annotate src/org/tmatesoft/hg/internal/RevlogStream.java @ 589:c18095eedde0

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author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Mon, 29 Apr 2013 17:02:30 +0200
parents b47ef0d2777b
children 9619301a7bb9
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1 /*
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2 * Copyright (c) 2010-2013 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.internal;
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18
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19 import static org.tmatesoft.hg.repo.HgRepository.BAD_REVISION;
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20 import static org.tmatesoft.hg.repo.HgRepository.TIP;
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21 import static org.tmatesoft.hg.internal.Internals.REVLOGV1_RECORD_SIZE;
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23 import java.io.File;
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24 import java.io.IOException;
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25 import java.util.zip.Inflater;
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27 import org.tmatesoft.hg.core.Nodeid;
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28 import org.tmatesoft.hg.repo.HgInternals;
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29 import org.tmatesoft.hg.repo.HgInvalidControlFileException;
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30 import org.tmatesoft.hg.repo.HgInvalidRevisionException;
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31 import org.tmatesoft.hg.repo.HgInvalidStateException;
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32 import org.tmatesoft.hg.repo.HgRepository;
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33 import org.tmatesoft.hg.util.Adaptable;
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36 /**
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37 * ? Single RevlogStream per file per repository with accessor to record access session (e.g. with back/forward operations),
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38 * or numerous RevlogStream with separate representation of the underlying data (cached, lazy ChunkStream)?
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39 *
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40 * @see http://mercurial.selenic.com/wiki/Revlog
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41 * @see http://mercurial.selenic.com/wiki/RevlogNG
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42 *
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43 * @author Artem Tikhomirov
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44 * @author TMate Software Ltd.
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45 */
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46 public class RevlogStream {
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48 /*
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49 * makes sense for index with inline data only - actual offset of the record in the .i file (record entry + revision * record size))
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50 *
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51 * long[] in fact (there are 8-bytes field in the revlog)
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52 * However, (a) DataAccess currently doesn't operate with long seek/length
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53 * and, of greater significance, (b) files with inlined data are designated for smaller files,
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54 * guess, about 130 Kb, and offset there won't ever break int capacity
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55 */
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56 private int[] indexRecordOffset;
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57 private int[] baseRevisions;
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58 private boolean inline = false;
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59 private final File indexFile;
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60 private File dataFile;
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61 private final DataAccessProvider dataAccess;
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63 // if we need anything else from HgRepo, might replace DAP parameter with HgRepo and query it for DAP.
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64 public RevlogStream(DataAccessProvider dap, File indexFile) {
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65 this.dataAccess = dap;
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66 this.indexFile = indexFile;
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67 }
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69 /*package*/ DataAccess getIndexStream() {
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70 // FIXME [1.1] must supply a hint that I'll need really few bytes of data (perhaps, at some offset)
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71 // to avoid mmap files when only few bytes are to be read (i.e. #dataLength())
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72 return dataAccess.createReader(indexFile);
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73 }
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75 /*package*/ DataAccess getDataStream() {
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76 return dataAccess.createReader(getDataFile());
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77 }
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79 /*package*/ DataSerializer getIndexStreamWriter() {
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80 return dataAccess.createWriter(indexFile, true);
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81 }
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83 /*package*/ DataSerializer getDataStreamWriter() {
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84 return dataAccess.createWriter(getDataFile(), true);
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85 }
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87 /**
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88 * Constructs file object that corresponds to .d revlog counterpart.
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89 * Note, it's caller responsibility to ensure this file makes any sense (i.e. check {@link #inline} attribute)
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90 */
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91 private File getDataFile() {
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92 if (dataFile == null) {
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93 final String indexName = indexFile.getName();
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94 dataFile = new File(indexFile.getParentFile(), indexName.substring(0, indexName.length() - 1) + "d");
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95 }
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96 return dataFile;
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97 }
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99 // initialize exception with the file where revlog structure information comes from
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100 public HgInvalidControlFileException initWithIndexFile(HgInvalidControlFileException ex) {
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101 return ex.setFile(indexFile);
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102 }
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103
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104 // initialize exception with the file where revlog data comes from
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105 public HgInvalidControlFileException initWithDataFile(HgInvalidControlFileException ex) {
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106 // exceptions are usually raised after read attepmt, hence inline shall be initialized
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107 // although honest approach is to call #initOutline() first
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108 return ex.setFile(inline ? indexFile : getDataFile());
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109 }
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111 /*package-private*/String getDataFileName() {
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112 // XXX a temporary solution to provide more info to fill in exceptions other than
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113 // HgInvalidControlFileException (those benefit from initWith* methods above)
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114 //
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115 // Besides, since RevlogStream represents both revlogs with user data (those with WC representative and
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116 // system data under store/data) and system-only revlogs (like changelog and manifest), there's no
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117 // easy way to supply human-friendly name of the active file (independent from whether it's index of data)
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118 return inline ? indexFile.getPath() : getDataFile().getPath();
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119 }
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120
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121 public boolean isInlineData() {
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122 initOutline();
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123 return inline;
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124 }
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125
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126 public int revisionCount() {
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127 initOutline();
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128 return baseRevisions.length;
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129 }
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130
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131 /**
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132 * @throws HgInvalidControlFileException if attempt to read index file failed
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133 * @throws HgInvalidRevisionException if revisionIndex argument doesn't represent a valid record in the revlog
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134 */
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135 public int dataLength(int revisionIndex) throws HgInvalidControlFileException, HgInvalidRevisionException {
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136 // XXX in fact, use of iterate() instead of this implementation may be quite reasonable.
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137 //
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138 revisionIndex = checkRevisionIndex(revisionIndex);
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139 DataAccess daIndex = getIndexStream();
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140 try {
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141 int recordOffset = getIndexOffsetInt(revisionIndex);
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142 daIndex.seek(recordOffset + 12); // 6+2+4
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143 int actualLen = daIndex.readInt();
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144 return actualLen;
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145 } catch (IOException ex) {
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146 throw new HgInvalidControlFileException(null, ex, indexFile).setRevisionIndex(revisionIndex);
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147 } finally {
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148 daIndex.done();
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149 }
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150 }
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151
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152 /**
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153 * Read nodeid at given index
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154 *
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155 * @throws HgInvalidControlFileException if attempt to read index file failed
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156 * @throws HgInvalidRevisionException if revisionIndex argument doesn't represent a valid record in the revlog
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157 */
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158 public byte[] nodeid(int revisionIndex) throws HgInvalidControlFileException, HgInvalidRevisionException {
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159 revisionIndex = checkRevisionIndex(revisionIndex);
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160 DataAccess daIndex = getIndexStream();
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161 try {
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162 int recordOffset = getIndexOffsetInt(revisionIndex);
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163 daIndex.seek(recordOffset + 32);
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164 byte[] rv = new byte[20];
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165 daIndex.readBytes(rv, 0, 20);
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166 return rv;
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167 } catch (IOException ex) {
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168 throw new HgInvalidControlFileException("Revision lookup failed", ex, indexFile).setRevisionIndex(revisionIndex);
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169 } finally {
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170 daIndex.done();
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171 }
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172 }
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173
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174 /**
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175 * Get link field from the index record.
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176 *
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177 * @throws HgInvalidControlFileException if attempt to read index file failed
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178 * @throws HgInvalidRevisionException if revisionIndex argument doesn't represent a valid record in the revlog
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179 */
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180 public int linkRevision(int revisionIndex) throws HgInvalidControlFileException, HgInvalidRevisionException {
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181 revisionIndex = checkRevisionIndex(revisionIndex);
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182 DataAccess daIndex = getIndexStream();
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183 try {
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184 int recordOffset = getIndexOffsetInt(revisionIndex);
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185 daIndex.seek(recordOffset + 20);
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186 int linkRev = daIndex.readInt();
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187 return linkRev;
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188 } catch (IOException ex) {
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189 throw new HgInvalidControlFileException("Linked revision lookup failed", ex, indexFile).setRevisionIndex(revisionIndex);
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190 } finally {
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191 daIndex.done();
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192 }
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193 }
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194
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195 /**
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196 * Extract base revision field from the revlog
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197 *
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198 * @throws HgInvalidControlFileException if attempt to read index file failed
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199 * @throws HgInvalidRevisionException if revisionIndex argument doesn't represent a valid record in the revlog
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200 */
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201 public int baseRevision(int revisionIndex) throws HgInvalidControlFileException, HgInvalidRevisionException {
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202 initOutline();
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203 revisionIndex = checkRevisionIndex(revisionIndex);
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204 return getBaseRevision(revisionIndex);
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205 }
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206
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207 // Perhaps, RevlogStream should be limited to use of plain int revisions for access,
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208 // while Nodeids should be kept on the level up, in Revlog. Guess, Revlog better keep
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209 // map of nodeids, and once this comes true, we may get rid of this method.
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210 // Unlike its counterpart, {@link Revlog#getLocalRevisionNumber()}, doesn't fail with exception if node not found,
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211 /**
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212 * @return integer in [0..revisionCount()) or {@link HgRepository#BAD_REVISION} if not found
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213 * @throws HgInvalidControlFileException if attempt to read index file failed
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214 */
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215 public int findRevisionIndex(Nodeid nodeid) throws HgInvalidControlFileException {
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216 // XXX this one may be implemented with iterate() once there's mechanism to stop iterations
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217 final int indexSize = revisionCount();
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218 DataAccess daIndex = getIndexStream();
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219 try {
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220 byte[] nodeidBuf = new byte[20];
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221 for (int i = 0; i < indexSize; i++) {
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222 daIndex.skip(8);
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223 int compressedLen = daIndex.readInt();
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224 daIndex.skip(20);
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225 daIndex.readBytes(nodeidBuf, 0, 20);
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226 if (nodeid.equalsTo(nodeidBuf)) {
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227 return i;
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228 }
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229 daIndex.skip(inline ? 12 + compressedLen : 12);
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230 }
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231 } catch (IOException ex) {
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232 throw new HgInvalidControlFileException("Revision lookup failed", ex, indexFile).setRevision(nodeid);
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233 } finally {
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234 daIndex.done();
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235 }
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236 return BAD_REVISION;
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237 }
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238
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239 /**
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240 * @return value suitable for the corresponding field in the new revision's header, not physical offset in the file
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241 * (which is different in case of inline revlogs)
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242 */
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243 public long newEntryOffset() {
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244 if (revisionCount() == 0) {
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245 return 0;
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246 }
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247 DataAccess daIndex = getIndexStream();
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248 int lastRev = revisionCount() - 1;
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249 try {
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250 int recordOffset = getIndexOffsetInt(lastRev);
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251 daIndex.seek(recordOffset);
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252 long value = daIndex.readLong();
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253 value = value >>> 16;
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254 int compressedLen = daIndex.readInt();
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255 return lastRev == 0 ? compressedLen : value + compressedLen;
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256 } catch (IOException ex) {
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257 throw new HgInvalidControlFileException("Linked revision lookup failed", ex, indexFile).setRevisionIndex(lastRev);
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258 } finally {
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259 daIndex.done();
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260 }
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261 }
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262
22
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263
2
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264
3
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265 // should be possible to use TIP, ALL, or -1, -2, -n notation of Hg
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266 // ? boolean needsNodeid
423
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267 public void iterate(int start, int end, boolean needData, Inspector inspector) throws HgInvalidRevisionException, HgInvalidControlFileException {
2
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268 initOutline();
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269 final int indexSize = revisionCount();
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270 if (indexSize == 0) {
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271 return;
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272 }
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273 if (end == TIP) {
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274 end = indexSize - 1;
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275 }
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276 if (start == TIP) {
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277 start = indexSize - 1;
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278 }
300
650b45d290b1 Share range check code
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279 HgInternals.checkRevlogRange(start, end, indexSize-1);
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280 // XXX may cache [start .. end] from index with a single read (pre-read)
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281
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282 ReaderN1 r = new ReaderN1(needData, inspector, dataAccess.shallMergePatches());
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283 try {
242
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284 r.start(end - start + 1);
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285 r.range(start, end);
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286 } catch (IOException ex) {
366
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287 throw new HgInvalidControlFileException(String.format("Failed reading [%d..%d]", start, end), ex, indexFile);
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288 } catch (HgInvalidControlFileException ex) {
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289 throw ex;
242
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290 } finally {
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291 r.finish();
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292 }
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293 }
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294
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295 /**
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296 * Effective alternative to {@link #iterate(int, int, boolean, Inspector) batch read}, when only few selected
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297 * revisions are of interest.
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298 * @param sortedRevisions revisions to walk, in ascending order.
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299 * @param needData whether inspector needs access to header only
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300 * @param inspector callback to process entries
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301 */
366
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302 public void iterate(int[] sortedRevisions, boolean needData, Inspector inspector) throws HgInvalidRevisionException, HgInvalidControlFileException /*REVISIT - too general exception*/ {
242
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303 final int indexSize = revisionCount();
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304 if (indexSize == 0 || sortedRevisions.length == 0) {
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305 return;
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306 }
347
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307 if (sortedRevisions[0] > indexSize) {
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308 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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309 }
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310 if (sortedRevisions[sortedRevisions.length - 1] > indexSize) {
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311 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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312 }
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313
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314 ReaderN1 r = new ReaderN1(needData, inspector, dataAccess.shallMergePatches());
242
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315 try {
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316 r.start(sortedRevisions.length);
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317 for (int i = 0; i < sortedRevisions.length; ) {
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318 int x = i;
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319 i++;
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320 while (i < sortedRevisions.length) {
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321 if (sortedRevisions[i] == sortedRevisions[i-1] + 1) {
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322 i++;
2
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323 } 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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324 break;
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325 }
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326 }
242
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327 // commitRevisions[x..i-1] are sequential
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328 if (!r.range(sortedRevisions[x], sortedRevisions[i-1])) {
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329 return;
51
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330 }
2
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331 }
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332 } catch (IOException ex) {
366
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333 final int c = sortedRevisions.length;
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334 throw new HgInvalidControlFileException(String.format("Failed reading %d revisions in [%d; %d]",c, sortedRevisions[0], sortedRevisions[c-1]), ex, indexFile);
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335 } catch (HgInvalidControlFileException ex) {
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336 // TODO post-1.0 fill HgRuntimeException with appropriate file (either index or data, depending on error source)
366
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337 throw ex;
3
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338 } finally {
242
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339 r.finish();
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340 }
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341 }
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342
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343 void revisionAdded(int revisionIndex, Nodeid revision, int baseRevisionIndex, long revisionOffset) throws HgInvalidControlFileException {
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344 if (!outlineCached()) {
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345 return;
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346 }
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347 if (baseRevisions.length != revisionIndex) {
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348 throw new HgInvalidControlFileException(String.format("New entry's index shall be %d, not %d", baseRevisions.length, revisionIndex), null, indexFile);
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349 }
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350 if (baseRevisionIndex < 0 || baseRevisionIndex > baseRevisions.length) {
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351 // baseRevisionIndex MAY be == to baseRevisions.length, it's when new revision is based on itself
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352 throw new HgInvalidControlFileException(String.format("Base revision index %d doesn't fit [0..%d] range", baseRevisionIndex, baseRevisions.length), null, indexFile);
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353 }
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354 assert revision != null;
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355 assert !revision.isNull();
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356 int[] baseRevisionsCopy = new int[baseRevisions.length + 1];
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357 System.arraycopy(baseRevisions, 0, baseRevisionsCopy, 0, baseRevisions.length);
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358 baseRevisionsCopy[baseRevisions.length] = baseRevisionIndex;
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359 baseRevisions = baseRevisionsCopy;
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360 if (inline && indexRecordOffset != null) {
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361 assert indexRecordOffset.length == revisionIndex;
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362 int[] indexRecordOffsetCopy = new int[indexRecordOffset.length + 1];
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363 System.arraycopy(indexRecordOffset, 0, indexRecordOffsetCopy, 0, indexRecordOffset.length);
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364 indexRecordOffsetCopy[indexRecordOffset.length] = offsetFieldToInlineFileOffset(revisionOffset, revisionIndex);
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365 indexRecordOffset = indexRecordOffsetCopy;
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366 }
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367 }
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368
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369 private int getBaseRevision(int revision) {
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370 return baseRevisions[revision];
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371 }
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diff changeset
372
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diff changeset
373 /**
354
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374 * @param revisionIndex shall be valid index, [0..baseRevisions.length-1].
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375 * It's advised to use {@link #checkRevisionIndex(int)} to ensure argument is correct.
198
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376 * @return offset of the revision's record in the index (.i) stream
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377 */
354
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378 private int getIndexOffsetInt(int revisionIndex) {
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379 return inline ? indexRecordOffset[revisionIndex] : revisionIndex * REVLOGV1_RECORD_SIZE;
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380 }
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381
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382 private int checkRevisionIndex(int revisionIndex) throws HgInvalidRevisionException {
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383 final int last = revisionCount() - 1;
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384 if (revisionIndex == TIP) {
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385 revisionIndex = last;
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diff changeset
386 }
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diff changeset
387 if (revisionIndex < 0 || revisionIndex > last) {
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388 throw new HgInvalidRevisionException(revisionIndex).setRevisionIndex(revisionIndex, 0, last);
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389 }
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390 return revisionIndex;
198
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391 }
539
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diff changeset
392
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393 private boolean outlineCached() {
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394 return baseRevisions != null && baseRevisions.length > 0;
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395 }
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diff changeset
396
584
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397 // translate 6-byte offset field value to physical file offset for inline revlogs
539
9edfd5a223b8 Commit: handle empty repository case
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diff changeset
398 // DOESN'T MAKE SENSE if revlog with data is separate
9edfd5a223b8 Commit: handle empty repository case
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399 private static int offsetFieldToInlineFileOffset(long offset, int recordIndex) throws HgInvalidStateException {
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400 int o = Internals.ltoi(offset);
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diff changeset
401 if (o != offset) {
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diff changeset
402 // just in case, can't happen, ever, unless HG (or some other bad tool) produces index file
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403 // with inlined data of size greater than 2 Gb.
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diff changeset
404 throw new HgInvalidStateException("Data too big, offset didn't fit to sizeof(int)");
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405 }
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diff changeset
406 return o + REVLOGV1_RECORD_SIZE * recordIndex;
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diff changeset
407 }
198
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diff changeset
408
425
48f993aa2f41 FIXMEs: exceptions, javadoc
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parents: 423
diff changeset
409 private void initOutline() throws HgInvalidControlFileException {
539
9edfd5a223b8 Commit: handle empty repository case
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diff changeset
410 if (outlineCached()) {
2
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diff changeset
411 return;
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diff changeset
412 }
9
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diff changeset
413 DataAccess da = getIndexStream();
2
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diff changeset
414 try {
202
706bcc7cfee4 Basic test for HgIncomingCommand. Fix RepositoryComparator for cases when whole repository is unknown. Respect freshly initialized (empty) repositories in general.
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parents: 198
diff changeset
415 if (da.isEmpty()) {
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416 // do not fail with exception if stream is empty, it's likely intentional
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diff changeset
417 baseRevisions = new int[0];
539
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diff changeset
418 // empty revlog, likely to be populated, indicate we start with a single file
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419 inline = true;
202
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diff changeset
420 return;
706bcc7cfee4 Basic test for HgIncomingCommand. Fix RepositoryComparator for cases when whole repository is unknown. Respect freshly initialized (empty) repositories in general.
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421 }
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diff changeset
422 int versionField = da.readInt();
170
71ddbf8603e8 Initial clone: populate given directory from a bundle. Everything but remote server access is there, albeit prototype code style
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423 da.readInt(); // just to skip next 4 bytes of offset + flags
2
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424 final int INLINEDATA = 1 << 16;
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425 inline = (versionField & INLINEDATA) != 0;
288
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426 IntVector resBases, resOffsets = null;
420
6c22bdc0bdfd Respect long offsets in revlogs
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427 int entryCountGuess = Internals.ltoi(da.longLength() / REVLOGV1_RECORD_SIZE);
288
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428 if (inline) {
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diff changeset
429 entryCountGuess >>>= 2; // pure guess, assume useful data takes 3/4 of total space
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430 resOffsets = new IntVector(entryCountGuess, 5000);
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431 }
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432 resBases = new IntVector(entryCountGuess, 5000);
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433
2
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434 long offset = 0; // first offset is always 0, thus Hg uses it for other purposes
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diff changeset
435 while(true) {
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diff changeset
436 int compressedLen = da.readInt();
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437 // 8+4 = 12 bytes total read here
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diff changeset
438 @SuppressWarnings("unused")
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diff changeset
439 int actualLen = da.readInt();
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
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diff changeset
440 int baseRevision = da.readInt();
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diff changeset
441 // 12 + 8 = 20 bytes read here
2
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parents: 0
diff changeset
442 // int linkRevision = di.readInt();
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parents: 0
diff changeset
443 // int parent1Revision = di.readInt();
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parents: 0
diff changeset
444 // int parent2Revision = di.readInt();
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diff changeset
445 // byte[] nodeid = new byte[32];
198
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diff changeset
446 resBases.add(baseRevision);
2
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parents: 0
diff changeset
447 if (inline) {
539
9edfd5a223b8 Commit: handle empty repository case
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diff changeset
448 int o = offsetFieldToInlineFileOffset(offset, resOffsets.size());
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diff changeset
449 resOffsets.add(o);
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diff changeset
450 da.skip(3*4 + 32 + compressedLen); // Check: 44 (skip) + 20 (read) = 64 (total RevlogNG record size)
2
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parents: 0
diff changeset
451 } else {
9
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
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diff changeset
452 da.skip(3*4 + 32);
2
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parents: 0
diff changeset
453 }
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents: 9
diff changeset
454 if (da.isEmpty()) {
9
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diff changeset
455 // fine, done then
288
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diff changeset
456 baseRevisions = resBases.toArray(true);
198
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diff changeset
457 if (inline) {
288
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parents: 280
diff changeset
458 indexRecordOffset = resOffsets.toArray(true);
198
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parents: 170
diff changeset
459 }
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parents: 6
diff changeset
460 break;
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents: 9
diff changeset
461 } else {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents: 9
diff changeset
462 // 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
463 long l = da.readLong();
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents: 9
diff changeset
464 offset = l >>> 16;
9
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
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parents: 6
diff changeset
465 }
2
08db726a0fb7 Shaping out low-level Hg structures
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parents: 0
diff changeset
466 }
08db726a0fb7 Shaping out low-level Hg structures
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parents: 0
diff changeset
467 } 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
468 throw new HgInvalidControlFileException("Failed to analyze revlog index", ex, indexFile);
9
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parents: 6
diff changeset
469 } finally {
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
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parents: 6
diff changeset
470 da.done();
2
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diff changeset
471 }
3
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
472 }
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
473
242
ad6a046943be Improved reading of sparse revisions from a revlog
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diff changeset
474 /**
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
475 * operation with single file open/close and multiple diverse reads.
366
189dc6dc1c3e Use exceptions to expose errors reading mercurial data
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parents: 354
diff changeset
476 * XXX initOutline might need similar extraction to keep N1 format knowledge
242
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parents: 223
diff changeset
477 */
584
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diff changeset
478 final class ReaderN1 {
242
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diff changeset
479 private final Inspector inspector;
ad6a046943be Improved reading of sparse revisions from a revlog
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diff changeset
480 private final boolean needData;
584
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diff changeset
481 private final boolean mergePatches;
242
ad6a046943be Improved reading of sparse revisions from a revlog
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diff changeset
482 private DataAccess daIndex = null, daData = null;
ad6a046943be Improved reading of sparse revisions from a revlog
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diff changeset
483 private Lifecycle.BasicCallback cb = null;
520
1ee452f31187 Experimental support for inverse direction history walking. Refactored/streamlined cancellation in HgLogCommand and down the stack
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parents: 440
diff changeset
484 private Lifecycle lifecycleListener = null;
242
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diff changeset
485 private int lastRevisionRead = BAD_REVISION;
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diff changeset
486 private DataAccess lastUserData;
584
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diff changeset
487 //
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diff changeset
488 // next are transient values, for range() use only
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diff changeset
489 private final Inflater inflater = new Inflater();
ed243b668502 Conditionally enable effective patch merge alternative for revlog reading
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parents: 580
diff changeset
490 // can share buffer between instances of InflaterDataAccess as I never read any two of them in parallel
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parents: 580
diff changeset
491 private final byte[] inflaterBuffer = new byte[10 * 1024]; // TODO consider using DAP.DEFAULT_FILE_BUFFER
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diff changeset
492 private final byte[] nodeidBuf = new byte[20];
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diff changeset
493 // revlog record fields
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diff changeset
494 private long offset;
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diff changeset
495 @SuppressWarnings("unused")
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diff changeset
496 private int flags;
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diff changeset
497 private int compressedLen;
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diff changeset
498 private int actualLen;
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diff changeset
499 private int baseRevision;
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diff changeset
500 private int linkRevision;
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diff changeset
501 private int parent1Revision;
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502 private int parent2Revision;
263
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diff changeset
503 // next are to track two major bottlenecks - patch application and actual time spent in inspector
264
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504 // private long applyTime, inspectorTime; // TIMING
584
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505
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diff changeset
506 public ReaderN1(boolean dataRequested, Inspector insp, boolean usePatchMerge) {
242
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diff changeset
507 assert insp != null;
584
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diff changeset
508 needData = dataRequested;
242
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diff changeset
509 inspector = insp;
584
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diff changeset
510 mergePatches = usePatchMerge;
242
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diff changeset
511 }
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diff changeset
512
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diff changeset
513 public void start(int totalWork) {
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diff changeset
514 daIndex = getIndexStream();
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diff changeset
515 if (needData && !inline) {
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diff changeset
516 daData = getDataStream();
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diff changeset
517 }
520
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diff changeset
518 lifecycleListener = Adaptable.Factory.getAdapter(inspector, Lifecycle.class, null);
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diff changeset
519 if (lifecycleListener != null) {
242
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diff changeset
520 cb = new Lifecycle.BasicCallback();
520
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diff changeset
521 lifecycleListener.start(totalWork, cb, cb);
242
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522 }
264
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523 // applyTime = inspectorTime = 0; // TIMING
242
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diff changeset
524 }
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diff changeset
525
520
1ee452f31187 Experimental support for inverse direction history walking. Refactored/streamlined cancellation in HgLogCommand and down the stack
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diff changeset
526 // invoked only once per instance
242
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diff changeset
527 public void finish() {
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diff changeset
528 if (lastUserData != null) {
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diff changeset
529 lastUserData.done();
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diff changeset
530 lastUserData = null;
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diff changeset
531 }
520
1ee452f31187 Experimental support for inverse direction history walking. Refactored/streamlined cancellation in HgLogCommand and down the stack
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parents: 440
diff changeset
532 if (lifecycleListener != null) {
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diff changeset
533 lifecycleListener.finish(cb);
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parents: 440
diff changeset
534 lifecycleListener = null;
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parents: 440
diff changeset
535 cb = null;
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diff changeset
536
242
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537 }
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diff changeset
538 daIndex.done();
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diff changeset
539 if (daData != null) {
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diff changeset
540 daData.done();
520
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diff changeset
541 daData = null;
242
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542 }
264
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
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diff changeset
543 // System.out.printf("applyTime:%d ms, inspectorTime: %d ms\n", applyTime, inspectorTime); // TIMING
242
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diff changeset
544 }
584
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diff changeset
545
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diff changeset
546 private void readHeaderRecord(int i) throws IOException {
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parents: 580
diff changeset
547 if (inline && needData) {
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parents: 580
diff changeset
548 // inspector reading data (though FilterDataAccess) may have affected index position
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parents: 580
diff changeset
549 daIndex.seek(getIndexOffsetInt(i));
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diff changeset
550 }
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diff changeset
551 long l = daIndex.readLong(); // 0
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parents: 580
diff changeset
552 offset = i == 0 ? 0 : (l >>> 16);
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diff changeset
553 flags = (int) (l & 0x0FFFF);
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diff changeset
554 compressedLen = daIndex.readInt(); // +8
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diff changeset
555 actualLen = daIndex.readInt(); // +12
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diff changeset
556 baseRevision = daIndex.readInt(); // +16
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diff changeset
557 linkRevision = daIndex.readInt(); // +20
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diff changeset
558 parent1Revision = daIndex.readInt();
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diff changeset
559 parent2Revision = daIndex.readInt();
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parents: 580
diff changeset
560 // Hg has 32 bytes here, uses 20 for nodeid, and keeps 12 last bytes empty
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parents: 580
diff changeset
561 daIndex.readBytes(nodeidBuf, 0, 20); // +32
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diff changeset
562 daIndex.skip(12);
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diff changeset
563 }
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564
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diff changeset
565 private boolean isPatch(int i) {
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diff changeset
566 return baseRevision != i; // the only way I found to tell if it's a patch
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diff changeset
567 }
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568
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parents: 580
diff changeset
569 private DataAccess getStoredData(int i) throws IOException {
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diff changeset
570 DataAccess userDataAccess = null;
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diff changeset
571 DataAccess streamDataAccess;
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diff changeset
572 long streamOffset;
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diff changeset
573 if (inline) {
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diff changeset
574 streamOffset = getIndexOffsetInt(i) + REVLOGV1_RECORD_SIZE;
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diff changeset
575 streamDataAccess = daIndex;
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diff changeset
576 // 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
577 daIndex.longSeek(streamOffset);
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diff changeset
578 } else {
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diff changeset
579 streamOffset = offset;
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diff changeset
580 streamDataAccess = daData;
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diff changeset
581 daData.longSeek(streamOffset);
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diff changeset
582 }
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parents: 580
diff changeset
583 if (streamDataAccess.isEmpty() || compressedLen == 0) {
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diff changeset
584 userDataAccess = new DataAccess(); // empty
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diff changeset
585 } else {
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diff changeset
586 final byte firstByte = streamDataAccess.readByte();
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diff changeset
587 if (firstByte == 0x78 /* 'x' */) {
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diff changeset
588 inflater.reset();
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diff changeset
589 userDataAccess = new InflaterDataAccess(streamDataAccess, streamOffset, compressedLen, isPatch(i) ? -1 : actualLen, inflater, inflaterBuffer);
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parents: 580
diff changeset
590 } else if (firstByte == 0x75 /* 'u' */) {
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parents: 580
diff changeset
591 userDataAccess = new FilterDataAccess(streamDataAccess, streamOffset+1, compressedLen-1);
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diff changeset
592 } else {
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diff changeset
593 // XXX Python impl in fact throws exception when there's not 'x', 'u' or '0' but I don't see reason not to return data as is
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diff changeset
594 //
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diff changeset
595 // although firstByte is already read from the streamDataAccess, FilterDataAccess#readByte would seek to
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diff changeset
596 // initial offset before first attempt to read a byte
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diff changeset
597 userDataAccess = new FilterDataAccess(streamDataAccess, streamOffset, compressedLen);
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diff changeset
598 }
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diff changeset
599 }
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diff changeset
600 return userDataAccess;
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diff changeset
601 }
263
31f67be94e71 RevlogStream - reduce number of object instances, reuse when possible
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diff changeset
602
520
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diff changeset
603 // may be invoked few times per instance life
423
9c9c442b5f2e Major refactoring of exception handling. Low-level API uses RuntimeExceptions, while checked are left for higher level
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diff changeset
604 public boolean range(int start, int end) throws IOException {
242
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diff changeset
605 int i;
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diff changeset
606 // it (i.e. replace with i >= start)
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diff changeset
607 if (needData && (i = getBaseRevision(start)) < start) {
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diff changeset
608 // if lastRevisionRead in [baseRevision(start), start) can reuse lastUserData
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diff changeset
609 // doesn't make sense to reuse if lastRevisionRead == start (too much to change in the cycle below).
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diff changeset
610 if (lastRevisionRead != BAD_REVISION && i <= lastRevisionRead && lastRevisionRead < start) {
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diff changeset
611 i = lastRevisionRead + 1; // start with first not-yet-read revision
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diff changeset
612 } else {
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diff changeset
613 if (lastUserData != null) {
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diff changeset
614 lastUserData.done();
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diff changeset
615 lastUserData = null;
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diff changeset
616 }
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617 }
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618 } else {
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619 // don't need to clean lastUserData as it's always null when !needData
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620 i = start;
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621 }
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622
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623 daIndex.seek(getIndexOffsetInt(i));
258
e5776067b3b8 Reduce number of objects instantiated on revlog read
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624 //
584
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625 // reuse instance, do not normalize it as patches from the stream are unlikely to need it
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diff changeset
626 final Patch patch = new Patch(false);
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627 //
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628 if (needData && mergePatches && start-i > 2) {
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diff changeset
629 // i+1 == start just reads lastUserData, i+2 == start applies one patch - not worth dedicated effort
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630 Patch ultimatePatch = new Patch(true);
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diff changeset
631 for ( ; i < start; i++) {
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diff changeset
632 readHeaderRecord(i);
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633 DataAccess userDataAccess = getStoredData(i);
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634 if (lastUserData == null) {
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diff changeset
635 assert !isPatch(i);
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636 lastUserData = userDataAccess;
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diff changeset
637 } else {
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diff changeset
638 assert isPatch(i); // i < start and i == getBaseRevision()
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639 patch.read(userDataAccess);
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640 userDataAccess.done();
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641 // I assume empty patches are applied ok
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diff changeset
642 ultimatePatch = ultimatePatch.apply(patch);
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diff changeset
643 patch.clear();
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644 }
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645 }
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646 lastUserData.reset();
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diff changeset
647 byte[] userData = ultimatePatch.apply(lastUserData, actualLen);
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648 ultimatePatch.clear();
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649 lastUserData.done();
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650 lastUserData = new ByteArrayDataAccess(userData);
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651 }
263
31f67be94e71 RevlogStream - reduce number of object instances, reuse when possible
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652 //
242
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653
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654 for (; i <= end; i++ ) {
584
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655 readHeaderRecord(i);
242
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656 DataAccess userDataAccess = null;
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657 if (needData) {
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658 userDataAccess = getStoredData(i);
397
5e95b0da26f2 Issue 24: IAE, Underflow in FilterDataAccess. Issue 26:UnsupportedOperationException when patching empty base revision. Tests
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659 // userDataAccess is revision content, either complete revision, patch of a previous content, or an empty patch
584
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660 if (isPatch(i)) {
242
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661 // this is a patch
397
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662 if (userDataAccess.isEmpty()) {
5e95b0da26f2 Issue 24: IAE, Underflow in FilterDataAccess. Issue 26:UnsupportedOperationException when patching empty base revision. Tests
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663 // 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
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664 // 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
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665 // 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
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666 //
5e95b0da26f2 Issue 24: IAE, Underflow in FilterDataAccess. Issue 26:UnsupportedOperationException when patching empty base revision. Tests
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667 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
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668 userDataAccess = lastUserData;
5e95b0da26f2 Issue 24: IAE, Underflow in FilterDataAccess. Issue 26:UnsupportedOperationException when patching empty base revision. Tests
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diff changeset
669 } else {
5e95b0da26f2 Issue 24: IAE, Underflow in FilterDataAccess. Issue 26:UnsupportedOperationException when patching empty base revision. Tests
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diff changeset
670 patch.read(userDataAccess);
5e95b0da26f2 Issue 24: IAE, Underflow in FilterDataAccess. Issue 26:UnsupportedOperationException when patching empty base revision. Tests
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diff changeset
671 userDataAccess.done();
5e95b0da26f2 Issue 24: IAE, Underflow in FilterDataAccess. Issue 26:UnsupportedOperationException when patching empty base revision. Tests
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672 //
5e95b0da26f2 Issue 24: IAE, Underflow in FilterDataAccess. Issue 26:UnsupportedOperationException when patching empty base revision. Tests
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diff changeset
673 // 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
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674 // 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
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diff changeset
675 // 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
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diff changeset
676 lastUserData.reset();
5e95b0da26f2 Issue 24: IAE, Underflow in FilterDataAccess. Issue 26:UnsupportedOperationException when patching empty base revision. Tests
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677 // final long startMeasuring = System.currentTimeMillis(); // TIMING
5e95b0da26f2 Issue 24: IAE, Underflow in FilterDataAccess. Issue 26:UnsupportedOperationException when patching empty base revision. Tests
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diff changeset
678 byte[] userData = patch.apply(lastUserData, actualLen);
5e95b0da26f2 Issue 24: IAE, Underflow in FilterDataAccess. Issue 26:UnsupportedOperationException when patching empty base revision. Tests
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679 // applyTime += (System.currentTimeMillis() - startMeasuring); // TIMING
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diff changeset
680 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
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diff changeset
681 userDataAccess = new ByteArrayDataAccess(userData);
5e95b0da26f2 Issue 24: IAE, Underflow in FilterDataAccess. Issue 26:UnsupportedOperationException when patching empty base revision. Tests
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diff changeset
682 }
242
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diff changeset
683 }
ad6a046943be Improved reading of sparse revisions from a revlog
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diff changeset
684 } else {
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diff changeset
685 if (inline) {
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diff changeset
686 daIndex.skip(compressedLen);
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diff changeset
687 }
ad6a046943be Improved reading of sparse revisions from a revlog
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diff changeset
688 }
329
694ebabb5cb3 Refactor revlog patch mechanism, towards patch merging
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 300
diff changeset
689 if (i >= start) {
264
6bb5e7ed051a Optimize memory usage (reduce number of objects instantiated) when pooling file names and nodeids during manifest parsing
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parents: 263
diff changeset
690 // final long startMeasuring = System.currentTimeMillis(); // TIMING
242
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diff changeset
691 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
692 // inspectorTime += (System.currentTimeMillis() - startMeasuring); // TIMING
242
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diff changeset
693 }
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diff changeset
694 if (cb != null) {
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
695 if (cb.isStopped()) {
ad6a046943be Improved reading of sparse revisions from a revlog
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diff changeset
696 return false;
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
697 }
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
698 }
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
699 if (userDataAccess != null) {
263
31f67be94e71 RevlogStream - reduce number of object instances, reuse when possible
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parents: 258
diff changeset
700 userDataAccess.reset(); // not sure this is necessary here, as lastUserData would get reset anyway before next use.
242
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diff changeset
701 }
397
5e95b0da26f2 Issue 24: IAE, Underflow in FilterDataAccess. Issue 26:UnsupportedOperationException when patching empty base revision. Tests
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parents: 377
diff changeset
702 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
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parents: 377
diff changeset
703 // 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
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parents: 377
diff changeset
704 // 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
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parents: 258
diff changeset
705 lastUserData.done();
31f67be94e71 RevlogStream - reduce number of object instances, reuse when possible
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diff changeset
706 }
31f67be94e71 RevlogStream - reduce number of object instances, reuse when possible
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diff changeset
707 lastUserData = userDataAccess;
242
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diff changeset
708 }
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diff changeset
709 lastRevisionRead = end;
ad6a046943be Improved reading of sparse revisions from a revlog
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diff changeset
710 return true;
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diff changeset
711 }
ad6a046943be Improved reading of sparse revisions from a revlog
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diff changeset
712 }
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
713
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
714
77
c677e1593919 Moved RevlogStream implementation into .internal
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 74
diff changeset
715 public interface Inspector {
c677e1593919 Moved RevlogStream implementation into .internal
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diff changeset
716 // XXX boolean retVal to indicate whether to continue?
157
d5268ca7715b Merged branch wrap-data-access into default for resource-friendly data access. Updated API to promote that friendliness to clients (channels, not byte[]). More exceptions
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 53 102
diff changeset
717 // TODO specify nodeid and data length, and reuse policy (i.e. if revlog stream doesn't reuse nodeid[] for each call)
d5268ca7715b Merged branch wrap-data-access into default for resource-friendly data access. Updated API to promote that friendliness to clients (channels, not byte[]). More exceptions
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parents: 53 102
diff changeset
718 // implementers shall not invoke DataAccess.done(), it's accomplished by #iterate at appropraite moment
423
9c9c442b5f2e Major refactoring of exception handling. Low-level API uses RuntimeExceptions, while checked are left for higher level
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 420
diff changeset
719 void next(int revisionIndex, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[/*20*/] nodeid, DataAccess data);
3
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
720 }
539
9edfd5a223b8 Commit: handle empty repository case
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 538
diff changeset
721
0
dbd663faec1f Basic changelog parsing
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
722 }