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annotate src/org/tmatesoft/hg/internal/RevlogStream.java @ 242:ad6a046943be

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Improved reading of sparse revisions from a revlog
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 23 Jun 2011 15:19:07 +0200
parents 80a3433ace91
children 0e01f9182e16
rev   line source
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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.ArrayList;
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25 import java.util.LinkedList;
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26 import java.util.List;
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27
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28 import org.tmatesoft.hg.core.HgBadStateException;
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29 import org.tmatesoft.hg.core.Nodeid;
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30 import org.tmatesoft.hg.repo.HgRepository;
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33 /**
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34 * ? Single RevlogStream per file per repository with accessor to record access session (e.g. with back/forward operations),
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35 * or numerous RevlogStream with separate representation of the underlying data (cached, lazy ChunkStream)?
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36 *
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37 * @see http://mercurial.selenic.com/wiki/Revlog
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38 * @see http://mercurial.selenic.com/wiki/RevlogNG
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39 *
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40 * @author Artem Tikhomirov
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41 * @author TMate Software Ltd.
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42 */
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43 public class RevlogStream {
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44
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45 /*
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46 * 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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47 *
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48 * long[] in fact (there are 8-bytes field in the revlog)
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49 * However, (a) DataAccess currently doesn't operate with long seek/length
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50 * and, of greater significance, (b) files with inlined data are designated for smaller files,
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51 * guess, about 130 Kb, and offset there won't ever break int capacity
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52 */
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53 private int[] indexRecordOffset;
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54 private int[] baseRevisions;
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55 private boolean inline = false;
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56 private final File indexFile;
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57 private final DataAccessProvider dataAccess;
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58
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59 // if we need anything else from HgRepo, might replace DAP parameter with HgRepo and query it for DAP.
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60 public RevlogStream(DataAccessProvider dap, File indexFile) {
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61 this.dataAccess = dap;
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62 this.indexFile = indexFile;
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63 }
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65 /*package*/ DataAccess getIndexStream() {
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66 return dataAccess.create(indexFile);
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67 }
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69 /*package*/ DataAccess getDataStream() {
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70 final String indexName = indexFile.getName();
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71 File dataFile = new File(indexFile.getParentFile(), indexName.substring(0, indexName.length() - 1) + "d");
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72 return dataAccess.create(dataFile);
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73 }
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75 public int revisionCount() {
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76 initOutline();
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77 return baseRevisions.length;
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78 }
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79
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80 public int dataLength(int revision) {
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81 // XXX in fact, use of iterate() instead of this implementation may be quite reasonable.
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82 //
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83 final int indexSize = revisionCount();
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84 DataAccess daIndex = getIndexStream(); // XXX may supply a hint that I'll need really few bytes of data (although at some offset)
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85 if (revision == TIP) {
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86 revision = indexSize - 1;
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87 }
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88 try {
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89 int recordOffset = getIndexOffsetInt(revision);
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90 daIndex.seek(recordOffset + 12); // 6+2+4
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91 int actualLen = daIndex.readInt();
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92 return actualLen;
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93 } catch (IOException ex) {
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94 ex.printStackTrace(); // log error. FIXME better handling
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95 throw new IllegalStateException(ex);
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96 } finally {
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97 daIndex.done();
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98 }
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99 }
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100
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101 public byte[] nodeid(int revision) {
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102 final int indexSize = revisionCount();
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103 if (revision == TIP) {
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104 revision = indexSize - 1;
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105 }
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106 if (revision < 0 || revision >= indexSize) {
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107 throw new IllegalArgumentException(Integer.toString(revision));
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108 }
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109 DataAccess daIndex = getIndexStream();
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110 try {
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111 int recordOffset = getIndexOffsetInt(revision);
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112 daIndex.seek(recordOffset + 32);
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113 byte[] rv = new byte[20];
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114 daIndex.readBytes(rv, 0, 20);
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115 return rv;
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116 } catch (IOException ex) {
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117 ex.printStackTrace();
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118 throw new IllegalStateException();
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119 } finally {
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120 daIndex.done();
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121 }
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122 }
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123
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124 public int linkRevision(int revision) {
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125 final int last = revisionCount() - 1;
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126 if (revision == TIP) {
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127 revision = last;
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128 }
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129 if (revision < 0 || revision > last) {
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130 throw new IllegalArgumentException(Integer.toString(revision));
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131 }
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132 DataAccess daIndex = getIndexStream();
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133 try {
198
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134 int recordOffset = getIndexOffsetInt(revision);
88
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135 daIndex.seek(recordOffset + 20);
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136 int linkRev = daIndex.readInt();
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137 return linkRev;
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138 } catch (IOException ex) {
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139 ex.printStackTrace();
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140 throw new IllegalStateException();
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141 } finally {
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142 daIndex.done();
80
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143 }
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144 }
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145
49
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146 // Perhaps, RevlogStream should be limited to use of plain int revisions for access,
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147 // while Nodeids should be kept on the level up, in Revlog. Guess, Revlog better keep
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148 // map of nodeids, and once this comes true, we may get rid of this method.
80
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149 // Unlike its counterpart, {@link Revlog#getLocalRevisionNumber()}, doesn't fail with exception if node not found,
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150 /**
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151 * @return integer in [0..revisionCount()) or {@link HgRepository#BAD_REVISION} if not found
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152 */
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153 public int findLocalRevisionNumber(Nodeid nodeid) {
22
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154 // XXX this one may be implemented with iterate() once there's mechanism to stop iterations
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155 final int indexSize = revisionCount();
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156 DataAccess daIndex = getIndexStream();
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157 try {
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158 byte[] nodeidBuf = new byte[20];
22
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159 for (int i = 0; i < indexSize; i++) {
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160 daIndex.skip(8);
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161 int compressedLen = daIndex.readInt();
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162 daIndex.skip(20);
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163 daIndex.readBytes(nodeidBuf, 0, 20);
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164 if (nodeid.equalsTo(nodeidBuf)) {
22
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165 return i;
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166 }
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167 daIndex.skip(inline ? 12 + compressedLen : 12);
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168 }
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169 } catch (IOException ex) {
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170 ex.printStackTrace(); // log error. FIXME better handling
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171 throw new IllegalStateException(ex);
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172 } finally {
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173 daIndex.done();
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174 }
80
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175 return BAD_REVISION;
22
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176 }
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177
2
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178
9
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179 private final int REVLOGV1_RECORD_SIZE = 64;
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180
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181 // should be possible to use TIP, ALL, or -1, -2, -n notation of Hg
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182 // ? boolean needsNodeid
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183 public void iterate(int start, int end, boolean needData, Inspector inspector) {
2
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184 initOutline();
198
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185 final int indexSize = revisionCount();
3
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186 if (indexSize == 0) {
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187 return;
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188 }
5
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189 if (end == TIP) {
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190 end = indexSize - 1;
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191 }
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192 if (start == TIP) {
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193 start = indexSize - 1;
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194 }
2
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195 if (start < 0 || start >= indexSize) {
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d5268ca7715b Merged branch wrap-data-access into default for resource-friendly data access. Updated API to promote that friendliness to clients (channels, not byte[]). More exceptions
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196 throw new IllegalArgumentException(String.format("Bad left range boundary %d in [0..%d]", start, indexSize-1));
2
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diff changeset
197 }
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diff changeset
198 if (end < start || end >= indexSize) {
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diff changeset
199 throw new IllegalArgumentException(String.format("Bad right range boundary %d in [0..%d]", end, indexSize-1));
2
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200 }
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diff changeset
201 // XXX may cache [start .. end] from index with a single read (pre-read)
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diff changeset
202
242
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diff changeset
203 ReaderN1 r = new ReaderN1(needData, inspector);
2
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diff changeset
204 try {
242
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diff changeset
205 r.start(end - start + 1);
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diff changeset
206 r.range(start, end);
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parents: 223
diff changeset
207 } catch (IOException ex) {
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diff changeset
208 throw new HgBadStateException(ex); // FIXME need better handling
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diff changeset
209 } finally {
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diff changeset
210 r.finish();
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diff changeset
211 }
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diff changeset
212 }
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diff changeset
213
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diff changeset
214 /**
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diff changeset
215 * Effective alternative to {@link #iterate(int, int, boolean, Inspector) batch read}, when only few selected
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diff changeset
216 * revisions are of interest.
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diff changeset
217 * @param sortedRevisions revisions to walk, in ascending order.
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diff changeset
218 * @param needData whether inspector needs access to header only
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diff changeset
219 * @param inspector callback to process entries
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diff changeset
220 */
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diff changeset
221 public void iterate(int[] sortedRevisions, boolean needData, Inspector inspector) {
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diff changeset
222 final int indexSize = revisionCount();
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parents: 223
diff changeset
223 if (indexSize == 0 || sortedRevisions.length == 0) {
ad6a046943be Improved reading of sparse revisions from a revlog
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parents: 223
diff changeset
224 return;
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parents: 223
diff changeset
225 }
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parents: 223
diff changeset
226 if (sortedRevisions[0] > indexSize || sortedRevisions[sortedRevisions.length - 1] > indexSize) {
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parents: 223
diff changeset
227 throw new IllegalArgumentException(String.format("Can't iterate [%d, %d] in range [0..%d]", sortedRevisions[0], sortedRevisions[sortedRevisions.length - 1], indexSize));
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parents: 223
diff changeset
228 }
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diff changeset
229
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diff changeset
230 ReaderN1 r = new ReaderN1(needData, inspector);
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diff changeset
231 try {
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diff changeset
232 r.start(sortedRevisions.length);
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parents: 223
diff changeset
233 for (int i = 0; i < sortedRevisions.length; ) {
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parents: 223
diff changeset
234 int x = i;
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diff changeset
235 i++;
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diff changeset
236 while (i < sortedRevisions.length) {
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diff changeset
237 if (sortedRevisions[i] == sortedRevisions[i-1] + 1) {
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diff changeset
238 i++;
2
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parents: 0
diff changeset
239 } 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
240 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
241 }
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
242 }
242
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diff changeset
243 // commitRevisions[x..i-1] are sequential
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diff changeset
244 if (!r.range(sortedRevisions[x], sortedRevisions[i-1])) {
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diff changeset
245 return;
51
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
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parents: 49
diff changeset
246 }
2
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diff changeset
247 }
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diff changeset
248 } catch (IOException ex) {
158
b413b16d10a5 Integer offsets and file length explictly, rather than casts throughout code. Inflater may benefit from total length hint, but shall calculate it by its own if needed
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parents: 157
diff changeset
249 throw new HgBadStateException(ex); // FIXME need better handling
3
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parents: 2
diff changeset
250 } finally {
242
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diff changeset
251 r.finish();
2
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diff changeset
252 }
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diff changeset
253 }
198
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
254
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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diff changeset
255 private int getBaseRevision(int revision) {
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256 return baseRevisions[revision];
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257 }
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258
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259 /**
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260 * @return offset of the revision's record in the index (.i) stream
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261 */
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262 private int getIndexOffsetInt(int revision) {
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263 return inline ? indexRecordOffset[revision] : revision * REVLOGV1_RECORD_SIZE;
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264 }
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265
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266 private void initOutline() {
198
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267 if (baseRevisions != null && baseRevisions.length > 0) {
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268 return;
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269 }
198
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270 ArrayList<Integer> resBases = new ArrayList<Integer>();
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271 ArrayList<Integer> resOffsets = new ArrayList<Integer>();
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272 DataAccess da = getIndexStream();
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273 try {
202
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274 if (da.isEmpty()) {
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275 // do not fail with exception if stream is empty, it's likely intentional
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276 baseRevisions = new int[0];
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277 return;
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278 }
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279 int versionField = da.readInt();
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280 da.readInt(); // just to skip next 4 bytes of offset + flags
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281 final int INLINEDATA = 1 << 16;
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282 inline = (versionField & INLINEDATA) != 0;
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283 long offset = 0; // first offset is always 0, thus Hg uses it for other purposes
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284 while(true) {
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285 int compressedLen = da.readInt();
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286 // 8+4 = 12 bytes total read here
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287 @SuppressWarnings("unused")
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288 int actualLen = da.readInt();
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289 int baseRevision = da.readInt();
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290 // 12 + 8 = 20 bytes read here
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291 // int linkRevision = di.readInt();
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292 // int parent1Revision = di.readInt();
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293 // int parent2Revision = di.readInt();
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294 // byte[] nodeid = new byte[32];
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295 resBases.add(baseRevision);
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296 if (inline) {
198
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297 int o = (int) offset;
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298 if (o != offset) {
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299 // just in case, can't happen, ever, unless HG (or some other bad tool) produces index file
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300 // with inlined data of size greater than 2 Gb.
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301 throw new HgBadStateException("Data too big, offset didn't fit to sizeof(int)");
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302 }
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303 resOffsets.add(o + REVLOGV1_RECORD_SIZE * resOffsets.size());
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304 da.skip(3*4 + 32 + compressedLen); // Check: 44 (skip) + 20 (read) = 64 (total RevlogNG record size)
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305 } else {
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306 da.skip(3*4 + 32);
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307 }
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308 if (da.isEmpty()) {
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309 // fine, done then
198
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310 baseRevisions = toArray(resBases);
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311 if (inline) {
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312 indexRecordOffset = toArray(resOffsets);
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313 }
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314 break;
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315 } else {
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316 // start reading next record
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317 long l = da.readLong();
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318 offset = l >>> 16;
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319 }
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320 }
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321 } catch (IOException ex) {
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322 ex.printStackTrace(); // log error
198
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323 // too bad, no outline then, but don't fail with NPE
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324 baseRevisions = new int[0];
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325 } finally {
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326 da.done();
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327 }
3
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328 }
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329
242
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330 /**
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331 * operation with single file open/close and multiple diverse reads.
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332 * XXX initOutline might need similar extraction to keen N1 format knowledge
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333 */
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334 class ReaderN1 {
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335 private final Inspector inspector;
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336 private final boolean needData;
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337 private DataAccess daIndex = null, daData = null;
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338 private Lifecycle.BasicCallback cb = null;
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339 private int lastRevisionRead = BAD_REVISION;
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340 private DataAccess lastUserData;
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341
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342 public ReaderN1(boolean needData, Inspector insp) {
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343 assert insp != null;
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344 this.needData = needData;
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345 inspector = insp;
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346 }
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347
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348 public void start(int totalWork) {
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349 daIndex = getIndexStream();
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350 if (needData && !inline) {
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351 daData = getDataStream();
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352 }
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353 if (inspector instanceof Lifecycle) {
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354 cb = new Lifecycle.BasicCallback();
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355 ((Lifecycle) inspector).start(totalWork, cb, cb);
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356 }
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357 }
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358
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359 public void finish() {
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360 if (lastUserData != null) {
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361 lastUserData.done();
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362 lastUserData = null;
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363 }
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364 if (inspector instanceof Lifecycle) {
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365 ((Lifecycle) inspector).finish(cb);
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366 }
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367 daIndex.done();
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368 if (daData != null) {
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369 daData.done();
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370 }
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371 }
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372
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373 public boolean range(int start, int end) throws IOException {
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374 // System.out.printf("RevlogStream.ReaderN1.range(): [%d, %d]\n", start, end);
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375 byte[] nodeidBuf = new byte[20];
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376 int i;
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377 boolean extraReadsToBaseRev = false; // to indicate we read revision prior to start. XXX not sure can't do without
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378 // it (i.e. replace with i >= start)
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379 if (needData && (i = getBaseRevision(start)) < start) {
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380 // if lastRevisionRead in [baseRevision(start), start) can reuse lastUserData
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381 // doesn't make sense to reuse if lastRevisionRead == start (too much to change in the cycle below).
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382 if (lastRevisionRead != BAD_REVISION && i <= lastRevisionRead && lastRevisionRead < start) {
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383 i = lastRevisionRead + 1; // start with first not-yet-read revision
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384 extraReadsToBaseRev = i < start;
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385 } else {
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386 if (lastUserData != null) {
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387 lastUserData.done();
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388 lastUserData = null;
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389 }
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390 extraReadsToBaseRev = true;
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391 }
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392 } else {
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393 // don't need to clean lastUserData as it's always null when !needData
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394 i = start;
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395 }
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396
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397 daIndex.seek(getIndexOffsetInt(i));
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398
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399 for (; i <= end; i++ ) {
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400 if (inline && needData) {
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401 // inspector reading data (though FilterDataAccess) may have affected index position
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402 daIndex.seek(getIndexOffsetInt(i));
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403 }
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404 long l = daIndex.readLong(); // 0
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405 long offset = i == 0 ? 0 : (l >>> 16);
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406 @SuppressWarnings("unused")
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407 int flags = (int) (l & 0X0FFFF);
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408 int compressedLen = daIndex.readInt(); // +8
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409 int actualLen = daIndex.readInt(); // +12
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410 int baseRevision = daIndex.readInt(); // +16
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411 int linkRevision = daIndex.readInt(); // +20
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412 int parent1Revision = daIndex.readInt();
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413 int parent2Revision = daIndex.readInt();
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414 // Hg has 32 bytes here, uses 20 for nodeid, and keeps 12 last bytes empty
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415 daIndex.readBytes(nodeidBuf, 0, 20); // +32
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416 daIndex.skip(12);
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417 DataAccess userDataAccess = null;
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418 if (needData) {
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419 int streamOffset;
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420 DataAccess streamDataAccess;
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421 if (inline) {
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422 streamDataAccess = daIndex;
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423 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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424 } else {
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425 streamOffset = (int) offset;
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426 streamDataAccess = daData;
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427 daData.seek(streamOffset);
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428 }
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429 final boolean patchToPrevious = baseRevision != i; // the only way I found to tell if it's a patch
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430 if (streamDataAccess.isEmpty()) {
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431 userDataAccess = new DataAccess(); // empty
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432 } else {
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433 final byte firstByte = streamDataAccess.readByte();
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434 if (firstByte == 0x78 /* 'x' */) {
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435 userDataAccess = new InflaterDataAccess(streamDataAccess, streamOffset, compressedLen, patchToPrevious ? -1 : actualLen);
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436 } else if (firstByte == 0x75 /* 'u' */) {
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437 userDataAccess = new FilterDataAccess(streamDataAccess, streamOffset+1, compressedLen-1);
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438 } else {
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439 // XXX Python impl in fact throws exception when there's not 'x', 'u' or '0'
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440 // but I don't see reason not to return data as is
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441 userDataAccess = new FilterDataAccess(streamDataAccess, streamOffset, compressedLen);
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442 }
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443 }
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444 // XXX
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445 if (patchToPrevious) {
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446 // this is a patch
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447 LinkedList<PatchRecord> patches = new LinkedList<PatchRecord>();
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448 while (!userDataAccess.isEmpty()) {
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449 PatchRecord pr = PatchRecord.read(userDataAccess);
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450 // System.out.printf("PatchRecord:%d %d %d\n", pr.start, pr.end, pr.len);
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451 patches.add(pr);
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452 }
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453 userDataAccess.done();
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454 //
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455 byte[] userData = apply(lastUserData, actualLen, patches);
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456 userDataAccess = new ByteArrayDataAccess(userData);
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457 }
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458 } else {
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459 if (inline) {
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460 daIndex.skip(compressedLen);
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461 }
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462 }
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463 if (!extraReadsToBaseRev || i >= start) {
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diff changeset
464 inspector.next(i, actualLen, baseRevision, linkRevision, parent1Revision, parent2Revision, nodeidBuf, userDataAccess);
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465 }
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diff changeset
466 if (cb != null) {
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467 if (cb.isStopped()) {
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468 return false;
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469 }
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diff changeset
470 }
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471 if (userDataAccess != null) {
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472 userDataAccess.reset();
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473 if (lastUserData != null) {
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474 lastUserData.done();
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475 }
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diff changeset
476 lastUserData = userDataAccess;
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477 }
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478 }
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479 lastRevisionRead = end;
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480 return true;
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481 }
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482 }
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483
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484
198
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diff changeset
485 private static int[] toArray(List<Integer> l) {
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486 int[] rv = new int[l.size()];
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diff changeset
487 for (int i = 0; i < rv.length; i++) {
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diff changeset
488 rv[i] = l.get(i);
2
08db726a0fb7 Shaping out low-level Hg structures
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489 }
198
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490 return rv;
2
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491 }
198
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492
3
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493
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494 // mpatch.c : apply()
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495 // FIXME need to implement patch merge (fold, combine, gather and discard from aforementioned mpatch.[c|py]), also see Revlog and Mercurial PDF
157
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496 public/*for HgBundle; until moved to better place*/static byte[] apply(DataAccess baseRevisionContent, int outcomeLen, List<PatchRecord> patch) throws IOException {
3
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497 int last = 0, destIndex = 0;
43
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diff changeset
498 if (outcomeLen == -1) {
158
b413b16d10a5 Integer offsets and file length explictly, rather than casts throughout code. Inflater may benefit from total length hint, but shall calculate it by its own if needed
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499 outcomeLen = baseRevisionContent.length();
43
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500 for (PatchRecord pr : patch) {
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501 outcomeLen += pr.start - last + pr.len;
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diff changeset
502 last = pr.end;
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503 }
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504 outcomeLen -= last;
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505 last = 0;
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506 }
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507 byte[] rv = new byte[outcomeLen];
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508 for (PatchRecord pr : patch) {
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509 baseRevisionContent.seek(last);
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510 baseRevisionContent.readBytes(rv, destIndex, pr.start-last);
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511 destIndex += pr.start - last;
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512 System.arraycopy(pr.data, 0, rv, destIndex, pr.data.length);
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513 destIndex += pr.data.length;
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514 last = pr.end;
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515 }
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516 baseRevisionContent.seek(last);
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517 baseRevisionContent.readBytes(rv, destIndex, (int) (baseRevisionContent.length() - last));
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518 return rv;
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519 }
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520
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521 // @see http://mercurial.selenic.com/wiki/BundleFormat, in Changelog group description
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522 public static class PatchRecord {
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523 /*
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524 Given there are pr1 and pr2:
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525 pr1.start to pr1.end will be replaced with pr's data (of pr1.len)
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526 pr1.end to pr2.start gets copied from base
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527 */
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528 public int start, end, len;
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529 public byte[] data;
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530
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531 // TODO consider PatchRecord that only records data position (absolute in data source), and acquires data as needed
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532 private PatchRecord(int p1, int p2, int length, byte[] src) {
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533 start = p1;
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534 end = p2;
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535 len = length;
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536 data = src;
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537 }
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538
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539 /*package-local*/ static PatchRecord read(byte[] data, int offset) {
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540 final int x = offset; // shorthand
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541 int p1 = ((data[x] & 0xFF)<< 24) | ((data[x+1] & 0xFF) << 16) | ((data[x+2] & 0xFF) << 8) | (data[x+3] & 0xFF);
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542 int p2 = ((data[x+4] & 0xFF) << 24) | ((data[x+5] & 0xFF) << 16) | ((data[x+6] & 0xFF) << 8) | (data[x+7] & 0xFF);
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543 int len = ((data[x+8] & 0xFF) << 24) | ((data[x+9] & 0xFF) << 16) | ((data[x+10] & 0xFF) << 8) | (data[x+11] & 0xFF);
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544 byte[] dataCopy = new byte[len];
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545 System.arraycopy(data, x+12, dataCopy, 0, len);
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546 return new PatchRecord(p1, p2, len, dataCopy);
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547 }
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548
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549 public /*for HgBundle*/ static PatchRecord read(DataAccess da) throws IOException {
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550 int p1 = da.readInt();
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551 int p2 = da.readInt();
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552 int len = da.readInt();
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553 byte[] src = new byte[len];
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554 da.readBytes(src, 0, len);
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555 return new PatchRecord(p1, p2, len, src);
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556 }
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557 }
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558
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559 // FIXME byte[] data might be too expensive, for few usecases it may be better to have intermediate Access object (when we don't need full data
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560 // instantly - e.g. calculate hash, or comparing two revisions
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561 public interface Inspector {
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562 // XXX boolean retVal to indicate whether to continue?
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563 // 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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564 // implementers shall not invoke DataAccess.done(), it's accomplished by #iterate at appropraite moment
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diff changeset
565 void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[/*20*/] nodeid, DataAccess data);
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566 }
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567 }