annotate src/org/tmatesoft/hg/internal/RevlogStream.java @ 338:3cfa4d908fc9

Add options to control DataAccessProvider, allow to turn off use of file memory mapping in particular to solve potential sharing violation (os file handle gets released on MappedByteByffer being GC'd, not on FileChannel.close())
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 15 Nov 2011 04:47:03 +0100
parents 694ebabb5cb3
children 8da7ade36c57
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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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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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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 {
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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];
22
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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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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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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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diff changeset
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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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 }