annotate src/org/tmatesoft/hg/internal/RevlogStream.java @ 367:2fadf8695f8a

Use 'revision index' instead of the vague 'local revision number' concept in the API
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 16 Dec 2011 15:37:27 +0100
parents 189dc6dc1c3e
children 729ba8f7d14e
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1 /*
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2 * Copyright (c) 2010-2011 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.internal;
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18
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19 import static org.tmatesoft.hg.repo.HgRepository.BAD_REVISION;
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20 import static org.tmatesoft.hg.repo.HgRepository.TIP;
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21
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22 import java.io.File;
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23 import java.io.IOException;
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24 import java.util.zip.Inflater;
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26 import org.tmatesoft.hg.core.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 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 // XXX 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 final String indexName = indexFile.getName();
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75 File dataFile = new File(indexFile.getParentFile(), indexName.substring(0, indexName.length() - 1) + "d");
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76 return dataAccess.create(dataFile);
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77 }
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79 public int revisionCount() {
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80 initOutline();
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81 return baseRevisions.length;
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82 }
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83
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84 /**
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85 * @throws HgInvalidControlFileException if attempt to read index file failed
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86 * @throws HgInvalidRevisionException if revisionIndex argument doesn't represent a valid record in the revlog
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87 */
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88 public int dataLength(int revisionIndex) throws HgInvalidControlFileException, HgInvalidRevisionException {
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89 // XXX in fact, use of iterate() instead of this implementation may be quite reasonable.
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90 //
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91 revisionIndex = checkRevisionIndex(revisionIndex);
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92 DataAccess daIndex = getIndexStream();
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93 try {
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94 int recordOffset = getIndexOffsetInt(revisionIndex);
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95 daIndex.seek(recordOffset + 12); // 6+2+4
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96 int actualLen = daIndex.readInt();
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97 return actualLen;
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98 } catch (IOException ex) {
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99 throw new HgInvalidControlFileException(null, ex, indexFile);
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100 } finally {
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101 daIndex.done();
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102 }
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103 }
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104
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105 /**
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106 * Read nodeid at given index
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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 byte[] nodeid(int revisionIndex) throws HgInvalidControlFileException, HgInvalidRevisionException {
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112 revisionIndex = checkRevisionIndex(revisionIndex);
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113 DataAccess daIndex = getIndexStream();
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114 try {
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115 int recordOffset = getIndexOffsetInt(revisionIndex);
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116 daIndex.seek(recordOffset + 32);
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117 byte[] rv = new byte[20];
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118 daIndex.readBytes(rv, 0, 20);
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119 return rv;
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120 } catch (IOException ex) {
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121 throw new HgInvalidControlFileException(null, ex, indexFile);
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122 } finally {
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123 daIndex.done();
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124 }
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125 }
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126
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127 /**
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128 * Get link field from the index record.
354
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129 *
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130 * @throws HgInvalidControlFileException if attempt to read index file failed
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131 * @throws HgInvalidRevisionException if revisionIndex argument doesn't represent a valid record in the revlog
295
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132 */
354
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133 public int linkRevision(int revisionIndex) throws HgInvalidControlFileException, HgInvalidRevisionException {
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134 revisionIndex = checkRevisionIndex(revisionIndex);
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135 DataAccess daIndex = getIndexStream();
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136 try {
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137 int recordOffset = getIndexOffsetInt(revisionIndex);
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138 daIndex.seek(recordOffset + 20);
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139 int linkRev = daIndex.readInt();
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140 return linkRev;
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141 } catch (IOException ex) {
354
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142 throw new HgInvalidControlFileException(null, ex, indexFile);
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143 } finally {
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144 daIndex.done();
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145 }
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146 }
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147
49
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148 // Perhaps, RevlogStream should be limited to use of plain int revisions for access,
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149 // while Nodeids should be kept on the level up, in Revlog. Guess, Revlog better keep
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150 // map of nodeids, and once this comes true, we may get rid of this method.
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151 // Unlike its counterpart, {@link Revlog#getLocalRevisionNumber()}, doesn't fail with exception if node not found,
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152 /**
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153 * @return integer in [0..revisionCount()) or {@link HgRepository#BAD_REVISION} if not found
354
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154 * @throws HgInvalidControlFileException if attempt to read index file failed
80
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155 */
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156 public int findRevisionIndex(Nodeid nodeid) throws HgInvalidControlFileException {
22
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157 // XXX this one may be implemented with iterate() once there's mechanism to stop iterations
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158 final int indexSize = revisionCount();
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159 DataAccess daIndex = getIndexStream();
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160 try {
24
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161 byte[] nodeidBuf = new byte[20];
22
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162 for (int i = 0; i < indexSize; i++) {
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163 daIndex.skip(8);
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164 int compressedLen = daIndex.readInt();
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165 daIndex.skip(20);
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166 daIndex.readBytes(nodeidBuf, 0, 20);
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167 if (nodeid.equalsTo(nodeidBuf)) {
22
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168 return i;
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169 }
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170 daIndex.skip(inline ? 12 + compressedLen : 12);
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171 }
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172 } catch (IOException ex) {
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173 throw new HgInvalidControlFileException("Failed", ex, indexFile).setRevision(nodeid);
22
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174 } finally {
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175 daIndex.done();
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176 }
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177 return BAD_REVISION;
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178 }
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179
2
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180
9
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181 private final int REVLOGV1_RECORD_SIZE = 64;
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182
3
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183 // should be possible to use TIP, ALL, or -1, -2, -n notation of Hg
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184 // ? boolean needsNodeid
366
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185 public void iterate(int start, int end, boolean needData, Inspector inspector) throws HgInvalidRevisionException, HgInvalidControlFileException /*REVISIT - too general exception*/ {
2
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186 initOutline();
198
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
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187 final int indexSize = revisionCount();
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188 if (indexSize == 0) {
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189 return;
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190 }
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191 if (end == TIP) {
3
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192 end = indexSize - 1;
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193 }
5
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194 if (start == TIP) {
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195 start = indexSize - 1;
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196 }
300
650b45d290b1 Share range check code
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diff changeset
197 HgInternals.checkRevlogRange(start, end, indexSize-1);
2
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198 // XXX may cache [start .. end] from index with a single read (pre-read)
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199
242
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200 ReaderN1 r = new ReaderN1(needData, inspector);
2
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201 try {
242
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202 r.start(end - start + 1);
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203 r.range(start, end);
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diff changeset
204 } catch (IOException ex) {
366
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205 throw new HgInvalidControlFileException(String.format("Failed reading [%d..%d]", start, end), ex, indexFile);
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diff changeset
206 } catch (HgInvalidControlFileException ex) {
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diff changeset
207 throw ex;
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208 } catch (HgException ex) {
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diff changeset
209 throw new HgInvalidControlFileException(String.format("Failed reading [%d..%d]", start, end), ex, indexFile);
242
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diff changeset
210 } finally {
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diff changeset
211 r.finish();
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diff changeset
212 }
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diff changeset
213 }
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214
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diff changeset
215 /**
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216 * Effective alternative to {@link #iterate(int, int, boolean, Inspector) batch read}, when only few selected
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diff changeset
217 * revisions are of interest.
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218 * @param sortedRevisions revisions to walk, in ascending order.
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219 * @param needData whether inspector needs access to header only
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220 * @param inspector callback to process entries
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diff changeset
221 */
366
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diff changeset
222 public void iterate(int[] sortedRevisions, boolean needData, Inspector inspector) throws HgInvalidRevisionException, HgInvalidControlFileException /*REVISIT - too general exception*/ {
242
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diff changeset
223 final int indexSize = revisionCount();
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diff changeset
224 if (indexSize == 0 || sortedRevisions.length == 0) {
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diff changeset
225 return;
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diff changeset
226 }
347
8da7ade36c57 Add specific IAE subclass to handle wrong (e.g. outdated after rollback) revisions
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diff changeset
227 if (sortedRevisions[0] > indexSize) {
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diff changeset
228 throw new HgInvalidRevisionException(String.format("Can't iterate [%d, %d] in range [0..%d]", sortedRevisions[0], sortedRevisions[sortedRevisions.length - 1], indexSize), null, sortedRevisions[0]);
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diff changeset
229 }
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diff changeset
230 if (sortedRevisions[sortedRevisions.length - 1] > indexSize) {
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diff changeset
231 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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diff changeset
232 }
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diff changeset
233
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diff changeset
234 ReaderN1 r = new ReaderN1(needData, inspector);
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diff changeset
235 try {
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diff changeset
236 r.start(sortedRevisions.length);
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diff changeset
237 for (int i = 0; i < sortedRevisions.length; ) {
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diff changeset
238 int x = i;
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diff changeset
239 i++;
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diff changeset
240 while (i < sortedRevisions.length) {
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diff changeset
241 if (sortedRevisions[i] == sortedRevisions[i-1] + 1) {
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diff changeset
242 i++;
2
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diff changeset
243 } else {
217
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diff changeset
244 break;
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diff changeset
245 }
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diff changeset
246 }
242
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247 // commitRevisions[x..i-1] are sequential
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248 if (!r.range(sortedRevisions[x], sortedRevisions[i-1])) {
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diff changeset
249 return;
51
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
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diff changeset
250 }
2
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251 }
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252 } catch (IOException ex) {
366
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253 final int c = sortedRevisions.length;
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254 throw new HgInvalidControlFileException(String.format("Failed reading %d revisions in [%d; %d]",c, sortedRevisions[0], sortedRevisions[c-1]), ex, indexFile);
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diff changeset
255 } catch (HgInvalidControlFileException ex) {
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256 throw ex;
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257 } catch (HgException ex) {
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258 final int c = sortedRevisions.length;
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259 throw new HgInvalidControlFileException(String.format("Failed reading %d revisions in [%d; %d]",c, sortedRevisions[0], sortedRevisions[c-1]), ex, indexFile);
3
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260 } finally {
242
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diff changeset
261 r.finish();
2
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262 }
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263 }
198
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264
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265 private int getBaseRevision(int revision) {
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266 return baseRevisions[revision];
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267 }
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268
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269 /**
354
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270 * @param revisionIndex shall be valid index, [0..baseRevisions.length-1].
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271 * It's advised to use {@link #checkRevisionIndex(int)} to ensure argument is correct.
198
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272 * @return offset of the revision's record in the index (.i) stream
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273 */
354
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274 private int getIndexOffsetInt(int revisionIndex) {
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275 return inline ? indexRecordOffset[revisionIndex] : revisionIndex * REVLOGV1_RECORD_SIZE;
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276 }
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277
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278 private int checkRevisionIndex(int revisionIndex) throws HgInvalidRevisionException {
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279 final int last = revisionCount() - 1;
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280 if (revisionIndex == TIP) {
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281 revisionIndex = last;
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282 }
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283 if (revisionIndex < 0 || revisionIndex > last) {
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284 throw new HgInvalidRevisionException(revisionIndex).setRevisionIndex(revisionIndex, 0, last);
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285 }
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286 return revisionIndex;
198
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287 }
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288
2
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289 private void initOutline() {
198
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290 if (baseRevisions != null && baseRevisions.length > 0) {
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diff changeset
291 return;
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292 }
9
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diff changeset
293 DataAccess da = getIndexStream();
2
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diff changeset
294 try {
202
706bcc7cfee4 Basic test for HgIncomingCommand. Fix RepositoryComparator for cases when whole repository is unknown. Respect freshly initialized (empty) repositories in general.
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diff changeset
295 if (da.isEmpty()) {
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diff changeset
296 // do not fail with exception if stream is empty, it's likely intentional
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diff changeset
297 baseRevisions = new int[0];
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diff changeset
298 return;
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299 }
9
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diff changeset
300 int versionField = da.readInt();
170
71ddbf8603e8 Initial clone: populate given directory from a bundle. Everything but remote server access is there, albeit prototype code style
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diff changeset
301 da.readInt(); // just to skip next 4 bytes of offset + flags
2
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302 final int INLINEDATA = 1 << 16;
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diff changeset
303 inline = (versionField & INLINEDATA) != 0;
288
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diff changeset
304 IntVector resBases, resOffsets = null;
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diff changeset
305 int entryCountGuess = da.length() / REVLOGV1_RECORD_SIZE;
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diff changeset
306 if (inline) {
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diff changeset
307 entryCountGuess >>>= 2; // pure guess, assume useful data takes 3/4 of total space
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diff changeset
308 resOffsets = new IntVector(entryCountGuess, 5000);
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diff changeset
309 }
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diff changeset
310 resBases = new IntVector(entryCountGuess, 5000);
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diff changeset
311
2
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diff changeset
312 long offset = 0; // first offset is always 0, thus Hg uses it for other purposes
9
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diff changeset
313 while(true) {
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diff changeset
314 int compressedLen = da.readInt();
5
fc265ddeab26 File content and non-effective, although working, patch application
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diff changeset
315 // 8+4 = 12 bytes total read here
49
26e3eeaa3962 branch and user filtering for log operation
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diff changeset
316 @SuppressWarnings("unused")
9
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diff changeset
317 int actualLen = da.readInt();
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diff changeset
318 int baseRevision = da.readInt();
5
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diff changeset
319 // 12 + 8 = 20 bytes read here
2
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diff changeset
320 // int linkRevision = di.readInt();
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diff changeset
321 // int parent1Revision = di.readInt();
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diff changeset
322 // int parent2Revision = di.readInt();
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diff changeset
323 // byte[] nodeid = new byte[32];
198
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diff changeset
324 resBases.add(baseRevision);
2
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diff changeset
325 if (inline) {
198
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diff changeset
326 int o = (int) offset;
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diff changeset
327 if (o != offset) {
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diff changeset
328 // just in case, can't happen, ever, unless HG (or some other bad tool) produces index file
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diff changeset
329 // with inlined data of size greater than 2 Gb.
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diff changeset
330 throw new HgBadStateException("Data too big, offset didn't fit to sizeof(int)");
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diff changeset
331 }
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diff changeset
332 resOffsets.add(o + REVLOGV1_RECORD_SIZE * resOffsets.size());
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diff changeset
333 da.skip(3*4 + 32 + compressedLen); // Check: 44 (skip) + 20 (read) = 64 (total RevlogNG record size)
2
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diff changeset
334 } else {
9
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diff changeset
335 da.skip(3*4 + 32);
2
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diff changeset
336 }
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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diff changeset
337 if (da.isEmpty()) {
9
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diff changeset
338 // fine, done then
288
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diff changeset
339 baseRevisions = resBases.toArray(true);
198
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diff changeset
340 if (inline) {
288
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diff changeset
341 indexRecordOffset = resOffsets.toArray(true);
198
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diff changeset
342 }
9
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diff changeset
343 break;
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diff changeset
344 } else {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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diff changeset
345 // start reading next record
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diff changeset
346 long l = da.readLong();
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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diff changeset
347 offset = l >>> 16;
9
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diff changeset
348 }
2
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diff changeset
349 }
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diff changeset
350 } catch (IOException ex) {
366
189dc6dc1c3e Use exceptions to expose errors reading mercurial data
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diff changeset
351 ex.printStackTrace(); // FIXME, log error is not enough
198
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
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parents: 170
diff changeset
352 // too bad, no outline then, but don't fail with NPE
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parents: 170
diff changeset
353 baseRevisions = new int[0];
9
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diff changeset
354 } finally {
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diff changeset
355 da.done();
2
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diff changeset
356 }
3
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
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parents: 2
diff changeset
357 }
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
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parents: 2
diff changeset
358
242
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diff changeset
359 /**
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diff changeset
360 * operation with single file open/close and multiple diverse reads.
366
189dc6dc1c3e Use exceptions to expose errors reading mercurial data
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diff changeset
361 * XXX initOutline might need similar extraction to keep N1 format knowledge
242
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diff changeset
362 */
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diff changeset
363 class ReaderN1 {
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diff changeset
364 private final Inspector inspector;
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diff changeset
365 private final boolean needData;
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diff changeset
366 private DataAccess daIndex = null, daData = null;
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367 private Lifecycle.BasicCallback cb = null;
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368 private int lastRevisionRead = BAD_REVISION;
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369 private DataAccess lastUserData;
263
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370 // next are to track two major bottlenecks - patch application and actual time spent in inspector
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371 // private long applyTime, inspectorTime; // TIMING
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372
242
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373
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374 public ReaderN1(boolean needData, Inspector insp) {
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375 assert insp != null;
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376 this.needData = needData;
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377 inspector = insp;
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378 }
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379
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380 public void start(int totalWork) {
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381 daIndex = getIndexStream();
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382 if (needData && !inline) {
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383 daData = getDataStream();
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384 }
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385 if (inspector instanceof Lifecycle) {
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386 cb = new Lifecycle.BasicCallback();
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387 ((Lifecycle) inspector).start(totalWork, cb, cb);
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388 }
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389 // applyTime = inspectorTime = 0; // TIMING
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390 }
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391
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392 public void finish() {
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393 if (lastUserData != null) {
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394 lastUserData.done();
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395 lastUserData = null;
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396 }
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397 if (inspector instanceof Lifecycle) {
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398 ((Lifecycle) inspector).finish(cb);
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399 }
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400 daIndex.done();
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401 if (daData != null) {
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402 daData.done();
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403 }
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404 // System.out.printf("applyTime:%d ms, inspectorTime: %d ms\n", applyTime, inspectorTime); // TIMING
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405 }
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406
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407 public boolean range(int start, int end) throws IOException, HgException {
242
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408 byte[] nodeidBuf = new byte[20];
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409 int i;
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410 // it (i.e. replace with i >= start)
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411 if (needData && (i = getBaseRevision(start)) < start) {
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412 // if lastRevisionRead in [baseRevision(start), start) can reuse lastUserData
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413 // doesn't make sense to reuse if lastRevisionRead == start (too much to change in the cycle below).
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414 if (lastRevisionRead != BAD_REVISION && i <= lastRevisionRead && lastRevisionRead < start) {
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415 i = lastRevisionRead + 1; // start with first not-yet-read revision
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416 } else {
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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 }
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422 } else {
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423 // don't need to clean lastUserData as it's always null when !needData
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424 i = start;
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425 }
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426
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427 daIndex.seek(getIndexOffsetInt(i));
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428 //
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429 // reuse some instances
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430 final Patch patch = new Patch();
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431 final Inflater inflater = new Inflater();
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432 // can share buffer between instances of InflaterDataAccess as I never read any two of them in parallel
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433 final byte[] inflaterBuffer = new byte[1024];
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434 //
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435
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436 for (; i <= end; i++ ) {
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437 if (inline && needData) {
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438 // inspector reading data (though FilterDataAccess) may have affected index position
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439 daIndex.seek(getIndexOffsetInt(i));
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440 }
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441 long l = daIndex.readLong(); // 0
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442 long offset = i == 0 ? 0 : (l >>> 16);
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443 @SuppressWarnings("unused")
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444 int flags = (int) (l & 0X0FFFF);
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445 int compressedLen = daIndex.readInt(); // +8
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446 int actualLen = daIndex.readInt(); // +12
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447 int baseRevision = daIndex.readInt(); // +16
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448 int linkRevision = daIndex.readInt(); // +20
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449 int parent1Revision = daIndex.readInt();
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450 int parent2Revision = daIndex.readInt();
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451 // Hg has 32 bytes here, uses 20 for nodeid, and keeps 12 last bytes empty
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452 daIndex.readBytes(nodeidBuf, 0, 20); // +32
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453 daIndex.skip(12);
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454 DataAccess userDataAccess = null;
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455 if (needData) {
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456 int streamOffset;
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457 DataAccess streamDataAccess;
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458 if (inline) {
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459 streamDataAccess = daIndex;
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460 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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461 } else {
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462 streamOffset = (int) offset;
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463 streamDataAccess = daData;
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464 daData.seek(streamOffset);
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465 }
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466 final boolean patchToPrevious = baseRevision != i; // the only way I found to tell if it's a patch
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467 if (streamDataAccess.isEmpty()) {
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468 userDataAccess = new DataAccess(); // empty
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469 } else {
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470 final byte firstByte = streamDataAccess.readByte();
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471 if (firstByte == 0x78 /* 'x' */) {
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472 inflater.reset();
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473 userDataAccess = new InflaterDataAccess(streamDataAccess, streamOffset, compressedLen, patchToPrevious ? -1 : actualLen, inflater, inflaterBuffer);
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474 } else if (firstByte == 0x75 /* 'u' */) {
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475 userDataAccess = new FilterDataAccess(streamDataAccess, streamOffset+1, compressedLen-1);
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476 } else {
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477 // XXX Python impl in fact throws exception when there's not 'x', 'u' or '0'
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478 // but I don't see reason not to return data as is
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479 userDataAccess = new FilterDataAccess(streamDataAccess, streamOffset, compressedLen);
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480 }
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481 }
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482 // XXX
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483 if (patchToPrevious) {
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484 // this is a patch
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485 patch.read(userDataAccess);
242
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486 userDataAccess.done();
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487 //
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488 // it shall be reset at the end of prev iteration, when it got assigned from userDataAccess
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489 // however, actual userDataAccess and lastUserData may share Inflater object, which needs to be reset
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490 // Alternatively, userDataAccess.done() above may be responsible to reset Inflater (if it's InflaterDataAccess)
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491 lastUserData.reset();
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492 // final long startMeasuring = System.currentTimeMillis(); // TIMING
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493 byte[] userData = patch.apply(lastUserData, actualLen);
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494 // applyTime += (System.currentTimeMillis() - startMeasuring); // TIMING
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495 patch.clear(); // do not keep any reference, allow byte[] data to be gc'd
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496 userDataAccess = new ByteArrayDataAccess(userData);
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497 }
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498 } else {
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499 if (inline) {
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500 daIndex.skip(compressedLen);
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501 }
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502 }
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503 if (i >= start) {
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504 // final long startMeasuring = System.currentTimeMillis(); // TIMING
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505 inspector.next(i, actualLen, baseRevision, linkRevision, parent1Revision, parent2Revision, nodeidBuf, userDataAccess);
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506 // inspectorTime += (System.currentTimeMillis() - startMeasuring); // TIMING
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507 }
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508 if (cb != null) {
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509 if (cb.isStopped()) {
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510 return false;
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511 }
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512 }
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513 if (userDataAccess != null) {
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514 userDataAccess.reset(); // not sure this is necessary here, as lastUserData would get reset anyway before next use.
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515 }
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516 if (lastUserData != null) {
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517 lastUserData.done();
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518 }
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519 lastUserData = userDataAccess;
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520 }
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521 lastRevisionRead = end;
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522 return true;
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523 }
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524 }
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525
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526
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527 public interface Inspector {
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528 // XXX boolean retVal to indicate whether to continue?
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529 // 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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530 // implementers shall not invoke DataAccess.done(), it's accomplished by #iterate at appropraite moment
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531 void next(int revisionIndex, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[/*20*/] nodeid, DataAccess data) throws HgException;
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532 }
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533 }