Mercurial > jhg

annotate src/org/tmatesoft/hg/internal/RevlogStream.java @ 349:bba9f52cacf3

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author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 24 Nov 2011 04:33:42 +0100
parents 8da7ade36c57
children 5f9073eabf06
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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.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.HgInvalidRevisionException;
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28 import org.tmatesoft.hg.core.Nodeid;
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29 import org.tmatesoft.hg.repo.HgInternals;
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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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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) throws HgInvalidRevisionException {
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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 HgInvalidRevisionException(revision).setRevisionIndex(revision, 0, indexSize);
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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();
295
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126 throw new HgBadStateException();
80
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127 } finally {
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128 daIndex.done();
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129 }
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130 }
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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 */
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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];
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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) {
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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) throws HgInvalidRevisionException {
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 }
300
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207 HgInternals.checkRevlogRange(start, end, indexSize-1);
2
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208 // XXX may cache [start .. end] from index with a single read (pre-read)
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209
242
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210 ReaderN1 r = new ReaderN1(needData, inspector);
2
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211 try {
242
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212 r.start(end - start + 1);
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213 r.range(start, end);
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214 } catch (IOException ex) {
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215 throw new HgBadStateException(ex); // FIXME need better handling
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216 } finally {
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217 r.finish();
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218 }
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219 }
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220
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diff changeset
221 /**
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222 * Effective alternative to {@link #iterate(int, int, boolean, Inspector) batch read}, when only few selected
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223 * revisions are of interest.
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224 * @param sortedRevisions revisions to walk, in ascending order.
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225 * @param needData whether inspector needs access to header only
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226 * @param inspector callback to process entries
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227 */
347
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228 public void iterate(int[] sortedRevisions, boolean needData, Inspector inspector) throws HgInvalidRevisionException {
242
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229 final int indexSize = revisionCount();
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230 if (indexSize == 0 || sortedRevisions.length == 0) {
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231 return;
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232 }
347
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233 if (sortedRevisions[0] > indexSize) {
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diff changeset
234 throw new HgInvalidRevisionException(String.format("Can't iterate [%d, %d] in range [0..%d]", sortedRevisions[0], sortedRevisions[sortedRevisions.length - 1], indexSize), null, sortedRevisions[0]);
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diff changeset
235 }
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diff changeset
236 if (sortedRevisions[sortedRevisions.length - 1] > indexSize) {
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237 throw new HgInvalidRevisionException(String.format("Can't iterate [%d, %d] in range [0..%d]", sortedRevisions[0], sortedRevisions[sortedRevisions.length - 1], indexSize), null, sortedRevisions[sortedRevisions.length - 1]);
242
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238 }
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diff changeset
239
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diff changeset
240 ReaderN1 r = new ReaderN1(needData, inspector);
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diff changeset
241 try {
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242 r.start(sortedRevisions.length);
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diff changeset
243 for (int i = 0; i < sortedRevisions.length; ) {
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diff changeset
244 int x = i;
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diff changeset
245 i++;
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246 while (i < sortedRevisions.length) {
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diff changeset
247 if (sortedRevisions[i] == sortedRevisions[i-1] + 1) {
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diff changeset
248 i++;
2
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diff changeset
249 } else {
217
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diff changeset
250 break;
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251 }
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252 }
242
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253 // commitRevisions[x..i-1] are sequential
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254 if (!r.range(sortedRevisions[x], sortedRevisions[i-1])) {
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255 return;
51
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
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256 }
2
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257 }
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258 } catch (IOException ex) {
158
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259 throw new HgBadStateException(ex); // FIXME need better handling
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260 } finally {
242
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261 r.finish();
2
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262 }
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263 }
198
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264
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265 private int getBaseRevision(int revision) {
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266 return baseRevisions[revision];
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267 }
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268
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269 /**
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270 * @return offset of the revision's record in the index (.i) stream
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271 */
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272 private int getIndexOffsetInt(int revision) {
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273 return inline ? indexRecordOffset[revision] : revision * REVLOGV1_RECORD_SIZE;
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274 }
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275
2
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276 private void initOutline() {
198
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277 if (baseRevisions != null && baseRevisions.length > 0) {
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278 return;
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279 }
9
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280 DataAccess da = getIndexStream();
2
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281 try {
202
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282 if (da.isEmpty()) {
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283 // do not fail with exception if stream is empty, it's likely intentional
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284 baseRevisions = new int[0];
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285 return;
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286 }
9
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287 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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288 da.readInt(); // just to skip next 4 bytes of offset + flags
2
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289 final int INLINEDATA = 1 << 16;
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290 inline = (versionField & INLINEDATA) != 0;
288
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291 IntVector resBases, resOffsets = null;
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292 int entryCountGuess = da.length() / REVLOGV1_RECORD_SIZE;
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293 if (inline) {
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294 entryCountGuess >>>= 2; // pure guess, assume useful data takes 3/4 of total space
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295 resOffsets = new IntVector(entryCountGuess, 5000);
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296 }
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297 resBases = new IntVector(entryCountGuess, 5000);
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298
2
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299 long offset = 0; // first offset is always 0, thus Hg uses it for other purposes
9
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300 while(true) {
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301 int compressedLen = da.readInt();
5
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302 // 8+4 = 12 bytes total read here
49
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diff changeset
303 @SuppressWarnings("unused")
9
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304 int actualLen = da.readInt();
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305 int baseRevision = da.readInt();
5
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306 // 12 + 8 = 20 bytes read here
2
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307 // int linkRevision = di.readInt();
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308 // int parent1Revision = di.readInt();
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309 // int parent2Revision = di.readInt();
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310 // byte[] nodeid = new byte[32];
198
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311 resBases.add(baseRevision);
2
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312 if (inline) {
198
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diff changeset
313 int o = (int) offset;
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314 if (o != offset) {
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315 // just in case, can't happen, ever, unless HG (or some other bad tool) produces index file
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316 // with inlined data of size greater than 2 Gb.
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317 throw new HgBadStateException("Data too big, offset didn't fit to sizeof(int)");
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318 }
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319 resOffsets.add(o + REVLOGV1_RECORD_SIZE * resOffsets.size());
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320 da.skip(3*4 + 32 + compressedLen); // Check: 44 (skip) + 20 (read) = 64 (total RevlogNG record size)
2
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321 } else {
9
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322 da.skip(3*4 + 32);
2
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323 }
10
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diff changeset
324 if (da.isEmpty()) {
9
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325 // fine, done then
288
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diff changeset
326 baseRevisions = resBases.toArray(true);
198
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327 if (inline) {
288
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diff changeset
328 indexRecordOffset = resOffsets.toArray(true);
198
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diff changeset
329 }
9
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330 break;
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diff changeset
331 } else {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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332 // start reading next record
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diff changeset
333 long l = da.readLong();
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334 offset = l >>> 16;
9
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diff changeset
335 }
2
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336 }
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diff changeset
337 } catch (IOException ex) {
9
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diff changeset
338 ex.printStackTrace(); // log error
198
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diff changeset
339 // too bad, no outline then, but don't fail with NPE
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diff changeset
340 baseRevisions = new int[0];
9
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341 } finally {
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diff changeset
342 da.done();
2
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diff changeset
343 }
3
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diff changeset
344 }
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diff changeset
345
242
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diff changeset
346 /**
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347 * operation with single file open/close and multiple diverse reads.
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348 * XXX initOutline might need similar extraction to keen N1 format knowledge
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diff changeset
349 */
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diff changeset
350 class ReaderN1 {
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351 private final Inspector inspector;
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352 private final boolean needData;
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353 private DataAccess daIndex = null, daData = null;
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354 private Lifecycle.BasicCallback cb = null;
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diff changeset
355 private int lastRevisionRead = BAD_REVISION;
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356 private DataAccess lastUserData;
263
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diff changeset
357 // next are to track two major bottlenecks - patch application and actual time spent in inspector
264
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358 // private long applyTime, inspectorTime; // TIMING
263
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359
242
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diff changeset
360
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361 public ReaderN1(boolean needData, Inspector insp) {
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362 assert insp != null;
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363 this.needData = needData;
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364 inspector = insp;
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365 }
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366
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367 public void start(int totalWork) {
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368 daIndex = getIndexStream();
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diff changeset
369 if (needData && !inline) {
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370 daData = getDataStream();
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371 }
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372 if (inspector instanceof Lifecycle) {
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373 cb = new Lifecycle.BasicCallback();
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374 ((Lifecycle) inspector).start(totalWork, cb, cb);
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375 }
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376 // applyTime = inspectorTime = 0; // TIMING
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377 }
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378
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379 public void finish() {
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380 if (lastUserData != null) {
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381 lastUserData.done();
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382 lastUserData = null;
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383 }
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384 if (inspector instanceof Lifecycle) {
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385 ((Lifecycle) inspector).finish(cb);
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386 }
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387 daIndex.done();
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388 if (daData != null) {
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389 daData.done();
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390 }
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391 // System.out.printf("applyTime:%d ms, inspectorTime: %d ms\n", applyTime, inspectorTime); // TIMING
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392 }
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393
242
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394 public boolean range(int start, int end) throws IOException {
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395 byte[] nodeidBuf = new byte[20];
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396 int i;
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397 // it (i.e. replace with i >= start)
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398 if (needData && (i = getBaseRevision(start)) < start) {
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399 // if lastRevisionRead in [baseRevision(start), start) can reuse lastUserData
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400 // doesn't make sense to reuse if lastRevisionRead == start (too much to change in the cycle below).
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401 if (lastRevisionRead != BAD_REVISION && i <= lastRevisionRead && lastRevisionRead < start) {
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402 i = lastRevisionRead + 1; // start with first not-yet-read revision
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403 } else {
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404 if (lastUserData != null) {
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405 lastUserData.done();
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406 lastUserData = null;
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407 }
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408 }
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409 } else {
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410 // don't need to clean lastUserData as it's always null when !needData
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411 i = start;
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412 }
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413
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414 daIndex.seek(getIndexOffsetInt(i));
258
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415 //
263
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416 // reuse some instances
329
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417 final Patch patch = new Patch();
263
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418 final Inflater inflater = new Inflater();
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419 // can share buffer between instances of InflaterDataAccess as I never read any two of them in parallel
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420 final byte[] inflaterBuffer = new byte[1024];
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421 //
242
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422
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423 for (; i <= end; i++ ) {
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424 if (inline && needData) {
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425 // inspector reading data (though FilterDataAccess) may have affected index position
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426 daIndex.seek(getIndexOffsetInt(i));
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427 }
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428 long l = daIndex.readLong(); // 0
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429 long offset = i == 0 ? 0 : (l >>> 16);
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430 @SuppressWarnings("unused")
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431 int flags = (int) (l & 0X0FFFF);
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432 int compressedLen = daIndex.readInt(); // +8
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433 int actualLen = daIndex.readInt(); // +12
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434 int baseRevision = daIndex.readInt(); // +16
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435 int linkRevision = daIndex.readInt(); // +20
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436 int parent1Revision = daIndex.readInt();
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437 int parent2Revision = daIndex.readInt();
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438 // Hg has 32 bytes here, uses 20 for nodeid, and keeps 12 last bytes empty
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439 daIndex.readBytes(nodeidBuf, 0, 20); // +32
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440 daIndex.skip(12);
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441 DataAccess userDataAccess = null;
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442 if (needData) {
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443 int streamOffset;
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444 DataAccess streamDataAccess;
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445 if (inline) {
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446 streamDataAccess = daIndex;
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447 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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448 } else {
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449 streamOffset = (int) offset;
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450 streamDataAccess = daData;
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451 daData.seek(streamOffset);
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452 }
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453 final boolean patchToPrevious = baseRevision != i; // the only way I found to tell if it's a patch
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454 if (streamDataAccess.isEmpty()) {
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455 userDataAccess = new DataAccess(); // empty
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456 } else {
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457 final byte firstByte = streamDataAccess.readByte();
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458 if (firstByte == 0x78 /* 'x' */) {
263
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459 inflater.reset();
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460 userDataAccess = new InflaterDataAccess(streamDataAccess, streamOffset, compressedLen, patchToPrevious ? -1 : actualLen, inflater, inflaterBuffer);
242
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461 } else if (firstByte == 0x75 /* 'u' */) {
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462 userDataAccess = new FilterDataAccess(streamDataAccess, streamOffset+1, compressedLen-1);
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463 } else {
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464 // XXX Python impl in fact throws exception when there's not 'x', 'u' or '0'
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465 // but I don't see reason not to return data as is
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466 userDataAccess = new FilterDataAccess(streamDataAccess, streamOffset, compressedLen);
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467 }
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468 }
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469 // XXX
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470 if (patchToPrevious) {
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471 // this is a patch
329
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472 patch.read(userDataAccess);
242
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473 userDataAccess.done();
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474 //
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475 // it shall be reset at the end of prev iteration, when it got assigned from userDataAccess
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476 // however, actual userDataAccess and lastUserData may share Inflater object, which needs to be reset
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477 // Alternatively, userDataAccess.done() above may be responsible to reset Inflater (if it's InflaterDataAccess)
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478 lastUserData.reset();
264
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479 // final long startMeasuring = System.currentTimeMillis(); // TIMING
329
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480 byte[] userData = patch.apply(lastUserData, actualLen);
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481 // applyTime += (System.currentTimeMillis() - startMeasuring); // TIMING
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482 patch.clear(); // do not keep any reference, allow byte[] data to be gc'd
242
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483 userDataAccess = new ByteArrayDataAccess(userData);
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484 }
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485 } else {
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486 if (inline) {
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487 daIndex.skip(compressedLen);
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488 }
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489 }
329
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490 if (i >= start) {
264
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491 // final long startMeasuring = System.currentTimeMillis(); // TIMING
242
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492 inspector.next(i, actualLen, baseRevision, linkRevision, parent1Revision, parent2Revision, nodeidBuf, userDataAccess);
264
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493 // inspectorTime += (System.currentTimeMillis() - startMeasuring); // TIMING
242
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494 }
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495 if (cb != null) {
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496 if (cb.isStopped()) {
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497 return false;
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498 }
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499 }
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500 if (userDataAccess != null) {
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501 userDataAccess.reset(); // not sure this is necessary here, as lastUserData would get reset anyway before next use.
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502 }
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503 if (lastUserData != null) {
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504 lastUserData.done();
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505 }
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506 lastUserData = userDataAccess;
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507 }
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508 lastRevisionRead = end;
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509 return true;
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510 }
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parents: 223
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511 }
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parents: 223
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512
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parents: 223
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513
77
c677e1593919 Moved RevlogStream implementation into .internal
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514 public interface Inspector {
c677e1593919 Moved RevlogStream implementation into .internal
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515 // XXX boolean retVal to indicate whether to continue?
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516 // 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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parents: 53 102
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517 // implementers shall not invoke DataAccess.done(), it's accomplished by #iterate at appropraite moment
d5268ca7715b Merged branch wrap-data-access into default for resource-friendly data access. Updated API to promote that friendliness to clients (channels, not byte[]). More exceptions
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parents: 53 102
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518 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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519 }
0
dbd663faec1f Basic changelog parsing
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parents:
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520 }