annotate src/org/tmatesoft/hg/internal/RevlogStream.java @ 526:2f9ed6bcefa2

Initial support for Revert command with accompanying minor refactoring
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 15 Jan 2013 17:07:19 +0100
parents 1ee452f31187
children 0f6fa88e2162
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1 /*
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2 * Copyright (c) 2010-2012 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
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22 import java.io.File;
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23 import java.io.IOException;
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24 import java.util.zip.Inflater;
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26 import org.tmatesoft.hg.core.Nodeid;
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27 import org.tmatesoft.hg.repo.HgInternals;
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28 import org.tmatesoft.hg.repo.HgInvalidControlFileException;
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29 import org.tmatesoft.hg.repo.HgInvalidRevisionException;
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30 import org.tmatesoft.hg.repo.HgInvalidStateException;
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31 import org.tmatesoft.hg.repo.HgRepository;
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32 import org.tmatesoft.hg.util.Adaptable;
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35 /**
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36 * ? Single RevlogStream per file per repository with accessor to record access session (e.g. with back/forward operations),
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37 * or numerous RevlogStream with separate representation of the underlying data (cached, lazy ChunkStream)?
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38 *
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39 * @see http://mercurial.selenic.com/wiki/Revlog
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40 * @see http://mercurial.selenic.com/wiki/RevlogNG
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41 *
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42 * @author Artem Tikhomirov
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43 * @author TMate Software Ltd.
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44 */
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45 public class RevlogStream {
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47 /*
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48 * 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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49 *
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50 * long[] in fact (there are 8-bytes field in the revlog)
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51 * However, (a) DataAccess currently doesn't operate with long seek/length
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52 * and, of greater significance, (b) files with inlined data are designated for smaller files,
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53 * guess, about 130 Kb, and offset there won't ever break int capacity
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54 */
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55 private int[] indexRecordOffset;
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56 private int[] baseRevisions;
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57 private boolean inline = false;
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58 private final File indexFile;
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59 private File dataFile;
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60 private final DataAccessProvider dataAccess;
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62 // if we need anything else from HgRepo, might replace DAP parameter with HgRepo and query it for DAP.
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63 public RevlogStream(DataAccessProvider dap, File indexFile) {
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64 this.dataAccess = dap;
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65 this.indexFile = indexFile;
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66 }
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68 /*package*/ DataAccess getIndexStream() {
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69 // 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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70 // to avoid mmap files when only few bytes are to be read (i.e. #dataLength())
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71 return dataAccess.create(indexFile);
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72 }
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74 /*package*/ DataAccess getDataStream() {
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75 return dataAccess.create(getDataFile());
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76 }
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78 /**
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79 * Constructs file object that corresponds to .d revlog counterpart.
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80 * Note, it's caller responsibility to ensure this file makes any sense (i.e. check {@link #inline} attribute)
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81 */
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82 private File getDataFile() {
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83 if (dataFile == null) {
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84 final String indexName = indexFile.getName();
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85 dataFile = new File(indexFile.getParentFile(), indexName.substring(0, indexName.length() - 1) + "d");
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86 }
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87 return dataFile;
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88 }
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90 // initialize exception with the file where revlog structure information comes from
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91 public HgInvalidControlFileException initWithIndexFile(HgInvalidControlFileException ex) {
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92 return ex.setFile(indexFile);
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93 }
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95 // initialize exception with the file where revlog data comes from
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96 public HgInvalidControlFileException initWithDataFile(HgInvalidControlFileException ex) {
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97 // exceptions are usually raised after read attepmt, hence inline shall be initialized
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98 // although honest approach is to call #initOutline() first
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99 return ex.setFile(inline ? indexFile : getDataFile());
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100 }
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101
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102
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103 public int revisionCount() {
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104 initOutline();
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105 return baseRevisions.length;
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106 }
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107
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108 /**
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109 * @throws HgInvalidControlFileException if attempt to read index file failed
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110 * @throws HgInvalidRevisionException if revisionIndex argument doesn't represent a valid record in the revlog
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111 */
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112 public int dataLength(int revisionIndex) throws HgInvalidControlFileException, HgInvalidRevisionException {
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113 // XXX in fact, use of iterate() instead of this implementation may be quite reasonable.
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114 //
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115 revisionIndex = checkRevisionIndex(revisionIndex);
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116 DataAccess daIndex = getIndexStream();
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117 try {
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118 int recordOffset = getIndexOffsetInt(revisionIndex);
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119 daIndex.seek(recordOffset + 12); // 6+2+4
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120 int actualLen = daIndex.readInt();
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121 return actualLen;
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122 } catch (IOException ex) {
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123 throw new HgInvalidControlFileException(null, ex, indexFile).setRevisionIndex(revisionIndex);
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124 } finally {
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125 daIndex.done();
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126 }
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127 }
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128
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129 /**
354
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130 * Read nodeid at given index
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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 byte[] nodeid(int revisionIndex) throws HgInvalidControlFileException, HgInvalidRevisionException {
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136 revisionIndex = checkRevisionIndex(revisionIndex);
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137 DataAccess daIndex = getIndexStream();
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138 try {
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139 int recordOffset = getIndexOffsetInt(revisionIndex);
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140 daIndex.seek(recordOffset + 32);
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141 byte[] rv = new byte[20];
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142 daIndex.readBytes(rv, 0, 20);
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143 return rv;
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144 } catch (IOException ex) {
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145 throw new HgInvalidControlFileException("Revision lookup failed", ex, indexFile).setRevisionIndex(revisionIndex);
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146 } finally {
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147 daIndex.done();
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148 }
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149 }
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150
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151 /**
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152 * Get link field from the index record.
354
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153 *
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154 * @throws HgInvalidControlFileException if attempt to read index file failed
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155 * @throws HgInvalidRevisionException if revisionIndex argument doesn't represent a valid record in the revlog
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156 */
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157 public int linkRevision(int revisionIndex) throws HgInvalidControlFileException, HgInvalidRevisionException {
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158 revisionIndex = checkRevisionIndex(revisionIndex);
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159 DataAccess daIndex = getIndexStream();
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160 try {
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161 int recordOffset = getIndexOffsetInt(revisionIndex);
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162 daIndex.seek(recordOffset + 20);
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163 int linkRev = daIndex.readInt();
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164 return linkRev;
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165 } catch (IOException ex) {
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166 throw new HgInvalidControlFileException("Linked revision lookup failed", ex, indexFile).setRevisionIndex(revisionIndex);
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167 } finally {
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168 daIndex.done();
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169 }
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170 }
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171
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172 // Perhaps, RevlogStream should be limited to use of plain int revisions for access,
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173 // while Nodeids should be kept on the level up, in Revlog. Guess, Revlog better keep
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174 // map of nodeids, and once this comes true, we may get rid of this method.
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175 // Unlike its counterpart, {@link Revlog#getLocalRevisionNumber()}, doesn't fail with exception if node not found,
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176 /**
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177 * @return integer in [0..revisionCount()) or {@link HgRepository#BAD_REVISION} if not found
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178 * @throws HgInvalidControlFileException if attempt to read index file failed
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179 */
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180 public int findRevisionIndex(Nodeid nodeid) throws HgInvalidControlFileException {
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181 // XXX this one may be implemented with iterate() once there's mechanism to stop iterations
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182 final int indexSize = revisionCount();
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183 DataAccess daIndex = getIndexStream();
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184 try {
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185 byte[] nodeidBuf = new byte[20];
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186 for (int i = 0; i < indexSize; i++) {
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187 daIndex.skip(8);
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188 int compressedLen = daIndex.readInt();
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189 daIndex.skip(20);
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190 daIndex.readBytes(nodeidBuf, 0, 20);
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191 if (nodeid.equalsTo(nodeidBuf)) {
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192 return i;
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193 }
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194 daIndex.skip(inline ? 12 + compressedLen : 12);
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195 }
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196 } catch (IOException ex) {
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197 throw new HgInvalidControlFileException("Revision lookup failed", ex, indexFile).setRevision(nodeid);
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198 } finally {
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199 daIndex.done();
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200 }
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201 return BAD_REVISION;
22
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202 }
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203
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204
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205 private final int REVLOGV1_RECORD_SIZE = 64;
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206
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207 // should be possible to use TIP, ALL, or -1, -2, -n notation of Hg
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208 // ? boolean needsNodeid
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209 public void iterate(int start, int end, boolean needData, Inspector inspector) throws HgInvalidRevisionException, HgInvalidControlFileException {
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210 initOutline();
198
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211 final int indexSize = revisionCount();
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212 if (indexSize == 0) {
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213 return;
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214 }
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215 if (end == TIP) {
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216 end = indexSize - 1;
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217 }
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218 if (start == TIP) {
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219 start = indexSize - 1;
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220 }
300
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221 HgInternals.checkRevlogRange(start, end, indexSize-1);
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222 // XXX may cache [start .. end] from index with a single read (pre-read)
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223
242
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224 ReaderN1 r = new ReaderN1(needData, inspector);
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225 try {
242
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226 r.start(end - start + 1);
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227 r.range(start, end);
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228 } catch (IOException ex) {
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229 throw new HgInvalidControlFileException(String.format("Failed reading [%d..%d]", start, end), ex, indexFile);
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230 } catch (HgInvalidControlFileException ex) {
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231 throw ex;
242
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232 } finally {
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233 r.finish();
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234 }
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235 }
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236
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237 /**
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238 * Effective alternative to {@link #iterate(int, int, boolean, Inspector) batch read}, when only few selected
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239 * revisions are of interest.
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240 * @param sortedRevisions revisions to walk, in ascending order.
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241 * @param needData whether inspector needs access to header only
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242 * @param inspector callback to process entries
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243 */
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244 public void iterate(int[] sortedRevisions, boolean needData, Inspector inspector) throws HgInvalidRevisionException, HgInvalidControlFileException /*REVISIT - too general exception*/ {
242
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245 final int indexSize = revisionCount();
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diff changeset
246 if (indexSize == 0 || sortedRevisions.length == 0) {
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parents: 223
diff changeset
247 return;
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
248 }
347
8da7ade36c57 Add specific IAE subclass to handle wrong (e.g. outdated after rollback) revisions
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 329
diff changeset
249 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
250 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
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 329
diff changeset
251 }
8da7ade36c57 Add specific IAE subclass to handle wrong (e.g. outdated after rollback) revisions
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 329
diff changeset
252 if (sortedRevisions[sortedRevisions.length - 1] > indexSize) {
8da7ade36c57 Add specific IAE subclass to handle wrong (e.g. outdated after rollback) revisions
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 329
diff changeset
253 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
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
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
256 ReaderN1 r = new ReaderN1(needData, inspector);
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
257 try {
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
258 r.start(sortedRevisions.length);
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
259 for (int i = 0; i < sortedRevisions.length; ) {
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
260 int x = i;
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
261 i++;
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
262 while (i < sortedRevisions.length) {
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
263 if (sortedRevisions[i] == sortedRevisions[i-1] + 1) {
ad6a046943be Improved reading of sparse revisions from a revlog
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 223
diff changeset
264 i++;
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
265 } 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
266 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
267 }
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
268 }
242
ad6a046943be Improved reading of sparse revisions from a revlog
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 223
diff changeset
269 // commitRevisions[x..i-1] are sequential
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
270 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
271 return;
51
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 49
diff changeset
272 }
2
08db726a0fb7 Shaping out low-level Hg structures
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parents: 0
diff changeset
273 }
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
274 } catch (IOException ex) {
366
189dc6dc1c3e Use exceptions to expose errors reading mercurial data
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 354
diff changeset
275 final int c = sortedRevisions.length;
189dc6dc1c3e Use exceptions to expose errors reading mercurial data
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 354
diff changeset
276 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
277 } 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
278 // 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
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 354
diff changeset
279 throw ex;
3
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
280 } finally {
242
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
281 r.finish();
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
282 }
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
283 }
198
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
284
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
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parents: 170
diff changeset
285 private int getBaseRevision(int revision) {
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
286 return baseRevisions[revision];
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
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
289 /**
354
5f9073eabf06 Propagate errors with exceptions up to a end client
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 347
diff changeset
290 * @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
291 * It's advised to use {@link #checkRevisionIndex(int)} to ensure argument is correct.
198
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
292 * @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
293 */
354
5f9073eabf06 Propagate errors with exceptions up to a end client
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 347
diff changeset
294 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
295 return inline ? indexRecordOffset[revisionIndex] : revisionIndex * REVLOGV1_RECORD_SIZE;
5f9073eabf06 Propagate errors with exceptions up to a end client
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 347
diff changeset
296 }
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 347
diff changeset
297
5f9073eabf06 Propagate errors with exceptions up to a end client
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parents: 347
diff changeset
298 private int checkRevisionIndex(int revisionIndex) throws HgInvalidRevisionException {
5f9073eabf06 Propagate errors with exceptions up to a end client
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 347
diff changeset
299 final int last = revisionCount() - 1;
5f9073eabf06 Propagate errors with exceptions up to a end client
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parents: 347
diff changeset
300 if (revisionIndex == TIP) {
5f9073eabf06 Propagate errors with exceptions up to a end client
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 347
diff changeset
301 revisionIndex = last;
5f9073eabf06 Propagate errors with exceptions up to a end client
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 347
diff changeset
302 }
5f9073eabf06 Propagate errors with exceptions up to a end client
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 347
diff changeset
303 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
304 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
305 }
5f9073eabf06 Propagate errors with exceptions up to a end client
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 347
diff changeset
306 return revisionIndex;
198
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
307 }
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
308
425
48f993aa2f41 FIXMEs: exceptions, javadoc
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 423
diff changeset
309 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
310 if (baseRevisions != null && baseRevisions.length > 0) {
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
311 return;
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
312 }
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
313 DataAccess da = getIndexStream();
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
314 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
315 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
316 // 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
317 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
318 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
319 }
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
320 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
321 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
322 final int INLINEDATA = 1 << 16;
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
323 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
324 IntVector resBases, resOffsets = null;
420
6c22bdc0bdfd Respect long offsets in revlogs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 398
diff changeset
325 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
326 if (inline) {
b11f6a08f748 Avoid boxing int values and list resizes on revlog read
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 280
diff changeset
327 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
328 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
329 }
b11f6a08f748 Avoid boxing int values and list resizes on revlog read
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 280
diff changeset
330 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
331
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
332 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
333 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
334 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
335 // 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
336 @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
337 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
338 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
339 // 12 + 8 = 20 bytes read here
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
340 // int linkRevision = di.readInt();
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
341 // int parent1Revision = di.readInt();
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
342 // int parent2Revision = di.readInt();
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
343 // 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
344 resBases.add(baseRevision);
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
345 if (inline) {
420
6c22bdc0bdfd Respect long offsets in revlogs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 398
diff changeset
346 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
347 if (o != offset) {
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
348 // 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
349 // 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
350 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
351 }
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
352 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
353 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
354 } 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
355 da.skip(3*4 + 32);
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
356 }
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 9
diff changeset
357 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
358 // 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
359 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
360 if (inline) {
288
b11f6a08f748 Avoid boxing int values and list resizes on revlog read
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 280
diff changeset
361 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
362 }
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
363 break;
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 9
diff changeset
364 } else {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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365 // start reading next record
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366 long l = da.readLong();
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367 offset = l >>> 16;
9
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368 }
2
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369 }
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370 } catch (IOException ex) {
423
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371 throw new HgInvalidControlFileException("Failed to analyze revlog index", ex, indexFile);
9
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372 } finally {
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373 da.done();
2
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374 }
3
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375 }
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376
242
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377 /**
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378 * operation with single file open/close and multiple diverse reads.
366
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379 * XXX initOutline might need similar extraction to keep N1 format knowledge
242
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380 */
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381 class ReaderN1 {
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382 private final Inspector inspector;
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383 private final boolean needData;
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384 private DataAccess daIndex = null, daData = null;
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385 private Lifecycle.BasicCallback cb = null;
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386 private Lifecycle lifecycleListener = null;
242
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387 private int lastRevisionRead = BAD_REVISION;
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388 private DataAccess lastUserData;
263
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389 // next are to track two major bottlenecks - patch application and actual time spent in inspector
264
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390 // private long applyTime, inspectorTime; // TIMING
263
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391
242
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392
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393 public ReaderN1(boolean needData, Inspector insp) {
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394 assert insp != null;
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395 this.needData = needData;
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396 inspector = insp;
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397 }
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398
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399 public void start(int totalWork) {
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400 daIndex = getIndexStream();
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401 if (needData && !inline) {
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402 daData = getDataStream();
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403 }
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404 lifecycleListener = Adaptable.Factory.getAdapter(inspector, Lifecycle.class, null);
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405 if (lifecycleListener != null) {
242
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406 cb = new Lifecycle.BasicCallback();
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407 lifecycleListener.start(totalWork, cb, cb);
242
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408 }
264
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409 // applyTime = inspectorTime = 0; // TIMING
242
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410 }
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411
520
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412 // invoked only once per instance
242
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413 public void finish() {
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414 if (lastUserData != null) {
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415 lastUserData.done();
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416 lastUserData = null;
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417 }
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418 if (lifecycleListener != null) {
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419 lifecycleListener.finish(cb);
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420 lifecycleListener = null;
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421 cb = null;
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422
242
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423 }
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424 daIndex.done();
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425 if (daData != null) {
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426 daData.done();
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427 daData = null;
242
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428 }
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429 // System.out.printf("applyTime:%d ms, inspectorTime: %d ms\n", applyTime, inspectorTime); // TIMING
242
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430 }
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431
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432 // may be invoked few times per instance life
423
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433 public boolean range(int start, int end) throws IOException {
242
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434 byte[] nodeidBuf = new byte[20];
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435 int i;
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436 // it (i.e. replace with i >= start)
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437 if (needData && (i = getBaseRevision(start)) < start) {
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438 // if lastRevisionRead in [baseRevision(start), start) can reuse lastUserData
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439 // doesn't make sense to reuse if lastRevisionRead == start (too much to change in the cycle below).
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440 if (lastRevisionRead != BAD_REVISION && i <= lastRevisionRead && lastRevisionRead < start) {
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441 i = lastRevisionRead + 1; // start with first not-yet-read revision
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442 } else {
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443 if (lastUserData != null) {
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444 lastUserData.done();
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445 lastUserData = null;
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446 }
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447 }
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448 } else {
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449 // don't need to clean lastUserData as it's always null when !needData
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450 i = start;
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451 }
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452
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453 daIndex.seek(getIndexOffsetInt(i));
258
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454 //
263
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455 // reuse some instances
329
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456 final Patch patch = new Patch();
263
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457 final Inflater inflater = new Inflater();
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458 // can share buffer between instances of InflaterDataAccess as I never read any two of them in parallel
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459 final byte[] inflaterBuffer = new byte[1024];
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460 //
242
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461
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462 for (; i <= end; i++ ) {
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463 if (inline && needData) {
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464 // inspector reading data (though FilterDataAccess) may have affected index position
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465 daIndex.seek(getIndexOffsetInt(i));
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466 }
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467 long l = daIndex.readLong(); // 0
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468 long offset = i == 0 ? 0 : (l >>> 16);
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469 @SuppressWarnings("unused")
420
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470 int flags = (int) (l & 0x0FFFF);
242
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471 int compressedLen = daIndex.readInt(); // +8
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472 int actualLen = daIndex.readInt(); // +12
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473 int baseRevision = daIndex.readInt(); // +16
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474 int linkRevision = daIndex.readInt(); // +20
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475 int parent1Revision = daIndex.readInt();
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476 int parent2Revision = daIndex.readInt();
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477 // Hg has 32 bytes here, uses 20 for nodeid, and keeps 12 last bytes empty
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478 daIndex.readBytes(nodeidBuf, 0, 20); // +32
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479 daIndex.skip(12);
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480 DataAccess userDataAccess = null;
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481 if (needData) {
420
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482 long streamOffset;
242
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483 DataAccess streamDataAccess;
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484 if (inline) {
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485 streamDataAccess = daIndex;
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486 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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487 } else {
420
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488 streamOffset = offset;
242
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489 streamDataAccess = daData;
420
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490 daData.longSeek(streamOffset);
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491 }
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492 final boolean patchToPrevious = baseRevision != i; // the only way I found to tell if it's a patch
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493 if (streamDataAccess.isEmpty() || compressedLen == 0) {
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494 userDataAccess = new DataAccess(); // empty
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495 } else {
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496 final byte firstByte = streamDataAccess.readByte();
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497 if (firstByte == 0x78 /* 'x' */) {
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498 inflater.reset();
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499 userDataAccess = new InflaterDataAccess(streamDataAccess, streamOffset, compressedLen, patchToPrevious ? -1 : actualLen, inflater, inflaterBuffer);
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500 } else if (firstByte == 0x75 /* 'u' */) {
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501 userDataAccess = new FilterDataAccess(streamDataAccess, streamOffset+1, compressedLen-1);
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502 } else {
397
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503 // 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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504 //
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505 // although firstByte is already read from the streamDataAccess, FilterDataAccess#readByte would seek to
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506 // initial offset before first attempt to read a byte
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507 userDataAccess = new FilterDataAccess(streamDataAccess, streamOffset, compressedLen);
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508 }
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509 }
397
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510 // userDataAccess is revision content, either complete revision, patch of a previous content, or an empty patch
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511 if (patchToPrevious) {
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512 // this is a patch
397
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513 if (userDataAccess.isEmpty()) {
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514 // Issue 22, empty patch to an empty base revision
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515 // Issue 24, empty patch to non-empty base revision
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516 // empty patch modifies nothing, use content of a previous revision (shall present - it's a patch here)
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517 //
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518 assert lastUserData.length() == actualLen; // with no patch, data size shall be the same
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519 userDataAccess = lastUserData;
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520 } else {
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521 patch.read(userDataAccess);
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522 userDataAccess.done();
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523 //
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524 // it shall be reset at the end of prev iteration, when it got assigned from userDataAccess
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525 // however, actual userDataAccess and lastUserData may share Inflater object, which needs to be reset
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526 // Alternatively, userDataAccess.done() above may be responsible to reset Inflater (if it's InflaterDataAccess)
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527 lastUserData.reset();
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528 // final long startMeasuring = System.currentTimeMillis(); // TIMING
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529 byte[] userData = patch.apply(lastUserData, actualLen);
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530 // applyTime += (System.currentTimeMillis() - startMeasuring); // TIMING
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531 patch.clear(); // do not keep any reference, allow byte[] data to be gc'd
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532 userDataAccess = new ByteArrayDataAccess(userData);
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533 }
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534 }
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535 } else {
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536 if (inline) {
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537 daIndex.skip(compressedLen);
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538 }
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539 }
329
694ebabb5cb3 Refactor revlog patch mechanism, towards patch merging
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540 if (i >= start) {
264
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diff changeset
541 // final long startMeasuring = System.currentTimeMillis(); // TIMING
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542 inspector.next(i, actualLen, baseRevision, linkRevision, parent1Revision, parent2Revision, nodeidBuf, userDataAccess);
264
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543 // inspectorTime += (System.currentTimeMillis() - startMeasuring); // TIMING
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544 }
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545 if (cb != null) {
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546 if (cb.isStopped()) {
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547 return false;
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548 }
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549 }
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550 if (userDataAccess != null) {
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551 userDataAccess.reset(); // not sure this is necessary here, as lastUserData would get reset anyway before next use.
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552 }
397
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553 if (lastUserData != null && lastUserData != userDataAccess /* empty patch case, reuse of recent data in actual revision */) {
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554 // release lastUserData only if we didn't reuse it in actual revision due to empty patch:
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555 // 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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diff changeset
556 lastUserData.done();
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557 }
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558 lastUserData = userDataAccess;
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559 }
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560 lastRevisionRead = end;
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561 return true;
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562 }
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563 }
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564
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565
77
c677e1593919 Moved RevlogStream implementation into .internal
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566 public interface Inspector {
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567 // XXX boolean retVal to indicate whether to continue?
157
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568 // 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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569 // implementers shall not invoke DataAccess.done(), it's accomplished by #iterate at appropraite moment
423
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570 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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571 }
0
dbd663faec1f Basic changelog parsing
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572 }