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annotate src/org/tmatesoft/hg/internal/RevlogStream.java @ 330:9747a786a34d

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Patch merging algorithm complete trial
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 25 Oct 2011 03:30:02 +0200
parents 694ebabb5cb3
children 8da7ade36c57
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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22 import java.io.File;
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23 import java.io.IOException;
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24 import java.util.zip.Inflater;
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25
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26 import org.tmatesoft.hg.core.HgBadStateException;
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27 import org.tmatesoft.hg.core.Nodeid;
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28 import org.tmatesoft.hg.repo.HgInternals;
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29 import org.tmatesoft.hg.repo.HgRepository;
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32 /**
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33 * ? Single RevlogStream per file per repository with accessor to record access session (e.g. with back/forward operations),
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34 * or numerous RevlogStream with separate representation of the underlying data (cached, lazy ChunkStream)?
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35 *
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36 * @see http://mercurial.selenic.com/wiki/Revlog
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37 * @see http://mercurial.selenic.com/wiki/RevlogNG
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38 *
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39 * @author Artem Tikhomirov
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40 * @author TMate Software Ltd.
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41 */
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42 public class RevlogStream {
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44 /*
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45 * 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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46 *
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47 * long[] in fact (there are 8-bytes field in the revlog)
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48 * However, (a) DataAccess currently doesn't operate with long seek/length
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49 * and, of greater significance, (b) files with inlined data are designated for smaller files,
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50 * guess, about 130 Kb, and offset there won't ever break int capacity
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51 */
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52 private int[] indexRecordOffset;
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53 private int[] baseRevisions;
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54 private boolean inline = false;
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55 private final File indexFile;
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56 private final DataAccessProvider dataAccess;
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58 // if we need anything else from HgRepo, might replace DAP parameter with HgRepo and query it for DAP.
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59 public RevlogStream(DataAccessProvider dap, File indexFile) {
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60 this.dataAccess = dap;
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61 this.indexFile = indexFile;
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62 }
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64 /*package*/ DataAccess getIndexStream() {
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65 // XXX may supply a hint that I'll need really few bytes of data (perhaps, at some offset)
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66 // to avoid mmap files when only few bytes are to be read (i.e. #dataLength())
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67 return dataAccess.create(indexFile);
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68 }
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70 /*package*/ DataAccess getDataStream() {
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71 final String indexName = indexFile.getName();
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72 File dataFile = new File(indexFile.getParentFile(), indexName.substring(0, indexName.length() - 1) + "d");
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73 return dataAccess.create(dataFile);
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74 }
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76 public int revisionCount() {
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77 initOutline();
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78 return baseRevisions.length;
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79 }
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81 /**
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82 * @throws HgBadStateException if internal read operation failed
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83 */
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84 public int dataLength(int revision) {
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85 // XXX in fact, use of iterate() instead of this implementation may be quite reasonable.
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86 //
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87 final int indexSize = revisionCount();
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88 DataAccess daIndex = getIndexStream();
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89 if (revision == TIP) {
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90 revision = indexSize - 1;
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91 }
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92 try {
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93 int recordOffset = getIndexOffsetInt(revision);
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94 daIndex.seek(recordOffset + 12); // 6+2+4
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95 int actualLen = daIndex.readInt();
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96 return actualLen;
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97 } catch (IOException ex) {
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98 ex.printStackTrace(); // log error. FIXME better handling
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99 throw new HgBadStateException(ex);
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100 } finally {
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101 daIndex.done();
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102 }
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103 }
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104
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105 /**
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106 * @throws HgBadStateException if internal read operation failed
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107 */
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108 public byte[] nodeid(int revision) {
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109 final int indexSize = revisionCount();
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110 if (revision == TIP) {
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111 revision = indexSize - 1;
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112 }
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113 if (revision < 0 || revision >= indexSize) {
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114 throw new IllegalArgumentException(Integer.toString(revision));
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115 }
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116 DataAccess daIndex = getIndexStream();
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117 try {
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118 int recordOffset = getIndexOffsetInt(revision);
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119 daIndex.seek(recordOffset + 32);
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120 byte[] rv = new byte[20];
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121 daIndex.readBytes(rv, 0, 20);
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122 return rv;
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123 } catch (IOException ex) {
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124 ex.printStackTrace();
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125 throw new HgBadStateException();
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126 } finally {
88
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127 daIndex.done();
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128 }
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129 }
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130
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131 /**
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132 * Get link field from the index record.
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133 * @throws HgBadStateException if internal read operation failed
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134 */
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135 public int linkRevision(int revision) {
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136 final int last = revisionCount() - 1;
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137 if (revision == TIP) {
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138 revision = last;
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139 }
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140 if (revision < 0 || revision > last) {
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141 throw new IllegalArgumentException(Integer.toString(revision));
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142 }
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143 DataAccess daIndex = getIndexStream();
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144 try {
198
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145 int recordOffset = getIndexOffsetInt(revision);
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146 daIndex.seek(recordOffset + 20);
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147 int linkRev = daIndex.readInt();
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148 return linkRev;
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149 } catch (IOException ex) {
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150 ex.printStackTrace();
295
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151 throw new HgBadStateException();
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152 } finally {
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153 daIndex.done();
80
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154 }
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155 }
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156
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157 // Perhaps, RevlogStream should be limited to use of plain int revisions for access,
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158 // while Nodeids should be kept on the level up, in Revlog. Guess, Revlog better keep
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159 // map of nodeids, and once this comes true, we may get rid of this method.
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160 // Unlike its counterpart, {@link Revlog#getLocalRevisionNumber()}, doesn't fail with exception if node not found,
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161 /**
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162 * @return integer in [0..revisionCount()) or {@link HgRepository#BAD_REVISION} if not found
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163 */
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164 public int findLocalRevisionNumber(Nodeid nodeid) {
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165 // XXX this one may be implemented with iterate() once there's mechanism to stop iterations
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166 final int indexSize = revisionCount();
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167 DataAccess daIndex = getIndexStream();
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168 try {
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169 byte[] nodeidBuf = new byte[20];
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170 for (int i = 0; i < indexSize; i++) {
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171 daIndex.skip(8);
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172 int compressedLen = daIndex.readInt();
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173 daIndex.skip(20);
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174 daIndex.readBytes(nodeidBuf, 0, 20);
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175 if (nodeid.equalsTo(nodeidBuf)) {
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176 return i;
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177 }
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178 daIndex.skip(inline ? 12 + compressedLen : 12);
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179 }
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180 } catch (IOException ex) {
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181 ex.printStackTrace(); // log error. FIXME better handling. Perhaps, shall return BAD_REVISION here as well?
22
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182 throw new IllegalStateException(ex);
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183 } finally {
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184 daIndex.done();
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185 }
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186 return BAD_REVISION;
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187 }
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188
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189
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190 private final int REVLOGV1_RECORD_SIZE = 64;
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191
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192 // should be possible to use TIP, ALL, or -1, -2, -n notation of Hg
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193 // ? boolean needsNodeid
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194 public void iterate(int start, int end, boolean needData, Inspector inspector) {
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195 initOutline();
198
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196 final int indexSize = revisionCount();
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197 if (indexSize == 0) {
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198 return;
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199 }
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200 if (end == TIP) {
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201 end = indexSize - 1;
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202 }
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203 if (start == TIP) {
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204 start = indexSize - 1;
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205 }
300
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206 HgInternals.checkRevlogRange(start, end, indexSize-1);
2
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207 // XXX may cache [start .. end] from index with a single read (pre-read)
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208
242
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diff changeset
209 ReaderN1 r = new ReaderN1(needData, inspector);
2
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210 try {
242
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211 r.start(end - start + 1);
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212 r.range(start, end);
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213 } catch (IOException ex) {
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214 throw new HgBadStateException(ex); // FIXME need better handling
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215 } finally {
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216 r.finish();
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217 }
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218 }
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diff changeset
219
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diff changeset
220 /**
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221 * Effective alternative to {@link #iterate(int, int, boolean, Inspector) batch read}, when only few selected
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diff changeset
222 * revisions are of interest.
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diff changeset
223 * @param sortedRevisions revisions to walk, in ascending order.
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diff changeset
224 * @param needData whether inspector needs access to header only
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225 * @param inspector callback to process entries
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diff changeset
226 */
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diff changeset
227 public void iterate(int[] sortedRevisions, boolean needData, Inspector inspector) {
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228 final int indexSize = revisionCount();
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229 if (indexSize == 0 || sortedRevisions.length == 0) {
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230 return;
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231 }
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232 if (sortedRevisions[0] > indexSize || sortedRevisions[sortedRevisions.length - 1] > indexSize) {
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diff changeset
233 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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234 }
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235
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diff changeset
236 ReaderN1 r = new ReaderN1(needData, inspector);
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diff changeset
237 try {
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238 r.start(sortedRevisions.length);
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diff changeset
239 for (int i = 0; i < sortedRevisions.length; ) {
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240 int x = i;
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diff changeset
241 i++;
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242 while (i < sortedRevisions.length) {
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diff changeset
243 if (sortedRevisions[i] == sortedRevisions[i-1] + 1) {
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diff changeset
244 i++;
2
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diff changeset
245 } else {
217
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diff changeset
246 break;
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diff changeset
247 }
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diff changeset
248 }
242
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diff changeset
249 // commitRevisions[x..i-1] are sequential
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diff changeset
250 if (!r.range(sortedRevisions[x], sortedRevisions[i-1])) {
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diff changeset
251 return;
51
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diff changeset
252 }
2
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diff changeset
253 }
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diff changeset
254 } catch (IOException ex) {
158
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255 throw new HgBadStateException(ex); // FIXME need better handling
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256 } finally {
242
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257 r.finish();
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258 }
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259 }
198
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260
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261 private int getBaseRevision(int revision) {
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262 return baseRevisions[revision];
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263 }
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264
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265 /**
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266 * @return offset of the revision's record in the index (.i) stream
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267 */
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268 private int getIndexOffsetInt(int revision) {
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269 return inline ? indexRecordOffset[revision] : revision * REVLOGV1_RECORD_SIZE;
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270 }
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271
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272 private void initOutline() {
198
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273 if (baseRevisions != null && baseRevisions.length > 0) {
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274 return;
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275 }
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276 DataAccess da = getIndexStream();
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277 try {
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278 if (da.isEmpty()) {
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279 // do not fail with exception if stream is empty, it's likely intentional
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280 baseRevisions = new int[0];
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281 return;
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282 }
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283 int versionField = da.readInt();
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284 da.readInt(); // just to skip next 4 bytes of offset + flags
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285 final int INLINEDATA = 1 << 16;
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286 inline = (versionField & INLINEDATA) != 0;
288
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287 IntVector resBases, resOffsets = null;
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288 int entryCountGuess = da.length() / REVLOGV1_RECORD_SIZE;
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289 if (inline) {
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290 entryCountGuess >>>= 2; // pure guess, assume useful data takes 3/4 of total space
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291 resOffsets = new IntVector(entryCountGuess, 5000);
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292 }
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293 resBases = new IntVector(entryCountGuess, 5000);
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294
2
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295 long offset = 0; // first offset is always 0, thus Hg uses it for other purposes
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296 while(true) {
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297 int compressedLen = da.readInt();
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298 // 8+4 = 12 bytes total read here
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299 @SuppressWarnings("unused")
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300 int actualLen = da.readInt();
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301 int baseRevision = da.readInt();
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302 // 12 + 8 = 20 bytes read here
2
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303 // int linkRevision = di.readInt();
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304 // int parent1Revision = di.readInt();
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305 // int parent2Revision = di.readInt();
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306 // byte[] nodeid = new byte[32];
198
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307 resBases.add(baseRevision);
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308 if (inline) {
198
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309 int o = (int) offset;
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310 if (o != offset) {
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311 // just in case, can't happen, ever, unless HG (or some other bad tool) produces index file
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312 // with inlined data of size greater than 2 Gb.
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313 throw new HgBadStateException("Data too big, offset didn't fit to sizeof(int)");
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314 }
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315 resOffsets.add(o + REVLOGV1_RECORD_SIZE * resOffsets.size());
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316 da.skip(3*4 + 32 + compressedLen); // Check: 44 (skip) + 20 (read) = 64 (total RevlogNG record size)
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317 } else {
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318 da.skip(3*4 + 32);
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319 }
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320 if (da.isEmpty()) {
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321 // fine, done then
288
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322 baseRevisions = resBases.toArray(true);
198
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323 if (inline) {
288
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324 indexRecordOffset = resOffsets.toArray(true);
198
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325 }
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326 break;
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327 } else {
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328 // start reading next record
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329 long l = da.readLong();
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330 offset = l >>> 16;
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331 }
2
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332 }
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333 } catch (IOException ex) {
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334 ex.printStackTrace(); // log error
198
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335 // too bad, no outline then, but don't fail with NPE
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336 baseRevisions = new int[0];
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337 } finally {
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338 da.done();
2
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339 }
3
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340 }
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341
242
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342 /**
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343 * operation with single file open/close and multiple diverse reads.
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344 * XXX initOutline might need similar extraction to keen N1 format knowledge
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345 */
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346 class ReaderN1 {
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347 private final Inspector inspector;
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348 private final boolean needData;
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349 private DataAccess daIndex = null, daData = null;
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350 private Lifecycle.BasicCallback cb = null;
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351 private int lastRevisionRead = BAD_REVISION;
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352 private DataAccess lastUserData;
263
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353 // next are to track two major bottlenecks - patch application and actual time spent in inspector
264
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354 // private long applyTime, inspectorTime; // TIMING
263
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355
242
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356
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357 public ReaderN1(boolean needData, Inspector insp) {
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358 assert insp != null;
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359 this.needData = needData;
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360 inspector = insp;
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361 }
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362
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363 public void start(int totalWork) {
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364 daIndex = getIndexStream();
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365 if (needData && !inline) {
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366 daData = getDataStream();
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367 }
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368 if (inspector instanceof Lifecycle) {
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369 cb = new Lifecycle.BasicCallback();
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370 ((Lifecycle) inspector).start(totalWork, cb, cb);
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371 }
264
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372 // applyTime = inspectorTime = 0; // TIMING
242
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373 }
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374
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375 public void finish() {
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376 if (lastUserData != null) {
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377 lastUserData.done();
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378 lastUserData = null;
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379 }
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380 if (inspector instanceof Lifecycle) {
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381 ((Lifecycle) inspector).finish(cb);
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382 }
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383 daIndex.done();
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384 if (daData != null) {
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385 daData.done();
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386 }
264
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387 // System.out.printf("applyTime:%d ms, inspectorTime: %d ms\n", applyTime, inspectorTime); // TIMING
242
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388 }
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389
242
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390 public boolean range(int start, int end) throws IOException {
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391 byte[] nodeidBuf = new byte[20];
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392 int i;
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393 // it (i.e. replace with i >= start)
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394 if (needData && (i = getBaseRevision(start)) < start) {
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395 // if lastRevisionRead in [baseRevision(start), start) can reuse lastUserData
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396 // doesn't make sense to reuse if lastRevisionRead == start (too much to change in the cycle below).
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397 if (lastRevisionRead != BAD_REVISION && i <= lastRevisionRead && lastRevisionRead < start) {
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398 i = lastRevisionRead + 1; // start with first not-yet-read revision
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399 } else {
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400 if (lastUserData != null) {
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401 lastUserData.done();
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402 lastUserData = null;
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403 }
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404 }
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405 } else {
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406 // don't need to clean lastUserData as it's always null when !needData
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407 i = start;
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408 }
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409
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410 daIndex.seek(getIndexOffsetInt(i));
258
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411 //
263
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412 // reuse some instances
329
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413 final Patch patch = new Patch();
263
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414 final Inflater inflater = new Inflater();
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415 // can share buffer between instances of InflaterDataAccess as I never read any two of them in parallel
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416 final byte[] inflaterBuffer = new byte[1024];
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417 //
242
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418
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419 for (; i <= end; i++ ) {
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420 if (inline && needData) {
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421 // inspector reading data (though FilterDataAccess) may have affected index position
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422 daIndex.seek(getIndexOffsetInt(i));
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423 }
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424 long l = daIndex.readLong(); // 0
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425 long offset = i == 0 ? 0 : (l >>> 16);
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426 @SuppressWarnings("unused")
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427 int flags = (int) (l & 0X0FFFF);
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428 int compressedLen = daIndex.readInt(); // +8
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429 int actualLen = daIndex.readInt(); // +12
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430 int baseRevision = daIndex.readInt(); // +16
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431 int linkRevision = daIndex.readInt(); // +20
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432 int parent1Revision = daIndex.readInt();
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433 int parent2Revision = daIndex.readInt();
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434 // Hg has 32 bytes here, uses 20 for nodeid, and keeps 12 last bytes empty
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435 daIndex.readBytes(nodeidBuf, 0, 20); // +32
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436 daIndex.skip(12);
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437 DataAccess userDataAccess = null;
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438 if (needData) {
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439 int streamOffset;
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440 DataAccess streamDataAccess;
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441 if (inline) {
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442 streamDataAccess = daIndex;
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443 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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444 } else {
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445 streamOffset = (int) offset;
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446 streamDataAccess = daData;
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447 daData.seek(streamOffset);
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448 }
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449 final boolean patchToPrevious = baseRevision != i; // the only way I found to tell if it's a patch
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450 if (streamDataAccess.isEmpty()) {
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451 userDataAccess = new DataAccess(); // empty
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452 } else {
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453 final byte firstByte = streamDataAccess.readByte();
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454 if (firstByte == 0x78 /* 'x' */) {
263
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455 inflater.reset();
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456 userDataAccess = new InflaterDataAccess(streamDataAccess, streamOffset, compressedLen, patchToPrevious ? -1 : actualLen, inflater, inflaterBuffer);
242
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457 } else if (firstByte == 0x75 /* 'u' */) {
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458 userDataAccess = new FilterDataAccess(streamDataAccess, streamOffset+1, compressedLen-1);
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459 } else {
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460 // XXX Python impl in fact throws exception when there's not 'x', 'u' or '0'
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461 // but I don't see reason not to return data as is
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462 userDataAccess = new FilterDataAccess(streamDataAccess, streamOffset, compressedLen);
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463 }
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464 }
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465 // XXX
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466 if (patchToPrevious) {
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467 // this is a patch
329
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468 patch.read(userDataAccess);
242
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469 userDataAccess.done();
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470 //
263
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471 // it shall be reset at the end of prev iteration, when it got assigned from userDataAccess
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472 // however, actual userDataAccess and lastUserData may share Inflater object, which needs to be reset
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473 // Alternatively, userDataAccess.done() above may be responsible to reset Inflater (if it's InflaterDataAccess)
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474 lastUserData.reset();
264
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475 // final long startMeasuring = System.currentTimeMillis(); // TIMING
329
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476 byte[] userData = patch.apply(lastUserData, actualLen);
264
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477 // applyTime += (System.currentTimeMillis() - startMeasuring); // TIMING
329
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478 patch.clear(); // do not keep any reference, allow byte[] data to be gc'd
242
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479 userDataAccess = new ByteArrayDataAccess(userData);
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480 }
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481 } else {
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482 if (inline) {
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483 daIndex.skip(compressedLen);
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484 }
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485 }
329
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486 if (i >= start) {
264
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487 // final long startMeasuring = System.currentTimeMillis(); // TIMING
242
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488 inspector.next(i, actualLen, baseRevision, linkRevision, parent1Revision, parent2Revision, nodeidBuf, userDataAccess);
264
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489 // inspectorTime += (System.currentTimeMillis() - startMeasuring); // TIMING
242
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490 }
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491 if (cb != null) {
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492 if (cb.isStopped()) {
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493 return false;
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494 }
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495 }
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496 if (userDataAccess != null) {
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497 userDataAccess.reset(); // not sure this is necessary here, as lastUserData would get reset anyway before next use.
242
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498 }
263
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499 if (lastUserData != null) {
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500 lastUserData.done();
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501 }
31f67be94e71 RevlogStream - reduce number of object instances, reuse when possible
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 258
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502 lastUserData = userDataAccess;
242
ad6a046943be Improved reading of sparse revisions from a revlog
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 223
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503 }
ad6a046943be Improved reading of sparse revisions from a revlog
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 223
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504 lastRevisionRead = end;
ad6a046943be Improved reading of sparse revisions from a revlog
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 223
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505 return true;
ad6a046943be Improved reading of sparse revisions from a revlog
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 223
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506 }
ad6a046943be Improved reading of sparse revisions from a revlog
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 223
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507 }
ad6a046943be Improved reading of sparse revisions from a revlog
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 223
diff changeset
508
ad6a046943be Improved reading of sparse revisions from a revlog
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 223
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509
77
c677e1593919 Moved RevlogStream implementation into .internal
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 74
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510 public interface Inspector {
c677e1593919 Moved RevlogStream implementation into .internal
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 74
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511 // 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
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512 // 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
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513 // 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
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514 void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[/*20*/] nodeid, DataAccess data);
3
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
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515 }
0
dbd663faec1f Basic changelog parsing
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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516 }