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annotate src/org/tmatesoft/hg/internal/RevlogStream.java @ 288:b11f6a08f748

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Avoid boxing int values and list resizes on revlog read
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Sat, 10 Sep 2011 00:18:39 +0200
parents 35125450c804
children 981f9f50bb6c
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.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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64
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65 /*package*/ DataAccess getIndexStream() {
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66 // XXX may supply a hint that I'll need really few bytes of data (perhaps, at some offset)
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67 // to avoid mmap files when only few bytes are to be read (i.e. #dataLength())
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68 return dataAccess.create(indexFile);
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69 }
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71 /*package*/ DataAccess getDataStream() {
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72 final String indexName = indexFile.getName();
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73 File dataFile = new File(indexFile.getParentFile(), indexName.substring(0, indexName.length() - 1) + "d");
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74 return dataAccess.create(dataFile);
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75 }
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76
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77 public int revisionCount() {
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78 initOutline();
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79 return baseRevisions.length;
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80 }
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81
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82 public int dataLength(int revision) {
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83 // XXX in fact, use of iterate() instead of this implementation may be quite reasonable.
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84 //
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85 final int indexSize = revisionCount();
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86 DataAccess daIndex = getIndexStream();
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87 if (revision == TIP) {
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88 revision = indexSize - 1;
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89 }
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90 try {
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91 int recordOffset = getIndexOffsetInt(revision);
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92 daIndex.seek(recordOffset + 12); // 6+2+4
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93 int actualLen = daIndex.readInt();
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94 return actualLen;
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95 } catch (IOException ex) {
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96 ex.printStackTrace(); // log error. FIXME better handling
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97 throw new IllegalStateException(ex);
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98 } finally {
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99 daIndex.done();
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100 }
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101 }
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102
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103 public byte[] nodeid(int revision) {
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104 final int indexSize = revisionCount();
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105 if (revision == TIP) {
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106 revision = indexSize - 1;
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107 }
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108 if (revision < 0 || revision >= indexSize) {
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109 throw new IllegalArgumentException(Integer.toString(revision));
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110 }
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111 DataAccess daIndex = getIndexStream();
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112 try {
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113 int recordOffset = getIndexOffsetInt(revision);
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114 daIndex.seek(recordOffset + 32);
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115 byte[] rv = new byte[20];
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116 daIndex.readBytes(rv, 0, 20);
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117 return rv;
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118 } catch (IOException ex) {
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119 ex.printStackTrace();
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120 throw new IllegalStateException();
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121 } finally {
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122 daIndex.done();
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123 }
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124 }
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125
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126 public int linkRevision(int revision) {
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127 final int last = revisionCount() - 1;
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128 if (revision == TIP) {
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129 revision = last;
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130 }
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131 if (revision < 0 || revision > last) {
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132 throw new IllegalArgumentException(Integer.toString(revision));
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133 }
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134 DataAccess daIndex = getIndexStream();
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135 try {
198
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136 int recordOffset = getIndexOffsetInt(revision);
88
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137 daIndex.seek(recordOffset + 20);
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138 int linkRev = daIndex.readInt();
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139 return linkRev;
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140 } catch (IOException ex) {
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141 ex.printStackTrace();
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142 throw new IllegalStateException();
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143 } finally {
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144 daIndex.done();
80
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145 }
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146 }
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147
49
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148 // Perhaps, RevlogStream should be limited to use of plain int revisions for access,
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149 // while Nodeids should be kept on the level up, in Revlog. Guess, Revlog better keep
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150 // map of nodeids, and once this comes true, we may get rid of this method.
80
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151 // Unlike its counterpart, {@link Revlog#getLocalRevisionNumber()}, doesn't fail with exception if node not found,
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152 /**
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153 * @return integer in [0..revisionCount()) or {@link HgRepository#BAD_REVISION} if not found
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154 */
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155 public int findLocalRevisionNumber(Nodeid nodeid) {
22
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156 // XXX this one may be implemented with iterate() once there's mechanism to stop iterations
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157 final int indexSize = revisionCount();
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158 DataAccess daIndex = getIndexStream();
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159 try {
24
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160 byte[] nodeidBuf = new byte[20];
22
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161 for (int i = 0; i < indexSize; i++) {
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162 daIndex.skip(8);
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163 int compressedLen = daIndex.readInt();
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164 daIndex.skip(20);
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165 daIndex.readBytes(nodeidBuf, 0, 20);
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166 if (nodeid.equalsTo(nodeidBuf)) {
22
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167 return i;
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168 }
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169 daIndex.skip(inline ? 12 + compressedLen : 12);
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170 }
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171 } catch (IOException ex) {
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172 ex.printStackTrace(); // log error. FIXME better handling. Perhaps, shall return BAD_REVISION here as well?
22
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173 throw new IllegalStateException(ex);
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174 } finally {
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175 daIndex.done();
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176 }
80
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177 return BAD_REVISION;
22
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178 }
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179
2
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180
9
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181 private final int REVLOGV1_RECORD_SIZE = 64;
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182
3
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183 // should be possible to use TIP, ALL, or -1, -2, -n notation of Hg
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184 // ? boolean needsNodeid
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185 public void iterate(int start, int end, boolean needData, Inspector inspector) {
2
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186 initOutline();
198
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187 final int indexSize = revisionCount();
3
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188 if (indexSize == 0) {
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189 return;
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190 }
5
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191 if (end == TIP) {
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192 end = indexSize - 1;
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193 }
5
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194 if (start == TIP) {
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195 start = indexSize - 1;
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196 }
2
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197 if (start < 0 || start >= indexSize) {
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
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diff changeset
198 throw new IllegalArgumentException(String.format("Bad left range boundary %d in [0..%d]", start, indexSize-1));
2
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199 }
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diff changeset
200 if (end < start || end >= indexSize) {
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
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diff changeset
201 throw new IllegalArgumentException(String.format("Bad right range boundary %d in [0..%d]", end, indexSize-1));
2
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diff changeset
202 }
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diff changeset
203 // XXX may cache [start .. end] from index with a single read (pre-read)
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diff changeset
204
242
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diff changeset
205 ReaderN1 r = new ReaderN1(needData, inspector);
2
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diff changeset
206 try {
242
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diff changeset
207 r.start(end - start + 1);
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diff changeset
208 r.range(start, end);
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diff changeset
209 } catch (IOException ex) {
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diff changeset
210 throw new HgBadStateException(ex); // FIXME need better handling
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diff changeset
211 } finally {
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diff changeset
212 r.finish();
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diff changeset
213 }
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diff changeset
214 }
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diff changeset
215
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diff changeset
216 /**
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diff changeset
217 * Effective alternative to {@link #iterate(int, int, boolean, Inspector) batch read}, when only few selected
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diff changeset
218 * revisions are of interest.
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diff changeset
219 * @param sortedRevisions revisions to walk, in ascending order.
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diff changeset
220 * @param needData whether inspector needs access to header only
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diff changeset
221 * @param inspector callback to process entries
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diff changeset
222 */
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diff changeset
223 public void iterate(int[] sortedRevisions, boolean needData, Inspector inspector) {
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diff changeset
224 final int indexSize = revisionCount();
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diff changeset
225 if (indexSize == 0 || sortedRevisions.length == 0) {
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diff changeset
226 return;
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diff changeset
227 }
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diff changeset
228 if (sortedRevisions[0] > indexSize || sortedRevisions[sortedRevisions.length - 1] > indexSize) {
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diff changeset
229 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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diff changeset
230 }
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diff changeset
231
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diff changeset
232 ReaderN1 r = new ReaderN1(needData, inspector);
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diff changeset
233 try {
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diff changeset
234 r.start(sortedRevisions.length);
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diff changeset
235 for (int i = 0; i < sortedRevisions.length; ) {
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diff changeset
236 int x = i;
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diff changeset
237 i++;
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diff changeset
238 while (i < sortedRevisions.length) {
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diff changeset
239 if (sortedRevisions[i] == sortedRevisions[i-1] + 1) {
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diff changeset
240 i++;
2
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diff changeset
241 } else {
217
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 break;
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diff changeset
243 }
e39cf474ef94 Experimental support to mix-in start and end events for inspectors. Additionally, Lifecycle may serve as iteration control
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diff changeset
244 }
242
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diff changeset
245 // commitRevisions[x..i-1] are sequential
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diff changeset
246 if (!r.range(sortedRevisions[x], sortedRevisions[i-1])) {
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diff changeset
247 return;
51
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
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diff changeset
248 }
2
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diff changeset
249 }
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diff changeset
250 } 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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diff changeset
251 throw new HgBadStateException(ex); // FIXME need better handling
3
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diff changeset
252 } finally {
242
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diff changeset
253 r.finish();
2
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254 }
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255 }
198
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256
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257 private int getBaseRevision(int revision) {
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258 return baseRevisions[revision];
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259 }
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260
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261 /**
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262 * @return offset of the revision's record in the index (.i) stream
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263 */
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264 private int getIndexOffsetInt(int revision) {
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265 return inline ? indexRecordOffset[revision] : revision * REVLOGV1_RECORD_SIZE;
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266 }
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267
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268 private void initOutline() {
198
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269 if (baseRevisions != null && baseRevisions.length > 0) {
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270 return;
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271 }
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272 DataAccess da = getIndexStream();
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273 try {
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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;
288
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283 IntVector resBases, resOffsets = null;
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284 int entryCountGuess = da.length() / REVLOGV1_RECORD_SIZE;
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285 if (inline) {
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286 entryCountGuess >>>= 2; // pure guess, assume useful data takes 3/4 of total space
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287 resOffsets = new IntVector(entryCountGuess, 5000);
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288 }
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289 resBases = new IntVector(entryCountGuess, 5000);
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290
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291 long offset = 0; // first offset is always 0, thus Hg uses it for other purposes
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292 while(true) {
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293 int compressedLen = da.readInt();
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294 // 8+4 = 12 bytes total read here
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295 @SuppressWarnings("unused")
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296 int actualLen = da.readInt();
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297 int baseRevision = da.readInt();
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298 // 12 + 8 = 20 bytes read here
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299 // int linkRevision = di.readInt();
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300 // int parent1Revision = di.readInt();
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301 // int parent2Revision = di.readInt();
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302 // byte[] nodeid = new byte[32];
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303 resBases.add(baseRevision);
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304 if (inline) {
198
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305 int o = (int) offset;
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306 if (o != offset) {
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307 // just in case, can't happen, ever, unless HG (or some other bad tool) produces index file
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308 // with inlined data of size greater than 2 Gb.
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309 throw new HgBadStateException("Data too big, offset didn't fit to sizeof(int)");
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310 }
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311 resOffsets.add(o + REVLOGV1_RECORD_SIZE * resOffsets.size());
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312 da.skip(3*4 + 32 + compressedLen); // Check: 44 (skip) + 20 (read) = 64 (total RevlogNG record size)
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313 } else {
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314 da.skip(3*4 + 32);
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315 }
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316 if (da.isEmpty()) {
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317 // fine, done then
288
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318 baseRevisions = resBases.toArray(true);
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319 if (inline) {
288
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320 indexRecordOffset = resOffsets.toArray(true);
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321 }
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322 break;
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323 } else {
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324 // start reading next record
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325 long l = da.readLong();
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326 offset = l >>> 16;
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327 }
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328 }
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329 } catch (IOException ex) {
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330 ex.printStackTrace(); // log error
198
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331 // too bad, no outline then, but don't fail with NPE
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332 baseRevisions = new int[0];
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333 } finally {
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334 da.done();
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335 }
3
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336 }
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337
242
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338 /**
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339 * operation with single file open/close and multiple diverse reads.
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340 * XXX initOutline might need similar extraction to keen N1 format knowledge
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341 */
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342 class ReaderN1 {
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343 private final Inspector inspector;
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344 private final boolean needData;
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345 private DataAccess daIndex = null, daData = null;
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346 private Lifecycle.BasicCallback cb = null;
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347 private int lastRevisionRead = BAD_REVISION;
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348 private DataAccess lastUserData;
263
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349 // next are to track two major bottlenecks - patch application and actual time spent in inspector
264
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350 // private long applyTime, inspectorTime; // TIMING
263
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351
242
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352
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353 public ReaderN1(boolean needData, Inspector insp) {
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354 assert insp != null;
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355 this.needData = needData;
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356 inspector = insp;
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357 }
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358
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359 public void start(int totalWork) {
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360 daIndex = getIndexStream();
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361 if (needData && !inline) {
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362 daData = getDataStream();
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363 }
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364 if (inspector instanceof Lifecycle) {
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365 cb = new Lifecycle.BasicCallback();
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366 ((Lifecycle) inspector).start(totalWork, cb, cb);
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367 }
264
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368 // applyTime = inspectorTime = 0; // TIMING
242
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369 }
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370
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371 public void finish() {
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372 if (lastUserData != null) {
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373 lastUserData.done();
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374 lastUserData = null;
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375 }
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376 if (inspector instanceof Lifecycle) {
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377 ((Lifecycle) inspector).finish(cb);
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378 }
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379 daIndex.done();
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380 if (daData != null) {
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381 daData.done();
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382 }
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383 // System.out.printf("applyTime:%d ms, inspectorTime: %d ms\n", applyTime, inspectorTime); // TIMING
242
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384 }
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385
242
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386 public boolean range(int start, int end) throws IOException {
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387 byte[] nodeidBuf = new byte[20];
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388 int i;
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389 boolean extraReadsToBaseRev = false; // to indicate we read revision prior to start. XXX not sure can't do without
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390 // it (i.e. replace with i >= start)
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391 if (needData && (i = getBaseRevision(start)) < start) {
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392 // if lastRevisionRead in [baseRevision(start), start) can reuse lastUserData
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393 // doesn't make sense to reuse if lastRevisionRead == start (too much to change in the cycle below).
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394 if (lastRevisionRead != BAD_REVISION && i <= lastRevisionRead && lastRevisionRead < start) {
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395 i = lastRevisionRead + 1; // start with first not-yet-read revision
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396 extraReadsToBaseRev = i < start;
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397 } else {
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398 if (lastUserData != null) {
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399 lastUserData.done();
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400 lastUserData = null;
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401 }
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402 extraReadsToBaseRev = true;
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403 }
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404 } else {
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405 // don't need to clean lastUserData as it's always null when !needData
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406 i = start;
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407 }
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408
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409 daIndex.seek(getIndexOffsetInt(i));
258
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410 //
263
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411 // reuse some instances
258
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412 final ArrayList<PatchRecord> patches = new ArrayList<PatchRecord>();
263
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413 final Inflater inflater = new Inflater();
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414 // can share buffer between instances of InflaterDataAccess as I never read any two of them in parallel
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415 final byte[] inflaterBuffer = new byte[1024];
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416 //
242
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417
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418 for (; i <= end; i++ ) {
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419 if (inline && needData) {
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420 // inspector reading data (though FilterDataAccess) may have affected index position
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421 daIndex.seek(getIndexOffsetInt(i));
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422 }
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423 long l = daIndex.readLong(); // 0
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424 long offset = i == 0 ? 0 : (l >>> 16);
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425 @SuppressWarnings("unused")
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426 int flags = (int) (l & 0X0FFFF);
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427 int compressedLen = daIndex.readInt(); // +8
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428 int actualLen = daIndex.readInt(); // +12
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429 int baseRevision = daIndex.readInt(); // +16
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430 int linkRevision = daIndex.readInt(); // +20
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431 int parent1Revision = daIndex.readInt();
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432 int parent2Revision = daIndex.readInt();
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433 // Hg has 32 bytes here, uses 20 for nodeid, and keeps 12 last bytes empty
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434 daIndex.readBytes(nodeidBuf, 0, 20); // +32
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435 daIndex.skip(12);
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436 DataAccess userDataAccess = null;
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437 if (needData) {
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438 int streamOffset;
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439 DataAccess streamDataAccess;
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440 if (inline) {
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441 streamDataAccess = daIndex;
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442 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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443 } else {
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444 streamOffset = (int) offset;
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445 streamDataAccess = daData;
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446 daData.seek(streamOffset);
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447 }
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448 final boolean patchToPrevious = baseRevision != i; // the only way I found to tell if it's a patch
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449 if (streamDataAccess.isEmpty()) {
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450 userDataAccess = new DataAccess(); // empty
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451 } else {
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452 final byte firstByte = streamDataAccess.readByte();
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453 if (firstByte == 0x78 /* 'x' */) {
263
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454 inflater.reset();
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455 userDataAccess = new InflaterDataAccess(streamDataAccess, streamOffset, compressedLen, patchToPrevious ? -1 : actualLen, inflater, inflaterBuffer);
242
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456 } else if (firstByte == 0x75 /* 'u' */) {
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457 userDataAccess = new FilterDataAccess(streamDataAccess, streamOffset+1, compressedLen-1);
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458 } else {
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459 // XXX Python impl in fact throws exception when there's not 'x', 'u' or '0'
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460 // but I don't see reason not to return data as is
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461 userDataAccess = new FilterDataAccess(streamDataAccess, streamOffset, compressedLen);
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462 }
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463 }
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464 // XXX
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465 if (patchToPrevious) {
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466 // this is a patch
263
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467 patches.clear(); // won't hurt to ensure there are no leftovers, even if we already cleaned
242
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468 while (!userDataAccess.isEmpty()) {
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469 PatchRecord pr = PatchRecord.read(userDataAccess);
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470 // System.out.printf("PatchRecord:%d %d %d\n", pr.start, pr.end, pr.len);
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471 patches.add(pr);
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472 }
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473 userDataAccess.done();
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474 //
263
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475 // it shall be reset at the end of prev iteration, when it got assigned from userDataAccess
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476 // however, actual userDataAccess and lastUserData may share Inflater object, which needs to be reset
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477 // Alternatively, userDataAccess.done() above may be responsible to reset Inflater (if it's InflaterDataAccess)
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478 lastUserData.reset();
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479 // final long startMeasuring = System.currentTimeMillis(); // TIMING
242
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480 byte[] userData = apply(lastUserData, actualLen, patches);
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481 // applyTime += (System.currentTimeMillis() - startMeasuring); // TIMING
263
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482 patches.clear(); // do not keep any reference, allow PatchRecord to be gc'd
242
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483 userDataAccess = new ByteArrayDataAccess(userData);
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484 }
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485 } else {
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486 if (inline) {
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487 daIndex.skip(compressedLen);
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488 }
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489 }
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490 if (!extraReadsToBaseRev || i >= start) {
264
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491 // final long startMeasuring = System.currentTimeMillis(); // TIMING
242
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492 inspector.next(i, actualLen, baseRevision, linkRevision, parent1Revision, parent2Revision, nodeidBuf, userDataAccess);
264
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493 // inspectorTime += (System.currentTimeMillis() - startMeasuring); // TIMING
242
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494 }
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495 if (cb != null) {
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496 if (cb.isStopped()) {
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497 return false;
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498 }
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499 }
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500 if (userDataAccess != null) {
263
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501 userDataAccess.reset(); // not sure this is necessary here, as lastUserData would get reset anyway before next use.
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502 }
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503 if (lastUserData != null) {
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504 lastUserData.done();
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505 }
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506 lastUserData = userDataAccess;
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507 }
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508 lastRevisionRead = end;
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509 return true;
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510 }
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511 }
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512
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513
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514 private static int[] toArray(List<Integer> l) {
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515 int[] rv = new int[l.size()];
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516 for (int i = 0; i < rv.length; i++) {
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517 rv[i] = l.get(i);
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518 }
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519 return rv;
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520 }
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521
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522
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523 // mpatch.c : apply()
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524 // 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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525 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
526 int last = 0, destIndex = 0;
43
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527 if (outcomeLen == -1) {
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528 outcomeLen = baseRevisionContent.length();
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diff changeset
529 for (int i = 0, x = patch.size(); i < x; i++) {
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530 PatchRecord pr = patch.get(i);
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531 outcomeLen += pr.start - last + pr.len;
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532 last = pr.end;
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533 }
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534 outcomeLen -= last;
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535 last = 0;
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536 }
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537 byte[] rv = new byte[outcomeLen];
263
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diff changeset
538 for (int i = 0, x = patch.size(); i < x; i++) {
31f67be94e71 RevlogStream - reduce number of object instances, reuse when possible
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diff changeset
539 PatchRecord pr = patch.get(i);
51
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540 baseRevisionContent.seek(last);
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diff changeset
541 baseRevisionContent.readBytes(rv, destIndex, pr.start-last);
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diff changeset
542 destIndex += pr.start - last;
43
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diff changeset
543 System.arraycopy(pr.data, 0, rv, destIndex, pr.data.length);
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diff changeset
544 destIndex += pr.data.length;
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545 last = pr.end;
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546 }
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diff changeset
547 baseRevisionContent.seek(last);
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diff changeset
548 baseRevisionContent.readBytes(rv, destIndex, (int) (baseRevisionContent.length() - last));
3
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549 return rv;
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550 }
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diff changeset
551
35
6061aa826a9e Complete parsing of the bundle format
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552 // @see http://mercurial.selenic.com/wiki/BundleFormat, in Changelog group description
77
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diff changeset
553 public static class PatchRecord {
52
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554 /*
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555 Given there are pr1 and pr2:
30bd38978846 brief explanation of patch record
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diff changeset
556 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
557 pr1.end to pr2.start gets copied from base
30bd38978846 brief explanation of patch record
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diff changeset
558 */
77
c677e1593919 Moved RevlogStream implementation into .internal
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diff changeset
559 public int start, end, len;
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diff changeset
560 public byte[] data;
3
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diff changeset
561
36
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diff changeset
562 // TODO consider PatchRecord that only records data position (absolute in data source), and acquires data as needed
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diff changeset
563 private PatchRecord(int p1, int p2, int length, byte[] src) {
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diff changeset
564 start = p1;
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diff changeset
565 end = p2;
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diff changeset
566 len = length;
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diff changeset
567 data = src;
3
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parents: 2
diff changeset
568 }
36
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diff changeset
569
205f9b59b400 Strip parsing logic out from console frontend
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diff changeset
570 /*package-local*/ static PatchRecord read(byte[] data, int offset) {
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parents: 35
diff changeset
571 final int x = offset; // shorthand
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parents: 35
diff changeset
572 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
573 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
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diff changeset
574 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
575 byte[] dataCopy = new byte[len];
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diff changeset
576 System.arraycopy(data, x+12, dataCopy, 0, len);
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parents: 35
diff changeset
577 return new PatchRecord(p1, p2, len, dataCopy);
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parents: 35
diff changeset
578 }
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diff changeset
579
77
c677e1593919 Moved RevlogStream implementation into .internal
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diff changeset
580 public /*for HgBundle*/ static PatchRecord read(DataAccess da) throws IOException {
36
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parents: 35
diff changeset
581 int p1 = da.readInt();
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diff changeset
582 int p2 = da.readInt();
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 35
diff changeset
583 int len = da.readInt();
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 35
diff changeset
584 byte[] src = new byte[len];
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 35
diff changeset
585 da.readBytes(src, 0, len);
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 35
diff changeset
586 return new PatchRecord(p1, p2, len, src);
205f9b59b400 Strip parsing logic out from console frontend
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parents: 35
diff changeset
587 }
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c677e1593919 Moved RevlogStream implementation into .internal
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 74
diff changeset
588 }
c677e1593919 Moved RevlogStream implementation into .internal
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 74
diff changeset
589
c677e1593919 Moved RevlogStream implementation into .internal
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 74
diff changeset
590 // 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>
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diff changeset
591 // instantly - e.g. calculate hash, or comparing two revisions
c677e1593919 Moved RevlogStream implementation into .internal
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parents: 74
diff changeset
592 public interface Inspector {
c677e1593919 Moved RevlogStream implementation into .internal
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diff changeset
593 // 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
594 // 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
595 // 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
596 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
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parents: 2
diff changeset
597 }
0
dbd663faec1f Basic changelog parsing
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
598 }