Mercurial > hg4j

annotate src/org/tmatesoft/hg/internal/RevlogStream.java @ 425:48f993aa2f41

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FIXMEs: exceptions, javadoc
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 28 Mar 2012 18:39:29 +0200
parents 9c9c442b5f2e
children 299870249a28
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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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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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34 /**
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35 * ? Single RevlogStream per file per repository with accessor to record access session (e.g. with back/forward operations),
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36 * or numerous RevlogStream with separate representation of the underlying data (cached, lazy ChunkStream)?
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37 *
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38 * @see http://mercurial.selenic.com/wiki/Revlog
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39 * @see http://mercurial.selenic.com/wiki/RevlogNG
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40 *
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41 * @author Artem Tikhomirov
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42 * @author TMate Software Ltd.
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43 */
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44 public class RevlogStream {
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46 /*
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47 * 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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48 *
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49 * long[] in fact (there are 8-bytes field in the revlog)
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50 * However, (a) DataAccess currently doesn't operate with long seek/length
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51 * and, of greater significance, (b) files with inlined data are designated for smaller files,
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52 * guess, about 130 Kb, and offset there won't ever break int capacity
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53 */
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54 private int[] indexRecordOffset;
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55 private int[] baseRevisions;
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56 private boolean inline = false;
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57 private final File indexFile;
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58 private File dataFile;
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59 private final DataAccessProvider dataAccess;
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61 // if we need anything else from HgRepo, might replace DAP parameter with HgRepo and query it for DAP.
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62 public RevlogStream(DataAccessProvider dap, File indexFile) {
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63 this.dataAccess = dap;
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64 this.indexFile = indexFile;
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65 }
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67 /*package*/ DataAccess getIndexStream() {
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68 // 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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69 // to avoid mmap files when only few bytes are to be read (i.e. #dataLength())
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70 return dataAccess.create(indexFile);
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71 }
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73 /*package*/ DataAccess getDataStream() {
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74 return dataAccess.create(getDataFile());
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75 }
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76
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77 /**
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78 * Constructs file object that corresponds to .d revlog counterpart.
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79 * Note, it's caller responsibility to ensure this file makes any sense (i.e. check {@link #inline} attribute)
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80 */
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81 private File getDataFile() {
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82 if (dataFile == null) {
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83 final String indexName = indexFile.getName();
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84 dataFile = new File(indexFile.getParentFile(), indexName.substring(0, indexName.length() - 1) + "d");
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85 }
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86 return dataFile;
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87 }
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89 // initialize exception with the file where revlog structure information comes from
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90 public HgInvalidControlFileException initWithIndexFile(HgInvalidControlFileException ex) {
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91 return ex.setFile(indexFile);
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92 }
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94 // initialize exception with the file where revlog data comes from
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95 public HgInvalidControlFileException initWithDataFile(HgInvalidControlFileException ex) {
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96 // exceptions are usually raised after read attepmt, hence inline shall be initialized
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97 // although honest approach is to call #initOutline() first
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98 return ex.setFile(inline ? indexFile : getDataFile());
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99 }
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101
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102 public int revisionCount() {
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103 initOutline();
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104 return baseRevisions.length;
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105 }
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106
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107 /**
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108 * @throws HgInvalidControlFileException if attempt to read index file failed
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109 * @throws HgInvalidRevisionException if revisionIndex argument doesn't represent a valid record in the revlog
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110 */
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111 public int dataLength(int revisionIndex) throws HgInvalidControlFileException, HgInvalidRevisionException {
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112 // XXX in fact, use of iterate() instead of this implementation may be quite reasonable.
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113 //
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114 revisionIndex = checkRevisionIndex(revisionIndex);
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115 DataAccess daIndex = getIndexStream();
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116 try {
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117 int recordOffset = getIndexOffsetInt(revisionIndex);
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118 daIndex.seek(recordOffset + 12); // 6+2+4
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119 int actualLen = daIndex.readInt();
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120 return actualLen;
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121 } catch (IOException ex) {
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122 throw new HgInvalidControlFileException(null, ex, indexFile);
22
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123 } finally {
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124 daIndex.done();
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125 }
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126 }
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127
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128 /**
354
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129 * Read nodeid at given index
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130 *
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131 * @throws HgInvalidControlFileException if attempt to read index file failed
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132 * @throws HgInvalidRevisionException if revisionIndex argument doesn't represent a valid record in the revlog
295
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133 */
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134 public byte[] nodeid(int revisionIndex) throws HgInvalidControlFileException, HgInvalidRevisionException {
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135 revisionIndex = checkRevisionIndex(revisionIndex);
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136 DataAccess daIndex = getIndexStream();
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137 try {
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138 int recordOffset = getIndexOffsetInt(revisionIndex);
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139 daIndex.seek(recordOffset + 32);
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140 byte[] rv = new byte[20];
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141 daIndex.readBytes(rv, 0, 20);
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142 return rv;
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143 } catch (IOException ex) {
354
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144 throw new HgInvalidControlFileException(null, ex, indexFile);
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145 } finally {
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146 daIndex.done();
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147 }
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148 }
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149
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150 /**
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151 * Get link field from the index record.
354
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152 *
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153 * @throws HgInvalidControlFileException if attempt to read index file failed
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154 * @throws HgInvalidRevisionException if revisionIndex argument doesn't represent a valid record in the revlog
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155 */
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156 public int linkRevision(int revisionIndex) throws HgInvalidControlFileException, HgInvalidRevisionException {
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157 revisionIndex = checkRevisionIndex(revisionIndex);
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158 DataAccess daIndex = getIndexStream();
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159 try {
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160 int recordOffset = getIndexOffsetInt(revisionIndex);
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161 daIndex.seek(recordOffset + 20);
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162 int linkRev = daIndex.readInt();
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163 return linkRev;
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164 } catch (IOException ex) {
354
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165 throw new HgInvalidControlFileException(null, ex, indexFile);
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166 } finally {
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167 daIndex.done();
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168 }
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169 }
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170
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171 // Perhaps, RevlogStream should be limited to use of plain int revisions for access,
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172 // while Nodeids should be kept on the level up, in Revlog. Guess, Revlog better keep
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173 // map of nodeids, and once this comes true, we may get rid of this method.
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174 // Unlike its counterpart, {@link Revlog#getLocalRevisionNumber()}, doesn't fail with exception if node not found,
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175 /**
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176 * @return integer in [0..revisionCount()) or {@link HgRepository#BAD_REVISION} if not found
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177 * @throws HgInvalidControlFileException if attempt to read index file failed
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178 */
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179 public int findRevisionIndex(Nodeid nodeid) throws HgInvalidControlFileException {
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180 // XXX this one may be implemented with iterate() once there's mechanism to stop iterations
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181 final int indexSize = revisionCount();
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182 DataAccess daIndex = getIndexStream();
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183 try {
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184 byte[] nodeidBuf = new byte[20];
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185 for (int i = 0; i < indexSize; i++) {
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186 daIndex.skip(8);
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187 int compressedLen = daIndex.readInt();
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188 daIndex.skip(20);
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189 daIndex.readBytes(nodeidBuf, 0, 20);
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190 if (nodeid.equalsTo(nodeidBuf)) {
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191 return i;
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192 }
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193 daIndex.skip(inline ? 12 + compressedLen : 12);
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194 }
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195 } catch (IOException ex) {
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196 throw new HgInvalidControlFileException("Failed", ex, indexFile).setRevision(nodeid);
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197 } finally {
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198 daIndex.done();
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199 }
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200 return BAD_REVISION;
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201 }
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202
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203
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204 private final int REVLOGV1_RECORD_SIZE = 64;
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205
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206 // should be possible to use TIP, ALL, or -1, -2, -n notation of Hg
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207 // ? boolean needsNodeid
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208 public void iterate(int start, int end, boolean needData, Inspector inspector) throws HgInvalidRevisionException, HgInvalidControlFileException {
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209 initOutline();
198
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210 final int indexSize = revisionCount();
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211 if (indexSize == 0) {
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212 return;
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213 }
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214 if (end == TIP) {
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215 end = indexSize - 1;
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216 }
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217 if (start == TIP) {
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218 start = indexSize - 1;
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219 }
300
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220 HgInternals.checkRevlogRange(start, end, indexSize-1);
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221 // XXX may cache [start .. end] from index with a single read (pre-read)
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222
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223 ReaderN1 r = new ReaderN1(needData, inspector);
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224 try {
242
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225 r.start(end - start + 1);
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226 r.range(start, end);
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227 } catch (IOException ex) {
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228 throw new HgInvalidControlFileException(String.format("Failed reading [%d..%d]", start, end), ex, indexFile);
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229 } catch (HgInvalidControlFileException ex) {
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230 throw ex;
242
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231 } finally {
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232 r.finish();
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233 }
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234 }
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235
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236 /**
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237 * Effective alternative to {@link #iterate(int, int, boolean, Inspector) batch read}, when only few selected
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238 * revisions are of interest.
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239 * @param sortedRevisions revisions to walk, in ascending order.
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240 * @param needData whether inspector needs access to header only
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241 * @param inspector callback to process entries
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242 */
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243 public void iterate(int[] sortedRevisions, boolean needData, Inspector inspector) throws HgInvalidRevisionException, HgInvalidControlFileException /*REVISIT - too general exception*/ {
242
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244 final int indexSize = revisionCount();
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245 if (indexSize == 0 || sortedRevisions.length == 0) {
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246 return;
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247 }
347
8da7ade36c57 Add specific IAE subclass to handle wrong (e.g. outdated after rollback) revisions
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parents: 329
diff changeset
248 if (sortedRevisions[0] > indexSize) {
8da7ade36c57 Add specific IAE subclass to handle wrong (e.g. outdated after rollback) revisions
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parents: 329
diff changeset
249 throw new HgInvalidRevisionException(String.format("Can't iterate [%d, %d] in range [0..%d]", sortedRevisions[0], sortedRevisions[sortedRevisions.length - 1], indexSize), null, sortedRevisions[0]);
8da7ade36c57 Add specific IAE subclass to handle wrong (e.g. outdated after rollback) revisions
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parents: 329
diff changeset
250 }
8da7ade36c57 Add specific IAE subclass to handle wrong (e.g. outdated after rollback) revisions
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 329
diff changeset
251 if (sortedRevisions[sortedRevisions.length - 1] > indexSize) {
8da7ade36c57 Add specific IAE subclass to handle wrong (e.g. outdated after rollback) revisions
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parents: 329
diff changeset
252 throw new HgInvalidRevisionException(String.format("Can't iterate [%d, %d] in range [0..%d]", sortedRevisions[0], sortedRevisions[sortedRevisions.length - 1], indexSize), null, sortedRevisions[sortedRevisions.length - 1]);
242
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
253 }
ad6a046943be Improved reading of sparse revisions from a revlog
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 223
diff changeset
254
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
255 ReaderN1 r = new ReaderN1(needData, inspector);
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
256 try {
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
257 r.start(sortedRevisions.length);
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parents: 223
diff changeset
258 for (int i = 0; i < sortedRevisions.length; ) {
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
259 int x = i;
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
260 i++;
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
261 while (i < sortedRevisions.length) {
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
262 if (sortedRevisions[i] == sortedRevisions[i-1] + 1) {
ad6a046943be Improved reading of sparse revisions from a revlog
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 223
diff changeset
263 i++;
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
264 } else {
217
e39cf474ef94 Experimental support to mix-in start and end events for inspectors. Additionally, Lifecycle may serve as iteration control
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 202
diff changeset
265 break;
e39cf474ef94 Experimental support to mix-in start and end events for inspectors. Additionally, Lifecycle may serve as iteration control
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 202
diff changeset
266 }
e39cf474ef94 Experimental support to mix-in start and end events for inspectors. Additionally, Lifecycle may serve as iteration control
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 202
diff changeset
267 }
242
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
268 // commitRevisions[x..i-1] are sequential
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
269 if (!r.range(sortedRevisions[x], sortedRevisions[i-1])) {
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
270 return;
51
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 49
diff changeset
271 }
2
08db726a0fb7 Shaping out low-level Hg structures
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parents: 0
diff changeset
272 }
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
273 } catch (IOException ex) {
366
189dc6dc1c3e Use exceptions to expose errors reading mercurial data
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 354
diff changeset
274 final int c = sortedRevisions.length;
189dc6dc1c3e Use exceptions to expose errors reading mercurial data
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 354
diff changeset
275 throw new HgInvalidControlFileException(String.format("Failed reading %d revisions in [%d; %d]",c, sortedRevisions[0], sortedRevisions[c-1]), ex, indexFile);
189dc6dc1c3e Use exceptions to expose errors reading mercurial data
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 354
diff changeset
276 } catch (HgInvalidControlFileException ex) {
423
9c9c442b5f2e Major refactoring of exception handling. Low-level API uses RuntimeExceptions, while checked are left for higher level
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 420
diff changeset
277 // TODO post-1.0 fill HgRuntimeException with appropriate file (either index or data, depending on error source)
366
189dc6dc1c3e Use exceptions to expose errors reading mercurial data
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 354
diff changeset
278 throw ex;
3
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
279 } finally {
242
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
280 r.finish();
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
281 }
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
282 }
198
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
283
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
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parents: 170
diff changeset
284 private int getBaseRevision(int revision) {
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
285 return baseRevisions[revision];
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
286 }
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
287
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
288 /**
354
5f9073eabf06 Propagate errors with exceptions up to a end client
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 347
diff changeset
289 * @param revisionIndex shall be valid index, [0..baseRevisions.length-1].
5f9073eabf06 Propagate errors with exceptions up to a end client
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parents: 347
diff changeset
290 * It's advised to use {@link #checkRevisionIndex(int)} to ensure argument is correct.
198
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
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parents: 170
diff changeset
291 * @return offset of the revision's record in the index (.i) stream
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
292 */
354
5f9073eabf06 Propagate errors with exceptions up to a end client
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 347
diff changeset
293 private int getIndexOffsetInt(int revisionIndex) {
5f9073eabf06 Propagate errors with exceptions up to a end client
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 347
diff changeset
294 return inline ? indexRecordOffset[revisionIndex] : revisionIndex * REVLOGV1_RECORD_SIZE;
5f9073eabf06 Propagate errors with exceptions up to a end client
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parents: 347
diff changeset
295 }
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parents: 347
diff changeset
296
5f9073eabf06 Propagate errors with exceptions up to a end client
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parents: 347
diff changeset
297 private int checkRevisionIndex(int revisionIndex) throws HgInvalidRevisionException {
5f9073eabf06 Propagate errors with exceptions up to a end client
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parents: 347
diff changeset
298 final int last = revisionCount() - 1;
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parents: 347
diff changeset
299 if (revisionIndex == TIP) {
5f9073eabf06 Propagate errors with exceptions up to a end client
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parents: 347
diff changeset
300 revisionIndex = last;
5f9073eabf06 Propagate errors with exceptions up to a end client
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 347
diff changeset
301 }
5f9073eabf06 Propagate errors with exceptions up to a end client
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 347
diff changeset
302 if (revisionIndex < 0 || revisionIndex > last) {
5f9073eabf06 Propagate errors with exceptions up to a end client
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 347
diff changeset
303 throw new HgInvalidRevisionException(revisionIndex).setRevisionIndex(revisionIndex, 0, last);
5f9073eabf06 Propagate errors with exceptions up to a end client
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 347
diff changeset
304 }
5f9073eabf06 Propagate errors with exceptions up to a end client
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 347
diff changeset
305 return revisionIndex;
198
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
306 }
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
307
425
48f993aa2f41 FIXMEs: exceptions, javadoc
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 423
diff changeset
308 private void initOutline() throws HgInvalidControlFileException {
198
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
309 if (baseRevisions != null && baseRevisions.length > 0) {
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
310 return;
08db726a0fb7 Shaping out low-level Hg structures
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parents: 0
diff changeset
311 }
9
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
312 DataAccess da = getIndexStream();
2
08db726a0fb7 Shaping out low-level Hg structures
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parents: 0
diff changeset
313 try {
202
706bcc7cfee4 Basic test for HgIncomingCommand. Fix RepositoryComparator for cases when whole repository is unknown. Respect freshly initialized (empty) repositories in general.
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 198
diff changeset
314 if (da.isEmpty()) {
706bcc7cfee4 Basic test for HgIncomingCommand. Fix RepositoryComparator for cases when whole repository is unknown. Respect freshly initialized (empty) repositories in general.
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 198
diff changeset
315 // do not fail with exception if stream is empty, it's likely intentional
706bcc7cfee4 Basic test for HgIncomingCommand. Fix RepositoryComparator for cases when whole repository is unknown. Respect freshly initialized (empty) repositories in general.
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 198
diff changeset
316 baseRevisions = new int[0];
706bcc7cfee4 Basic test for HgIncomingCommand. Fix RepositoryComparator for cases when whole repository is unknown. Respect freshly initialized (empty) repositories in general.
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 198
diff changeset
317 return;
706bcc7cfee4 Basic test for HgIncomingCommand. Fix RepositoryComparator for cases when whole repository is unknown. Respect freshly initialized (empty) repositories in general.
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 198
diff changeset
318 }
9
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
319 int versionField = da.readInt();
170
71ddbf8603e8 Initial clone: populate given directory from a bundle. Everything but remote server access is there, albeit prototype code style
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 158
diff changeset
320 da.readInt(); // just to skip next 4 bytes of offset + flags
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
321 final int INLINEDATA = 1 << 16;
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
322 inline = (versionField & INLINEDATA) != 0;
288
b11f6a08f748 Avoid boxing int values and list resizes on revlog read
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 280
diff changeset
323 IntVector resBases, resOffsets = null;
420
6c22bdc0bdfd Respect long offsets in revlogs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 398
diff changeset
324 int entryCountGuess = Internals.ltoi(da.longLength() / REVLOGV1_RECORD_SIZE);
288
b11f6a08f748 Avoid boxing int values and list resizes on revlog read
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 280
diff changeset
325 if (inline) {
b11f6a08f748 Avoid boxing int values and list resizes on revlog read
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 280
diff changeset
326 entryCountGuess >>>= 2; // pure guess, assume useful data takes 3/4 of total space
b11f6a08f748 Avoid boxing int values and list resizes on revlog read
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 280
diff changeset
327 resOffsets = new IntVector(entryCountGuess, 5000);
b11f6a08f748 Avoid boxing int values and list resizes on revlog read
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 280
diff changeset
328 }
b11f6a08f748 Avoid boxing int values and list resizes on revlog read
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 280
diff changeset
329 resBases = new IntVector(entryCountGuess, 5000);
b11f6a08f748 Avoid boxing int values and list resizes on revlog read
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 280
diff changeset
330
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
331 long offset = 0; // first offset is always 0, thus Hg uses it for other purposes
9
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
332 while(true) {
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
333 int compressedLen = da.readInt();
5
fc265ddeab26 File content and non-effective, although working, patch application
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 4
diff changeset
334 // 8+4 = 12 bytes total read here
49
26e3eeaa3962 branch and user filtering for log operation
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 44
diff changeset
335 @SuppressWarnings("unused")
9
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
336 int actualLen = da.readInt();
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
337 int baseRevision = da.readInt();
5
fc265ddeab26 File content and non-effective, although working, patch application
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 4
diff changeset
338 // 12 + 8 = 20 bytes read here
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
339 // int linkRevision = di.readInt();
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
340 // int parent1Revision = di.readInt();
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
341 // int parent2Revision = di.readInt();
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
342 // byte[] nodeid = new byte[32];
198
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
343 resBases.add(baseRevision);
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
344 if (inline) {
420
6c22bdc0bdfd Respect long offsets in revlogs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 398
diff changeset
345 int o = Internals.ltoi(offset);
198
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
346 if (o != offset) {
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
347 // just in case, can't happen, ever, unless HG (or some other bad tool) produces index file
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
348 // with inlined data of size greater than 2 Gb.
423
9c9c442b5f2e Major refactoring of exception handling. Low-level API uses RuntimeExceptions, while checked are left for higher level
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 420
diff changeset
349 throw new HgInvalidStateException("Data too big, offset didn't fit to sizeof(int)");
198
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
350 }
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
351 resOffsets.add(o + REVLOGV1_RECORD_SIZE * resOffsets.size());
9
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
352 da.skip(3*4 + 32 + compressedLen); // Check: 44 (skip) + 20 (read) = 64 (total RevlogNG record size)
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
353 } else {
9
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
354 da.skip(3*4 + 32);
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
355 }
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 9
diff changeset
356 if (da.isEmpty()) {
9
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
357 // fine, done then
288
b11f6a08f748 Avoid boxing int values and list resizes on revlog read
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 280
diff changeset
358 baseRevisions = resBases.toArray(true);
198
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
359 if (inline) {
288
b11f6a08f748 Avoid boxing int values and list resizes on revlog read
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 280
diff changeset
360 indexRecordOffset = resOffsets.toArray(true);
198
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
361 }
9
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
362 break;
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 9
diff changeset
363 } else {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 9
diff changeset
364 // start reading next record
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 9
diff changeset
365 long l = da.readLong();
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366 offset = l >>> 16;
9
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367 }
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368 }
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369 } catch (IOException ex) {
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370 throw new HgInvalidControlFileException("Failed to analyze revlog index", ex, indexFile);
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371 } finally {
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372 da.done();
2
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373 }
3
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374 }
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375
242
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376 /**
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377 * operation with single file open/close and multiple diverse reads.
366
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378 * XXX initOutline might need similar extraction to keep N1 format knowledge
242
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379 */
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380 class ReaderN1 {
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381 private final Inspector inspector;
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382 private final boolean needData;
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383 private DataAccess daIndex = null, daData = null;
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384 private Lifecycle.BasicCallback cb = null;
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385 private int lastRevisionRead = BAD_REVISION;
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386 private DataAccess lastUserData;
263
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387 // next are to track two major bottlenecks - patch application and actual time spent in inspector
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388 // private long applyTime, inspectorTime; // TIMING
263
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389
242
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390
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391 public ReaderN1(boolean needData, Inspector insp) {
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392 assert insp != null;
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393 this.needData = needData;
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394 inspector = insp;
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395 }
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396
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397 public void start(int totalWork) {
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398 daIndex = getIndexStream();
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399 if (needData && !inline) {
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400 daData = getDataStream();
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401 }
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402 if (inspector instanceof Lifecycle) {
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403 cb = new Lifecycle.BasicCallback();
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404 ((Lifecycle) inspector).start(totalWork, cb, cb);
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405 }
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406 // applyTime = inspectorTime = 0; // TIMING
242
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407 }
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408
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409 public void finish() {
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410 if (lastUserData != null) {
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411 lastUserData.done();
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412 lastUserData = null;
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413 }
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414 if (inspector instanceof Lifecycle) {
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415 ((Lifecycle) inspector).finish(cb);
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416 }
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417 daIndex.done();
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418 if (daData != null) {
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419 daData.done();
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420 }
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421 // System.out.printf("applyTime:%d ms, inspectorTime: %d ms\n", applyTime, inspectorTime); // TIMING
242
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422 }
263
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423
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424 public boolean range(int start, int end) throws IOException {
242
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425 byte[] nodeidBuf = new byte[20];
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426 int i;
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427 // it (i.e. replace with i >= start)
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428 if (needData && (i = getBaseRevision(start)) < start) {
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429 // if lastRevisionRead in [baseRevision(start), start) can reuse lastUserData
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430 // doesn't make sense to reuse if lastRevisionRead == start (too much to change in the cycle below).
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431 if (lastRevisionRead != BAD_REVISION && i <= lastRevisionRead && lastRevisionRead < start) {
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432 i = lastRevisionRead + 1; // start with first not-yet-read revision
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433 } else {
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434 if (lastUserData != null) {
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435 lastUserData.done();
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436 lastUserData = null;
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437 }
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438 }
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439 } else {
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440 // don't need to clean lastUserData as it's always null when !needData
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441 i = start;
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442 }
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443
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444 daIndex.seek(getIndexOffsetInt(i));
258
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445 //
263
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446 // reuse some instances
329
694ebabb5cb3 Refactor revlog patch mechanism, towards patch merging
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447 final Patch patch = new Patch();
263
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448 final Inflater inflater = new Inflater();
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449 // can share buffer between instances of InflaterDataAccess as I never read any two of them in parallel
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450 final byte[] inflaterBuffer = new byte[1024];
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451 //
242
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452
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453 for (; i <= end; i++ ) {
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454 if (inline && needData) {
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455 // inspector reading data (though FilterDataAccess) may have affected index position
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456 daIndex.seek(getIndexOffsetInt(i));
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457 }
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458 long l = daIndex.readLong(); // 0
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459 long offset = i == 0 ? 0 : (l >>> 16);
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460 @SuppressWarnings("unused")
420
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461 int flags = (int) (l & 0x0FFFF);
242
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462 int compressedLen = daIndex.readInt(); // +8
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463 int actualLen = daIndex.readInt(); // +12
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464 int baseRevision = daIndex.readInt(); // +16
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465 int linkRevision = daIndex.readInt(); // +20
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466 int parent1Revision = daIndex.readInt();
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467 int parent2Revision = daIndex.readInt();
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468 // Hg has 32 bytes here, uses 20 for nodeid, and keeps 12 last bytes empty
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469 daIndex.readBytes(nodeidBuf, 0, 20); // +32
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470 daIndex.skip(12);
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471 DataAccess userDataAccess = null;
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472 if (needData) {
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473 long streamOffset;
242
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474 DataAccess streamDataAccess;
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475 if (inline) {
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476 streamDataAccess = daIndex;
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477 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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478 } else {
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479 streamOffset = offset;
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480 streamDataAccess = daData;
420
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481 daData.longSeek(streamOffset);
242
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482 }
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483 final boolean patchToPrevious = baseRevision != i; // the only way I found to tell if it's a patch
397
5e95b0da26f2 Issue 24: IAE, Underflow in FilterDataAccess. Issue 26:UnsupportedOperationException when patching empty base revision. Tests
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484 if (streamDataAccess.isEmpty() || compressedLen == 0) {
242
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485 userDataAccess = new DataAccess(); // empty
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486 } else {
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487 final byte firstByte = streamDataAccess.readByte();
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488 if (firstByte == 0x78 /* 'x' */) {
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489 inflater.reset();
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490 userDataAccess = new InflaterDataAccess(streamDataAccess, streamOffset, compressedLen, patchToPrevious ? -1 : actualLen, inflater, inflaterBuffer);
242
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491 } else if (firstByte == 0x75 /* 'u' */) {
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492 userDataAccess = new FilterDataAccess(streamDataAccess, streamOffset+1, compressedLen-1);
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493 } else {
397
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494 // 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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495 //
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496 // although firstByte is already read from the streamDataAccess, FilterDataAccess#readByte would seek to
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497 // initial offset before first attempt to read a byte
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498 userDataAccess = new FilterDataAccess(streamDataAccess, streamOffset, compressedLen);
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499 }
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500 }
397
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501 // userDataAccess is revision content, either complete revision, patch of a previous content, or an empty patch
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502 if (patchToPrevious) {
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503 // this is a patch
397
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504 if (userDataAccess.isEmpty()) {
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505 // Issue 22, empty patch to an empty base revision
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506 // Issue 24, empty patch to non-empty base revision
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507 // empty patch modifies nothing, use content of a previous revision (shall present - it's a patch here)
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508 //
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509 assert lastUserData.length() == actualLen; // with no patch, data size shall be the same
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510 userDataAccess = lastUserData;
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511 } else {
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512 patch.read(userDataAccess);
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513 userDataAccess.done();
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514 //
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515 // it shall be reset at the end of prev iteration, when it got assigned from userDataAccess
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516 // however, actual userDataAccess and lastUserData may share Inflater object, which needs to be reset
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517 // Alternatively, userDataAccess.done() above may be responsible to reset Inflater (if it's InflaterDataAccess)
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518 lastUserData.reset();
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519 // final long startMeasuring = System.currentTimeMillis(); // TIMING
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520 byte[] userData = patch.apply(lastUserData, actualLen);
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521 // applyTime += (System.currentTimeMillis() - startMeasuring); // TIMING
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522 patch.clear(); // do not keep any reference, allow byte[] data to be gc'd
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523 userDataAccess = new ByteArrayDataAccess(userData);
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524 }
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525 }
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526 } else {
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527 if (inline) {
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528 daIndex.skip(compressedLen);
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529 }
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530 }
329
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531 if (i >= start) {
264
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532 // final long startMeasuring = System.currentTimeMillis(); // TIMING
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533 inspector.next(i, actualLen, baseRevision, linkRevision, parent1Revision, parent2Revision, nodeidBuf, userDataAccess);
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534 // inspectorTime += (System.currentTimeMillis() - startMeasuring); // TIMING
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535 }
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536 if (cb != null) {
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537 if (cb.isStopped()) {
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538 return false;
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539 }
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540 }
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541 if (userDataAccess != null) {
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542 userDataAccess.reset(); // not sure this is necessary here, as lastUserData would get reset anyway before next use.
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543 }
397
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544 if (lastUserData != null && lastUserData != userDataAccess /* empty patch case, reuse of recent data in actual revision */) {
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545 // release lastUserData only if we didn't reuse it in actual revision due to empty patch:
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546 // 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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547 lastUserData.done();
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548 }
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549 lastUserData = userDataAccess;
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550 }
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551 lastRevisionRead = end;
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552 return true;
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553 }
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554 }
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555
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556
77
c677e1593919 Moved RevlogStream implementation into .internal
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557 public interface Inspector {
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558 // XXX boolean retVal to indicate whether to continue?
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559 // 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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560 // implementers shall not invoke DataAccess.done(), it's accomplished by #iterate at appropraite moment
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561 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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562 }
0
dbd663faec1f Basic changelog parsing
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563 }