Mercurial > hg4j

annotate src/org/tmatesoft/hg/repo/HgDataFile.java @ 233:1d389c0cb0a5

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Optimize file history walk not to iterat over whole changelog for sparse and distant revisions
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 03 Jun 2011 04:50:09 +0200
parents 41a778e3fd31
children 6e1373b54e9b
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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.repo;
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19 import static org.tmatesoft.hg.repo.HgInternals.wrongLocalRevision;
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20 import static org.tmatesoft.hg.repo.HgRepository.*;
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22 import java.io.ByteArrayOutputStream;
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23 import java.io.IOException;
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24 import java.nio.ByteBuffer;
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25 import java.util.ArrayList;
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26 import java.util.Collection;
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27 import java.util.TreeMap;
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29 import org.tmatesoft.hg.core.HgDataStreamException;
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30 import org.tmatesoft.hg.core.HgException;
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31 import org.tmatesoft.hg.core.Nodeid;
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32 import org.tmatesoft.hg.internal.DataAccess;
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33 import org.tmatesoft.hg.internal.FilterByteChannel;
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34 import org.tmatesoft.hg.internal.RevlogStream;
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35 import org.tmatesoft.hg.util.ByteChannel;
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36 import org.tmatesoft.hg.util.CancelledException;
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37 import org.tmatesoft.hg.util.Path;
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41 /**
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42 * ? name:HgFileNode?
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43 *
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44 * @author Artem Tikhomirov
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45 * @author TMate Software Ltd.
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46 */
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47 public class HgDataFile extends Revlog {
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48
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49 // absolute from repo root?
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50 // slashes, unix-style?
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51 // repo location agnostic, just to give info to user, not to access real storage
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52 private final Path path;
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53 private Metadata metadata; // get initialized on first access to file content.
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55 /*package-local*/HgDataFile(HgRepository hgRepo, Path filePath, RevlogStream content) {
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56 super(hgRepo, content);
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57 path = filePath;
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58 }
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60 /*package-local*/HgDataFile(HgRepository hgRepo, Path filePath) {
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61 super(hgRepo);
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62 path = filePath;
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63 }
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65 // exists is not the best name possible. now it means no file with such name was ever known to the repo.
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66 // it might be confused with files existed before but lately removed.
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67 public boolean exists() {
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68 return content != null; // XXX need better impl
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69 }
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71 // human-readable (i.e. "COPYING", not "store/data/_c_o_p_y_i_n_g.i")
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72 public Path getPath() {
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73 return path; // hgRepo.backresolve(this) -> name? In this case, what about hashed long names?
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74 }
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76 public int length(Nodeid nodeid) {
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77 return content.dataLength(getLocalRevision(nodeid));
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78 }
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80 public void workingCopy(ByteChannel sink) throws IOException, CancelledException {
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81 throw HgRepository.notImplemented();
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82 }
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84 // public void content(int revision, ByteChannel sink, boolean applyFilters) throws HgDataStreamException, IOException, CancelledException {
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85 // byte[] content = content(revision);
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86 // final CancelSupport cancelSupport = CancelSupport.Factory.get(sink);
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87 // final ProgressSupport progressSupport = ProgressSupport.Factory.get(sink);
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88 // ByteBuffer buf = ByteBuffer.allocate(512);
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89 // int left = content.length;
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90 // progressSupport.start(left);
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91 // int offset = 0;
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92 // cancelSupport.checkCancelled();
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93 // ByteChannel _sink = applyFilters ? new FilterByteChannel(sink, getRepo().getFiltersFromRepoToWorkingDir(getPath())) : sink;
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94 // do {
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95 // buf.put(content, offset, Math.min(left, buf.remaining()));
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96 // buf.flip();
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97 // cancelSupport.checkCancelled();
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98 // // XXX I may not rely on returned number of bytes but track change in buf position instead.
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99 // int consumed = _sink.write(buf);
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100 // buf.compact();
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101 // offset += consumed;
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102 // left -= consumed;
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103 // progressSupport.worked(consumed);
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104 // } while (left > 0);
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105 // progressSupport.done(); // XXX shall specify whether #done() is invoked always or only if completed successfully.
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106 // }
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108 /*XXX not sure distinct method contentWithFilters() is the best way to do, perhaps, callers shall add filters themselves?*/
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109 public void contentWithFilters(int revision, ByteChannel sink) throws HgDataStreamException, IOException, CancelledException {
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110 content(revision, new FilterByteChannel(sink, getRepo().getFiltersFromRepoToWorkingDir(getPath())));
115
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111 }
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112
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113 // for data files need to check heading of the file content for possible metadata
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114 // @see http://mercurial.selenic.com/wiki/FileFormats#data.2BAC8-
157
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115 public void content(int revision, ByteChannel sink) throws HgDataStreamException, IOException, CancelledException {
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116 if (revision == TIP) {
135
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117 revision = getLastRevision();
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118 }
157
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119 if (revision == WORKING_COPY) {
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120 workingCopy(sink);
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121 return;
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122 }
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123 if (wrongLocalRevision(revision) || revision == BAD_REVISION) {
148
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124 throw new IllegalArgumentException(String.valueOf(revision));
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125 }
157
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126 if (sink == null) {
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127 throw new IllegalArgumentException();
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128 }
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129 if (metadata == null) {
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130 metadata = new Metadata();
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131 }
157
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132 ContentPipe insp;
134
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133 if (metadata.none(revision)) {
157
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134 insp = new ContentPipe(sink, 0);
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135 } else if (metadata.known(revision)) {
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136 insp = new ContentPipe(sink, metadata.dataOffset(revision));
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137 } else {
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138 // do not know if there's metadata
215
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139 insp = new MetadataContentPipe(sink, metadata, getPath());
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140 }
157
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141 insp.checkCancelled();
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142 super.content.iterate(revision, revision, true, insp);
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143 try {
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144 insp.checkFailed();
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145 } catch (HgDataStreamException ex) {
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146 throw ex;
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147 } catch (HgException ex) {
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148 // shall not happen, unless we changed ContentPipe or its subclass
215
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149 throw new HgDataStreamException(getPath(), ex.getClass().getName(), ex);
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150 }
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151 }
157
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152
129
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153 public void history(HgChangelog.Inspector inspector) {
135
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154 history(0, getLastRevision(), inspector);
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155 }
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156
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157 public void history(int start, int end, HgChangelog.Inspector inspector) {
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158 if (!exists()) {
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159 throw new IllegalStateException("Can't get history of invalid repository file node");
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160 }
135
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161 final int last = getLastRevision();
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162 if (start < 0 || start > last) {
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163 throw new IllegalArgumentException();
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164 }
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165 if (end == TIP) {
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166 end = last;
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167 } else if (end < start || end > last) {
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168 throw new IllegalArgumentException();
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169 }
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170 final int[] commitRevisions = new int[end - start + 1];
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171 RevlogStream.Inspector insp = new RevlogStream.Inspector() {
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172 int count = 0;
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173
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174 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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175 commitRevisions[count++] = linkRevision;
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176 }
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177 };
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178 content.iterate(start, end, false, insp);
233
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179 final HgChangelog changelog = getRepo().getChangelog();
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180 // changelog.range(inspector, commitRevisions); not effective when changes are sparse and far from each other
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181 //
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182 final int HistoricallyCloseCommits = 50; // XXX perhaps, shall increase/decrease based on changelog.revisionCount()
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183 // (huge changelog => memory mapped files, each file re-read is more expensive than iterating over records in one read?
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184 //
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185 // try short sequences on neighboring revisions.
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186 for (int i = 0; i < commitRevisions.length; ) {
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187 int x = i;
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188 i++;
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189 boolean sequential = true;
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190 while (i < commitRevisions.length) {
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191 if (commitRevisions[i] == commitRevisions[i-1] + 1) {
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192 i++;
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193 } else if (commitRevisions[i] - commitRevisions[i-1] < HistoricallyCloseCommits) {
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194 // close enough, but not sequential
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195 sequential = false;
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196 i++;
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197 } else {
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198 break;
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199 }
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200 }
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201 if (sequential) {
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202 // commitRevisions[x..i-1] are sequential
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203 changelog.range(commitRevisions[x], commitRevisions[i-1], inspector);
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204 } else {
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205 int[] revs = new int[i-x];
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206 System.arraycopy(commitRevisions, x, revs, 0, i-x);
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207 changelog.range(inspector, revs);
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208 }
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209 }
3
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210 }
88
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211
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212 // for a given local revision of the file, find out local revision in the changelog
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213 public int getChangesetLocalRevision(int revision) {
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214 return content.linkRevision(revision);
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215 }
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216
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217 public Nodeid getChangesetRevision(Nodeid nid) {
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218 int changelogRevision = getChangesetLocalRevision(getLocalRevision(nid));
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219 return getRepo().getChangelog().getRevision(changelogRevision);
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220 }
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221
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222 public boolean isCopy() throws HgDataStreamException {
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223 if (metadata == null || !metadata.checked(0)) {
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224 // content() always initializes metadata.
163
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225 // FIXME this is expensive way to find out metadata, distinct RevlogStream.Iterator would be better.
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226 // Alternatively, may parameterize MetadataContentPipe to do prepare only.
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227 // For reference, when throwing CancelledException, hg status -A --rev 3:80 takes 70 ms
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228 // however, if we just consume buffer instead (buffer.position(buffer.limit()), same command takes ~320ms
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229 // (compared to command-line counterpart of 190ms)
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230 try {
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231 content(0, new ByteChannel() { // No-op channel
163
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232 public int write(ByteBuffer buffer) throws IOException, CancelledException {
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233 // pretend we consumed whole buffer
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234 // int rv = buffer.remaining();
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235 // buffer.position(buffer.limit());
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236 // return rv;
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237 throw new CancelledException();
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238 }
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239 });
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240 } catch (CancelledException ex) {
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241 // it's ok, we did that
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242 } catch (Exception ex) {
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243 throw new HgDataStreamException(getPath(), "Can't initialize metadata", ex);
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244 }
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245 }
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246 if (!metadata.known(0)) {
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247 return false;
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248 }
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249 return metadata.find(0, "copy") != null;
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250 }
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251
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252 public Path getCopySourceName() throws HgDataStreamException {
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253 if (isCopy()) {
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254 return Path.create(metadata.find(0, "copy"));
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255 }
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256 throw new UnsupportedOperationException(); // XXX REVISIT, think over if Exception is good (clients would check isCopy() anyway, perhaps null is sufficient?)
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257 }
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258
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259 public Nodeid getCopySourceRevision() throws HgDataStreamException {
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260 if (isCopy()) {
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261 return Nodeid.fromAscii(metadata.find(0, "copyrev")); // XXX reuse/cache Nodeid
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262 }
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263 throw new UnsupportedOperationException();
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264 }
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265
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266 @Override
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267 public String toString() {
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268 StringBuilder sb = new StringBuilder(getClass().getSimpleName());
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269 sb.append('(');
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270 sb.append(getPath());
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271 sb.append(')');
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272 return sb.toString();
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273 }
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274
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275 private static final class MetadataEntry {
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276 private final String entry;
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277 private final int valueStart;
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278 /*package-local*/MetadataEntry(String key, String value) {
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279 entry = key + value;
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280 valueStart = key.length();
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281 }
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282 /*package-local*/boolean matchKey(String key) {
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283 return key.length() == valueStart && entry.startsWith(key);
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284 }
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285 // uncomment once/if needed
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286 // public String key() {
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287 // return entry.substring(0, valueStart);
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288 // }
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289 public String value() {
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290 return entry.substring(valueStart);
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291 }
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292 }
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293
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294 private static class Metadata {
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295 // XXX sparse array needed
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296 private final TreeMap<Integer, Integer> offsets = new TreeMap<Integer, Integer>();
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297 private final TreeMap<Integer, MetadataEntry[]> entries = new TreeMap<Integer, MetadataEntry[]>();
134
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298
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299 private final Integer NONE = new Integer(-1); // do not duplicate -1 integers at least within single file (don't want statics)
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300
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301 // true when there's metadata for given revision
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302 boolean known(int revision) {
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303 Integer i = offsets.get(revision);
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304 return i != null && NONE != i;
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305 }
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306
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307 // true when revision has been checked for metadata presence.
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308 public boolean checked(int revision) {
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309 return offsets.containsKey(revision);
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310 }
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311
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312 // true when revision has been checked and found not having any metadata
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313 boolean none(int revision) {
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314 Integer i = offsets.get(revision);
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315 return i == NONE;
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316 }
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317
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318 // mark revision as having no metadata.
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319 void recordNone(int revision) {
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320 Integer i = offsets.get(revision);
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321 if (i == NONE) {
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322 return; // already there
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323 }
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324 if (i != null) {
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325 throw new IllegalStateException(String.format("Trying to override Metadata state for revision %d (known offset: %d)", revision, i));
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326 }
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327 offsets.put(revision, NONE);
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328 }
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329
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330 // since this is internal class, callers are supposed to ensure arg correctness (i.e. ask known() before)
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331 int dataOffset(int revision) {
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332 return offsets.get(revision);
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333 }
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334 void add(int revision, int dataOffset, Collection<MetadataEntry> e) {
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335 assert !offsets.containsKey(revision);
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336 offsets.put(revision, dataOffset);
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337 entries.put(revision, e.toArray(new MetadataEntry[e.size()]));
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338 }
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339 String find(int revision, String key) {
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340 for (MetadataEntry me : entries.get(revision)) {
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341 if (me.matchKey(key)) {
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342 return me.value();
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343 }
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344 }
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345 return null;
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346 }
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347 }
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348
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349 private static class MetadataContentPipe extends ContentPipe {
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350
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351 private final Metadata metadata;
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352 private final Path fname; // need this only for error reporting
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353
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354 public MetadataContentPipe(ByteChannel sink, Metadata _metadata, Path file) {
157
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355 super(sink, 0);
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356 metadata = _metadata;
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357 fname = file;
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358 }
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359
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360 @Override
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361 protected void prepare(int revisionNumber, DataAccess da) throws HgException, IOException {
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362 final int daLength = da.length();
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363 if (daLength < 4 || da.readByte() != 1 || da.readByte() != 10) {
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364 metadata.recordNone(revisionNumber);
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365 da.reset();
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366 return;
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367 }
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368 int lastEntryStart = 2;
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369 int lastColon = -1;
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370 ArrayList<MetadataEntry> _metadata = new ArrayList<MetadataEntry>();
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371 // XXX in fact, need smth like ByteArrayBuilder, similar to StringBuilder,
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372 // which can't be used here because we can't convert bytes to chars as we read them
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373 // (there might be multi-byte encoding), and we need to collect all bytes before converting to string
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374 ByteArrayOutputStream bos = new ByteArrayOutputStream();
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375 String key = null, value = null;
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376 boolean byteOne = false;
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377 for (int i = 2; i < daLength; i++) {
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378 byte b = da.readByte();
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379 if (b == '\n') {
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380 if (byteOne) { // i.e. \n follows 1
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381 lastEntryStart = i+1;
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382 // XXX is it possible to have here incomplete key/value (i.e. if last pair didn't end with \n)
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383 break;
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384 }
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385 if (key == null || lastColon == -1 || i <= lastColon) {
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386 throw new IllegalStateException(); // FIXME log instead and record null key in the metadata. Ex just to fail fast during dev
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387 }
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388 value = new String(bos.toByteArray()).trim();
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389 bos.reset();
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390 _metadata.add(new MetadataEntry(key, value));
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391 key = value = null;
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392 lastColon = -1;
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393 lastEntryStart = i+1;
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394 continue;
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395 }
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396 // byteOne has to be consumed up to this line, if not jet, consume it
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397 if (byteOne) {
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398 // insert 1 we've read on previous step into the byte builder
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399 bos.write(1);
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400 // fall-through to consume current byte
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401 byteOne = false;
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402 }
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403 if (b == (int) ':') {
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404 assert value == null;
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405 key = new String(bos.toByteArray());
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406 bos.reset();
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407 lastColon = i;
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408 } else if (b == 1) {
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409 byteOne = true;
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410 } else {
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411 bos.write(b);
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412 }
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413 }
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414 _metadata.trimToSize();
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415 metadata.add(revisionNumber, lastEntryStart, _metadata);
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416 if (da.isEmpty() || !byteOne) {
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417 throw new HgDataStreamException(fname, String.format("Metadata for revision %d is not closed properly", revisionNumber), null);
157
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418 }
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419 // da is in prepared state (i.e. we consumed all bytes up to metadata end).
17
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420 }
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421 }
2
08db726a0fb7 Shaping out low-level Hg structures
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422 }