndex(revisionIndex);
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172 DataAccess daIndex = getIndexStream(true);
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173 try {
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174 int recordOffset = getIndexOffsetInt(revisionIndex);
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175 daIndex.seek(recordOffset + 12); // 6+2+4
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176 int actualLen = daIndex.readInt();
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177 return actualLen;
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178 } catch (IOException ex) {
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179 throw new HgInvalidControlFileException(null, ex, indexFile).setRevisionIndex(revisionIndex);
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180 } finally {
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181 daIndex.done();
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182 }
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183 }
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184
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185 /**
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186 * Read nodeid at given index
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187 *
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188 * @throws HgInvalidControlFileException if attempt to read index file failed
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189 * @throws HgInvalidRevisionException if revisionIndex argument doesn't represent a valid record in the revlog
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190 */
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191 public byte[] nodeid(int revisionIndex) throws HgInvalidControlFileException, HgInvalidRevisionException {
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192 revisionIndex = checkRevisionIndex(revisionIndex);
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193 DataAccess daIndex = getIndexStream(true);
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194 try {
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195 int recordOffset = getIndexOffsetInt(revisionIndex);
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196 daIndex.seek(recordOffset + 32);
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197 byte[] rv = new byte[20];
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198 daIndex.readBytes(rv, 0, 20);
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199 return rv;
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200 } catch (IOException ex) {
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201 throw new HgInvalidControlFileException("Revision lookup failed", ex, indexFile).setRevisionIndex(revisionIndex);
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202 } finally {
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203 daIndex.done();
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204 }
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205 }
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206
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207 /**
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208 * Get link field from the index record.
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209 *
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210 * @throws HgInvalidControlFileException if attempt to read index file failed
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211 * @throws HgInvalidRevisionException if revisionIndex argument doesn't represent a valid record in the revlog
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212 */
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213 public int linkRevision(int revisionIndex) throws HgInvalidControlFileException, HgInvalidRevisionException {
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214 revisionIndex = checkRevisionIndex(revisionIndex);
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215 DataAccess daIndex = getIndexStream(true);
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216 try {
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217 int recordOffset = getIndexOffsetInt(revisionIndex);
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218 daIndex.seek(recordOffset + 20);
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219 int linkRev = daIndex.readInt();
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220 return linkRev;
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221 } catch (IOException ex) {
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222 throw new HgInvalidControlFileException("Linked revision lookup failed", ex, indexFile).setRevisionIndex(revisionIndex);
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223 } finally {
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224 daIndex.done();
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225 }
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226 }
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227
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228 /**
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229 * Extract base revision field from the revlog
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230 *
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231 * @throws HgInvalidControlFileException if attempt to read index file failed
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232 * @throws HgInvalidRevisionException if revisionIndex argument doesn't represent a valid record in the revlog
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233 */
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234 public int baseRevision(int revisionIndex) throws HgInvalidControlFileException, HgInvalidRevisionException {
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235 revisionIndex = checkRevisionIndex(revisionIndex);
b47ef0d2777b Access to base revision filed comes handy for debug sometimes
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236 return getBaseRevision(revisionIndex);
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237 }
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238
49
26e3eeaa3962 branch and user filtering for log operation
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239 // Perhaps, RevlogStream should be limited to use of plain int revisions for access,
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240 // while Nodeids should be kept on the level up, in Revlog. Guess, Revlog better keep
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241 // map of nodeids, and once this comes true, we may get rid of this method.
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242 // Unlike its counterpart, {@link Revlog#getLocalRevisionNumber()}, doesn't fail with exception if node not found,
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diff changeset
243 /**
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244 * @return integer in [0..revisionCount()) or {@link HgRepository#BAD_REVISION} if not found
354
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245 * @throws HgInvalidControlFileException if attempt to read index file failed
80
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246 */
367
2fadf8695f8a Use 'revision index' instead of the vague 'local revision number' concept in the API
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diff changeset
247 public int findRevisionIndex(Nodeid nodeid) throws HgInvalidControlFileException {
22
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248 // XXX this one may be implemented with iterate() once there's mechanism to stop iterations
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249 final int indexSize = revisionCount();
606
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250 DataAccess daIndex = getIndexStream(false);
22
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diff changeset
251 try {
24
d4fdd1845b3f Nodeid with array of exactly 20 bytes
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diff changeset
252 byte[] nodeidBuf = new byte[20];
22
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253 for (int i = 0; i < indexSize; i++) {
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diff changeset
254 daIndex.skip(8);
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diff changeset
255 int compressedLen = daIndex.readInt();
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256 daIndex.skip(20);
24
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diff changeset
257 daIndex.readBytes(nodeidBuf, 0, 20);
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258 if (nodeid.equalsTo(nodeidBuf)) {
22
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259 return i;
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260 }
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261 daIndex.skip(inline ? 12 + compressedLen : 12);
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262 }
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diff changeset
263 } catch (IOException ex) {
440
299870249a28 Issue 30: bogus IOException for mmap file on linux
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264 throw new HgInvalidControlFileException("Revision lookup failed", ex, indexFile).setRevision(nodeid);
22
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265 } finally {
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266 daIndex.done();
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267 }
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268 return BAD_REVISION;
22
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269 }
538
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270
539
9edfd5a223b8 Commit: handle empty repository case
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diff changeset
271 /**
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diff changeset
272 * @return value suitable for the corresponding field in the new revision's header, not physical offset in the file
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diff changeset
273 * (which is different in case of inline revlogs)
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diff changeset
274 */
628
6526d8adbc0f Explicit HgRuntimeException to facilitate easy switch from runtime to checked exceptions
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275 public long newEntryOffset() throws HgInvalidControlFileException {
538
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diff changeset
276 if (revisionCount() == 0) {
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diff changeset
277 return 0;
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diff changeset
278 }
606
5daa42067e7c Avoid mmap files when only few bytes are to be read
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diff changeset
279 DataAccess daIndex = getIndexStream(true);
538
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diff changeset
280 int lastRev = revisionCount() - 1;
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diff changeset
281 try {
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diff changeset
282 int recordOffset = getIndexOffsetInt(lastRev);
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diff changeset
283 daIndex.seek(recordOffset);
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diff changeset
284 long value = daIndex.readLong();
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diff changeset
285 value = value >>> 16;
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diff changeset
286 int compressedLen = daIndex.readInt();
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diff changeset
287 return lastRev == 0 ? compressedLen : value + compressedLen;
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diff changeset
288 } catch (IOException ex) {
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diff changeset
289 throw new HgInvalidControlFileException("Linked revision lookup failed", ex, indexFile).setRevisionIndex(lastRev);
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290 } finally {
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diff changeset
291 daIndex.done();
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diff changeset
292 }
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293 }
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diff changeset
294
628
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diff changeset
295 /**
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diff changeset
296 * 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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297 * ? boolean needsNodeid
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298 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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diff changeset
299 */
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diff changeset
300 public void iterate(int start, int end, boolean needData, Inspector inspector) throws HgRuntimeException {
2
08db726a0fb7 Shaping out low-level Hg structures
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diff changeset
301 initOutline();
198
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
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diff changeset
302 final int indexSize = revisionCount();
3
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
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diff changeset
303 if (indexSize == 0) {
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diff changeset
304 return;
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diff changeset
305 }
5
fc265ddeab26 File content and non-effective, although working, patch application
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diff changeset
306 if (end == TIP) {
3
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diff changeset
307 end = indexSize - 1;
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
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diff changeset
308 }
5
fc265ddeab26 File content and non-effective, although working, patch application
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diff changeset
309 if (start == TIP) {
fc265ddeab26 File content and non-effective, although working, patch application
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diff changeset
310 start = indexSize - 1;
fc265ddeab26 File content and non-effective, although working, patch application
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parents: 4
diff changeset
311 }
300
650b45d290b1 Share range check code
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parents: 297
diff changeset
312 HgInternals.checkRevlogRange(start, end, indexSize-1);
2
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diff changeset
313 // XXX may cache [start .. end] from index with a single read (pre-read)
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parents: 0
diff changeset
314
608
e1b29756f901 Clean, organize and resolve some TODOs and FIXMEs: minor refactorings and comments
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parents: 607
diff changeset
315 ReaderN1 r = new ReaderN1(needData, inspector, repo.shallMergePatches());
2
08db726a0fb7 Shaping out low-level Hg structures
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diff changeset
316 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
317 r.start(end - start + 1, getLastRevisionRead());
242
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diff changeset
318 r.range(start, end);
ad6a046943be Improved reading of sparse revisions from a revlog
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diff changeset
319 } catch (IOException ex) {
366
189dc6dc1c3e Use exceptions to expose errors reading mercurial data
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parents: 354
diff changeset
320 throw new HgInvalidControlFileException(String.format("Failed reading [%d..%d]", start, end), ex, indexFile);
242
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
321 } 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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parents: 585
diff changeset
322 CachedRevision cr = r.finish();
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
323 setLastRevisionRead(cr);
242
ad6a046943be Improved reading of sparse revisions from a revlog
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diff changeset
324 }
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diff changeset
325 }
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diff changeset
326
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diff changeset
327 /**
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diff changeset
328 * Effective alternative to {@link #iterate(int, int, boolean, Inspector) batch read}, when only few selected
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diff changeset
329 * revisions are of interest.
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diff changeset
330 * @param sortedRevisions revisions to walk, in ascending order.
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diff changeset
331 * @param needData whether inspector needs access to header only
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diff changeset
332 * @param inspector callback to process entries
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6526d8adbc0f Explicit HgRuntimeException to facilitate easy switch from runtime to checked exceptions
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diff changeset
333 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
242
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diff changeset
334 */
628
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diff changeset
335 public void iterate(int[] sortedRevisions, boolean needData, Inspector inspector) throws HgRuntimeException {
242
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diff changeset
336 final int indexSize = revisionCount();
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diff changeset
337 if (indexSize == 0 || sortedRevisions.length == 0) {
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diff changeset
338 return;
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diff changeset
339 }
347
8da7ade36c57 Add specific IAE subclass to handle wrong (e.g. outdated after rollback) revisions
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diff changeset
340 if (sortedRevisions[0] > indexSize) {
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diff changeset
341 throw new HgInvalidRevisionException(String.format("Can't iterate [%d, %d] in range [0..%d]", sortedRevisions[0], sortedRevisions[sortedRevisions.length - 1], indexSize), null, sortedRevisions[0]);
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diff changeset
342 }
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diff changeset
343 if (sortedRevisions[sortedRevisions.length - 1] > indexSize) {
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diff changeset
344 throw new HgInvalidRevisionException(String.format("Can't iterate [%d, %d] in range [0..%d]", sortedRevisions[0], sortedRevisions[sortedRevisions.length - 1], indexSize), null, sortedRevisions[sortedRevisions.length - 1]);
242
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diff changeset
345 }
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diff changeset
346
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e1b29756f901 Clean, organize and resolve some TODOs and FIXMEs: minor refactorings and comments
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parents: 607
diff changeset
347 ReaderN1 r = new ReaderN1(needData, inspector, repo.shallMergePatches());
242
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diff changeset
348 try {
594
cc7b0c4dc993 Cache only in-memory revision representations
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diff changeset
349 r.start(sortedRevisions.length, getLastRevisionRead());
242
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diff changeset
350 for (int i = 0; i < sortedRevisions.length; ) {
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diff changeset
351 int x = i;
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diff changeset
352 i++;
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diff changeset
353 while (i < sortedRevisions.length) {
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diff changeset
354 if (sortedRevisions[i] == sortedRevisions[i-1] + 1) {
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diff changeset
355 i++;
2
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parents: 0
diff changeset
356 } 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
357 break;
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diff changeset
358 }
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
359 }
242
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360 // commitRevisions[x..i-1] are sequential
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361 if (!r.range(sortedRevisions[x], sortedRevisions[i-1])) {
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362 return;
51
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
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363 }
2
08db726a0fb7 Shaping out low-level Hg structures
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364 }
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365 } catch (IOException ex) {
366
189dc6dc1c3e Use exceptions to expose errors reading mercurial data
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366 final int c = sortedRevisions.length;
608
e1b29756f901 Clean, organize and resolve some TODOs and FIXMEs: minor refactorings and comments
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367 throw new HgInvalidControlFileException(String.format("Failed reading %d revisions in [%d; %d]", c, sortedRevisions[0], sortedRevisions[c-1]), ex, indexFile);
3
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
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diff changeset
368 } 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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369 CachedRevision cr = r.finish();
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370 setLastRevisionRead(cr);
2
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371 }
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372 }
607
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373
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374 public void attach(Observer listener) {
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375 assert listener != null;
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376 if (observers == null) {
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377 observers = new ArrayList<Observer>(3);
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378 }
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diff changeset
379 observers.add(listener);
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380 }
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381
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382 public void detach(Observer listener) {
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383 assert listener != null;
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384 if (observers != null) {
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diff changeset
385 observers.remove(listener);
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386 }
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diff changeset
387 }
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diff changeset
388
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diff changeset
389 /*
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390 * Note, this method IS NOT a replacement for Observer. It has to be invoked when the validity of any
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391 * cache built using revision information is in doubt, but it provides reasonable value only till the
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392 * first initOutline() to be invoked, i.e. in [change..revlog read operation] time frame. If your code
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diff changeset
393 * accesses cached information without any prior explicit read operation, you shall consult this method
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394 * if next read operation would in fact bring changed content.
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diff changeset
395 * Observer is needed in addition to this method because any revlog read operation (e.g. Revlog#getLastRevision)
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396 * would clear shallDropDerivedCaches(), and if code relies only on this method to clear its derived caches,
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diff changeset
397 * it would miss the update.
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diff changeset
398 */
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diff changeset
399 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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diff changeset
400 if (shallDropDerivedCaches) {
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diff changeset
401 return shallDropDerivedCaches;
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diff changeset
402 }
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diff changeset
403 return shallDropDerivedCaches = changeTracker.hasChanged(indexFile);
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diff changeset
404 }
198
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405
539
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diff changeset
406 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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diff changeset
407 shallDropDerivedCaches = true;
539
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408 if (!outlineCached()) {
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409 return;
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diff changeset
410 }
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diff changeset
411 if (baseRevisions.length != revisionIndex) {
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diff changeset
412 throw new HgInvalidControlFileException(String.format("New entry's index shall be %d, not %d", baseRevisions.length, revisionIndex), null, indexFile);
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413 }
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414 if (baseRevisionIndex < 0 || baseRevisionIndex > baseRevisions.length) {
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diff changeset
415 // baseRevisionIndex MAY be == to baseRevisions.length, it's when new revision is based on itself
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diff changeset
416 throw new HgInvalidControlFileException(String.format("Base revision index %d doesn't fit [0..%d] range", baseRevisionIndex, baseRevisions.length), null, indexFile);
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417 }
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418 assert revision != null;
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419 assert !revision.isNull();
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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420 // next effort doesn't seem to be of any value at least in case of regular commit
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421 // as the next call to #initOutline would recognize the file change and reload complete revlog anyway
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diff changeset
422 // OTOH, there might be transaction strategy that doesn't update the file until its completion,
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diff changeset
423 // while it's handy to know new revisions meanwhile.
539
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424 int[] baseRevisionsCopy = new int[baseRevisions.length + 1];
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425 System.arraycopy(baseRevisions, 0, baseRevisionsCopy, 0, baseRevisions.length);
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426 baseRevisionsCopy[baseRevisions.length] = baseRevisionIndex;
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diff changeset
427 baseRevisions = baseRevisionsCopy;
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428 if (inline && indexRecordOffset != null) {
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429 assert indexRecordOffset.length == revisionIndex;
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diff changeset
430 int[] indexRecordOffsetCopy = new int[indexRecordOffset.length + 1];
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6ca3d0c5b4bc Commit: tests and fixes for defects discovered
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diff changeset
431 System.arraycopy(indexRecordOffset, 0, indexRecordOffsetCopy, 0, indexRecordOffset.length);
539
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432 indexRecordOffsetCopy[indexRecordOffset.length] = offsetFieldToInlineFileOffset(revisionOffset, revisionIndex);
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433 indexRecordOffset = indexRecordOffsetCopy;
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434 }
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435 }
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436
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diff changeset
437 private int getBaseRevision(int revision) {
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
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diff changeset
438 return baseRevisions[revision];
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diff changeset
439 }
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diff changeset
440
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diff changeset
441 /**
354
5f9073eabf06 Propagate errors with exceptions up to a end client
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442 * @param revisionIndex shall be valid index, [0..baseRevisions.length-1].
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diff changeset
443 * It's advised to use {@link #checkRevisionIndex(int)} to ensure argument is correct.
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444 * @return offset of the revision's record in the index (.i) stream
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445 */
354
5f9073eabf06 Propagate errors with exceptions up to a end client
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diff changeset
446 private int getIndexOffsetInt(int revisionIndex) {
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diff changeset
447 return inline ? indexRecordOffset[revisionIndex] : revisionIndex * REVLOGV1_RECORD_SIZE;
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diff changeset
448 }
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diff changeset
449
628
6526d8adbc0f Explicit HgRuntimeException to facilitate easy switch from runtime to checked exceptions
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diff changeset
450 private int checkRevisionIndex(int revisionIndex) throws HgInvalidControlFileException, HgInvalidRevisionException {
354
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451 final int last = revisionCount() - 1;
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diff changeset
452 if (revisionIndex == TIP) {
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diff changeset
453 revisionIndex = last;
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diff changeset
454 }
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diff changeset
455 if (revisionIndex < 0 || revisionIndex > last) {
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diff changeset
456 throw new HgInvalidRevisionException(revisionIndex).setRevisionIndex(revisionIndex, 0, last);
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parents: 347
diff changeset
457 }
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diff changeset
458 return revisionIndex;
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diff changeset
459 }
539
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diff changeset
460
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diff changeset
461 private boolean outlineCached() {
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462 return baseRevisions != null && baseRevisions.length > 0;
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diff changeset
463 }
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diff changeset
464
584
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
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parents: 580
diff changeset
465 // translate 6-byte offset field value to physical file offset for inline revlogs
539
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diff changeset
466 // DOESN'T MAKE SENSE if revlog with data is separate
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diff changeset
467 private static int offsetFieldToInlineFileOffset(long offset, int recordIndex) throws HgInvalidStateException {
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diff changeset
468 int o = Internals.ltoi(offset);
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diff changeset
469 if (o != offset) {
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diff changeset
470 // just in case, can't happen, ever, unless HG (or some other bad tool) produces index file
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diff changeset
471 // with inlined data of size greater than 2 Gb.
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diff changeset
472 throw new HgInvalidStateException("Data too big, offset didn't fit to sizeof(int)");
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diff changeset
473 }
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diff changeset
474 return o + REVLOGV1_RECORD_SIZE * recordIndex;
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diff changeset
475 }
198
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diff changeset
476
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
477 // 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
478 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
479 // 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
480 final boolean notifyReload;
539
9edfd5a223b8 Commit: handle empty repository case
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 538
diff changeset
481 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
482 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
483 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
484 }
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
485 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
486 } 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
487 // 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
488 notifyReload = false;
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
489 }
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
490 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
491 DataAccess da = getIndexStream(false);
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
492 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
493 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
494 // 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
495 baseRevisions = new int[0];
539
9edfd5a223b8 Commit: handle empty repository case
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 538
diff changeset
496 // 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
497 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
498 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
499 }
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
500 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
501 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
502 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
503 IntVector resBases, resOffsets = null;
420
6c22bdc0bdfd Respect long offsets in revlogs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 398
diff changeset
504 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
505 if (inline) {
b11f6a08f748 Avoid boxing int values and list resizes on revlog read
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 280
diff changeset
506 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
507 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
508 }
b11f6a08f748 Avoid boxing int values and list resizes on revlog read
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 280
diff changeset
509 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
510
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
511 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
512 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
513 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
514 // 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
515 @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
516 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
517 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
518 // 12 + 8 = 20 bytes read here
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
519 // int linkRevision = di.readInt();
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
520 // int parent1Revision = di.readInt();
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
521 // int parent2Revision = di.readInt();
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
522 // 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
523 resBases.add(baseRevision);
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
524 if (inline) {
539
9edfd5a223b8 Commit: handle empty repository case
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 538
diff changeset
525 int o = offsetFieldToInlineFileOffset(offset, resOffsets.size());
9edfd5a223b8 Commit: handle empty repository case
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 538
diff changeset
526 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
527 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
528 } 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
529 da.skip(3*4 + 32);
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
530 }
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 9
diff changeset
531 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
532 // 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
533 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
534 if (inline) {
288
b11f6a08f748 Avoid boxing int values and list resizes on revlog read
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 280
diff changeset
535 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
536 }
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
537 break;
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 9
diff changeset
538 } else {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 9
diff changeset
539 // 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
540 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
541 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
542 }
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
543 }
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
544 } 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
545 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
546 } 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
547 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
548 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
549 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
550 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
551 }
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
552 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
553 }
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
554 }
3
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
555 }
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
556
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
557 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
558 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
559 }
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
560
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
561 private void setLastRevisionRead(CachedRevision cr) {
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
562 // done() for lastRevisionRead.userData has been called by ReaderN1 once
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
563 // it noticed unsuitable DataAccess.
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
564 // Now, done() for any CachedRevision cleared by GC:
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
565 for (Reference<? extends CachedRevision> r; (r = lastRevisionQueue.poll()) != null;) {
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
566 CachedRevision toClean = r.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
567 if (toClean != null && toClean.userData != null) {
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
568 toClean.userData.done();
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
569 }
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
570 }
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
571 if (cr != null) {
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
572 lastRevisionRead = new SoftReference<CachedRevision>(cr, lastRevisionQueue);
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
573 } else {
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
574 lastRevisionRead = null;
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
575 }
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
576 }
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
577
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
578 final static class CachedRevision {
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
579 final int revision;
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
580 final DataAccess userData;
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
581
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
582 public CachedRevision(int lastRevisionRead, DataAccess lastUserData) {
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
583 revision = lastRevisionRead;
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
584 userData = lastUserData;
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
585 }
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
586 }
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
587
242
ad6a046943be Improved reading of sparse revisions from a revlog
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 223
diff changeset
588 /**
ad6a046943be Improved reading of sparse revisions from a revlog
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 223
diff changeset
589 * operation with single file open/close and multiple diverse reads.
366
189dc6dc1c3e Use exceptions to expose errors reading mercurial data
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 354
diff changeset
590 * XXX initOutline might need similar extraction to keep N1 format knowledge
242
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591 */
584
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592 final class ReaderN1 {
242
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593 private final Inspector inspector;
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594 private final boolean needData;
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595 private final boolean mergePatches;
242
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596 private DataAccess daIndex = null, daData = null;
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597 private Lifecycle.BasicCallback cb = null;
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598 private Lifecycle lifecycleListener = null;
242
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599 private int lastRevisionRead = BAD_REVISION;
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600 private DataAccess lastUserData;
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601 //
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602 // next are transient values, for range() use only
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603 private final Inflater inflater = new Inflater();
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604 // can share buffer between instances of InflaterDataAccess as I never read any two of them in parallel
608
e1b29756f901 Clean, organize and resolve some TODOs and FIXMEs: minor refactorings and comments
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605 private final byte[] inflaterBuffer = new byte[10 * 1024]; // TODO [post-1.1] consider using DAP.DEFAULT_FILE_BUFFER
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606 private final byte[] nodeidBuf = new byte[20];
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607 // revlog record fields
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608 private long offset;
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609 @SuppressWarnings("unused")
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610 private int flags;
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611 private int compressedLen;
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612 private int actualLen;
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613 private int baseRevision;
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614 private int linkRevision;
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615 private int parent1Revision;
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616 private int parent2Revision;
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617
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618 public ReaderN1(boolean dataRequested, Inspector insp, boolean usePatchMerge) {
242
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619 assert insp != null;
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620 needData = dataRequested;
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621 inspector = insp;
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622 mergePatches = usePatchMerge;
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623 }
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624
593
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625 public void start(int totalWork, CachedRevision cachedRevision) {
606
5daa42067e7c Avoid mmap files when only few bytes are to be read
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626 daIndex = getIndexStream(totalWork <= 10);
242
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627 if (needData && !inline) {
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628 daData = getDataStream();
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629 }
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630 lifecycleListener = Adaptable.Factory.getAdapter(inspector, Lifecycle.class, null);
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631 if (lifecycleListener != null) {
242
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632 cb = new Lifecycle.BasicCallback();
520
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633 lifecycleListener.start(totalWork, cb, cb);
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634 }
593
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diff changeset
635 if (needData && cachedRevision != null) {
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diff changeset
636 lastUserData = cachedRevision.userData;
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diff changeset
637 lastRevisionRead = cachedRevision.revision;
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parents: 585
diff changeset
638 assert lastUserData != null;
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639 }
242
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640 }
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641
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642 // invoked only once per instance
593
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643 public CachedRevision finish() {
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644 CachedRevision rv = null;
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645 if (lastUserData != null) {
594
cc7b0c4dc993 Cache only in-memory revision representations
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parents: 593
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646 if (lastUserData instanceof ByteArrayDataAccess) {
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parents: 593
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647 // it's safe to cache only in-memory revision texts,
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648 // if lastUserData is merely a filter over file stream,
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parents: 593
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649 // we'd need to keep file open, and this is bad.
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diff changeset
650 // XXX perhaps, wrap any DataAccess.byteArray into
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diff changeset
651 // ByteArrayDataAccess?
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diff changeset
652 rv = new CachedRevision(lastRevisionRead, lastUserData);
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653 } else {
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654 lastUserData.done();
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655 }
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656 lastUserData = null;
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657 }
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658 if (lifecycleListener != null) {
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diff changeset
659 lifecycleListener.finish(cb);
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660 lifecycleListener = null;
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661 cb = null;
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662
242
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663 }
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664 daIndex.done();
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665 if (daData != null) {
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666 daData.done();
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667 daData = null;
242
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668 }
593
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669 return rv;
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670 }
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671
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diff changeset
672 private void readHeaderRecord(int i) throws IOException {
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diff changeset
673 if (inline && needData) {
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diff changeset
674 // inspector reading data (though FilterDataAccess) may have affected index position
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675 daIndex.seek(getIndexOffsetInt(i));
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676 }
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677 long l = daIndex.readLong(); // 0
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678 offset = i == 0 ? 0 : (l >>> 16);
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679 flags = (int) (l & 0x0FFFF);
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680 compressedLen = daIndex.readInt(); // +8
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681 actualLen = daIndex.readInt(); // +12
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682 baseRevision = daIndex.readInt(); // +16
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683 linkRevision = daIndex.readInt(); // +20
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diff changeset
684 parent1Revision = daIndex.readInt();
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diff changeset
685 parent2Revision = daIndex.readInt();
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686 // Hg has 32 bytes here, uses 20 for nodeid, and keeps 12 last bytes empty
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diff changeset
687 daIndex.readBytes(nodeidBuf, 0, 20); // +32
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diff changeset
688 daIndex.skip(12);
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689 }
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690
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691 private boolean isPatch(int i) {
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diff changeset
692 return baseRevision != i; // the only way I found to tell if it's a patch
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693 }
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694
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695 private DataAccess getStoredData(int i) throws IOException {
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696 DataAccess userDataAccess = null;
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697 DataAccess streamDataAccess;
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698 long streamOffset;
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699 if (inline) {
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diff changeset
700 streamOffset = getIndexOffsetInt(i) + REVLOGV1_RECORD_SIZE;
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diff changeset
701 streamDataAccess = daIndex;
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diff changeset
702 // don't need to do seek as it's actual position in the index stream, but it's safe to seek, just in case
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diff changeset
703 daIndex.longSeek(streamOffset);
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diff changeset
704 } else {
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diff changeset
705 streamOffset = offset;
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706 streamDataAccess = daData;
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diff changeset
707 daData.longSeek(streamOffset);
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708 }
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diff changeset
709 if (streamDataAccess.isEmpty() || compressedLen == 0) {
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diff changeset
710 userDataAccess = new DataAccess(); // empty
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diff changeset
711 } else {
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diff changeset
712 final byte firstByte = streamDataAccess.readByte();
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diff changeset
713 if (firstByte == 0x78 /* 'x' */) {
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diff changeset
714 inflater.reset();
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diff changeset
715 userDataAccess = new InflaterDataAccess(streamDataAccess, streamOffset, compressedLen, isPatch(i) ? -1 : actualLen, inflater, inflaterBuffer);
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diff changeset
716 } 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
717 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
718 } else {
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
719 // XXX Python impl in fact throws exception when there's not 'x', 'u' or '0' but I don't see reason not to return data as is
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
720 //
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
721 // 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
722 // 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
723 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
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 return userDataAccess;
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
727 }
263
31f67be94e71 RevlogStream - reduce number of object instances, reuse when possible
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 258
diff changeset
728
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
729 // 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
730 public boolean range(int start, int end) throws IOException, HgRuntimeException {
242
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parents: 223
diff changeset
731 int i;
ad6a046943be Improved reading of sparse revisions from a revlog
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 223
diff changeset
732 // it (i.e. replace with i >= start)
ad6a046943be Improved reading of sparse revisions from a revlog
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 223
diff changeset
733 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
734 // if lastRevisionRead in [baseRevision(start), start) can reuse lastUserData
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
735 // 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
736 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
737 i = lastRevisionRead + 1; // start with first not-yet-read revision
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
738 } else {
ad6a046943be Improved reading of sparse revisions from a revlog
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 223
diff changeset
739 if (lastUserData != null) {
ad6a046943be Improved reading of sparse revisions from a revlog
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 223
diff changeset
740 lastUserData.done();
ad6a046943be Improved reading of sparse revisions from a revlog
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 223
diff changeset
741 lastUserData = null;
ad6a046943be Improved reading of sparse revisions from a revlog
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 223
diff changeset
742 }
ad6a046943be Improved reading of sparse revisions from a revlog
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 223
diff changeset
743 }
ad6a046943be Improved reading of sparse revisions from a revlog
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 223
diff changeset
744 } else {
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
745 // don't need to clean lastUserData as it's always null when !needData
ad6a046943be Improved reading of sparse revisions from a revlog
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 223
diff changeset
746 i = start;
ad6a046943be Improved reading of sparse revisions from a revlog
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 223
diff changeset
747 }
ad6a046943be Improved reading of sparse revisions from a revlog
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 223
diff changeset
748
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
749 daIndex.seek(getIndexOffsetInt(i));
258
e5776067b3b8 Reduce number of objects instantiated on revlog read
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 243
diff changeset
750 //
584
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parents: 580
diff changeset
751 // reuse instance, do not normalize it as patches from the stream are unlikely to need it
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
752 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
753 //
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
754 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
755 // 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
756 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
757 for ( ; i < start; i++) {
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
758 readHeaderRecord(i);
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
759 DataAccess userDataAccess = getStoredData(i);
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
760 if (lastUserData == null) {
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
761 assert !isPatch(i);
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
762 lastUserData = userDataAccess;
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
763 } else {
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
764 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
765 patch.read(userDataAccess);
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
766 userDataAccess.done();
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
767 // 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
768 ultimatePatch = ultimatePatch.apply(patch);
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
769 patch.clear();
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
770 }
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
771 }
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
772 lastUserData.reset();
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
773 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
774 ultimatePatch.clear();
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
775 lastUserData.done();
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
776 lastUserData = new ByteArrayDataAccess(userData);
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
777 }
263
31f67be94e71 RevlogStream - reduce number of object instances, reuse when possible
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 258
diff changeset
778 //
242
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parents: 223
diff changeset
779
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
780 for (; i <= end; i++ ) {
584
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
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parents: 580
diff changeset
781 readHeaderRecord(i);
242
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
782 DataAccess userDataAccess = null;
ad6a046943be Improved reading of sparse revisions from a revlog
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 223
diff changeset
783 if (needData) {
584
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 580
diff changeset
784 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
785 // 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
786 if (isPatch(i)) {
242
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
787 // 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
788 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
789 // 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
790 // 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
791 // 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
792 //
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
793 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
794 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
795 } 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
796 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
797 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
798 //
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
799 // 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
800 // 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
801 // 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
802 lastUserData.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
803 // final long startMeasuring = System.currentTimeMillis(); // TIMING
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
804 byte[] userData = patch.apply(lastUserData, actualLen);
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
805 // applyTime += (System.currentTimeMillis() - startMeasuring); // TIMING
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
806 patch.clear(); // do not keep any reference, allow byte[] data to be gc'd
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
807 userDataAccess = new ByteArrayDataAccess(userData);
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
808 }
242
ad6a046943be Improved reading of sparse revisions from a revlog
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diff changeset
809 }
ad6a046943be Improved reading of sparse revisions from a revlog
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 223
diff changeset
810 } else {
ad6a046943be Improved reading of sparse revisions from a revlog
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 223
diff changeset
811 if (inline) {
ad6a046943be Improved reading of sparse revisions from a revlog
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 223
diff changeset
812 daIndex.skip(compressedLen);
ad6a046943be Improved reading of sparse revisions from a revlog
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 223
diff changeset
813 }
ad6a046943be Improved reading of sparse revisions from a revlog
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 223
diff changeset
814 }
329
694ebabb5cb3 Refactor revlog patch mechanism, towards patch merging
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 300
diff changeset
815 if (i >= start) {
264
6bb5e7ed051a Optimize memory usage (reduce number of objects instantiated) when pooling file names and nodeids during manifest parsing
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 263
diff changeset
816 // final long startMeasuring = System.currentTimeMillis(); // TIMING
242
ad6a046943be Improved reading of sparse revisions from a revlog
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 223
diff changeset
817 inspector.next(i, actualLen, baseRevision, linkRevision, parent1Revision, parent2Revision, nodeidBuf, userDataAccess);
264
6bb5e7ed051a Optimize memory usage (reduce number of objects instantiated) when pooling file names and nodeids during manifest parsing
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parents: 263
diff changeset
818 // inspectorTime += (System.currentTimeMillis() - startMeasuring); // TIMING
242
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
819 }
ad6a046943be Improved reading of sparse revisions from a revlog
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 223
diff changeset
820 if (cb != null) {
ad6a046943be Improved reading of sparse revisions from a revlog
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 223
diff changeset
821 if (cb.isStopped()) {
ad6a046943be Improved reading of sparse revisions from a revlog
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 223
diff changeset
822 return false;
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
823 }
ad6a046943be Improved reading of sparse revisions from a revlog
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 223
diff changeset
824 }
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
825 if (userDataAccess != null) {
263
31f67be94e71 RevlogStream - reduce number of object instances, reuse when possible
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 258
diff changeset
826 userDataAccess.reset(); // not sure this is necessary here, as lastUserData would get reset anyway before next use.
242
ad6a046943be Improved reading of sparse revisions from a revlog
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diff changeset
827 }
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
828 if (lastUserData != null && lastUserData != userDataAccess /* empty patch case, reuse of recent data in actual 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
829 // release lastUserData only if we didn't reuse it in actual revision due to empty patch:
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 // empty patch means we have previous revision and didn't alter it with a patch, hence use lastUserData for userDataAccess above
263
31f67be94e71 RevlogStream - reduce number of object instances, reuse when possible
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 258
diff changeset
831 lastUserData.done();
31f67be94e71 RevlogStream - reduce number of object instances, reuse when possible
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parents: 258
diff changeset
832 }
31f67be94e71 RevlogStream - reduce number of object instances, reuse when possible
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parents: 258
diff changeset
833 lastUserData = userDataAccess;
242
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834 }
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835 lastRevisionRead = end;
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836 return true;
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837 }
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838 }
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839
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840
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c677e1593919 Moved RevlogStream implementation into .internal
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841 public interface Inspector {
608
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842 /**
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843 * XXX boolean retVal to indicate whether to continue?
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844 *
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845 * Implementers shall not invoke DataAccess.done(), it's accomplished by #iterate at appropriate moment
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846 *
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847 * @param revisionIndex absolute index of revision in revlog being iterated
e1b29756f901 Clean, organize and resolve some TODOs and FIXMEs: minor refactorings and comments
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848 * @param actualLen length of the user data at this revision
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849 * @param baseRevision last revision known to hold complete revision (other hold patches).
e1b29756f901 Clean, organize and resolve some TODOs and FIXMEs: minor refactorings and comments
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850 * if baseRevision != revisionIndex, data for this revision is a result of a sequence of patches
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851 * @param linkRevision index of corresponding changeset revision
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852 * @param parent1Revision index of first parent revision in this revlog, or {@link HgRepository#NO_REVISION}
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853 * @param parent2Revision index of second parent revision in this revlog, or {@link HgRepository#NO_REVISION}
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854 * @param nodeid 20-byte buffer, shared between invocations
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855 * @param data access to revision content of actualLen size, or <code>null</code> if no data has been requested with
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856 * {@link RevlogStream#iterate(int[], boolean, Inspector)}
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857 */
628
6526d8adbc0f Explicit HgRuntimeException to facilitate easy switch from runtime to checked exceptions
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858 void next(int revisionIndex, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[/*20*/] nodeid, DataAccess data) throws HgRuntimeException;
3
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
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859 }
539
9edfd5a223b8 Commit: handle empty repository case
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860
607
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861 public interface Observer {
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862 // notify observer of invalidate/reload event in the stream
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863 public void reloaded(RevlogStream src);
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864 }
0
dbd663faec1f Basic changelog parsing
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865 }