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annotate src/org/tmatesoft/hg/repo/HgDataFile.java @ 239:df9d2854d3d6

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Initial access to subrepositories
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 16 Jun 2011 04:23:51 +0200
parents 6e1373b54e9b
children 29231022fec8
rev   line source
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1 /*
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2 * Copyright (c) 2010-2011 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.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.File;
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24 import java.io.FileInputStream;
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25 import java.io.IOException;
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26 import java.nio.ByteBuffer;
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27 import java.nio.channels.FileChannel;
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28 import java.util.ArrayList;
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29 import java.util.Collection;
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30 import java.util.TreeMap;
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32 import org.tmatesoft.hg.core.HgDataStreamException;
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33 import org.tmatesoft.hg.core.HgException;
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34 import org.tmatesoft.hg.core.Nodeid;
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35 import org.tmatesoft.hg.internal.DataAccess;
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36 import org.tmatesoft.hg.internal.FilterByteChannel;
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37 import org.tmatesoft.hg.internal.RevlogStream;
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38 import org.tmatesoft.hg.util.ByteChannel;
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39 import org.tmatesoft.hg.util.CancelSupport;
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40 import org.tmatesoft.hg.util.CancelledException;
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41 import org.tmatesoft.hg.util.Path;
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42 import org.tmatesoft.hg.util.ProgressSupport;
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43
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46 /**
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47 * ? name:HgFileNode?
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48 *
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49 * @author Artem Tikhomirov
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50 * @author TMate Software Ltd.
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51 */
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52 public class HgDataFile extends Revlog {
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53
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54 // absolute from repo root?
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55 // slashes, unix-style?
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56 // repo location agnostic, just to give info to user, not to access real storage
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57 private final Path path;
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58 private Metadata metadata; // get initialized on first access to file content.
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60 /*package-local*/HgDataFile(HgRepository hgRepo, Path filePath, RevlogStream content) {
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61 super(hgRepo, content);
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62 path = filePath;
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63 }
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65 /*package-local*/HgDataFile(HgRepository hgRepo, Path filePath) {
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66 super(hgRepo);
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67 path = filePath;
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68 }
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70 // 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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71 // it might be confused with files existed before but lately removed.
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72 public boolean exists() {
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73 return content != null; // XXX need better impl
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74 }
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76 // human-readable (i.e. "COPYING", not "store/data/_c_o_p_y_i_n_g.i")
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77 public Path getPath() {
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78 return path; // hgRepo.backresolve(this) -> name? In this case, what about hashed long names?
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79 }
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81 public int length(Nodeid nodeid) {
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82 return content.dataLength(getLocalRevision(nodeid));
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83 }
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85 /**
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86 * Reads content of the file from working directory. If file present in the working directory, its actual content without
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87 * any filters is supplied through the sink. If file does not exist in the working dir, this method provides content of a file
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88 * as if it would be refreshed in the working copy, i.e. its corresponding revision
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89 * (XXX according to dirstate? file tip?) is read from the repository, and filters repo -> working copy get applied.
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90 *
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91 * @param sink where to pipe content to
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92 * @throws HgDataStreamException to indicate troubles reading repository file
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93 * @throws CancelledException if operation was cancelled
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94 */
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95 public void workingCopy(ByteChannel sink) throws HgDataStreamException, CancelledException {
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96 File f = getRepo().getFile(this);
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97 if (f.exists()) {
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98 final CancelSupport cs = CancelSupport.Factory.get(sink);
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99 final ProgressSupport progress = ProgressSupport.Factory.get(sink);
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100 final long flength = f.length();
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101 final int bsize = (int) Math.min(flength, 32*1024);
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102 progress.start((int) (flength > Integer.MAX_VALUE ? flength >>> 15 /*32 kb buf size*/ : flength));
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103 ByteBuffer buf = ByteBuffer.allocate(bsize);
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104 FileChannel fc = null;
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105 try {
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106 fc = new FileInputStream(f).getChannel();
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107 while (fc.read(buf) != -1) {
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108 cs.checkCancelled();
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109 buf.flip();
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110 int consumed = sink.write(buf);
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111 progress.worked(flength > Integer.MAX_VALUE ? 1 : consumed);
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112 buf.compact();
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113 }
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114 } catch (IOException ex) {
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115 throw new HgDataStreamException(getPath(), ex);
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116 } finally {
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117 progress.done();
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118 if (fc != null) {
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119 try {
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120 fc.close();
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121 } catch (IOException ex) {
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122 ex.printStackTrace();
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123 }
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124 }
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125 }
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126 } else {
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127 contentWithFilters(TIP, sink);
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128 }
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129 }
115
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130
157
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131 // public void content(int revision, ByteChannel sink, boolean applyFilters) throws HgDataStreamException, IOException, CancelledException {
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132 // byte[] content = content(revision);
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133 // final CancelSupport cancelSupport = CancelSupport.Factory.get(sink);
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134 // final ProgressSupport progressSupport = ProgressSupport.Factory.get(sink);
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135 // ByteBuffer buf = ByteBuffer.allocate(512);
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136 // int left = content.length;
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137 // progressSupport.start(left);
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138 // int offset = 0;
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139 // cancelSupport.checkCancelled();
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140 // ByteChannel _sink = applyFilters ? new FilterByteChannel(sink, getRepo().getFiltersFromRepoToWorkingDir(getPath())) : sink;
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141 // do {
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142 // buf.put(content, offset, Math.min(left, buf.remaining()));
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143 // buf.flip();
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144 // cancelSupport.checkCancelled();
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145 // // XXX I may not rely on returned number of bytes but track change in buf position instead.
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146 // int consumed = _sink.write(buf);
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147 // buf.compact();
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148 // offset += consumed;
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149 // left -= consumed;
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150 // progressSupport.worked(consumed);
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151 // } while (left > 0);
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152 // progressSupport.done(); // XXX shall specify whether #done() is invoked always or only if completed successfully.
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153 // }
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154
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155 /*XXX not sure distinct method contentWithFilters() is the best way to do, perhaps, callers shall add filters themselves?*/
237
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156 public void contentWithFilters(int revision, ByteChannel sink) throws HgDataStreamException, CancelledException {
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157 if (revision == WORKING_COPY) {
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158 workingCopy(sink); // pass un-mangled sink
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159 } else {
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160 content(revision, new FilterByteChannel(sink, getRepo().getFiltersFromRepoToWorkingDir(getPath())));
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161 }
115
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162 }
22
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163
78
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164 // for data files need to check heading of the file content for possible metadata
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165 // @see http://mercurial.selenic.com/wiki/FileFormats#data.2BAC8-
237
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166 public void content(int revision, ByteChannel sink) throws HgDataStreamException, CancelledException {
78
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167 if (revision == TIP) {
135
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168 revision = getLastRevision();
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169 }
157
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170 if (revision == WORKING_COPY) {
237
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171 // sink is supposed to come into workingCopy without filters
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172 // thus we shall not get here (into #content) from #contentWithFilters(WC)
157
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173 workingCopy(sink);
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174 return;
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175 }
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176 if (wrongLocalRevision(revision) || revision == BAD_REVISION) {
148
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177 throw new IllegalArgumentException(String.valueOf(revision));
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178 }
157
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179 if (sink == null) {
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180 throw new IllegalArgumentException();
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181 }
134
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182 if (metadata == null) {
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183 metadata = new Metadata();
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184 }
157
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185 ContentPipe insp;
134
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186 if (metadata.none(revision)) {
157
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187 insp = new ContentPipe(sink, 0);
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188 } else if (metadata.known(revision)) {
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189 insp = new ContentPipe(sink, metadata.dataOffset(revision));
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190 } else {
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191 // do not know if there's metadata
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192 insp = new MetadataContentPipe(sink, metadata, getPath());
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193 }
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194 insp.checkCancelled();
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195 super.content.iterate(revision, revision, true, insp);
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196 try {
237
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197 insp.checkFailed(); // XXX is there real need to throw IOException from ContentPipe?
157
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198 } catch (HgDataStreamException ex) {
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199 throw ex;
237
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200 } catch (IOException ex) {
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201 throw new HgDataStreamException(getPath(), ex);
157
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202 } catch (HgException ex) {
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203 // shall not happen, unless we changed ContentPipe or its subclass
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204 throw new HgDataStreamException(getPath(), ex.getClass().getName(), ex);
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205 }
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206 }
157
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207
129
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208 public void history(HgChangelog.Inspector inspector) {
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209 history(0, getLastRevision(), inspector);
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210 }
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211
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212 public void history(int start, int end, HgChangelog.Inspector inspector) {
3
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213 if (!exists()) {
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214 throw new IllegalStateException("Can't get history of invalid repository file node");
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215 }
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216 final int last = getLastRevision();
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217 if (start < 0 || start > last) {
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218 throw new IllegalArgumentException();
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219 }
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220 if (end == TIP) {
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221 end = last;
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222 } else if (end < start || end > last) {
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223 throw new IllegalArgumentException();
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224 }
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225 final int[] commitRevisions = new int[end - start + 1];
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226 RevlogStream.Inspector insp = new RevlogStream.Inspector() {
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227 int count = 0;
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228
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229 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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230 commitRevisions[count++] = linkRevision;
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231 }
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232 };
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233 content.iterate(start, end, false, insp);
233
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234 final HgChangelog changelog = getRepo().getChangelog();
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235 // changelog.range(inspector, commitRevisions); not effective when changes are sparse and far from each other
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236 //
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237 final int HistoricallyCloseCommits = 50; // XXX perhaps, shall increase/decrease based on changelog.revisionCount()
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238 // (huge changelog => memory mapped files, each file re-read is more expensive than iterating over records in one read?
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239 //
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240 // try short sequences on neighboring revisions.
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241 for (int i = 0; i < commitRevisions.length; ) {
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242 int x = i;
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243 i++;
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244 boolean sequential = true;
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245 while (i < commitRevisions.length) {
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246 if (commitRevisions[i] == commitRevisions[i-1] + 1) {
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247 i++;
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248 } else if (commitRevisions[i] - commitRevisions[i-1] < HistoricallyCloseCommits) {
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249 // close enough, but not sequential
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250 sequential = false;
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251 i++;
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252 } else {
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253 break;
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254 }
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255 }
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256 if (sequential) {
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257 // commitRevisions[x..i-1] are sequential
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258 changelog.range(commitRevisions[x], commitRevisions[i-1], inspector);
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259 } else {
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260 int[] revs = new int[i-x];
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261 System.arraycopy(commitRevisions, x, revs, 0, i-x);
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262 changelog.range(inspector, revs);
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263 }
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264 }
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265 }
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266
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267 // for a given local revision of the file, find out local revision in the changelog
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268 public int getChangesetLocalRevision(int revision) {
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269 return content.linkRevision(revision);
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270 }
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271
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272 public Nodeid getChangesetRevision(Nodeid nid) {
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273 int changelogRevision = getChangesetLocalRevision(getLocalRevision(nid));
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274 return getRepo().getChangelog().getRevision(changelogRevision);
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275 }
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276
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277 public boolean isCopy() throws HgDataStreamException {
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278 if (metadata == null || !metadata.checked(0)) {
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279 // content() always initializes metadata.
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280 // FIXME this is expensive way to find out metadata, distinct RevlogStream.Iterator would be better.
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281 // Alternatively, may parameterize MetadataContentPipe to do prepare only.
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282 // For reference, when throwing CancelledException, hg status -A --rev 3:80 takes 70 ms
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283 // however, if we just consume buffer instead (buffer.position(buffer.limit()), same command takes ~320ms
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284 // (compared to command-line counterpart of 190ms)
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285 try {
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286 content(0, new ByteChannel() { // No-op channel
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287 public int write(ByteBuffer buffer) throws IOException, CancelledException {
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288 // pretend we consumed whole buffer
163
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289 // int rv = buffer.remaining();
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290 // buffer.position(buffer.limit());
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291 // return rv;
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292 throw new CancelledException();
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293 }
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294 });
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295 } catch (CancelledException ex) {
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296 // it's ok, we did that
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297 } catch (Exception ex) {
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298 throw new HgDataStreamException(getPath(), "Can't initialize metadata", ex);
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299 }
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300 }
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301 if (!metadata.known(0)) {
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302 return false;
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303 }
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304 return metadata.find(0, "copy") != null;
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305 }
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306
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307 public Path getCopySourceName() throws HgDataStreamException {
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308 if (isCopy()) {
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309 return Path.create(metadata.find(0, "copy"));
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310 }
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311 throw new UnsupportedOperationException(); // XXX REVISIT, think over if Exception is good (clients would check isCopy() anyway, perhaps null is sufficient?)
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312 }
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313
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314 public Nodeid getCopySourceRevision() throws HgDataStreamException {
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315 if (isCopy()) {
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316 return Nodeid.fromAscii(metadata.find(0, "copyrev")); // XXX reuse/cache Nodeid
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317 }
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318 throw new UnsupportedOperationException();
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319 }
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320
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321 @Override
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322 public String toString() {
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323 StringBuilder sb = new StringBuilder(getClass().getSimpleName());
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324 sb.append('(');
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325 sb.append(getPath());
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326 sb.append(')');
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327 return sb.toString();
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328 }
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329
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330 private static final class MetadataEntry {
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331 private final String entry;
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332 private final int valueStart;
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333 /*package-local*/MetadataEntry(String key, String value) {
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334 entry = key + value;
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335 valueStart = key.length();
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336 }
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337 /*package-local*/boolean matchKey(String key) {
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338 return key.length() == valueStart && entry.startsWith(key);
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339 }
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340 // uncomment once/if needed
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341 // public String key() {
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342 // return entry.substring(0, valueStart);
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343 // }
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344 public String value() {
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345 return entry.substring(valueStart);
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346 }
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347 }
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348
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349 private static class Metadata {
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350 // XXX sparse array needed
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351 private final TreeMap<Integer, Integer> offsets = new TreeMap<Integer, Integer>();
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352 private final TreeMap<Integer, MetadataEntry[]> entries = new TreeMap<Integer, MetadataEntry[]>();
134
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353
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354 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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355
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356 // true when there's metadata for given revision
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357 boolean known(int revision) {
134
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358 Integer i = offsets.get(revision);
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359 return i != null && NONE != i;
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360 }
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361
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362 // true when revision has been checked for metadata presence.
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363 public boolean checked(int revision) {
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364 return offsets.containsKey(revision);
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365 }
134
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366
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367 // true when revision has been checked and found not having any metadata
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368 boolean none(int revision) {
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369 Integer i = offsets.get(revision);
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370 return i == NONE;
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371 }
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372
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373 // mark revision as having no metadata.
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374 void recordNone(int revision) {
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375 Integer i = offsets.get(revision);
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376 if (i == NONE) {
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377 return; // already there
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378 }
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379 if (i != null) {
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380 throw new IllegalStateException(String.format("Trying to override Metadata state for revision %d (known offset: %d)", revision, i));
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381 }
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382 offsets.put(revision, NONE);
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383 }
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384
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385 // since this is internal class, callers are supposed to ensure arg correctness (i.e. ask known() before)
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386 int dataOffset(int revision) {
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387 return offsets.get(revision);
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388 }
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389 void add(int revision, int dataOffset, Collection<MetadataEntry> e) {
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390 assert !offsets.containsKey(revision);
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391 offsets.put(revision, dataOffset);
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392 entries.put(revision, e.toArray(new MetadataEntry[e.size()]));
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393 }
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394 String find(int revision, String key) {
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395 for (MetadataEntry me : entries.get(revision)) {
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396 if (me.matchKey(key)) {
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397 return me.value();
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398 }
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399 }
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400 return null;
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401 }
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402 }
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403
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404 private static class MetadataContentPipe extends ContentPipe {
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405
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406 private final Metadata metadata;
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407 private final Path fname; // need this only for error reporting
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408
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409 public MetadataContentPipe(ByteChannel sink, Metadata _metadata, Path file) {
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410 super(sink, 0);
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411 metadata = _metadata;
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412 fname = file;
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413 }
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414
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415 @Override
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416 protected void prepare(int revisionNumber, DataAccess da) throws HgException, IOException {
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417 final int daLength = da.length();
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418 if (daLength < 4 || da.readByte() != 1 || da.readByte() != 10) {
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419 metadata.recordNone(revisionNumber);
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420 da.reset();
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421 return;
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422 }
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423 int lastEntryStart = 2;
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424 int lastColon = -1;
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425 ArrayList<MetadataEntry> _metadata = new ArrayList<MetadataEntry>();
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426 // XXX in fact, need smth like ByteArrayBuilder, similar to StringBuilder,
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427 // which can't be used here because we can't convert bytes to chars as we read them
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428 // (there might be multi-byte encoding), and we need to collect all bytes before converting to string
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429 ByteArrayOutputStream bos = new ByteArrayOutputStream();
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430 String key = null, value = null;
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431 boolean byteOne = false;
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432 for (int i = 2; i < daLength; i++) {
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433 byte b = da.readByte();
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434 if (b == '\n') {
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435 if (byteOne) { // i.e. \n follows 1
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436 lastEntryStart = i+1;
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437 // XXX is it possible to have here incomplete key/value (i.e. if last pair didn't end with \n)
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diff changeset
438 break;
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439 }
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440 if (key == null || lastColon == -1 || i <= lastColon) {
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441 throw new IllegalStateException(); // FIXME log instead and record null key in the metadata. Ex just to fail fast during dev
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442 }
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443 value = new String(bos.toByteArray()).trim();
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444 bos.reset();
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445 _metadata.add(new MetadataEntry(key, value));
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446 key = value = null;
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447 lastColon = -1;
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448 lastEntryStart = i+1;
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449 continue;
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450 }
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451 // byteOne has to be consumed up to this line, if not jet, consume it
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452 if (byteOne) {
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453 // insert 1 we've read on previous step into the byte builder
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454 bos.write(1);
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455 // fall-through to consume current byte
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456 byteOne = false;
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457 }
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458 if (b == (int) ':') {
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459 assert value == null;
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460 key = new String(bos.toByteArray());
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461 bos.reset();
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462 lastColon = i;
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463 } else if (b == 1) {
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464 byteOne = true;
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465 } else {
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466 bos.write(b);
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467 }
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parents: 51 148
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468 }
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469 _metadata.trimToSize();
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470 metadata.add(revisionNumber, lastEntryStart, _metadata);
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471 if (da.isEmpty() || !byteOne) {
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472 throw new HgDataStreamException(fname, String.format("Metadata for revision %d is not closed properly", revisionNumber), null);
157
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473 }
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474 // da is in prepared state (i.e. we consumed all bytes up to metadata end).
17
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475 }
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476 }
2
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477 }