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annotate src/org/tmatesoft/hg/internal/RevlogStream.java @ 263:31f67be94e71

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RevlogStream - reduce number of object instances, reuse when possible
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 18 Aug 2011 18:06:44 +0200
parents e5776067b3b8
children 6bb5e7ed051a
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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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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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.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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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. Perhaps, shall return BAD_REVISION here as well?
22
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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 }
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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 }
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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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diff changeset
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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198 if (end < start || end >= indexSize) {
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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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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) {
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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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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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diff changeset
233 for (int i = 0; i < sortedRevisions.length; ) {
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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;
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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
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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
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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 }
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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;
263
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341 // next are to track two major bottlenecks - patch application and actual time spent in inspector
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342 // private long applyTime, inspectorTime;
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343
242
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344
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345 public ReaderN1(boolean needData, Inspector insp) {
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346 assert insp != null;
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347 this.needData = needData;
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348 inspector = insp;
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349 }
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350
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351 public void start(int totalWork) {
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352 daIndex = getIndexStream();
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353 if (needData && !inline) {
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354 daData = getDataStream();
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355 }
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356 if (inspector instanceof Lifecycle) {
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357 cb = new Lifecycle.BasicCallback();
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358 ((Lifecycle) inspector).start(totalWork, cb, cb);
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359 }
263
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360 // applyTime = inspectorTime = 0;
242
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361 }
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362
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363 public void finish() {
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364 if (lastUserData != null) {
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365 lastUserData.done();
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366 lastUserData = null;
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367 }
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368 if (inspector instanceof Lifecycle) {
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369 ((Lifecycle) inspector).finish(cb);
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370 }
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371 daIndex.done();
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372 if (daData != null) {
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373 daData.done();
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374 }
263
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375 // System.out.printf("applyTime:%d ms, inspectorTime: %d ms\n", applyTime, inspectorTime);
242
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376 }
263
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377
242
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378 public boolean range(int start, int end) throws IOException {
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379 byte[] nodeidBuf = new byte[20];
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380 int i;
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381 boolean extraReadsToBaseRev = false; // to indicate we read revision prior to start. XXX not sure can't do without
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382 // it (i.e. replace with i >= start)
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383 if (needData && (i = getBaseRevision(start)) < start) {
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384 // if lastRevisionRead in [baseRevision(start), start) can reuse lastUserData
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385 // doesn't make sense to reuse if lastRevisionRead == start (too much to change in the cycle below).
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386 if (lastRevisionRead != BAD_REVISION && i <= lastRevisionRead && lastRevisionRead < start) {
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387 i = lastRevisionRead + 1; // start with first not-yet-read revision
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388 extraReadsToBaseRev = i < start;
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389 } else {
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390 if (lastUserData != null) {
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391 lastUserData.done();
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392 lastUserData = null;
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393 }
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394 extraReadsToBaseRev = true;
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395 }
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396 } else {
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397 // don't need to clean lastUserData as it's always null when !needData
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398 i = start;
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399 }
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400
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401 daIndex.seek(getIndexOffsetInt(i));
258
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402 //
263
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403 // reuse some instances
258
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404 final ArrayList<PatchRecord> patches = new ArrayList<PatchRecord>();
263
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405 final Inflater inflater = new Inflater();
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406 // can share buffer between instances of InflaterDataAccess as I never read any two of them in parallel
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407 final byte[] inflaterBuffer = new byte[1024];
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408 //
242
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409
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410 for (; i <= end; i++ ) {
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411 if (inline && needData) {
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412 // inspector reading data (though FilterDataAccess) may have affected index position
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413 daIndex.seek(getIndexOffsetInt(i));
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414 }
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415 long l = daIndex.readLong(); // 0
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416 long offset = i == 0 ? 0 : (l >>> 16);
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417 @SuppressWarnings("unused")
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418 int flags = (int) (l & 0X0FFFF);
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419 int compressedLen = daIndex.readInt(); // +8
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420 int actualLen = daIndex.readInt(); // +12
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421 int baseRevision = daIndex.readInt(); // +16
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422 int linkRevision = daIndex.readInt(); // +20
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423 int parent1Revision = daIndex.readInt();
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424 int parent2Revision = daIndex.readInt();
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425 // Hg has 32 bytes here, uses 20 for nodeid, and keeps 12 last bytes empty
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426 daIndex.readBytes(nodeidBuf, 0, 20); // +32
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427 daIndex.skip(12);
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428 DataAccess userDataAccess = null;
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429 if (needData) {
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430 int streamOffset;
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431 DataAccess streamDataAccess;
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432 if (inline) {
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433 streamDataAccess = daIndex;
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434 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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435 } else {
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436 streamOffset = (int) offset;
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437 streamDataAccess = daData;
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438 daData.seek(streamOffset);
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439 }
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440 final boolean patchToPrevious = baseRevision != i; // the only way I found to tell if it's a patch
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441 if (streamDataAccess.isEmpty()) {
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442 userDataAccess = new DataAccess(); // empty
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443 } else {
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444 final byte firstByte = streamDataAccess.readByte();
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445 if (firstByte == 0x78 /* 'x' */) {
263
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446 inflater.reset();
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447 userDataAccess = new InflaterDataAccess(streamDataAccess, streamOffset, compressedLen, patchToPrevious ? -1 : actualLen, inflater, inflaterBuffer);
242
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448 } else if (firstByte == 0x75 /* 'u' */) {
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449 userDataAccess = new FilterDataAccess(streamDataAccess, streamOffset+1, compressedLen-1);
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450 } else {
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451 // XXX Python impl in fact throws exception when there's not 'x', 'u' or '0'
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452 // but I don't see reason not to return data as is
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453 userDataAccess = new FilterDataAccess(streamDataAccess, streamOffset, compressedLen);
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454 }
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455 }
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456 // XXX
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457 if (patchToPrevious) {
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458 // this is a patch
263
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459 patches.clear(); // won't hurt to ensure there are no leftovers, even if we already cleaned
242
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460 while (!userDataAccess.isEmpty()) {
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461 PatchRecord pr = PatchRecord.read(userDataAccess);
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462 // System.out.printf("PatchRecord:%d %d %d\n", pr.start, pr.end, pr.len);
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463 patches.add(pr);
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464 }
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465 userDataAccess.done();
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466 //
263
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467 // it shall be reset at the end of prev iteration, when it got assigned from userDataAccess
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468 // however, actual userDataAccess and lastUserData may share Inflater object, which needs to be reset
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469 // Alternatively, userDataAccess.done() above may be responsible to reset Inflater (if it's InflaterDataAccess)
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470 lastUserData.reset();
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471 // final long startMeasuring = System.currentTimeMillis();
242
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472 byte[] userData = apply(lastUserData, actualLen, patches);
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473 // applyTime += (System.currentTimeMillis() - startMeasuring);
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474 patches.clear(); // do not keep any reference, allow PatchRecord to be gc'd
242
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475 userDataAccess = new ByteArrayDataAccess(userData);
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476 }
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477 } else {
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478 if (inline) {
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479 daIndex.skip(compressedLen);
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480 }
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481 }
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482 if (!extraReadsToBaseRev || i >= start) {
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483 // final long startMeasuring = System.currentTimeMillis();
242
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484 inspector.next(i, actualLen, baseRevision, linkRevision, parent1Revision, parent2Revision, nodeidBuf, userDataAccess);
263
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485 // inspectorTime += (System.currentTimeMillis() - startMeasuring);
242
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486 }
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487 if (cb != null) {
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488 if (cb.isStopped()) {
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489 return false;
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490 }
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491 }
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492 if (userDataAccess != null) {
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493 userDataAccess.reset(); // not sure this is necessary here, as lastUserData would get reset anyway before next use.
242
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494 }
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495 if (lastUserData != null) {
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496 lastUserData.done();
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497 }
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498 lastUserData = userDataAccess;
242
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499 }
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500 lastRevisionRead = end;
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501 return true;
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502 }
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503 }
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504
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505
198
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506 private static int[] toArray(List<Integer> l) {
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507 int[] rv = new int[l.size()];
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508 for (int i = 0; i < rv.length; i++) {
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509 rv[i] = l.get(i);
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510 }
198
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511 return rv;
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512 }
198
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513
3
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514
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515 // mpatch.c : apply()
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516 // 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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diff changeset
517 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
518 int last = 0, destIndex = 0;
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519 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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520 outcomeLen = baseRevisionContent.length();
263
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diff changeset
521 for (int i = 0, x = patch.size(); i < x; i++) {
31f67be94e71 RevlogStream - reduce number of object instances, reuse when possible
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522 PatchRecord pr = patch.get(i);
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523 outcomeLen += pr.start - last + pr.len;
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524 last = pr.end;
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525 }
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526 outcomeLen -= last;
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527 last = 0;
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528 }
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diff changeset
529 byte[] rv = new byte[outcomeLen];
263
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530 for (int i = 0, x = patch.size(); i < x; i++) {
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parents: 258
diff changeset
531 PatchRecord pr = patch.get(i);
51
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532 baseRevisionContent.seek(last);
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diff changeset
533 baseRevisionContent.readBytes(rv, destIndex, pr.start-last);
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534 destIndex += pr.start - last;
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diff changeset
535 System.arraycopy(pr.data, 0, rv, destIndex, pr.data.length);
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536 destIndex += pr.data.length;
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537 last = pr.end;
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538 }
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539 baseRevisionContent.seek(last);
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540 baseRevisionContent.readBytes(rv, destIndex, (int) (baseRevisionContent.length() - last));
3
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diff changeset
541 return rv;
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542 }
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543
35
6061aa826a9e Complete parsing of the bundle format
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diff changeset
544 // @see http://mercurial.selenic.com/wiki/BundleFormat, in Changelog group description
77
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parents: 74
diff changeset
545 public static class PatchRecord {
52
30bd38978846 brief explanation of patch record
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546 /*
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diff changeset
547 Given there are pr1 and pr2:
30bd38978846 brief explanation of patch record
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diff changeset
548 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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parents: 49
diff changeset
549 pr1.end to pr2.start gets copied from base
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550 */
77
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diff changeset
551 public int start, end, len;
c677e1593919 Moved RevlogStream implementation into .internal
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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diff changeset
552 public byte[] data;
3
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diff changeset
553
36
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parents: 35
diff changeset
554 // TODO consider PatchRecord that only records data position (absolute in data source), and acquires data as needed
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parents: 35
diff changeset
555 private PatchRecord(int p1, int p2, int length, byte[] src) {
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diff changeset
556 start = p1;
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diff changeset
557 end = p2;
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diff changeset
558 len = length;
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diff changeset
559 data = src;
3
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diff changeset
560 }
36
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diff changeset
561
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diff changeset
562 /*package-local*/ static PatchRecord read(byte[] data, int offset) {
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diff changeset
563 final int x = offset; // shorthand
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parents: 35
diff changeset
564 int p1 = ((data[x] & 0xFF)<< 24) | ((data[x+1] & 0xFF) << 16) | ((data[x+2] & 0xFF) << 8) | (data[x+3] & 0xFF);
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parents: 35
diff changeset
565 int p2 = ((data[x+4] & 0xFF) << 24) | ((data[x+5] & 0xFF) << 16) | ((data[x+6] & 0xFF) << 8) | (data[x+7] & 0xFF);
205f9b59b400 Strip parsing logic out from console frontend
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 35
diff changeset
566 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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parents: 35
diff changeset
567 byte[] dataCopy = new byte[len];
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parents: 35
diff changeset
568 System.arraycopy(data, x+12, dataCopy, 0, len);
205f9b59b400 Strip parsing logic out from console frontend
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 35
diff changeset
569 return new PatchRecord(p1, p2, len, dataCopy);
205f9b59b400 Strip parsing logic out from console frontend
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 35
diff changeset
570 }
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parents: 35
diff changeset
571
77
c677e1593919 Moved RevlogStream implementation into .internal
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diff changeset
572 public /*for HgBundle*/ static PatchRecord read(DataAccess da) throws IOException {
36
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diff changeset
573 int p1 = da.readInt();
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diff changeset
574 int p2 = da.readInt();
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diff changeset
575 int len = da.readInt();
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parents: 35
diff changeset
576 byte[] src = new byte[len];
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parents: 35
diff changeset
577 da.readBytes(src, 0, len);
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diff changeset
578 return new PatchRecord(p1, p2, len, src);
205f9b59b400 Strip parsing logic out from console frontend
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diff changeset
579 }
77
c677e1593919 Moved RevlogStream implementation into .internal
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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diff changeset
580 }
c677e1593919 Moved RevlogStream implementation into .internal
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 74
diff changeset
581
c677e1593919 Moved RevlogStream implementation into .internal
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 74
diff changeset
582 // 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
583 // 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
584 public interface Inspector {
c677e1593919 Moved RevlogStream implementation into .internal
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 74
diff changeset
585 // 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
586 // 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
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 53 102
diff changeset
587 // 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
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 53 102
diff changeset
588 void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[/*20*/] nodeid, DataAccess data);
3
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
589 }
0
dbd663faec1f Basic changelog parsing
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
590 }