annotate src/org/tmatesoft/hg/internal/RevlogStream.java @ 530:0f6fa88e2162

Towards commit command: refactor clone, extract pieces to reuse. Describe a defect discovered when bundle has few patches with 0,0 parents
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 23 Jan 2013 17:46:12 +0100
parents 1ee452f31187
children 243202f1bda5
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1 /*
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2 * Copyright (c) 2010-2013 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.internal;
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18
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19 import static org.tmatesoft.hg.repo.HgRepository.BAD_REVISION;
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20 import static org.tmatesoft.hg.repo.HgRepository.TIP;
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21 import static org.tmatesoft.hg.internal.Internals.REVLOGV1_RECORD_SIZE;
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23 import java.io.File;
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24 import java.io.IOException;
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25 import java.util.zip.Inflater;
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27 import org.tmatesoft.hg.core.Nodeid;
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28 import org.tmatesoft.hg.repo.HgInternals;
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29 import org.tmatesoft.hg.repo.HgInvalidControlFileException;
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30 import org.tmatesoft.hg.repo.HgInvalidRevisionException;
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31 import org.tmatesoft.hg.repo.HgInvalidStateException;
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32 import org.tmatesoft.hg.repo.HgRepository;
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33 import org.tmatesoft.hg.util.Adaptable;
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36 /**
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37 * ? Single RevlogStream per file per repository with accessor to record access session (e.g. with back/forward operations),
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38 * or numerous RevlogStream with separate representation of the underlying data (cached, lazy ChunkStream)?
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39 *
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40 * @see http://mercurial.selenic.com/wiki/Revlog
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41 * @see http://mercurial.selenic.com/wiki/RevlogNG
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42 *
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43 * @author Artem Tikhomirov
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44 * @author TMate Software Ltd.
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45 */
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46 public class RevlogStream {
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47
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48 /*
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49 * makes sense for index with inline data only - actual offset of the record in the .i file (record entry + revision * record size))
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50 *
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51 * long[] in fact (there are 8-bytes field in the revlog)
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52 * However, (a) DataAccess currently doesn't operate with long seek/length
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53 * and, of greater significance, (b) files with inlined data are designated for smaller files,
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54 * guess, about 130 Kb, and offset there won't ever break int capacity
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55 */
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56 private int[] indexRecordOffset;
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57 private int[] baseRevisions;
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58 private boolean inline = false;
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59 private final File indexFile;
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60 private File dataFile;
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61 private final DataAccessProvider dataAccess;
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63 // if we need anything else from HgRepo, might replace DAP parameter with HgRepo and query it for DAP.
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64 public RevlogStream(DataAccessProvider dap, File indexFile) {
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65 this.dataAccess = dap;
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66 this.indexFile = indexFile;
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67 }
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68
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69 /*package*/ DataAccess getIndexStream() {
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70 // TODO post 1.0 may 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.create(indexFile);
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73 }
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75 /*package*/ DataAccess getDataStream() {
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76 return dataAccess.create(getDataFile());
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77 }
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79 /**
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80 * Constructs file object that corresponds to .d revlog counterpart.
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81 * Note, it's caller responsibility to ensure this file makes any sense (i.e. check {@link #inline} attribute)
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82 */
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83 private File getDataFile() {
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84 if (dataFile == null) {
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85 final String indexName = indexFile.getName();
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86 dataFile = new File(indexFile.getParentFile(), indexName.substring(0, indexName.length() - 1) + "d");
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87 }
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88 return dataFile;
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89 }
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91 // initialize exception with the file where revlog structure information comes from
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92 public HgInvalidControlFileException initWithIndexFile(HgInvalidControlFileException ex) {
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93 return ex.setFile(indexFile);
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94 }
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96 // initialize exception with the file where revlog data comes from
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97 public HgInvalidControlFileException initWithDataFile(HgInvalidControlFileException ex) {
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98 // exceptions are usually raised after read attepmt, hence inline shall be initialized
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99 // although honest approach is to call #initOutline() first
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100 return ex.setFile(inline ? indexFile : getDataFile());
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101 }
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102
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103
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104 public int revisionCount() {
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105 initOutline();
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106 return baseRevisions.length;
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107 }
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108
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109 /**
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110 * @throws HgInvalidControlFileException if attempt to read index file failed
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111 * @throws HgInvalidRevisionException if revisionIndex argument doesn't represent a valid record in the revlog
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112 */
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113 public int dataLength(int revisionIndex) throws HgInvalidControlFileException, HgInvalidRevisionException {
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114 // XXX in fact, use of iterate() instead of this implementation may be quite reasonable.
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115 //
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116 revisionIndex = checkRevisionIndex(revisionIndex);
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117 DataAccess daIndex = getIndexStream();
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118 try {
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119 int recordOffset = getIndexOffsetInt(revisionIndex);
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120 daIndex.seek(recordOffset + 12); // 6+2+4
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121 int actualLen = daIndex.readInt();
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122 return actualLen;
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123 } catch (IOException ex) {
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124 throw new HgInvalidControlFileException(null, ex, indexFile).setRevisionIndex(revisionIndex);
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125 } finally {
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126 daIndex.done();
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127 }
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128 }
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129
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130 /**
354
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131 * Read nodeid at given index
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132 *
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133 * @throws HgInvalidControlFileException if attempt to read index file failed
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134 * @throws HgInvalidRevisionException if revisionIndex argument doesn't represent a valid record in the revlog
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135 */
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136 public byte[] nodeid(int revisionIndex) throws HgInvalidControlFileException, HgInvalidRevisionException {
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137 revisionIndex = checkRevisionIndex(revisionIndex);
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138 DataAccess daIndex = getIndexStream();
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139 try {
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140 int recordOffset = getIndexOffsetInt(revisionIndex);
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141 daIndex.seek(recordOffset + 32);
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142 byte[] rv = new byte[20];
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143 daIndex.readBytes(rv, 0, 20);
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144 return rv;
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145 } catch (IOException ex) {
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146 throw new HgInvalidControlFileException("Revision lookup failed", 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 * Get link field from the index record.
354
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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 int linkRevision(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 + 20);
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164 int linkRev = daIndex.readInt();
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165 return linkRev;
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166 } catch (IOException ex) {
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167 throw new HgInvalidControlFileException("Linked revision lookup failed", ex, indexFile).setRevisionIndex(revisionIndex);
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168 } finally {
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169 daIndex.done();
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170 }
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171 }
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172
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173 // Perhaps, RevlogStream should be limited to use of plain int revisions for access,
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174 // while Nodeids should be kept on the level up, in Revlog. Guess, Revlog better keep
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175 // map of nodeids, and once this comes true, we may get rid of this method.
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176 // Unlike its counterpart, {@link Revlog#getLocalRevisionNumber()}, doesn't fail with exception if node not found,
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177 /**
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178 * @return integer in [0..revisionCount()) or {@link HgRepository#BAD_REVISION} if not found
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179 * @throws HgInvalidControlFileException if attempt to read index file failed
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180 */
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181 public int findRevisionIndex(Nodeid nodeid) throws HgInvalidControlFileException {
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182 // XXX this one may be implemented with iterate() once there's mechanism to stop iterations
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183 final int indexSize = revisionCount();
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184 DataAccess daIndex = getIndexStream();
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185 try {
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186 byte[] nodeidBuf = new byte[20];
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187 for (int i = 0; i < indexSize; i++) {
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188 daIndex.skip(8);
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189 int compressedLen = daIndex.readInt();
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190 daIndex.skip(20);
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191 daIndex.readBytes(nodeidBuf, 0, 20);
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192 if (nodeid.equalsTo(nodeidBuf)) {
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193 return i;
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194 }
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195 daIndex.skip(inline ? 12 + compressedLen : 12);
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196 }
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197 } catch (IOException ex) {
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198 throw new HgInvalidControlFileException("Revision lookup failed", ex, indexFile).setRevision(nodeid);
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199 } finally {
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200 daIndex.done();
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201 }
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202 return BAD_REVISION;
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203 }
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204
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205
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206 // should be possible to use TIP, ALL, or -1, -2, -n notation of Hg
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207 // ? boolean needsNodeid
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208 public void iterate(int start, int end, boolean needData, Inspector inspector) throws HgInvalidRevisionException, HgInvalidControlFileException {
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209 initOutline();
198
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210 final int indexSize = revisionCount();
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211 if (indexSize == 0) {
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212 return;
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213 }
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214 if (end == TIP) {
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215 end = indexSize - 1;
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216 }
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217 if (start == TIP) {
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218 start = indexSize - 1;
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219 }
300
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220 HgInternals.checkRevlogRange(start, end, indexSize-1);
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221 // XXX may cache [start .. end] from index with a single read (pre-read)
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222
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223 ReaderN1 r = new ReaderN1(needData, inspector);
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224 try {
242
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225 r.start(end - start + 1);
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226 r.range(start, end);
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227 } catch (IOException ex) {
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228 throw new HgInvalidControlFileException(String.format("Failed reading [%d..%d]", start, end), ex, indexFile);
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229 } catch (HgInvalidControlFileException ex) {
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230 throw ex;
242
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231 } finally {
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232 r.finish();
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233 }
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234 }
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235
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236 /**
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237 * Effective alternative to {@link #iterate(int, int, boolean, Inspector) batch read}, when only few selected
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238 * revisions are of interest.
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239 * @param sortedRevisions revisions to walk, in ascending order.
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240 * @param needData whether inspector needs access to header only
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241 * @param inspector callback to process entries
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242 */
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243 public void iterate(int[] sortedRevisions, boolean needData, Inspector inspector) throws HgInvalidRevisionException, HgInvalidControlFileException /*REVISIT - too general exception*/ {
242
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244 final int indexSize = revisionCount();
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245 if (indexSize == 0 || sortedRevisions.length == 0) {
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diff changeset
246 return;
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parents: 223
diff changeset
247 }
347
8da7ade36c57 Add specific IAE subclass to handle wrong (e.g. outdated after rollback) revisions
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parents: 329
diff changeset
248 if (sortedRevisions[0] > indexSize) {
8da7ade36c57 Add specific IAE subclass to handle wrong (e.g. outdated after rollback) revisions
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parents: 329
diff changeset
249 throw new HgInvalidRevisionException(String.format("Can't iterate [%d, %d] in range [0..%d]", sortedRevisions[0], sortedRevisions[sortedRevisions.length - 1], indexSize), null, sortedRevisions[0]);
8da7ade36c57 Add specific IAE subclass to handle wrong (e.g. outdated after rollback) revisions
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parents: 329
diff changeset
250 }
8da7ade36c57 Add specific IAE subclass to handle wrong (e.g. outdated after rollback) revisions
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 329
diff changeset
251 if (sortedRevisions[sortedRevisions.length - 1] > indexSize) {
8da7ade36c57 Add specific IAE subclass to handle wrong (e.g. outdated after rollback) revisions
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parents: 329
diff changeset
252 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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parents: 223
diff changeset
253 }
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
254
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
255 ReaderN1 r = new ReaderN1(needData, inspector);
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
256 try {
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
257 r.start(sortedRevisions.length);
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parents: 223
diff changeset
258 for (int i = 0; i < sortedRevisions.length; ) {
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parents: 223
diff changeset
259 int x = i;
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
260 i++;
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parents: 223
diff changeset
261 while (i < sortedRevisions.length) {
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
262 if (sortedRevisions[i] == sortedRevisions[i-1] + 1) {
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
263 i++;
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
264 } else {
217
e39cf474ef94 Experimental support to mix-in start and end events for inspectors. Additionally, Lifecycle may serve as iteration control
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 202
diff changeset
265 break;
e39cf474ef94 Experimental support to mix-in start and end events for inspectors. Additionally, Lifecycle may serve as iteration control
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 202
diff changeset
266 }
e39cf474ef94 Experimental support to mix-in start and end events for inspectors. Additionally, Lifecycle may serve as iteration control
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 202
diff changeset
267 }
242
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
268 // commitRevisions[x..i-1] are sequential
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
269 if (!r.range(sortedRevisions[x], sortedRevisions[i-1])) {
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
270 return;
51
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 49
diff changeset
271 }
2
08db726a0fb7 Shaping out low-level Hg structures
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parents: 0
diff changeset
272 }
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
273 } catch (IOException ex) {
366
189dc6dc1c3e Use exceptions to expose errors reading mercurial data
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 354
diff changeset
274 final int c = sortedRevisions.length;
189dc6dc1c3e Use exceptions to expose errors reading mercurial data
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 354
diff changeset
275 throw new HgInvalidControlFileException(String.format("Failed reading %d revisions in [%d; %d]",c, sortedRevisions[0], sortedRevisions[c-1]), ex, indexFile);
189dc6dc1c3e Use exceptions to expose errors reading mercurial data
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 354
diff changeset
276 } catch (HgInvalidControlFileException 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
277 // TODO post-1.0 fill HgRuntimeException with appropriate file (either index or data, depending on error source)
366
189dc6dc1c3e Use exceptions to expose errors reading mercurial data
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parents: 354
diff changeset
278 throw ex;
3
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
279 } finally {
242
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
280 r.finish();
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
281 }
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
282 }
198
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
283
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
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parents: 170
diff changeset
284 private int getBaseRevision(int revision) {
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
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parents: 170
diff changeset
285 return baseRevisions[revision];
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
286 }
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
287
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
288 /**
354
5f9073eabf06 Propagate errors with exceptions up to a end client
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parents: 347
diff changeset
289 * @param revisionIndex shall be valid index, [0..baseRevisions.length-1].
5f9073eabf06 Propagate errors with exceptions up to a end client
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parents: 347
diff changeset
290 * It's advised to use {@link #checkRevisionIndex(int)} to ensure argument is correct.
198
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
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parents: 170
diff changeset
291 * @return offset of the revision's record in the index (.i) stream
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
292 */
354
5f9073eabf06 Propagate errors with exceptions up to a end client
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 347
diff changeset
293 private int getIndexOffsetInt(int revisionIndex) {
5f9073eabf06 Propagate errors with exceptions up to a end client
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 347
diff changeset
294 return inline ? indexRecordOffset[revisionIndex] : revisionIndex * REVLOGV1_RECORD_SIZE;
5f9073eabf06 Propagate errors with exceptions up to a end client
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parents: 347
diff changeset
295 }
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parents: 347
diff changeset
296
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diff changeset
297 private int checkRevisionIndex(int revisionIndex) throws HgInvalidRevisionException {
5f9073eabf06 Propagate errors with exceptions up to a end client
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parents: 347
diff changeset
298 final int last = revisionCount() - 1;
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parents: 347
diff changeset
299 if (revisionIndex == TIP) {
5f9073eabf06 Propagate errors with exceptions up to a end client
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parents: 347
diff changeset
300 revisionIndex = last;
5f9073eabf06 Propagate errors with exceptions up to a end client
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 347
diff changeset
301 }
5f9073eabf06 Propagate errors with exceptions up to a end client
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 347
diff changeset
302 if (revisionIndex < 0 || revisionIndex > last) {
5f9073eabf06 Propagate errors with exceptions up to a end client
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 347
diff changeset
303 throw new HgInvalidRevisionException(revisionIndex).setRevisionIndex(revisionIndex, 0, last);
5f9073eabf06 Propagate errors with exceptions up to a end client
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 347
diff changeset
304 }
5f9073eabf06 Propagate errors with exceptions up to a end client
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 347
diff changeset
305 return revisionIndex;
198
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
306 }
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
307
425
48f993aa2f41 FIXMEs: exceptions, javadoc
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 423
diff changeset
308 private void initOutline() throws HgInvalidControlFileException {
198
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
309 if (baseRevisions != null && baseRevisions.length > 0) {
2
08db726a0fb7 Shaping out low-level Hg structures
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parents: 0
diff changeset
310 return;
08db726a0fb7 Shaping out low-level Hg structures
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parents: 0
diff changeset
311 }
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
312 DataAccess da = getIndexStream();
2
08db726a0fb7 Shaping out low-level Hg structures
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parents: 0
diff changeset
313 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
314 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
315 // 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
316 baseRevisions = new int[0];
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
317 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
318 }
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
319 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
320 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
321 final int INLINEDATA = 1 << 16;
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
322 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
323 IntVector resBases, resOffsets = null;
420
6c22bdc0bdfd Respect long offsets in revlogs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 398
diff changeset
324 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
325 if (inline) {
b11f6a08f748 Avoid boxing int values and list resizes on revlog read
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 280
diff changeset
326 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
327 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
328 }
b11f6a08f748 Avoid boxing int values and list resizes on revlog read
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 280
diff changeset
329 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
330
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
331 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
332 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
333 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
334 // 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
335 @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
336 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
337 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
338 // 12 + 8 = 20 bytes read here
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
339 // int linkRevision = di.readInt();
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
340 // int parent1Revision = di.readInt();
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
341 // int parent2Revision = di.readInt();
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
342 // 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
343 resBases.add(baseRevision);
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
344 if (inline) {
420
6c22bdc0bdfd Respect long offsets in revlogs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 398
diff changeset
345 int o = Internals.ltoi(offset);
198
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
346 if (o != offset) {
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
347 // just in case, can't happen, ever, unless HG (or some other bad tool) produces index file
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
348 // with inlined data of size greater than 2 Gb.
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
349 throw new HgInvalidStateException("Data too big, offset didn't fit to sizeof(int)");
198
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
350 }
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
351 resOffsets.add(o + REVLOGV1_RECORD_SIZE * resOffsets.size());
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
352 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
353 } 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
354 da.skip(3*4 + 32);
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
355 }
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 9
diff changeset
356 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
357 // 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
358 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
359 if (inline) {
288
b11f6a08f748 Avoid boxing int values and list resizes on revlog read
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 280
diff changeset
360 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
361 }
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
362 break;
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 9
diff changeset
363 } else {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 9
diff changeset
364 // start reading next record
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365 long l = da.readLong();
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366 offset = l >>> 16;
9
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367 }
2
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368 }
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369 } catch (IOException ex) {
423
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370 throw new HgInvalidControlFileException("Failed to analyze revlog index", ex, indexFile);
9
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371 } finally {
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372 da.done();
2
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373 }
3
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374 }
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375
242
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376 /**
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377 * operation with single file open/close and multiple diverse reads.
366
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378 * XXX initOutline might need similar extraction to keep N1 format knowledge
242
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379 */
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380 class ReaderN1 {
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381 private final Inspector inspector;
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382 private final boolean needData;
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383 private DataAccess daIndex = null, daData = null;
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384 private Lifecycle.BasicCallback cb = null;
520
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385 private Lifecycle lifecycleListener = null;
242
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386 private int lastRevisionRead = BAD_REVISION;
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387 private DataAccess lastUserData;
263
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388 // next are to track two major bottlenecks - patch application and actual time spent in inspector
264
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389 // private long applyTime, inspectorTime; // TIMING
263
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390
242
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391
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392 public ReaderN1(boolean needData, Inspector insp) {
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393 assert insp != null;
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394 this.needData = needData;
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395 inspector = insp;
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396 }
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397
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398 public void start(int totalWork) {
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399 daIndex = getIndexStream();
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400 if (needData && !inline) {
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401 daData = getDataStream();
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402 }
520
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403 lifecycleListener = Adaptable.Factory.getAdapter(inspector, Lifecycle.class, null);
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404 if (lifecycleListener != null) {
242
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405 cb = new Lifecycle.BasicCallback();
520
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406 lifecycleListener.start(totalWork, cb, cb);
242
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407 }
264
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408 // applyTime = inspectorTime = 0; // TIMING
242
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409 }
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410
520
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411 // invoked only once per instance
242
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412 public void finish() {
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413 if (lastUserData != null) {
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414 lastUserData.done();
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415 lastUserData = null;
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416 }
520
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417 if (lifecycleListener != null) {
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418 lifecycleListener.finish(cb);
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419 lifecycleListener = null;
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420 cb = null;
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421
242
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422 }
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423 daIndex.done();
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424 if (daData != null) {
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425 daData.done();
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426 daData = null;
242
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427 }
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428 // System.out.printf("applyTime:%d ms, inspectorTime: %d ms\n", applyTime, inspectorTime); // TIMING
242
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429 }
263
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430
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431 // may be invoked few times per instance life
423
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432 public boolean range(int start, int end) throws IOException {
242
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433 byte[] nodeidBuf = new byte[20];
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434 int i;
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435 // it (i.e. replace with i >= start)
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436 if (needData && (i = getBaseRevision(start)) < start) {
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437 // if lastRevisionRead in [baseRevision(start), start) can reuse lastUserData
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438 // doesn't make sense to reuse if lastRevisionRead == start (too much to change in the cycle below).
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439 if (lastRevisionRead != BAD_REVISION && i <= lastRevisionRead && lastRevisionRead < start) {
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440 i = lastRevisionRead + 1; // start with first not-yet-read revision
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441 } else {
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442 if (lastUserData != null) {
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443 lastUserData.done();
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444 lastUserData = null;
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445 }
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446 }
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447 } else {
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448 // don't need to clean lastUserData as it's always null when !needData
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449 i = start;
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450 }
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451
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452 daIndex.seek(getIndexOffsetInt(i));
258
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453 //
263
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454 // reuse some instances
329
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455 final Patch patch = new Patch();
263
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456 final Inflater inflater = new Inflater();
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457 // can share buffer between instances of InflaterDataAccess as I never read any two of them in parallel
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458 final byte[] inflaterBuffer = new byte[1024];
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459 //
242
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460
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461 for (; i <= end; i++ ) {
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462 if (inline && needData) {
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463 // inspector reading data (though FilterDataAccess) may have affected index position
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464 daIndex.seek(getIndexOffsetInt(i));
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465 }
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466 long l = daIndex.readLong(); // 0
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467 long offset = i == 0 ? 0 : (l >>> 16);
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468 @SuppressWarnings("unused")
420
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469 int flags = (int) (l & 0x0FFFF);
242
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470 int compressedLen = daIndex.readInt(); // +8
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471 int actualLen = daIndex.readInt(); // +12
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472 int baseRevision = daIndex.readInt(); // +16
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473 int linkRevision = daIndex.readInt(); // +20
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474 int parent1Revision = daIndex.readInt();
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475 int parent2Revision = daIndex.readInt();
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476 // Hg has 32 bytes here, uses 20 for nodeid, and keeps 12 last bytes empty
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477 daIndex.readBytes(nodeidBuf, 0, 20); // +32
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478 daIndex.skip(12);
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479 DataAccess userDataAccess = null;
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480 if (needData) {
420
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481 long streamOffset;
242
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482 DataAccess streamDataAccess;
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483 if (inline) {
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484 streamDataAccess = daIndex;
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485 streamOffset = getIndexOffsetInt(i) + REVLOGV1_RECORD_SIZE; // don't need to do seek as it's actual position in the index stream
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486 } else {
420
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487 streamOffset = offset;
242
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488 streamDataAccess = daData;
420
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489 daData.longSeek(streamOffset);
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490 }
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491 final boolean patchToPrevious = baseRevision != i; // the only way I found to tell if it's a patch
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492 if (streamDataAccess.isEmpty() || compressedLen == 0) {
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493 userDataAccess = new DataAccess(); // empty
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494 } else {
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495 final byte firstByte = streamDataAccess.readByte();
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496 if (firstByte == 0x78 /* 'x' */) {
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497 inflater.reset();
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498 userDataAccess = new InflaterDataAccess(streamDataAccess, streamOffset, compressedLen, patchToPrevious ? -1 : actualLen, inflater, inflaterBuffer);
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499 } else if (firstByte == 0x75 /* 'u' */) {
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500 userDataAccess = new FilterDataAccess(streamDataAccess, streamOffset+1, compressedLen-1);
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501 } else {
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502 // 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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503 //
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504 // although firstByte is already read from the streamDataAccess, FilterDataAccess#readByte would seek to
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505 // initial offset before first attempt to read a byte
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506 userDataAccess = new FilterDataAccess(streamDataAccess, streamOffset, compressedLen);
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507 }
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508 }
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509 // userDataAccess is revision content, either complete revision, patch of a previous content, or an empty patch
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510 if (patchToPrevious) {
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511 // this is a patch
397
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512 if (userDataAccess.isEmpty()) {
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513 // Issue 22, empty patch to an empty base revision
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514 // Issue 24, empty patch to non-empty base revision
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515 // empty patch modifies nothing, use content of a previous revision (shall present - it's a patch here)
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516 //
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517 assert lastUserData.length() == actualLen; // with no patch, data size shall be the same
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518 userDataAccess = lastUserData;
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519 } else {
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520 patch.read(userDataAccess);
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521 userDataAccess.done();
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522 //
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523 // it shall be reset at the end of prev iteration, when it got assigned from userDataAccess
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524 // however, actual userDataAccess and lastUserData may share Inflater object, which needs to be reset
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525 // Alternatively, userDataAccess.done() above may be responsible to reset Inflater (if it's InflaterDataAccess)
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526 lastUserData.reset();
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527 // final long startMeasuring = System.currentTimeMillis(); // TIMING
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528 byte[] userData = patch.apply(lastUserData, actualLen);
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529 // applyTime += (System.currentTimeMillis() - startMeasuring); // TIMING
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530 patch.clear(); // do not keep any reference, allow byte[] data to be gc'd
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531 userDataAccess = new ByteArrayDataAccess(userData);
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532 }
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533 }
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534 } else {
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535 if (inline) {
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536 daIndex.skip(compressedLen);
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537 }
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538 }
329
694ebabb5cb3 Refactor revlog patch mechanism, towards patch merging
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539 if (i >= start) {
264
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540 // final long startMeasuring = System.currentTimeMillis(); // TIMING
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541 inspector.next(i, actualLen, baseRevision, linkRevision, parent1Revision, parent2Revision, nodeidBuf, userDataAccess);
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542 // inspectorTime += (System.currentTimeMillis() - startMeasuring); // TIMING
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543 }
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544 if (cb != null) {
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545 if (cb.isStopped()) {
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546 return false;
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547 }
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548 }
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549 if (userDataAccess != null) {
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550 userDataAccess.reset(); // not sure this is necessary here, as lastUserData would get reset anyway before next use.
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551 }
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552 if (lastUserData != null && lastUserData != userDataAccess /* empty patch case, reuse of recent data in actual revision */) {
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553 // release lastUserData only if we didn't reuse it in actual revision due to empty patch:
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554 // empty patch means we have previous revision and didn't alter it with a patch, hence use lastUserData for userDataAccess above
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555 lastUserData.done();
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556 }
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557 lastUserData = userDataAccess;
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558 }
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559 lastRevisionRead = end;
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560 return true;
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561 }
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562 }
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563
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564
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c677e1593919 Moved RevlogStream implementation into .internal
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565 public interface Inspector {
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566 // XXX boolean retVal to indicate whether to continue?
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567 // TODO specify nodeid and data length, and reuse policy (i.e. if revlog stream doesn't reuse nodeid[] for each call)
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568 // implementers shall not invoke DataAccess.done(), it's accomplished by #iterate at appropraite moment
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569 void next(int revisionIndex, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[/*20*/] nodeid, DataAccess data);
3
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
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570 }
0
dbd663faec1f Basic changelog parsing
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571 }