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annotate src/org/tmatesoft/hg/internal/RevlogStream.java @ 413:7f27122011c3

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author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 21 Mar 2012 20:40:28 +0100
parents c76c57f6b961
children 6c22bdc0bdfd
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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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25
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26 import org.tmatesoft.hg.core.HgBadStateException;
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27 import org.tmatesoft.hg.core.HgException;
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28 import org.tmatesoft.hg.core.HgInvalidControlFileException;
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29 import org.tmatesoft.hg.core.HgInvalidRevisionException;
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30 import org.tmatesoft.hg.core.Nodeid;
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31 import org.tmatesoft.hg.repo.HgInternals;
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32 import org.tmatesoft.hg.repo.HgRepository;
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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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46
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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 // XXX 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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89
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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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94
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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);
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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 /**
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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) {
354
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145 throw new HgInvalidControlFileException(null, ex, indexFile);
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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(null, ex, indexFile);
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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("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;
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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 /*REVISIT - too general exception*/ {
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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
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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;
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232 } catch (HgException ex) {
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233 throw new HgInvalidControlFileException(String.format("Failed reading [%d..%d]", start, end), ex, indexFile);
242
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234 } finally {
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235 r.finish();
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236 }
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237 }
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238
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239 /**
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240 * Effective alternative to {@link #iterate(int, int, boolean, Inspector) batch read}, when only few selected
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241 * revisions are of interest.
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242 * @param sortedRevisions revisions to walk, in ascending order.
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243 * @param needData whether inspector needs access to header only
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244 * @param inspector callback to process entries
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245 */
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246 public void iterate(int[] sortedRevisions, boolean needData, Inspector inspector) throws HgInvalidRevisionException, HgInvalidControlFileException /*REVISIT - too general exception*/ {
242
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diff changeset
247 final int indexSize = revisionCount();
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diff changeset
248 if (indexSize == 0 || sortedRevisions.length == 0) {
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diff changeset
249 return;
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parents: 223
diff changeset
250 }
347
8da7ade36c57 Add specific IAE subclass to handle wrong (e.g. outdated after rollback) revisions
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parents: 329
diff changeset
251 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
252 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
253 }
8da7ade36c57 Add specific IAE subclass to handle wrong (e.g. outdated after rollback) revisions
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 329
diff changeset
254 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
255 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
256 }
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parents: 223
diff changeset
257
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diff changeset
258 ReaderN1 r = new ReaderN1(needData, inspector);
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diff changeset
259 try {
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diff changeset
260 r.start(sortedRevisions.length);
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parents: 223
diff changeset
261 for (int i = 0; i < sortedRevisions.length; ) {
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diff changeset
262 int x = i;
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parents: 223
diff changeset
263 i++;
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diff changeset
264 while (i < sortedRevisions.length) {
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parents: 223
diff changeset
265 if (sortedRevisions[i] == sortedRevisions[i-1] + 1) {
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diff changeset
266 i++;
2
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parents: 0
diff changeset
267 } 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
268 break;
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parents: 202
diff changeset
269 }
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
270 }
242
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diff changeset
271 // commitRevisions[x..i-1] are sequential
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diff changeset
272 if (!r.range(sortedRevisions[x], sortedRevisions[i-1])) {
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parents: 223
diff changeset
273 return;
51
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 49
diff changeset
274 }
2
08db726a0fb7 Shaping out low-level Hg structures
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parents: 0
diff changeset
275 }
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diff changeset
276 } catch (IOException ex) {
366
189dc6dc1c3e Use exceptions to expose errors reading mercurial data
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parents: 354
diff changeset
277 final int c = sortedRevisions.length;
189dc6dc1c3e Use exceptions to expose errors reading mercurial data
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parents: 354
diff changeset
278 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
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parents: 354
diff changeset
279 } catch (HgInvalidControlFileException ex) {
189dc6dc1c3e Use exceptions to expose errors reading mercurial data
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diff changeset
280 throw ex;
189dc6dc1c3e Use exceptions to expose errors reading mercurial data
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parents: 354
diff changeset
281 } catch (HgException ex) {
189dc6dc1c3e Use exceptions to expose errors reading mercurial data
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diff changeset
282 final int c = sortedRevisions.length;
189dc6dc1c3e Use exceptions to expose errors reading mercurial data
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parents: 354
diff changeset
283 throw new HgInvalidControlFileException(String.format("Failed reading %d revisions in [%d; %d]",c, sortedRevisions[0], sortedRevisions[c-1]), ex, indexFile);
3
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
284 } finally {
242
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parents: 223
diff changeset
285 r.finish();
2
08db726a0fb7 Shaping out low-level Hg structures
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parents: 0
diff changeset
286 }
08db726a0fb7 Shaping out low-level Hg structures
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parents: 0
diff changeset
287 }
198
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
288
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diff changeset
289 private int getBaseRevision(int revision) {
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
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parents: 170
diff changeset
290 return baseRevisions[revision];
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parents: 170
diff changeset
291 }
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parents: 170
diff changeset
292
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diff changeset
293 /**
354
5f9073eabf06 Propagate errors with exceptions up to a end client
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parents: 347
diff changeset
294 * @param revisionIndex shall be valid index, [0..baseRevisions.length-1].
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parents: 347
diff changeset
295 * 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
296 * @return offset of the revision's record in the index (.i) stream
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
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diff changeset
297 */
354
5f9073eabf06 Propagate errors with exceptions up to a end client
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diff changeset
298 private int getIndexOffsetInt(int revisionIndex) {
5f9073eabf06 Propagate errors with exceptions up to a end client
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parents: 347
diff changeset
299 return inline ? indexRecordOffset[revisionIndex] : revisionIndex * REVLOGV1_RECORD_SIZE;
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diff changeset
300 }
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parents: 347
diff changeset
301
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diff changeset
302 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
303 final int last = revisionCount() - 1;
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parents: 347
diff changeset
304 if (revisionIndex == TIP) {
5f9073eabf06 Propagate errors with exceptions up to a end client
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parents: 347
diff changeset
305 revisionIndex = last;
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parents: 347
diff changeset
306 }
5f9073eabf06 Propagate errors with exceptions up to a end client
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 347
diff changeset
307 if (revisionIndex < 0 || revisionIndex > last) {
5f9073eabf06 Propagate errors with exceptions up to a end client
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parents: 347
diff changeset
308 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
309 }
5f9073eabf06 Propagate errors with exceptions up to a end client
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parents: 347
diff changeset
310 return revisionIndex;
198
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
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parents: 170
diff changeset
311 }
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
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parents: 170
diff changeset
312
2
08db726a0fb7 Shaping out low-level Hg structures
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parents: 0
diff changeset
313 private void initOutline() {
198
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
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parents: 170
diff changeset
314 if (baseRevisions != null && baseRevisions.length > 0) {
2
08db726a0fb7 Shaping out low-level Hg structures
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parents: 0
diff changeset
315 return;
08db726a0fb7 Shaping out low-level Hg structures
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parents: 0
diff changeset
316 }
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
317 DataAccess da = getIndexStream();
2
08db726a0fb7 Shaping out low-level Hg structures
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parents: 0
diff changeset
318 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
319 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
320 // 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
321 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
322 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
323 }
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
324 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
325 da.readInt(); // just to skip next 4 bytes of offset + flags
2
08db726a0fb7 Shaping out low-level Hg structures
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parents: 0
diff changeset
326 final int INLINEDATA = 1 << 16;
08db726a0fb7 Shaping out low-level Hg structures
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parents: 0
diff changeset
327 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
328 IntVector resBases, resOffsets = null;
b11f6a08f748 Avoid boxing int values and list resizes on revlog read
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 280
diff changeset
329 int entryCountGuess = da.length() / REVLOGV1_RECORD_SIZE;
b11f6a08f748 Avoid boxing int values and list resizes on revlog read
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 280
diff changeset
330 if (inline) {
b11f6a08f748 Avoid boxing int values and list resizes on revlog read
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 280
diff changeset
331 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
332 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
333 }
b11f6a08f748 Avoid boxing int values and list resizes on revlog read
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 280
diff changeset
334 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
335
2
08db726a0fb7 Shaping out low-level Hg structures
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parents: 0
diff changeset
336 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
337 while(true) {
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
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parents: 6
diff changeset
338 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
339 // 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
340 @SuppressWarnings("unused")
9
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
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parents: 6
diff changeset
341 int actualLen = da.readInt();
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
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parents: 6
diff changeset
342 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
343 // 12 + 8 = 20 bytes read here
2
08db726a0fb7 Shaping out low-level Hg structures
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parents: 0
diff changeset
344 // int linkRevision = di.readInt();
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parents: 0
diff changeset
345 // int parent1Revision = di.readInt();
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parents: 0
diff changeset
346 // int parent2Revision = di.readInt();
08db726a0fb7 Shaping out low-level Hg structures
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parents: 0
diff changeset
347 // byte[] nodeid = new byte[32];
198
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
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parents: 170
diff changeset
348 resBases.add(baseRevision);
2
08db726a0fb7 Shaping out low-level Hg structures
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parents: 0
diff changeset
349 if (inline) {
198
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
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parents: 170
diff changeset
350 int o = (int) offset;
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
351 if (o != offset) {
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
352 // 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
353 // with inlined data of size greater than 2 Gb.
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
354 throw new HgBadStateException("Data too big, offset didn't fit to sizeof(int)");
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
355 }
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
356 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
357 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
358 } else {
9
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
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parents: 6
diff changeset
359 da.skip(3*4 + 32);
2
08db726a0fb7 Shaping out low-level Hg structures
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parents: 0
diff changeset
360 }
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 9
diff changeset
361 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
362 // 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
363 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
364 if (inline) {
288
b11f6a08f748 Avoid boxing int values and list resizes on revlog read
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 280
diff changeset
365 indexRecordOffset = resOffsets.toArray(true);
198
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
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366 }
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367 break;
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368 } else {
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369 // start reading next record
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370 long l = da.readLong();
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371 offset = l >>> 16;
9
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372 }
2
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373 }
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374 } catch (IOException ex) {
366
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375 ex.printStackTrace(); // FIXME, log error is not enough
198
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376 // too bad, no outline then, but don't fail with NPE
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377 baseRevisions = new int[0];
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378 } finally {
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379 da.done();
2
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380 }
3
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381 }
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382
242
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383 /**
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384 * operation with single file open/close and multiple diverse reads.
366
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385 * XXX initOutline might need similar extraction to keep N1 format knowledge
242
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386 */
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387 class ReaderN1 {
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388 private final Inspector inspector;
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389 private final boolean needData;
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390 private DataAccess daIndex = null, daData = null;
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391 private Lifecycle.BasicCallback cb = null;
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392 private int lastRevisionRead = BAD_REVISION;
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393 private DataAccess lastUserData;
263
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394 // next are to track two major bottlenecks - patch application and actual time spent in inspector
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395 // private long applyTime, inspectorTime; // TIMING
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396
242
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397
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398 public ReaderN1(boolean needData, Inspector insp) {
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399 assert insp != null;
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400 this.needData = needData;
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401 inspector = insp;
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402 }
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403
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404 public void start(int totalWork) {
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405 daIndex = getIndexStream();
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406 if (needData && !inline) {
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407 daData = getDataStream();
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408 }
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409 if (inspector instanceof Lifecycle) {
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410 cb = new Lifecycle.BasicCallback();
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411 ((Lifecycle) inspector).start(totalWork, cb, cb);
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412 }
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413 // applyTime = inspectorTime = 0; // TIMING
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414 }
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415
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416 public void finish() {
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417 if (lastUserData != null) {
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418 lastUserData.done();
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419 lastUserData = null;
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420 }
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421 if (inspector instanceof Lifecycle) {
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422 ((Lifecycle) inspector).finish(cb);
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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 }
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428 // System.out.printf("applyTime:%d ms, inspectorTime: %d ms\n", applyTime, inspectorTime); // TIMING
242
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429 }
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430
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431 public boolean range(int start, int end) throws IOException, HgException {
242
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432 byte[] nodeidBuf = new byte[20];
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433 int i;
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434 // it (i.e. replace with i >= start)
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435 if (needData && (i = getBaseRevision(start)) < start) {
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436 // if lastRevisionRead in [baseRevision(start), start) can reuse lastUserData
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437 // doesn't make sense to reuse if lastRevisionRead == start (too much to change in the cycle below).
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438 if (lastRevisionRead != BAD_REVISION && i <= lastRevisionRead && lastRevisionRead < start) {
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439 i = lastRevisionRead + 1; // start with first not-yet-read revision
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440 } else {
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441 if (lastUserData != null) {
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442 lastUserData.done();
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443 lastUserData = null;
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444 }
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445 }
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446 } else {
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447 // don't need to clean lastUserData as it's always null when !needData
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448 i = start;
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449 }
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450
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451 daIndex.seek(getIndexOffsetInt(i));
258
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452 //
263
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453 // reuse some instances
329
694ebabb5cb3 Refactor revlog patch mechanism, towards patch merging
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454 final Patch patch = new Patch();
263
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455 final Inflater inflater = new Inflater();
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456 // can share buffer between instances of InflaterDataAccess as I never read any two of them in parallel
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457 final byte[] inflaterBuffer = new byte[1024];
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458 //
242
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459
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460 for (; i <= end; i++ ) {
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461 if (inline && needData) {
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462 // inspector reading data (though FilterDataAccess) may have affected index position
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463 daIndex.seek(getIndexOffsetInt(i));
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464 }
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465 long l = daIndex.readLong(); // 0
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466 long offset = i == 0 ? 0 : (l >>> 16);
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467 @SuppressWarnings("unused")
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468 int flags = (int) (l & 0X0FFFF);
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469 int compressedLen = daIndex.readInt(); // +8
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470 int actualLen = daIndex.readInt(); // +12
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471 int baseRevision = daIndex.readInt(); // +16
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472 int linkRevision = daIndex.readInt(); // +20
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473 int parent1Revision = daIndex.readInt();
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474 int parent2Revision = daIndex.readInt();
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475 // Hg has 32 bytes here, uses 20 for nodeid, and keeps 12 last bytes empty
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476 daIndex.readBytes(nodeidBuf, 0, 20); // +32
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477 daIndex.skip(12);
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478 DataAccess userDataAccess = null;
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479 if (needData) {
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480 int streamOffset;
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481 DataAccess streamDataAccess;
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482 if (inline) {
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483 streamDataAccess = daIndex;
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484 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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485 } else {
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486 streamOffset = (int) offset;
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487 streamDataAccess = daData;
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488 daData.seek(streamOffset);
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489 }
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490 final boolean patchToPrevious = baseRevision != i; // the only way I found to tell if it's a patch
397
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491 if (streamDataAccess.isEmpty() || compressedLen == 0) {
242
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492 userDataAccess = new DataAccess(); // empty
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493 } else {
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494 final byte firstByte = streamDataAccess.readByte();
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495 if (firstByte == 0x78 /* 'x' */) {
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496 inflater.reset();
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497 userDataAccess = new InflaterDataAccess(streamDataAccess, streamOffset, compressedLen, patchToPrevious ? -1 : actualLen, inflater, inflaterBuffer);
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498 } else if (firstByte == 0x75 /* 'u' */) {
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499 userDataAccess = new FilterDataAccess(streamDataAccess, streamOffset+1, compressedLen-1);
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500 } else {
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501 // 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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502 //
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503 // although firstByte is already read from the streamDataAccess, FilterDataAccess#readByte would seek to
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504 // initial offset before first attempt to read a byte
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505 userDataAccess = new FilterDataAccess(streamDataAccess, streamOffset, compressedLen);
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506 }
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507 }
397
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508 // userDataAccess is revision content, either complete revision, patch of a previous content, or an empty patch
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509 if (patchToPrevious) {
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510 // this is a patch
397
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511 if (userDataAccess.isEmpty()) {
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512 // Issue 22, empty patch to an empty base revision
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513 // Issue 24, empty patch to non-empty base revision
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514 // empty patch modifies nothing, use content of a previous revision (shall present - it's a patch here)
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515 //
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516 assert lastUserData.length() == actualLen; // with no patch, data size shall be the same
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517 userDataAccess = lastUserData;
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518 } else {
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519 patch.read(userDataAccess);
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520 userDataAccess.done();
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521 //
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522 // it shall be reset at the end of prev iteration, when it got assigned from userDataAccess
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523 // however, actual userDataAccess and lastUserData may share Inflater object, which needs to be reset
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524 // Alternatively, userDataAccess.done() above may be responsible to reset Inflater (if it's InflaterDataAccess)
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525 lastUserData.reset();
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526 // final long startMeasuring = System.currentTimeMillis(); // TIMING
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527 byte[] userData = patch.apply(lastUserData, actualLen);
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528 // applyTime += (System.currentTimeMillis() - startMeasuring); // TIMING
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529 patch.clear(); // do not keep any reference, allow byte[] data to be gc'd
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530 userDataAccess = new ByteArrayDataAccess(userData);
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531 }
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532 }
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533 } else {
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534 if (inline) {
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535 daIndex.skip(compressedLen);
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536 }
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537 }
329
694ebabb5cb3 Refactor revlog patch mechanism, towards patch merging
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538 if (i >= start) {
264
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539 // final long startMeasuring = System.currentTimeMillis(); // TIMING
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540 inspector.next(i, actualLen, baseRevision, linkRevision, parent1Revision, parent2Revision, nodeidBuf, userDataAccess);
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541 // inspectorTime += (System.currentTimeMillis() - startMeasuring); // TIMING
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542 }
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543 if (cb != null) {
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544 if (cb.isStopped()) {
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545 return false;
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546 }
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547 }
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548 if (userDataAccess != null) {
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549 userDataAccess.reset(); // not sure this is necessary here, as lastUserData would get reset anyway before next use.
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550 }
397
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551 if (lastUserData != null && lastUserData != userDataAccess /* empty patch case, reuse of recent data in actual revision */) {
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552 // release lastUserData only if we didn't reuse it in actual revision due to empty patch:
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553 // 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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554 lastUserData.done();
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555 }
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556 lastUserData = userDataAccess;
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557 }
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558 lastRevisionRead = end;
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559 return true;
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560 }
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561 }
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562
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563
77
c677e1593919 Moved RevlogStream implementation into .internal
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564 public interface Inspector {
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565 // XXX boolean retVal to indicate whether to continue?
157
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566 // 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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diff changeset
567 // implementers shall not invoke DataAccess.done(), it's accomplished by #iterate at appropraite moment
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568 void next(int revisionIndex, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[/*20*/] nodeid, DataAccess data) throws HgException;
3
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
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569 }
0
dbd663faec1f Basic changelog parsing
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570 }