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annotate src/org/tmatesoft/hg/internal/RevlogStream.java @ 295:981f9f50bb6c

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Issue 11: Error log facility. SessionContext to share common facilities
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 16 Sep 2011 05:35:32 +0200
parents b11f6a08f748
children e7ca6f16d074
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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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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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 /**
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83 * @throws HgBadStateException if internal read operation failed
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84 */
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85 public int dataLength(int revision) {
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86 // XXX in fact, use of iterate() instead of this implementation may be quite reasonable.
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87 //
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88 final int indexSize = revisionCount();
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89 DataAccess daIndex = getIndexStream();
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90 if (revision == TIP) {
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91 revision = indexSize - 1;
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92 }
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93 try {
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94 int recordOffset = getIndexOffsetInt(revision);
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95 daIndex.seek(recordOffset + 12); // 6+2+4
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96 int actualLen = daIndex.readInt();
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97 return actualLen;
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98 } catch (IOException ex) {
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99 ex.printStackTrace(); // log error. FIXME better handling
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100 throw new HgBadStateException(ex);
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101 } finally {
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102 daIndex.done();
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103 }
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104 }
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105
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106 /**
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107 * @throws HgBadStateException if internal read operation failed
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108 */
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109 public byte[] nodeid(int revision) {
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110 final int indexSize = revisionCount();
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111 if (revision == TIP) {
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112 revision = indexSize - 1;
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113 }
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114 if (revision < 0 || revision >= indexSize) {
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115 throw new IllegalArgumentException(Integer.toString(revision));
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116 }
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117 DataAccess daIndex = getIndexStream();
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118 try {
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119 int recordOffset = getIndexOffsetInt(revision);
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120 daIndex.seek(recordOffset + 32);
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121 byte[] rv = new byte[20];
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122 daIndex.readBytes(rv, 0, 20);
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123 return rv;
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124 } catch (IOException ex) {
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125 ex.printStackTrace();
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126 throw new HgBadStateException();
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127 } finally {
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128 daIndex.done();
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129 }
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130 }
295
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131
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132 /**
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133 * Get link field from the index record.
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134 * @throws HgBadStateException if internal read operation failed
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135 */
88
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136 public int linkRevision(int revision) {
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137 final int last = revisionCount() - 1;
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138 if (revision == TIP) {
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139 revision = last;
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140 }
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141 if (revision < 0 || revision > last) {
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142 throw new IllegalArgumentException(Integer.toString(revision));
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143 }
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144 DataAccess daIndex = getIndexStream();
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145 try {
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146 int recordOffset = getIndexOffsetInt(revision);
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147 daIndex.seek(recordOffset + 20);
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148 int linkRev = daIndex.readInt();
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149 return linkRev;
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150 } catch (IOException ex) {
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151 ex.printStackTrace();
295
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152 throw new HgBadStateException();
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153 } finally {
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154 daIndex.done();
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155 }
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156 }
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157
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158 // Perhaps, RevlogStream should be limited to use of plain int revisions for access,
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159 // while Nodeids should be kept on the level up, in Revlog. Guess, Revlog better keep
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160 // map of nodeids, and once this comes true, we may get rid of this method.
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161 // Unlike its counterpart, {@link Revlog#getLocalRevisionNumber()}, doesn't fail with exception if node not found,
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162 /**
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163 * @return integer in [0..revisionCount()) or {@link HgRepository#BAD_REVISION} if not found
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164 */
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165 public int findLocalRevisionNumber(Nodeid nodeid) {
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166 // XXX this one may be implemented with iterate() once there's mechanism to stop iterations
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167 final int indexSize = revisionCount();
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168 DataAccess daIndex = getIndexStream();
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169 try {
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170 byte[] nodeidBuf = new byte[20];
22
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171 for (int i = 0; i < indexSize; i++) {
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172 daIndex.skip(8);
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173 int compressedLen = daIndex.readInt();
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174 daIndex.skip(20);
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175 daIndex.readBytes(nodeidBuf, 0, 20);
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176 if (nodeid.equalsTo(nodeidBuf)) {
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177 return i;
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178 }
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179 daIndex.skip(inline ? 12 + compressedLen : 12);
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180 }
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181 } catch (IOException ex) {
243
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182 ex.printStackTrace(); // log error. FIXME better handling. Perhaps, shall return BAD_REVISION here as well?
22
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183 throw new IllegalStateException(ex);
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184 } finally {
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185 daIndex.done();
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186 }
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187 return BAD_REVISION;
22
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188 }
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189
2
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190
9
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191 private final int REVLOGV1_RECORD_SIZE = 64;
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192
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193 // should be possible to use TIP, ALL, or -1, -2, -n notation of Hg
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194 // ? boolean needsNodeid
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195 public void iterate(int start, int end, boolean needData, Inspector inspector) {
2
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196 initOutline();
198
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197 final int indexSize = revisionCount();
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198 if (indexSize == 0) {
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199 return;
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200 }
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201 if (end == TIP) {
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202 end = indexSize - 1;
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203 }
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204 if (start == TIP) {
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205 start = indexSize - 1;
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206 }
2
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207 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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208 throw new IllegalArgumentException(String.format("Bad left range boundary %d in [0..%d]", start, indexSize-1));
2
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209 }
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210 if (end < start || end >= indexSize) {
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211 throw new IllegalArgumentException(String.format("Bad right range boundary %d in [0..%d]", end, indexSize-1));
2
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212 }
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213 // XXX may cache [start .. end] from index with a single read (pre-read)
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214
242
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diff changeset
215 ReaderN1 r = new ReaderN1(needData, inspector);
2
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216 try {
242
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217 r.start(end - start + 1);
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218 r.range(start, end);
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219 } catch (IOException ex) {
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220 throw new HgBadStateException(ex); // FIXME need better handling
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diff changeset
221 } finally {
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diff changeset
222 r.finish();
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diff changeset
223 }
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diff changeset
224 }
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diff changeset
225
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diff changeset
226 /**
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227 * Effective alternative to {@link #iterate(int, int, boolean, Inspector) batch read}, when only few selected
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228 * revisions are of interest.
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229 * @param sortedRevisions revisions to walk, in ascending order.
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diff changeset
230 * @param needData whether inspector needs access to header only
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231 * @param inspector callback to process entries
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diff changeset
232 */
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diff changeset
233 public void iterate(int[] sortedRevisions, boolean needData, Inspector inspector) {
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diff changeset
234 final int indexSize = revisionCount();
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diff changeset
235 if (indexSize == 0 || sortedRevisions.length == 0) {
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diff changeset
236 return;
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237 }
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diff changeset
238 if (sortedRevisions[0] > indexSize || sortedRevisions[sortedRevisions.length - 1] > indexSize) {
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diff changeset
239 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
240 }
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diff changeset
241
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diff changeset
242 ReaderN1 r = new ReaderN1(needData, inspector);
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diff changeset
243 try {
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diff changeset
244 r.start(sortedRevisions.length);
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diff changeset
245 for (int i = 0; i < sortedRevisions.length; ) {
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diff changeset
246 int x = i;
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diff changeset
247 i++;
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diff changeset
248 while (i < sortedRevisions.length) {
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diff changeset
249 if (sortedRevisions[i] == sortedRevisions[i-1] + 1) {
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diff changeset
250 i++;
2
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diff changeset
251 } 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
252 break;
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253 }
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254 }
242
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255 // commitRevisions[x..i-1] are sequential
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256 if (!r.range(sortedRevisions[x], sortedRevisions[i-1])) {
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257 return;
51
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
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258 }
2
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259 }
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260 } 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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261 throw new HgBadStateException(ex); // FIXME need better handling
3
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262 } finally {
242
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263 r.finish();
2
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264 }
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265 }
198
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266
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267 private int getBaseRevision(int revision) {
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268 return baseRevisions[revision];
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269 }
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270
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271 /**
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272 * @return offset of the revision's record in the index (.i) stream
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273 */
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274 private int getIndexOffsetInt(int revision) {
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275 return inline ? indexRecordOffset[revision] : revision * REVLOGV1_RECORD_SIZE;
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276 }
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277
2
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278 private void initOutline() {
198
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279 if (baseRevisions != null && baseRevisions.length > 0) {
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280 return;
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281 }
9
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282 DataAccess da = getIndexStream();
2
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283 try {
202
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284 if (da.isEmpty()) {
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285 // do not fail with exception if stream is empty, it's likely intentional
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286 baseRevisions = new int[0];
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287 return;
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288 }
9
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289 int versionField = da.readInt();
170
71ddbf8603e8 Initial clone: populate given directory from a bundle. Everything but remote server access is there, albeit prototype code style
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290 da.readInt(); // just to skip next 4 bytes of offset + flags
2
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291 final int INLINEDATA = 1 << 16;
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292 inline = (versionField & INLINEDATA) != 0;
288
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293 IntVector resBases, resOffsets = null;
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294 int entryCountGuess = da.length() / REVLOGV1_RECORD_SIZE;
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295 if (inline) {
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296 entryCountGuess >>>= 2; // pure guess, assume useful data takes 3/4 of total space
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297 resOffsets = new IntVector(entryCountGuess, 5000);
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298 }
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299 resBases = new IntVector(entryCountGuess, 5000);
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300
2
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301 long offset = 0; // first offset is always 0, thus Hg uses it for other purposes
9
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302 while(true) {
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303 int compressedLen = da.readInt();
5
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304 // 8+4 = 12 bytes total read here
49
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diff changeset
305 @SuppressWarnings("unused")
9
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306 int actualLen = da.readInt();
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307 int baseRevision = da.readInt();
5
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308 // 12 + 8 = 20 bytes read here
2
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309 // int linkRevision = di.readInt();
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310 // int parent1Revision = di.readInt();
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311 // int parent2Revision = di.readInt();
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312 // byte[] nodeid = new byte[32];
198
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313 resBases.add(baseRevision);
2
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diff changeset
314 if (inline) {
198
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diff changeset
315 int o = (int) offset;
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diff changeset
316 if (o != offset) {
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317 // just in case, can't happen, ever, unless HG (or some other bad tool) produces index file
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318 // with inlined data of size greater than 2 Gb.
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319 throw new HgBadStateException("Data too big, offset didn't fit to sizeof(int)");
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320 }
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321 resOffsets.add(o + REVLOGV1_RECORD_SIZE * resOffsets.size());
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322 da.skip(3*4 + 32 + compressedLen); // Check: 44 (skip) + 20 (read) = 64 (total RevlogNG record size)
2
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323 } else {
9
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diff changeset
324 da.skip(3*4 + 32);
2
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325 }
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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diff changeset
326 if (da.isEmpty()) {
9
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327 // fine, done then
288
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diff changeset
328 baseRevisions = resBases.toArray(true);
198
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diff changeset
329 if (inline) {
288
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diff changeset
330 indexRecordOffset = resOffsets.toArray(true);
198
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diff changeset
331 }
9
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diff changeset
332 break;
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diff changeset
333 } else {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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334 // start reading next record
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diff changeset
335 long l = da.readLong();
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diff changeset
336 offset = l >>> 16;
9
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diff changeset
337 }
2
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diff changeset
338 }
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diff changeset
339 } catch (IOException ex) {
9
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diff changeset
340 ex.printStackTrace(); // log error
198
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diff changeset
341 // too bad, no outline then, but don't fail with NPE
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diff changeset
342 baseRevisions = new int[0];
9
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diff changeset
343 } finally {
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diff changeset
344 da.done();
2
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diff changeset
345 }
3
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diff changeset
346 }
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
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diff changeset
347
242
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diff changeset
348 /**
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349 * operation with single file open/close and multiple diverse reads.
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diff changeset
350 * XXX initOutline might need similar extraction to keen N1 format knowledge
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diff changeset
351 */
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diff changeset
352 class ReaderN1 {
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diff changeset
353 private final Inspector inspector;
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354 private final boolean needData;
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diff changeset
355 private DataAccess daIndex = null, daData = null;
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356 private Lifecycle.BasicCallback cb = null;
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diff changeset
357 private int lastRevisionRead = BAD_REVISION;
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358 private DataAccess lastUserData;
263
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diff changeset
359 // next are to track two major bottlenecks - patch application and actual time spent in inspector
264
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diff changeset
360 // private long applyTime, inspectorTime; // TIMING
263
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361
242
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diff changeset
362
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363 public ReaderN1(boolean needData, Inspector insp) {
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364 assert insp != null;
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365 this.needData = needData;
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366 inspector = insp;
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367 }
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368
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369 public void start(int totalWork) {
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370 daIndex = getIndexStream();
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diff changeset
371 if (needData && !inline) {
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diff changeset
372 daData = getDataStream();
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373 }
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374 if (inspector instanceof Lifecycle) {
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375 cb = new Lifecycle.BasicCallback();
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376 ((Lifecycle) inspector).start(totalWork, cb, cb);
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377 }
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378 // applyTime = inspectorTime = 0; // TIMING
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379 }
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380
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381 public void finish() {
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382 if (lastUserData != null) {
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383 lastUserData.done();
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384 lastUserData = null;
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385 }
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386 if (inspector instanceof Lifecycle) {
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387 ((Lifecycle) inspector).finish(cb);
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388 }
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389 daIndex.done();
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390 if (daData != null) {
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391 daData.done();
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392 }
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393 // System.out.printf("applyTime:%d ms, inspectorTime: %d ms\n", applyTime, inspectorTime); // TIMING
242
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394 }
263
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395
242
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396 public boolean range(int start, int end) throws IOException {
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397 byte[] nodeidBuf = new byte[20];
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398 int i;
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399 boolean extraReadsToBaseRev = false; // to indicate we read revision prior to start. XXX not sure can't do without
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400 // it (i.e. replace with i >= start)
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401 if (needData && (i = getBaseRevision(start)) < start) {
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402 // if lastRevisionRead in [baseRevision(start), start) can reuse lastUserData
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403 // doesn't make sense to reuse if lastRevisionRead == start (too much to change in the cycle below).
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404 if (lastRevisionRead != BAD_REVISION && i <= lastRevisionRead && lastRevisionRead < start) {
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405 i = lastRevisionRead + 1; // start with first not-yet-read revision
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406 extraReadsToBaseRev = i < start;
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407 } else {
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408 if (lastUserData != null) {
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409 lastUserData.done();
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410 lastUserData = null;
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411 }
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412 extraReadsToBaseRev = true;
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413 }
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414 } else {
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415 // don't need to clean lastUserData as it's always null when !needData
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416 i = start;
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417 }
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418
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419 daIndex.seek(getIndexOffsetInt(i));
258
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420 //
263
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421 // reuse some instances
258
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422 final ArrayList<PatchRecord> patches = new ArrayList<PatchRecord>();
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423 final Inflater inflater = new Inflater();
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424 // can share buffer between instances of InflaterDataAccess as I never read any two of them in parallel
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425 final byte[] inflaterBuffer = new byte[1024];
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426 //
242
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427
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428 for (; i <= end; i++ ) {
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429 if (inline && needData) {
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430 // inspector reading data (though FilterDataAccess) may have affected index position
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431 daIndex.seek(getIndexOffsetInt(i));
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432 }
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433 long l = daIndex.readLong(); // 0
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434 long offset = i == 0 ? 0 : (l >>> 16);
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435 @SuppressWarnings("unused")
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436 int flags = (int) (l & 0X0FFFF);
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437 int compressedLen = daIndex.readInt(); // +8
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438 int actualLen = daIndex.readInt(); // +12
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439 int baseRevision = daIndex.readInt(); // +16
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440 int linkRevision = daIndex.readInt(); // +20
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441 int parent1Revision = daIndex.readInt();
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442 int parent2Revision = daIndex.readInt();
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443 // Hg has 32 bytes here, uses 20 for nodeid, and keeps 12 last bytes empty
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444 daIndex.readBytes(nodeidBuf, 0, 20); // +32
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445 daIndex.skip(12);
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446 DataAccess userDataAccess = null;
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447 if (needData) {
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448 int streamOffset;
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449 DataAccess streamDataAccess;
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450 if (inline) {
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451 streamDataAccess = daIndex;
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452 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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453 } else {
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454 streamOffset = (int) offset;
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455 streamDataAccess = daData;
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456 daData.seek(streamOffset);
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457 }
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458 final boolean patchToPrevious = baseRevision != i; // the only way I found to tell if it's a patch
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459 if (streamDataAccess.isEmpty()) {
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460 userDataAccess = new DataAccess(); // empty
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461 } else {
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462 final byte firstByte = streamDataAccess.readByte();
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463 if (firstByte == 0x78 /* 'x' */) {
263
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464 inflater.reset();
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465 userDataAccess = new InflaterDataAccess(streamDataAccess, streamOffset, compressedLen, patchToPrevious ? -1 : actualLen, inflater, inflaterBuffer);
242
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466 } else if (firstByte == 0x75 /* 'u' */) {
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467 userDataAccess = new FilterDataAccess(streamDataAccess, streamOffset+1, compressedLen-1);
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468 } else {
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469 // XXX Python impl in fact throws exception when there's not 'x', 'u' or '0'
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470 // but I don't see reason not to return data as is
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471 userDataAccess = new FilterDataAccess(streamDataAccess, streamOffset, compressedLen);
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472 }
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473 }
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474 // XXX
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475 if (patchToPrevious) {
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476 // this is a patch
263
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477 patches.clear(); // won't hurt to ensure there are no leftovers, even if we already cleaned
242
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478 while (!userDataAccess.isEmpty()) {
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479 PatchRecord pr = PatchRecord.read(userDataAccess);
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480 // System.out.printf("PatchRecord:%d %d %d\n", pr.start, pr.end, pr.len);
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481 patches.add(pr);
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482 }
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483 userDataAccess.done();
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484 //
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485 // it shall be reset at the end of prev iteration, when it got assigned from userDataAccess
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486 // however, actual userDataAccess and lastUserData may share Inflater object, which needs to be reset
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487 // Alternatively, userDataAccess.done() above may be responsible to reset Inflater (if it's InflaterDataAccess)
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488 lastUserData.reset();
264
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489 // final long startMeasuring = System.currentTimeMillis(); // TIMING
242
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490 byte[] userData = apply(lastUserData, actualLen, patches);
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491 // applyTime += (System.currentTimeMillis() - startMeasuring); // TIMING
263
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492 patches.clear(); // do not keep any reference, allow PatchRecord to be gc'd
242
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493 userDataAccess = new ByteArrayDataAccess(userData);
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494 }
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495 } else {
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496 if (inline) {
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497 daIndex.skip(compressedLen);
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498 }
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499 }
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500 if (!extraReadsToBaseRev || i >= start) {
264
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501 // final long startMeasuring = System.currentTimeMillis(); // TIMING
242
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502 inspector.next(i, actualLen, baseRevision, linkRevision, parent1Revision, parent2Revision, nodeidBuf, userDataAccess);
264
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diff changeset
503 // inspectorTime += (System.currentTimeMillis() - startMeasuring); // TIMING
242
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504 }
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diff changeset
505 if (cb != null) {
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diff changeset
506 if (cb.isStopped()) {
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diff changeset
507 return false;
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diff changeset
508 }
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diff changeset
509 }
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diff changeset
510 if (userDataAccess != null) {
263
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511 userDataAccess.reset(); // not sure this is necessary here, as lastUserData would get reset anyway before next use.
242
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512 }
263
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513 if (lastUserData != null) {
31f67be94e71 RevlogStream - reduce number of object instances, reuse when possible
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diff changeset
514 lastUserData.done();
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diff changeset
515 }
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diff changeset
516 lastUserData = userDataAccess;
242
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517 }
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518 lastRevisionRead = end;
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diff changeset
519 return true;
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diff changeset
520 }
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521 }
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diff changeset
522
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diff changeset
523
198
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
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diff changeset
524 private static int[] toArray(List<Integer> l) {
33a7d76f067b Performance optimization: reduce memory to keep revlog cached info
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diff changeset
525 int[] rv = new int[l.size()];
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diff changeset
526 for (int i = 0; i < rv.length; i++) {
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diff changeset
527 rv[i] = l.get(i);
2
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diff changeset
528 }
198
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529 return rv;
2
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530 }
198
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diff changeset
531
3
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532
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533 // mpatch.c : apply()
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diff changeset
534 // FIXME need to implement patch merge (fold, combine, gather and discard from aforementioned mpatch.[c|py]), also see Revlog and Mercurial PDF
157
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parents: 53 102
diff changeset
535 public/*for HgBundle; until moved to better place*/static byte[] apply(DataAccess baseRevisionContent, int outcomeLen, List<PatchRecord> patch) throws IOException {
3
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diff changeset
536 int last = 0, destIndex = 0;
43
1b26247d7367 Calculate result length of the patch operarion, when unknown
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diff changeset
537 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
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 157
diff changeset
538 outcomeLen = baseRevisionContent.length();
263
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
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diff changeset
539 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
540 PatchRecord pr = patch.get(i);
43
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parents: 37
diff changeset
541 outcomeLen += pr.start - last + pr.len;
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parents: 37
diff changeset
542 last = pr.end;
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diff changeset
543 }
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diff changeset
544 outcomeLen -= last;
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diff changeset
545 last = 0;
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diff changeset
546 }
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diff changeset
547 byte[] rv = new byte[outcomeLen];
263
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parents: 258
diff changeset
548 for (int i = 0, x = patch.size(); i < x; i++) {
31f67be94e71 RevlogStream - reduce number of object instances, reuse when possible
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 258
diff changeset
549 PatchRecord pr = patch.get(i);
51
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
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parents: 49
diff changeset
550 baseRevisionContent.seek(last);
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parents: 49
diff changeset
551 baseRevisionContent.readBytes(rv, destIndex, pr.start-last);
3
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parents: 2
diff changeset
552 destIndex += pr.start - last;
43
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parents: 37
diff changeset
553 System.arraycopy(pr.data, 0, rv, destIndex, pr.data.length);
3
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diff changeset
554 destIndex += pr.data.length;
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diff changeset
555 last = pr.end;
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diff changeset
556 }
51
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diff changeset
557 baseRevisionContent.seek(last);
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
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diff changeset
558 baseRevisionContent.readBytes(rv, destIndex, (int) (baseRevisionContent.length() - last));
3
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diff changeset
559 return rv;
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diff changeset
560 }
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parents: 2
diff changeset
561
35
6061aa826a9e Complete parsing of the bundle format
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 33
diff changeset
562 // @see http://mercurial.selenic.com/wiki/BundleFormat, in Changelog group description
77
c677e1593919 Moved RevlogStream implementation into .internal
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parents: 74
diff changeset
563 public static class PatchRecord {
52
30bd38978846 brief explanation of patch record
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diff changeset
564 /*
30bd38978846 brief explanation of patch record
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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diff changeset
565 Given there are pr1 and pr2:
30bd38978846 brief explanation of patch record
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 49
diff changeset
566 pr1.start to pr1.end will be replaced with pr's data (of pr1.len)
30bd38978846 brief explanation of patch record
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 49
diff changeset
567 pr1.end to pr2.start gets copied from base
30bd38978846 brief explanation of patch record
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parents: 49
diff changeset
568 */
77
c677e1593919 Moved RevlogStream implementation into .internal
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diff changeset
569 public int start, end, len;
c677e1593919 Moved RevlogStream implementation into .internal
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diff changeset
570 public byte[] data;
3
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
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parents: 2
diff changeset
571
36
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parents: 35
diff changeset
572 // 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
573 private PatchRecord(int p1, int p2, int length, byte[] src) {
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parents: 35
diff changeset
574 start = p1;
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diff changeset
575 end = p2;
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parents: 35
diff changeset
576 len = length;
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parents: 35
diff changeset
577 data = src;
3
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parents: 2
diff changeset
578 }
36
205f9b59b400 Strip parsing logic out from console frontend
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parents: 35
diff changeset
579
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parents: 35
diff changeset
580 /*package-local*/ static PatchRecord read(byte[] data, int offset) {
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 35
diff changeset
581 final int x = offset; // shorthand
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 35
diff changeset
582 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
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 35
diff changeset
583 int p2 = ((data[x+4] & 0xFF) << 24) | ((data[x+5] & 0xFF) << 16) | ((data[x+6] & 0xFF) << 8) | (data[x+7] & 0xFF);
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 35
diff changeset
584 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
585 byte[] dataCopy = new byte[len];
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parents: 35
diff changeset
586 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
587 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
588 }
205f9b59b400 Strip parsing logic out from console frontend
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parents: 35
diff changeset
589
77
c677e1593919 Moved RevlogStream implementation into .internal
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 74
diff changeset
590 public /*for HgBundle*/ static PatchRecord read(DataAccess da) throws IOException {
36
205f9b59b400 Strip parsing logic out from console frontend
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parents: 35
diff changeset
591 int p1 = da.readInt();
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parents: 35
diff changeset
592 int p2 = da.readInt();
205f9b59b400 Strip parsing logic out from console frontend
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 35
diff changeset
593 int len = da.readInt();
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 35
diff changeset
594 byte[] src = new byte[len];
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 35
diff changeset
595 da.readBytes(src, 0, len);
205f9b59b400 Strip parsing logic out from console frontend
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 35
diff changeset
596 return new PatchRecord(p1, p2, len, src);
205f9b59b400 Strip parsing logic out from console frontend
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 35
diff changeset
597 }
77
c677e1593919 Moved RevlogStream implementation into .internal
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 74
diff changeset
598 }
c677e1593919 Moved RevlogStream implementation into .internal
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 74
diff changeset
599
c677e1593919 Moved RevlogStream implementation into .internal
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 74
diff changeset
600 // 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
601 // instantly - e.g. calculate hash, or comparing two revisions
c677e1593919 Moved RevlogStream implementation into .internal
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parents: 74
diff changeset
602 public interface Inspector {
c677e1593919 Moved RevlogStream implementation into .internal
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parents: 74
diff changeset
603 // 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
604 // 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
605 // 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
606 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
607 }
0
dbd663faec1f Basic changelog parsing
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
608 }