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annotate src/org/tmatesoft/hg/internal/RevlogStream.java @ 300:650b45d290b1

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Share range check code
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Sat, 17 Sep 2011 13:41:04 +0200
parents e7ca6f16d074
children 694ebabb5cb3
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.List;
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26 import java.util.zip.Inflater;
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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.HgInternals;
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31 import org.tmatesoft.hg.repo.HgRepository;
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34 /**
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35 * ? Single RevlogStream per file per repository with accessor to record access session (e.g. with back/forward operations),
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36 * or numerous RevlogStream with separate representation of the underlying data (cached, lazy ChunkStream)?
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37 *
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38 * @see http://mercurial.selenic.com/wiki/Revlog
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39 * @see http://mercurial.selenic.com/wiki/RevlogNG
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40 *
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41 * @author Artem Tikhomirov
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42 * @author TMate Software Ltd.
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43 */
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44 public class RevlogStream {
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46 /*
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47 * makes sense for index with inline data only - actual offset of the record in the .i file (record entry + revision * record size))
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48 *
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49 * long[] in fact (there are 8-bytes field in the revlog)
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50 * However, (a) DataAccess currently doesn't operate with long seek/length
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51 * and, of greater significance, (b) files with inlined data are designated for smaller files,
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52 * guess, about 130 Kb, and offset there won't ever break int capacity
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53 */
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54 private int[] indexRecordOffset;
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55 private int[] baseRevisions;
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56 private boolean inline = false;
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57 private final File indexFile;
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58 private final DataAccessProvider dataAccess;
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59
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60 // if we need anything else from HgRepo, might replace DAP parameter with HgRepo and query it for DAP.
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61 public RevlogStream(DataAccessProvider dap, File indexFile) {
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62 this.dataAccess = dap;
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63 this.indexFile = indexFile;
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64 }
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66 /*package*/ DataAccess getIndexStream() {
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67 // XXX may supply a hint that I'll need really few bytes of data (perhaps, at some offset)
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68 // to avoid mmap files when only few bytes are to be read (i.e. #dataLength())
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69 return dataAccess.create(indexFile);
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70 }
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72 /*package*/ DataAccess getDataStream() {
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73 final String indexName = indexFile.getName();
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74 File dataFile = new File(indexFile.getParentFile(), indexName.substring(0, indexName.length() - 1) + "d");
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75 return dataAccess.create(dataFile);
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76 }
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78 public int revisionCount() {
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79 initOutline();
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80 return baseRevisions.length;
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81 }
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83 /**
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84 * @throws HgBadStateException if internal read operation failed
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85 */
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86 public int dataLength(int revision) {
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87 // XXX in fact, use of iterate() instead of this implementation may be quite reasonable.
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88 //
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89 final int indexSize = revisionCount();
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90 DataAccess daIndex = getIndexStream();
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91 if (revision == TIP) {
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92 revision = indexSize - 1;
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93 }
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94 try {
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95 int recordOffset = getIndexOffsetInt(revision);
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96 daIndex.seek(recordOffset + 12); // 6+2+4
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97 int actualLen = daIndex.readInt();
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98 return actualLen;
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99 } catch (IOException ex) {
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100 ex.printStackTrace(); // log error. FIXME better handling
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101 throw new HgBadStateException(ex);
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102 } finally {
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103 daIndex.done();
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104 }
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105 }
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106
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107 /**
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108 * @throws HgBadStateException if internal read operation failed
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109 */
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110 public byte[] nodeid(int revision) {
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111 final int indexSize = revisionCount();
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112 if (revision == TIP) {
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113 revision = indexSize - 1;
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114 }
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115 if (revision < 0 || revision >= indexSize) {
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116 throw new IllegalArgumentException(Integer.toString(revision));
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117 }
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118 DataAccess daIndex = getIndexStream();
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119 try {
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120 int recordOffset = getIndexOffsetInt(revision);
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121 daIndex.seek(recordOffset + 32);
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122 byte[] rv = new byte[20];
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123 daIndex.readBytes(rv, 0, 20);
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124 return rv;
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125 } catch (IOException ex) {
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126 ex.printStackTrace();
295
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127 throw new HgBadStateException();
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128 } finally {
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129 daIndex.done();
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130 }
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131 }
295
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132
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133 /**
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134 * Get link field from the index record.
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135 * @throws HgBadStateException if internal read operation failed
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136 */
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137 public int linkRevision(int revision) {
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138 final int last = revisionCount() - 1;
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139 if (revision == TIP) {
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140 revision = last;
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141 }
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142 if (revision < 0 || revision > last) {
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143 throw new IllegalArgumentException(Integer.toString(revision));
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144 }
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145 DataAccess daIndex = getIndexStream();
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146 try {
198
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147 int recordOffset = getIndexOffsetInt(revision);
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148 daIndex.seek(recordOffset + 20);
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149 int linkRev = daIndex.readInt();
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150 return linkRev;
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151 } catch (IOException ex) {
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152 ex.printStackTrace();
295
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153 throw new HgBadStateException();
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154 } finally {
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155 daIndex.done();
80
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156 }
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157 }
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158
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159 // Perhaps, RevlogStream should be limited to use of plain int revisions for access,
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160 // while Nodeids should be kept on the level up, in Revlog. Guess, Revlog better keep
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161 // map of nodeids, and once this comes true, we may get rid of this method.
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162 // Unlike its counterpart, {@link Revlog#getLocalRevisionNumber()}, doesn't fail with exception if node not found,
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163 /**
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164 * @return integer in [0..revisionCount()) or {@link HgRepository#BAD_REVISION} if not found
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165 */
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166 public int findLocalRevisionNumber(Nodeid nodeid) {
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167 // XXX this one may be implemented with iterate() once there's mechanism to stop iterations
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168 final int indexSize = revisionCount();
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169 DataAccess daIndex = getIndexStream();
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170 try {
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171 byte[] nodeidBuf = new byte[20];
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172 for (int i = 0; i < indexSize; i++) {
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173 daIndex.skip(8);
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174 int compressedLen = daIndex.readInt();
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175 daIndex.skip(20);
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176 daIndex.readBytes(nodeidBuf, 0, 20);
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177 if (nodeid.equalsTo(nodeidBuf)) {
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178 return i;
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179 }
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180 daIndex.skip(inline ? 12 + compressedLen : 12);
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181 }
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182 } catch (IOException ex) {
243
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183 ex.printStackTrace(); // log error. FIXME better handling. Perhaps, shall return BAD_REVISION here as well?
22
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184 throw new IllegalStateException(ex);
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185 } finally {
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186 daIndex.done();
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187 }
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188 return BAD_REVISION;
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189 }
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190
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191
9
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192 private final int REVLOGV1_RECORD_SIZE = 64;
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193
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194 // should be possible to use TIP, ALL, or -1, -2, -n notation of Hg
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195 // ? boolean needsNodeid
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196 public void iterate(int start, int end, boolean needData, Inspector inspector) {
2
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197 initOutline();
198
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198 final int indexSize = revisionCount();
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199 if (indexSize == 0) {
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200 return;
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201 }
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202 if (end == TIP) {
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203 end = indexSize - 1;
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204 }
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205 if (start == TIP) {
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206 start = indexSize - 1;
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207 }
300
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208 HgInternals.checkRevlogRange(start, end, indexSize-1);
2
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209 // XXX may cache [start .. end] from index with a single read (pre-read)
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210
242
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211 ReaderN1 r = new ReaderN1(needData, inspector);
2
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212 try {
242
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213 r.start(end - start + 1);
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214 r.range(start, end);
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215 } catch (IOException ex) {
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216 throw new HgBadStateException(ex); // FIXME need better handling
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217 } finally {
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218 r.finish();
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219 }
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220 }
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221
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diff changeset
222 /**
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223 * Effective alternative to {@link #iterate(int, int, boolean, Inspector) batch read}, when only few selected
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diff changeset
224 * revisions are of interest.
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diff changeset
225 * @param sortedRevisions revisions to walk, in ascending order.
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226 * @param needData whether inspector needs access to header only
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227 * @param inspector callback to process entries
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228 */
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diff changeset
229 public void iterate(int[] sortedRevisions, boolean needData, Inspector inspector) {
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230 final int indexSize = revisionCount();
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231 if (indexSize == 0 || sortedRevisions.length == 0) {
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232 return;
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233 }
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234 if (sortedRevisions[0] > indexSize || sortedRevisions[sortedRevisions.length - 1] > indexSize) {
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diff changeset
235 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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236 }
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237
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238 ReaderN1 r = new ReaderN1(needData, inspector);
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diff changeset
239 try {
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240 r.start(sortedRevisions.length);
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diff changeset
241 for (int i = 0; i < sortedRevisions.length; ) {
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242 int x = i;
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diff changeset
243 i++;
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244 while (i < sortedRevisions.length) {
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diff changeset
245 if (sortedRevisions[i] == sortedRevisions[i-1] + 1) {
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diff changeset
246 i++;
2
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diff changeset
247 } else {
217
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diff changeset
248 break;
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diff changeset
249 }
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diff changeset
250 }
242
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diff changeset
251 // commitRevisions[x..i-1] are sequential
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diff changeset
252 if (!r.range(sortedRevisions[x], sortedRevisions[i-1])) {
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diff changeset
253 return;
51
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diff changeset
254 }
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255 }
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256 } catch (IOException ex) {
158
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257 throw new HgBadStateException(ex); // FIXME need better handling
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258 } finally {
242
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259 r.finish();
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260 }
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261 }
198
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262
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263 private int getBaseRevision(int revision) {
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264 return baseRevisions[revision];
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265 }
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266
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267 /**
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268 * @return offset of the revision's record in the index (.i) stream
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269 */
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270 private int getIndexOffsetInt(int revision) {
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271 return inline ? indexRecordOffset[revision] : revision * REVLOGV1_RECORD_SIZE;
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272 }
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273
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274 private void initOutline() {
198
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275 if (baseRevisions != null && baseRevisions.length > 0) {
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276 return;
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277 }
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278 DataAccess da = getIndexStream();
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279 try {
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280 if (da.isEmpty()) {
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281 // do not fail with exception if stream is empty, it's likely intentional
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282 baseRevisions = new int[0];
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283 return;
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284 }
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285 int versionField = da.readInt();
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286 da.readInt(); // just to skip next 4 bytes of offset + flags
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287 final int INLINEDATA = 1 << 16;
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288 inline = (versionField & INLINEDATA) != 0;
288
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289 IntVector resBases, resOffsets = null;
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290 int entryCountGuess = da.length() / REVLOGV1_RECORD_SIZE;
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291 if (inline) {
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292 entryCountGuess >>>= 2; // pure guess, assume useful data takes 3/4 of total space
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293 resOffsets = new IntVector(entryCountGuess, 5000);
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294 }
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295 resBases = new IntVector(entryCountGuess, 5000);
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296
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297 long offset = 0; // first offset is always 0, thus Hg uses it for other purposes
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298 while(true) {
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299 int compressedLen = da.readInt();
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300 // 8+4 = 12 bytes total read here
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301 @SuppressWarnings("unused")
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302 int actualLen = da.readInt();
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303 int baseRevision = da.readInt();
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304 // 12 + 8 = 20 bytes read here
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305 // int linkRevision = di.readInt();
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306 // int parent1Revision = di.readInt();
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307 // int parent2Revision = di.readInt();
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308 // byte[] nodeid = new byte[32];
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309 resBases.add(baseRevision);
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310 if (inline) {
198
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311 int o = (int) offset;
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312 if (o != offset) {
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313 // just in case, can't happen, ever, unless HG (or some other bad tool) produces index file
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314 // with inlined data of size greater than 2 Gb.
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315 throw new HgBadStateException("Data too big, offset didn't fit to sizeof(int)");
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316 }
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317 resOffsets.add(o + REVLOGV1_RECORD_SIZE * resOffsets.size());
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318 da.skip(3*4 + 32 + compressedLen); // Check: 44 (skip) + 20 (read) = 64 (total RevlogNG record size)
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319 } else {
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320 da.skip(3*4 + 32);
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321 }
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322 if (da.isEmpty()) {
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323 // fine, done then
288
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324 baseRevisions = resBases.toArray(true);
198
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325 if (inline) {
288
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326 indexRecordOffset = resOffsets.toArray(true);
198
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327 }
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328 break;
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329 } else {
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330 // start reading next record
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331 long l = da.readLong();
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332 offset = l >>> 16;
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333 }
2
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334 }
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335 } catch (IOException ex) {
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336 ex.printStackTrace(); // log error
198
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337 // too bad, no outline then, but don't fail with NPE
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338 baseRevisions = new int[0];
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339 } finally {
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340 da.done();
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341 }
3
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342 }
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343
242
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344 /**
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345 * operation with single file open/close and multiple diverse reads.
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346 * XXX initOutline might need similar extraction to keen N1 format knowledge
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347 */
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348 class ReaderN1 {
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349 private final Inspector inspector;
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350 private final boolean needData;
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351 private DataAccess daIndex = null, daData = null;
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352 private Lifecycle.BasicCallback cb = null;
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353 private int lastRevisionRead = BAD_REVISION;
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354 private DataAccess lastUserData;
263
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355 // next are to track two major bottlenecks - patch application and actual time spent in inspector
264
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356 // private long applyTime, inspectorTime; // TIMING
263
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357
242
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358
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359 public ReaderN1(boolean needData, Inspector insp) {
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360 assert insp != null;
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361 this.needData = needData;
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362 inspector = insp;
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363 }
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364
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365 public void start(int totalWork) {
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366 daIndex = getIndexStream();
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367 if (needData && !inline) {
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368 daData = getDataStream();
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369 }
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370 if (inspector instanceof Lifecycle) {
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371 cb = new Lifecycle.BasicCallback();
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372 ((Lifecycle) inspector).start(totalWork, cb, cb);
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373 }
264
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374 // applyTime = inspectorTime = 0; // TIMING
242
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375 }
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376
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377 public void finish() {
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378 if (lastUserData != null) {
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379 lastUserData.done();
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380 lastUserData = null;
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381 }
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382 if (inspector instanceof Lifecycle) {
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383 ((Lifecycle) inspector).finish(cb);
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384 }
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385 daIndex.done();
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386 if (daData != null) {
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387 daData.done();
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388 }
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389 // System.out.printf("applyTime:%d ms, inspectorTime: %d ms\n", applyTime, inspectorTime); // TIMING
242
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390 }
263
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391
242
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392 public boolean range(int start, int end) throws IOException {
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393 byte[] nodeidBuf = new byte[20];
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394 int i;
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395 boolean extraReadsToBaseRev = false; // to indicate we read revision prior to start. XXX not sure can't do without
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396 // it (i.e. replace with i >= start)
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397 if (needData && (i = getBaseRevision(start)) < start) {
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398 // if lastRevisionRead in [baseRevision(start), start) can reuse lastUserData
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399 // doesn't make sense to reuse if lastRevisionRead == start (too much to change in the cycle below).
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400 if (lastRevisionRead != BAD_REVISION && i <= lastRevisionRead && lastRevisionRead < start) {
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401 i = lastRevisionRead + 1; // start with first not-yet-read revision
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402 extraReadsToBaseRev = i < start;
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403 } else {
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404 if (lastUserData != null) {
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405 lastUserData.done();
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406 lastUserData = null;
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407 }
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408 extraReadsToBaseRev = true;
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409 }
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410 } else {
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411 // don't need to clean lastUserData as it's always null when !needData
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412 i = start;
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413 }
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414
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415 daIndex.seek(getIndexOffsetInt(i));
258
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416 //
263
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417 // reuse some instances
258
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418 final ArrayList<PatchRecord> patches = new ArrayList<PatchRecord>();
263
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419 final Inflater inflater = new Inflater();
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420 // can share buffer between instances of InflaterDataAccess as I never read any two of them in parallel
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421 final byte[] inflaterBuffer = new byte[1024];
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422 //
242
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423
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424 for (; i <= end; i++ ) {
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425 if (inline && needData) {
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426 // inspector reading data (though FilterDataAccess) may have affected index position
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427 daIndex.seek(getIndexOffsetInt(i));
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428 }
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429 long l = daIndex.readLong(); // 0
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430 long offset = i == 0 ? 0 : (l >>> 16);
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431 @SuppressWarnings("unused")
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432 int flags = (int) (l & 0X0FFFF);
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433 int compressedLen = daIndex.readInt(); // +8
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434 int actualLen = daIndex.readInt(); // +12
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435 int baseRevision = daIndex.readInt(); // +16
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436 int linkRevision = daIndex.readInt(); // +20
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437 int parent1Revision = daIndex.readInt();
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438 int parent2Revision = daIndex.readInt();
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439 // Hg has 32 bytes here, uses 20 for nodeid, and keeps 12 last bytes empty
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440 daIndex.readBytes(nodeidBuf, 0, 20); // +32
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441 daIndex.skip(12);
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442 DataAccess userDataAccess = null;
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443 if (needData) {
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444 int streamOffset;
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445 DataAccess streamDataAccess;
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446 if (inline) {
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447 streamDataAccess = daIndex;
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448 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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449 } else {
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450 streamOffset = (int) offset;
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451 streamDataAccess = daData;
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452 daData.seek(streamOffset);
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453 }
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454 final boolean patchToPrevious = baseRevision != i; // the only way I found to tell if it's a patch
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455 if (streamDataAccess.isEmpty()) {
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456 userDataAccess = new DataAccess(); // empty
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457 } else {
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458 final byte firstByte = streamDataAccess.readByte();
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459 if (firstByte == 0x78 /* 'x' */) {
263
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460 inflater.reset();
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461 userDataAccess = new InflaterDataAccess(streamDataAccess, streamOffset, compressedLen, patchToPrevious ? -1 : actualLen, inflater, inflaterBuffer);
242
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462 } else if (firstByte == 0x75 /* 'u' */) {
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463 userDataAccess = new FilterDataAccess(streamDataAccess, streamOffset+1, compressedLen-1);
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464 } else {
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465 // XXX Python impl in fact throws exception when there's not 'x', 'u' or '0'
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466 // but I don't see reason not to return data as is
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467 userDataAccess = new FilterDataAccess(streamDataAccess, streamOffset, compressedLen);
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468 }
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469 }
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470 // XXX
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471 if (patchToPrevious) {
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472 // this is a patch
263
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473 patches.clear(); // won't hurt to ensure there are no leftovers, even if we already cleaned
242
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474 while (!userDataAccess.isEmpty()) {
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475 PatchRecord pr = PatchRecord.read(userDataAccess);
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476 // System.out.printf("PatchRecord:%d %d %d\n", pr.start, pr.end, pr.len);
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477 patches.add(pr);
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478 }
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479 userDataAccess.done();
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480 //
263
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481 // it shall be reset at the end of prev iteration, when it got assigned from userDataAccess
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482 // however, actual userDataAccess and lastUserData may share Inflater object, which needs to be reset
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483 // Alternatively, userDataAccess.done() above may be responsible to reset Inflater (if it's InflaterDataAccess)
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484 lastUserData.reset();
264
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485 // final long startMeasuring = System.currentTimeMillis(); // TIMING
242
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486 byte[] userData = apply(lastUserData, actualLen, patches);
264
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487 // applyTime += (System.currentTimeMillis() - startMeasuring); // TIMING
263
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488 patches.clear(); // do not keep any reference, allow PatchRecord to be gc'd
242
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489 userDataAccess = new ByteArrayDataAccess(userData);
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490 }
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491 } else {
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492 if (inline) {
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493 daIndex.skip(compressedLen);
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494 }
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495 }
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496 if (!extraReadsToBaseRev || i >= start) {
264
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497 // final long startMeasuring = System.currentTimeMillis(); // TIMING
242
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498 inspector.next(i, actualLen, baseRevision, linkRevision, parent1Revision, parent2Revision, nodeidBuf, userDataAccess);
264
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499 // inspectorTime += (System.currentTimeMillis() - startMeasuring); // TIMING
242
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500 }
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501 if (cb != null) {
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502 if (cb.isStopped()) {
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503 return false;
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504 }
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505 }
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506 if (userDataAccess != null) {
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507 userDataAccess.reset(); // not sure this is necessary here, as lastUserData would get reset anyway before next use.
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508 }
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509 if (lastUserData != null) {
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510 lastUserData.done();
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511 }
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512 lastUserData = userDataAccess;
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513 }
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514 lastRevisionRead = end;
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515 return true;
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516 }
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517 }
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518
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519
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520 // mpatch.c : apply()
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521 // FIXME need to implement patch merge (fold, combine, gather and discard from aforementioned mpatch.[c|py]), also see Revlog and Mercurial PDF
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522 public/*for HgBundle; until moved to better place*/static byte[] apply(DataAccess baseRevisionContent, int outcomeLen, List<PatchRecord> patch) throws IOException {
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diff changeset
523 int last = 0, destIndex = 0;
43
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524 if (outcomeLen == -1) {
158
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diff changeset
525 outcomeLen = baseRevisionContent.length();
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diff changeset
526 for (int i = 0, x = patch.size(); i < x; i++) {
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diff changeset
527 PatchRecord pr = patch.get(i);
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528 outcomeLen += pr.start - last + pr.len;
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529 last = pr.end;
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530 }
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531 outcomeLen -= last;
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532 last = 0;
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533 }
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534 byte[] rv = new byte[outcomeLen];
263
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535 for (int i = 0, x = patch.size(); i < x; i++) {
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diff changeset
536 PatchRecord pr = patch.get(i);
51
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537 baseRevisionContent.seek(last);
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diff changeset
538 baseRevisionContent.readBytes(rv, destIndex, pr.start-last);
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diff changeset
539 destIndex += pr.start - last;
43
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diff changeset
540 System.arraycopy(pr.data, 0, rv, destIndex, pr.data.length);
3
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diff changeset
541 destIndex += pr.data.length;
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542 last = pr.end;
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543 }
51
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544 baseRevisionContent.seek(last);
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545 baseRevisionContent.readBytes(rv, destIndex, (int) (baseRevisionContent.length() - last));
3
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546 return rv;
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547 }
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548
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diff changeset
549 // @see http://mercurial.selenic.com/wiki/BundleFormat, in Changelog group description
77
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diff changeset
550 public static class PatchRecord {
52
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diff changeset
551 /*
30bd38978846 brief explanation of patch record
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diff changeset
552 Given there are pr1 and pr2:
30bd38978846 brief explanation of patch record
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parents: 49
diff changeset
553 pr1.start to pr1.end will be replaced with pr's data (of pr1.len)
30bd38978846 brief explanation of patch record
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diff changeset
554 pr1.end to pr2.start gets copied from base
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555 */
77
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556 public int start, end, len;
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557 public byte[] data;
3
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558
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559 // TODO consider PatchRecord that only records data position (absolute in data source), and acquires data as needed
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diff changeset
560 private PatchRecord(int p1, int p2, int length, byte[] src) {
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diff changeset
561 start = p1;
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diff changeset
562 end = p2;
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diff changeset
563 len = length;
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parents: 35
diff changeset
564 data = src;
3
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diff changeset
565 }
36
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diff changeset
566
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diff changeset
567 /*package-local*/ static PatchRecord read(byte[] data, int offset) {
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parents: 35
diff changeset
568 final int x = offset; // shorthand
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parents: 35
diff changeset
569 int p1 = ((data[x] & 0xFF)<< 24) | ((data[x+1] & 0xFF) << 16) | ((data[x+2] & 0xFF) << 8) | (data[x+3] & 0xFF);
205f9b59b400 Strip parsing logic out from console frontend
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parents: 35
diff changeset
570 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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diff changeset
571 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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diff changeset
572 byte[] dataCopy = new byte[len];
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diff changeset
573 System.arraycopy(data, x+12, dataCopy, 0, len);
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parents: 35
diff changeset
574 return new PatchRecord(p1, p2, len, dataCopy);
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parents: 35
diff changeset
575 }
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diff changeset
576
77
c677e1593919 Moved RevlogStream implementation into .internal
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diff changeset
577 public /*for HgBundle*/ static PatchRecord read(DataAccess da) throws IOException {
36
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parents: 35
diff changeset
578 int p1 = da.readInt();
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diff changeset
579 int p2 = da.readInt();
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diff changeset
580 int len = da.readInt();
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parents: 35
diff changeset
581 byte[] src = new byte[len];
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parents: 35
diff changeset
582 da.readBytes(src, 0, len);
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 35
diff changeset
583 return new PatchRecord(p1, p2, len, src);
205f9b59b400 Strip parsing logic out from console frontend
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 35
diff changeset
584 }
77
c677e1593919 Moved RevlogStream implementation into .internal
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parents: 74
diff changeset
585 }
c677e1593919 Moved RevlogStream implementation into .internal
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 74
diff changeset
586
c677e1593919 Moved RevlogStream implementation into .internal
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 74
diff changeset
587 // 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
c677e1593919 Moved RevlogStream implementation into .internal
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 74
diff changeset
588 // instantly - e.g. calculate hash, or comparing two revisions
c677e1593919 Moved RevlogStream implementation into .internal
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 74
diff changeset
589 public interface Inspector {
c677e1593919 Moved RevlogStream implementation into .internal
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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diff changeset
590 // XXX boolean retVal to indicate whether to continue?
157
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
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 53 102
diff changeset
591 // TODO specify nodeid and data length, and reuse policy (i.e. if revlog stream doesn't reuse nodeid[] for each call)
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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parents: 53 102
diff changeset
592 // implementers shall not invoke DataAccess.done(), it's accomplished by #iterate at appropraite moment
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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parents: 53 102
diff changeset
593 void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[/*20*/] nodeid, DataAccess data);
3
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
594 }
0
dbd663faec1f Basic changelog parsing
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
595 }