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annotate src/org/tmatesoft/hg/internal/RevlogStream.java @ 198:33a7d76f067b

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Performance optimization: reduce memory to keep revlog cached info
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 20 Apr 2011 05:40:14 +0200
parents 71ddbf8603e8
children 706bcc7cfee4
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.LinkedList;
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26 import java.util.List;
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27
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28 import org.tmatesoft.hg.core.HgBadStateException;
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29 import org.tmatesoft.hg.core.Nodeid;
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30 import org.tmatesoft.hg.repo.HgRepository;
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33 /**
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34 * ? Single RevlogStream per file per repository with accessor to record access session (e.g. with back/forward operations),
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35 * or numerous RevlogStream with separate representation of the underlying data (cached, lazy ChunkStream)?
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36 *
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37 * @see http://mercurial.selenic.com/wiki/Revlog
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38 * @see http://mercurial.selenic.com/wiki/RevlogNG
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39 *
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40 * @author Artem Tikhomirov
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41 * @author TMate Software Ltd.
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42 */
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43 public class RevlogStream {
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44
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45 /*
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46 * makes sense for index with inline data only - actual offset of the record in the .i file (record entry + revision * record size))
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47 *
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48 * long[] in fact (there are 8-bytes field in the revlog)
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49 * However, (a) DataAccess currently doesn't operate with long seek/length
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50 * and, of greater significance, (b) files with inlined data are designated for smaller files,
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51 * guess, about 130 Kb, and offset there won't ever break int capacity
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52 */
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53 private int[] indexRecordOffset;
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54 private int[] baseRevisions;
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55 private boolean inline = false;
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56 private final File indexFile;
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57 private final DataAccessProvider dataAccess;
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58
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59 // if we need anything else from HgRepo, might replace DAP parameter with HgRepo and query it for DAP.
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60 public RevlogStream(DataAccessProvider dap, File indexFile) {
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61 this.dataAccess = dap;
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62 this.indexFile = indexFile;
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63 }
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65 /*package*/ DataAccess getIndexStream() {
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66 return dataAccess.create(indexFile);
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67 }
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69 /*package*/ DataAccess getDataStream() {
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70 final String indexName = indexFile.getName();
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71 File dataFile = new File(indexFile.getParentFile(), indexName.substring(0, indexName.length() - 1) + "d");
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72 return dataAccess.create(dataFile);
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73 }
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75 public int revisionCount() {
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76 initOutline();
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77 return baseRevisions.length;
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78 }
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79
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80 public int dataLength(int revision) {
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81 // XXX in fact, use of iterate() instead of this implementation may be quite reasonable.
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82 //
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83 final int indexSize = revisionCount();
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84 DataAccess daIndex = getIndexStream(); // XXX may supply a hint that I'll need really few bytes of data (although at some offset)
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85 if (revision == TIP) {
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86 revision = indexSize - 1;
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87 }
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88 try {
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89 int recordOffset = getIndexOffsetInt(revision);
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90 daIndex.seek(recordOffset + 12); // 6+2+4
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91 int actualLen = daIndex.readInt();
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92 return actualLen;
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93 } catch (IOException ex) {
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94 ex.printStackTrace(); // log error. FIXME better handling
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95 throw new IllegalStateException(ex);
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96 } finally {
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97 daIndex.done();
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98 }
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99 }
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100
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101 public byte[] nodeid(int revision) {
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102 final int indexSize = revisionCount();
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103 if (revision == TIP) {
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104 revision = indexSize - 1;
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105 }
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106 if (revision < 0 || revision >= indexSize) {
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107 throw new IllegalArgumentException(Integer.toString(revision));
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108 }
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109 DataAccess daIndex = getIndexStream();
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110 try {
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111 int recordOffset = getIndexOffsetInt(revision);
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112 daIndex.seek(recordOffset + 32);
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113 byte[] rv = new byte[20];
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114 daIndex.readBytes(rv, 0, 20);
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115 return rv;
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116 } catch (IOException ex) {
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117 ex.printStackTrace();
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118 throw new IllegalStateException();
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119 } finally {
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120 daIndex.done();
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121 }
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122 }
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123
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124 public int linkRevision(int revision) {
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125 final int last = revisionCount() - 1;
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126 if (revision == TIP) {
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127 revision = last;
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128 }
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129 if (revision < 0 || revision > last) {
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130 throw new IllegalArgumentException(Integer.toString(revision));
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131 }
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132 DataAccess daIndex = getIndexStream();
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133 try {
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134 int recordOffset = getIndexOffsetInt(revision);
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135 daIndex.seek(recordOffset + 20);
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136 int linkRev = daIndex.readInt();
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137 return linkRev;
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138 } catch (IOException ex) {
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139 ex.printStackTrace();
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140 throw new IllegalStateException();
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141 } finally {
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142 daIndex.done();
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143 }
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144 }
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145
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146 // Perhaps, RevlogStream should be limited to use of plain int revisions for access,
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147 // while Nodeids should be kept on the level up, in Revlog. Guess, Revlog better keep
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148 // map of nodeids, and once this comes true, we may get rid of this method.
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149 // Unlike its counterpart, {@link Revlog#getLocalRevisionNumber()}, doesn't fail with exception if node not found,
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150 /**
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151 * @return integer in [0..revisionCount()) or {@link HgRepository#BAD_REVISION} if not found
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152 */
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153 public int findLocalRevisionNumber(Nodeid nodeid) {
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154 // XXX this one may be implemented with iterate() once there's mechanism to stop iterations
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155 final int indexSize = revisionCount();
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156 DataAccess daIndex = getIndexStream();
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157 try {
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158 byte[] nodeidBuf = new byte[20];
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159 for (int i = 0; i < indexSize; i++) {
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160 daIndex.skip(8);
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161 int compressedLen = daIndex.readInt();
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162 daIndex.skip(20);
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163 daIndex.readBytes(nodeidBuf, 0, 20);
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164 if (nodeid.equalsTo(nodeidBuf)) {
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165 return i;
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166 }
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167 daIndex.skip(inline ? 12 + compressedLen : 12);
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168 }
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169 } catch (IOException ex) {
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170 ex.printStackTrace(); // log error. FIXME better handling
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171 throw new IllegalStateException(ex);
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172 } finally {
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173 daIndex.done();
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174 }
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175 return BAD_REVISION;
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176 }
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177
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178
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179 private final int REVLOGV1_RECORD_SIZE = 64;
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180
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181 // should be possible to use TIP, ALL, or -1, -2, -n notation of Hg
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182 // ? boolean needsNodeid
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183 public void iterate(int start, int end, boolean needData, Inspector inspector) {
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184 initOutline();
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185 final int indexSize = revisionCount();
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186 if (indexSize == 0) {
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187 return;
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188 }
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189 if (end == TIP) {
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190 end = indexSize - 1;
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191 }
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192 if (start == TIP) {
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193 start = indexSize - 1;
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194 }
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195 if (start < 0 || start >= indexSize) {
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196 throw new IllegalArgumentException(String.format("Bad left range boundary %d in [0..%d]", start, indexSize-1));
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197 }
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198 if (end < start || end >= indexSize) {
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199 throw new IllegalArgumentException(String.format("Bad right range boundary %d in [0..%d]", end, indexSize-1));
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200 }
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201 // XXX may cache [start .. end] from index with a single read (pre-read)
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202
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203 DataAccess daIndex = null, daData = null;
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204 daIndex = getIndexStream();
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205 if (needData && !inline) {
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206 daData = getDataStream();
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207 }
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208 try {
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209 byte[] nodeidBuf = new byte[20];
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210 DataAccess lastUserData = null;
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211 int i;
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212 boolean extraReadsToBaseRev = false;
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213 if (needData && getBaseRevision(start) < start) {
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214 i = getBaseRevision(start);
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215 extraReadsToBaseRev = true;
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216 } else {
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217 i = start;
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218 }
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219
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220 daIndex.seek(getIndexOffsetInt(i));
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221 for (; i <= end; i++ ) {
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222 if (inline && needData) {
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223 // inspector reading data (though FilterDataAccess) may have affected index position
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224 daIndex.seek(getIndexOffsetInt(i));
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225 }
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226 long l = daIndex.readLong(); // 0
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227 long offset = i == 0 ? 0 : (l >>> 16);
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228 @SuppressWarnings("unused")
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229 int flags = (int) (l & 0X0FFFF);
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230 int compressedLen = daIndex.readInt(); // +8
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231 int actualLen = daIndex.readInt(); // +12
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232 int baseRevision = daIndex.readInt(); // +16
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233 int linkRevision = daIndex.readInt(); // +20
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234 int parent1Revision = daIndex.readInt();
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diff changeset
235 int parent2Revision = daIndex.readInt();
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236 // Hg has 32 bytes here, uses 20 for nodeid, and keeps 12 last bytes empty
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237 daIndex.readBytes(nodeidBuf, 0, 20); // +32
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238 daIndex.skip(12);
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diff changeset
239 DataAccess userDataAccess = null;
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240 if (needData) {
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diff changeset
241 final byte firstByte;
198
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diff changeset
242 int streamOffset;
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diff changeset
243 DataAccess streamDataAccess;
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diff changeset
244 if (inline) {
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diff changeset
245 streamDataAccess = daIndex;
198
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diff changeset
246 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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247 } else {
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diff changeset
248 streamOffset = (int) offset;
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diff changeset
249 streamDataAccess = daData;
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diff changeset
250 daData.seek(streamOffset);
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251 }
170
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252 final boolean patchToPrevious = baseRevision != i; // the only way I found to tell if it's a patch
51
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253 firstByte = streamDataAccess.readByte();
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254 if (firstByte == 0x78 /* 'x' */) {
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255 userDataAccess = new InflaterDataAccess(streamDataAccess, streamOffset, compressedLen, patchToPrevious ? -1 : actualLen);
51
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256 } else if (firstByte == 0x75 /* 'u' */) {
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257 userDataAccess = new FilterDataAccess(streamDataAccess, streamOffset+1, compressedLen-1);
2
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258 } else {
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259 // XXX Python impl in fact throws exception when there's not 'x', 'u' or '0'
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260 // but I don't see reason not to return data as is
51
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261 userDataAccess = new FilterDataAccess(streamDataAccess, streamOffset, compressedLen);
2
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262 }
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263 // XXX
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264 if (patchToPrevious) {
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265 // this is a patch
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266 LinkedList<PatchRecord> patches = new LinkedList<PatchRecord>();
51
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267 while (!userDataAccess.isEmpty()) {
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268 PatchRecord pr = PatchRecord.read(userDataAccess);
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d5268ca7715b Merged branch wrap-data-access into default for resource-friendly data access. Updated API to promote that friendliness to clients (channels, not byte[]). More exceptions
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269 // System.out.printf("PatchRecord:%d %d %d\n", pr.start, pr.end, pr.len);
36
205f9b59b400 Strip parsing logic out from console frontend
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270 patches.add(pr);
51
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271 }
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272 userDataAccess.done();
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273 //
51
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274 byte[] userData = apply(lastUserData, actualLen, patches);
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275 userDataAccess = new ByteArrayDataAccess(userData);
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276 }
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277 } else {
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278 if (inline) {
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279 daIndex.skip(compressedLen);
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280 }
2
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281 }
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282 if (!extraReadsToBaseRev || i >= start) {
51
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283 inspector.next(i, actualLen, baseRevision, linkRevision, parent1Revision, parent2Revision, nodeidBuf, userDataAccess);
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284 }
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285 if (userDataAccess != null) {
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286 userDataAccess.reset();
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287 if (lastUserData != null) {
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288 lastUserData.done();
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289 }
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290 lastUserData = userDataAccess;
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291 }
2
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292 }
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293 } catch (IOException ex) {
158
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294 throw new HgBadStateException(ex); // FIXME need better handling
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295 } finally {
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296 daIndex.done();
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297 if (daData != null) {
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298 daData.done();
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299 }
2
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300 }
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301 }
198
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302
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303 private int getBaseRevision(int revision) {
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304 return baseRevisions[revision];
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305 }
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306
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307 /**
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308 * @return offset of the revision's record in the index (.i) stream
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309 */
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310 private int getIndexOffsetInt(int revision) {
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311 return inline ? indexRecordOffset[revision] : revision * REVLOGV1_RECORD_SIZE;
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312 }
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313
2
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314 private void initOutline() {
198
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315 if (baseRevisions != null && baseRevisions.length > 0) {
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316 return;
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317 }
198
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318 ArrayList<Integer> resBases = new ArrayList<Integer>();
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319 ArrayList<Integer> resOffsets = new ArrayList<Integer>();
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320 DataAccess da = getIndexStream();
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321 try {
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322 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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diff changeset
323 da.readInt(); // just to skip next 4 bytes of offset + flags
2
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324 final int INLINEDATA = 1 << 16;
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325 inline = (versionField & INLINEDATA) != 0;
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diff changeset
326 long offset = 0; // first offset is always 0, thus Hg uses it for other purposes
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327 while(true) {
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diff changeset
328 int compressedLen = da.readInt();
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diff changeset
329 // 8+4 = 12 bytes total read here
49
26e3eeaa3962 branch and user filtering for log operation
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diff changeset
330 @SuppressWarnings("unused")
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331 int actualLen = da.readInt();
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332 int baseRevision = da.readInt();
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diff changeset
333 // 12 + 8 = 20 bytes read here
2
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334 // int linkRevision = di.readInt();
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diff changeset
335 // int parent1Revision = di.readInt();
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336 // int parent2Revision = di.readInt();
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diff changeset
337 // byte[] nodeid = new byte[32];
198
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diff changeset
338 resBases.add(baseRevision);
2
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diff changeset
339 if (inline) {
198
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diff changeset
340 int o = (int) offset;
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diff changeset
341 if (o != offset) {
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diff changeset
342 // just in case, can't happen, ever, unless HG (or some other bad tool) produces index file
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343 // with inlined data of size greater than 2 Gb.
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diff changeset
344 throw new HgBadStateException("Data too big, offset didn't fit to sizeof(int)");
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345 }
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diff changeset
346 resOffsets.add(o + REVLOGV1_RECORD_SIZE * resOffsets.size());
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diff changeset
347 da.skip(3*4 + 32 + compressedLen); // Check: 44 (skip) + 20 (read) = 64 (total RevlogNG record size)
2
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348 } else {
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diff changeset
349 da.skip(3*4 + 32);
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350 }
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diff changeset
351 if (da.isEmpty()) {
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diff changeset
352 // fine, done then
198
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353 baseRevisions = toArray(resBases);
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diff changeset
354 if (inline) {
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diff changeset
355 indexRecordOffset = toArray(resOffsets);
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356 }
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diff changeset
357 break;
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diff changeset
358 } else {
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359 // start reading next record
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diff changeset
360 long l = da.readLong();
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diff changeset
361 offset = l >>> 16;
9
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diff changeset
362 }
2
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diff changeset
363 }
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364 } catch (IOException ex) {
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diff changeset
365 ex.printStackTrace(); // log error
198
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diff changeset
366 // too bad, no outline then, but don't fail with NPE
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diff changeset
367 baseRevisions = new int[0];
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diff changeset
368 } finally {
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diff changeset
369 da.done();
2
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diff changeset
370 }
3
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diff changeset
371 }
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
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372
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373 private static int[] toArray(List<Integer> l) {
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374 int[] rv = new int[l.size()];
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375 for (int i = 0; i < rv.length; i++) {
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376 rv[i] = l.get(i);
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377 }
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378 return rv;
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379 }
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380
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381
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382 // mpatch.c : apply()
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383 // FIXME need to implement patch merge (fold, combine, gather and discard from aforementioned mpatch.[c|py]), also see Revlog and Mercurial PDF
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384 public/*for HgBundle; until moved to better place*/static byte[] apply(DataAccess baseRevisionContent, int outcomeLen, List<PatchRecord> patch) throws IOException {
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385 int last = 0, destIndex = 0;
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386 if (outcomeLen == -1) {
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387 outcomeLen = baseRevisionContent.length();
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388 for (PatchRecord pr : patch) {
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389 outcomeLen += pr.start - last + pr.len;
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390 last = pr.end;
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391 }
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392 outcomeLen -= last;
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393 last = 0;
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394 }
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395 byte[] rv = new byte[outcomeLen];
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396 for (PatchRecord pr : patch) {
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397 baseRevisionContent.seek(last);
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398 baseRevisionContent.readBytes(rv, destIndex, pr.start-last);
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399 destIndex += pr.start - last;
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400 System.arraycopy(pr.data, 0, rv, destIndex, pr.data.length);
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401 destIndex += pr.data.length;
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402 last = pr.end;
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403 }
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404 baseRevisionContent.seek(last);
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405 baseRevisionContent.readBytes(rv, destIndex, (int) (baseRevisionContent.length() - last));
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406 return rv;
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407 }
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408
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409 // @see http://mercurial.selenic.com/wiki/BundleFormat, in Changelog group description
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410 public static class PatchRecord {
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411 /*
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412 Given there are pr1 and pr2:
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413 pr1.start to pr1.end will be replaced with pr's data (of pr1.len)
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414 pr1.end to pr2.start gets copied from base
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415 */
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416 public int start, end, len;
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417 public byte[] data;
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418
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419 // TODO consider PatchRecord that only records data position (absolute in data source), and acquires data as needed
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420 private PatchRecord(int p1, int p2, int length, byte[] src) {
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421 start = p1;
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422 end = p2;
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423 len = length;
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424 data = src;
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425 }
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426
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427 /*package-local*/ static PatchRecord read(byte[] data, int offset) {
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428 final int x = offset; // shorthand
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429 int p1 = ((data[x] & 0xFF)<< 24) | ((data[x+1] & 0xFF) << 16) | ((data[x+2] & 0xFF) << 8) | (data[x+3] & 0xFF);
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430 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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431 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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432 byte[] dataCopy = new byte[len];
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433 System.arraycopy(data, x+12, dataCopy, 0, len);
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434 return new PatchRecord(p1, p2, len, dataCopy);
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435 }
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436
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437 public /*for HgBundle*/ static PatchRecord read(DataAccess da) throws IOException {
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438 int p1 = da.readInt();
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439 int p2 = da.readInt();
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440 int len = da.readInt();
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441 byte[] src = new byte[len];
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442 da.readBytes(src, 0, len);
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443 return new PatchRecord(p1, p2, len, src);
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444 }
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445 }
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446
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447 // 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
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448 // instantly - e.g. calculate hash, or comparing two revisions
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449 public interface Inspector {
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450 // XXX boolean retVal to indicate whether to continue?
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451 // TODO specify nodeid and data length, and reuse policy (i.e. if revlog stream doesn't reuse nodeid[] for each call)
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452 // implementers shall not invoke DataAccess.done(), it's accomplished by #iterate at appropraite moment
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453 void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[/*20*/] nodeid, DataAccess data);
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454 }
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455 }