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annotate src/org/tmatesoft/hg/repo/HgDataFile.java @ 276:6355ecda1f08

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Tailored Map implementation with int keys
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Mon, 29 Aug 2011 22:15:12 +0200
parents 6d1804fe0ed7
children 74e7493a042a
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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.Arrays;
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30 import java.util.Collection;
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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.IntMap;
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38 import org.tmatesoft.hg.internal.RevlogStream;
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39 import org.tmatesoft.hg.util.ByteChannel;
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40 import org.tmatesoft.hg.util.CancelSupport;
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41 import org.tmatesoft.hg.util.CancelledException;
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42 import org.tmatesoft.hg.util.Path;
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43 import org.tmatesoft.hg.util.ProgressSupport;
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44
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47 /**
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48 * ? name:HgFileNode?
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49 *
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50 * @author Artem Tikhomirov
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51 * @author TMate Software Ltd.
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52 */
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53 public class HgDataFile extends Revlog {
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54
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55 // absolute from repo root?
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56 // slashes, unix-style?
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57 // repo location agnostic, just to give info to user, not to access real storage
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58 private final Path path;
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59 private Metadata metadata; // get initialized on first access to file content.
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61 /*package-local*/HgDataFile(HgRepository hgRepo, Path filePath, RevlogStream content) {
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62 super(hgRepo, content);
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63 path = filePath;
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64 }
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66 /*package-local*/HgDataFile(HgRepository hgRepo, Path filePath) {
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67 super(hgRepo);
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68 path = filePath;
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69 }
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71 // 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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72 // it might be confused with files existed before but lately removed.
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73 public boolean exists() {
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74 return content != null; // XXX need better impl
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75 }
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77 // human-readable (i.e. "COPYING", not "store/data/_c_o_p_y_i_n_g.i")
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78 public Path getPath() {
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79 return path; // hgRepo.backresolve(this) -> name? In this case, what about hashed long names?
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80 }
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82 /**
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83 * @return size of the file content at the given revision
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84 */
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85 public int length(Nodeid nodeid) throws HgDataStreamException {
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86 return length(getLocalRevision(nodeid));
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88 }
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90 /**
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91 * @return size of the file content at the revision identified by local revision number.
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92 */
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93 public int length(int localRev) throws HgDataStreamException {
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94 if (metadata == null || !metadata.checked(localRev)) {
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95 checkAndRecordMetadata(localRev);
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96 }
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97 final int dataLen = content.dataLength(localRev);
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98 if (metadata.known(localRev)) {
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99 return dataLen - metadata.dataOffset(localRev);
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100 }
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101 return dataLen;
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102 }
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104 /**
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105 * Reads content of the file from working directory. If file present in the working directory, its actual content without
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106 * 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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107 * as if it would be refreshed in the working copy, i.e. its corresponding revision
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108 * (XXX according to dirstate? file tip?) is read from the repository, and filters repo -> working copy get applied.
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109 *
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110 * @param sink where to pipe content to
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111 * @throws HgDataStreamException to indicate troubles reading repository file
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112 * @throws CancelledException if operation was cancelled
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113 */
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114 public void workingCopy(ByteChannel sink) throws HgDataStreamException, CancelledException {
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115 File f = getRepo().getFile(this);
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116 if (f.exists()) {
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117 final CancelSupport cs = CancelSupport.Factory.get(sink);
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118 final ProgressSupport progress = ProgressSupport.Factory.get(sink);
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119 final long flength = f.length();
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120 final int bsize = (int) Math.min(flength, 32*1024);
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121 progress.start((int) (flength > Integer.MAX_VALUE ? flength >>> 15 /*32 kb buf size*/ : flength));
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122 ByteBuffer buf = ByteBuffer.allocate(bsize);
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123 FileChannel fc = null;
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124 try {
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125 fc = new FileInputStream(f).getChannel();
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126 while (fc.read(buf) != -1) {
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127 cs.checkCancelled();
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128 buf.flip();
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129 int consumed = sink.write(buf);
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130 progress.worked(flength > Integer.MAX_VALUE ? 1 : consumed);
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131 buf.compact();
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132 }
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133 } catch (IOException ex) {
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134 throw new HgDataStreamException(getPath(), ex);
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135 } finally {
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136 progress.done();
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137 if (fc != null) {
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138 try {
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139 fc.close();
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140 } catch (IOException ex) {
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141 ex.printStackTrace();
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142 }
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143 }
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144 }
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145 } else {
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146 contentWithFilters(TIP, sink);
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147 }
2
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148 }
115
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149
157
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150 // public void content(int revision, ByteChannel sink, boolean applyFilters) throws HgDataStreamException, IOException, CancelledException {
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151 // byte[] content = content(revision);
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152 // final CancelSupport cancelSupport = CancelSupport.Factory.get(sink);
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153 // final ProgressSupport progressSupport = ProgressSupport.Factory.get(sink);
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154 // ByteBuffer buf = ByteBuffer.allocate(512);
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155 // int left = content.length;
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156 // progressSupport.start(left);
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157 // int offset = 0;
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158 // cancelSupport.checkCancelled();
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159 // ByteChannel _sink = applyFilters ? new FilterByteChannel(sink, getRepo().getFiltersFromRepoToWorkingDir(getPath())) : sink;
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160 // do {
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161 // buf.put(content, offset, Math.min(left, buf.remaining()));
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162 // buf.flip();
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163 // cancelSupport.checkCancelled();
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164 // // XXX I may not rely on returned number of bytes but track change in buf position instead.
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165 // int consumed = _sink.write(buf);
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166 // buf.compact();
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167 // offset += consumed;
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168 // left -= consumed;
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169 // progressSupport.worked(consumed);
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170 // } while (left > 0);
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171 // progressSupport.done(); // XXX shall specify whether #done() is invoked always or only if completed successfully.
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172 // }
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173
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174 /*XXX not sure distinct method contentWithFilters() is the best way to do, perhaps, callers shall add filters themselves?*/
237
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175 public void contentWithFilters(int revision, ByteChannel sink) throws HgDataStreamException, CancelledException {
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176 if (revision == WORKING_COPY) {
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177 workingCopy(sink); // pass un-mangled sink
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178 } else {
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179 content(revision, new FilterByteChannel(sink, getRepo().getFiltersFromRepoToWorkingDir(getPath())));
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180 }
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181 }
22
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182
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183 // for data files need to check heading of the file content for possible metadata
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184 // @see http://mercurial.selenic.com/wiki/FileFormats#data.2BAC8-
237
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185 public void content(int revision, ByteChannel sink) throws HgDataStreamException, CancelledException {
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186 if (revision == TIP) {
135
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187 revision = getLastRevision();
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188 }
157
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189 if (revision == WORKING_COPY) {
237
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190 // sink is supposed to come into workingCopy without filters
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191 // thus we shall not get here (into #content) from #contentWithFilters(WC)
157
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192 workingCopy(sink);
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193 return;
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194 }
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195 if (wrongLocalRevision(revision) || revision == BAD_REVISION) {
148
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196 throw new IllegalArgumentException(String.valueOf(revision));
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197 }
157
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198 if (sink == null) {
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199 throw new IllegalArgumentException();
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200 }
134
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201 if (metadata == null) {
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202 metadata = new Metadata();
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203 }
157
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204 ContentPipe insp;
134
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205 if (metadata.none(revision)) {
157
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206 insp = new ContentPipe(sink, 0);
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207 } else if (metadata.known(revision)) {
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208 insp = new ContentPipe(sink, metadata.dataOffset(revision));
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209 } else {
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210 // do not know if there's metadata
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211 insp = new MetadataContentPipe(sink, metadata, getPath());
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212 }
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213 insp.checkCancelled();
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214 super.content.iterate(revision, revision, true, insp);
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215 try {
237
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216 insp.checkFailed(); // XXX is there real need to throw IOException from ContentPipe?
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217 } catch (HgDataStreamException ex) {
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218 throw ex;
237
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219 } catch (IOException ex) {
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220 throw new HgDataStreamException(getPath(), ex);
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221 } catch (HgException ex) {
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222 // shall not happen, unless we changed ContentPipe or its subclass
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223 throw new HgDataStreamException(getPath(), ex.getClass().getName(), ex);
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224 }
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225 }
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226
129
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227 public void history(HgChangelog.Inspector inspector) {
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228 history(0, getLastRevision(), inspector);
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229 }
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230
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231 public void history(int start, int end, HgChangelog.Inspector inspector) {
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232 if (!exists()) {
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233 throw new IllegalStateException("Can't get history of invalid repository file node");
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234 }
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235 final int last = getLastRevision();
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236 if (start < 0 || start > last) {
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237 throw new IllegalArgumentException();
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238 }
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239 if (end == TIP) {
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240 end = last;
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241 } else if (end < start || end > last) {
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242 throw new IllegalArgumentException();
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243 }
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244 final int[] commitRevisions = new int[end - start + 1];
242
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245 final boolean[] needsSorting = { false };
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246 RevlogStream.Inspector insp = new RevlogStream.Inspector() {
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247 int count = 0;
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248 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
242
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249 if (count > 0) {
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250 if (commitRevisions[count -1] > linkRevision) {
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251 needsSorting[0] = true;
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252 }
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253 }
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254 commitRevisions[count++] = linkRevision;
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255 }
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256 };
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257 content.iterate(start, end, false, insp);
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258 final HgChangelog changelog = getRepo().getChangelog();
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259 if (needsSorting[0]) {
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260 // automatic tools (svnmerge?) produce unnatural file history
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261 // (e.g. cpython/Lib/doctest.py, revision 164 points to cset 63509, 165 - to 38453)
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262 Arrays.sort(commitRevisions);
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263 }
245
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264 changelog.rangeInternal(inspector, commitRevisions);
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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)) {
275
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279 checkAndRecordMetadata(0);
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280 }
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281 if (!metadata.known(0)) {
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282 return false;
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283 }
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284 return metadata.find(0, "copy") != null;
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285 }
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286
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287 public Path getCopySourceName() throws HgDataStreamException {
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288 if (isCopy()) {
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289 return Path.create(metadata.find(0, "copy"));
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290 }
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291 throw new UnsupportedOperationException(); // XXX REVISIT, think over if Exception is good (clients would check isCopy() anyway, perhaps null is sufficient?)
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292 }
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293
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294 public Nodeid getCopySourceRevision() throws HgDataStreamException {
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295 if (isCopy()) {
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296 return Nodeid.fromAscii(metadata.find(0, "copyrev")); // XXX reuse/cache Nodeid
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297 }
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298 throw new UnsupportedOperationException();
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299 }
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300
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301 @Override
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302 public String toString() {
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303 StringBuilder sb = new StringBuilder(getClass().getSimpleName());
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304 sb.append('(');
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305 sb.append(getPath());
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306 sb.append(')');
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307 return sb.toString();
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308 }
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309
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310 private void checkAndRecordMetadata(int localRev) throws HgDataStreamException {
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311 // content() always initializes metadata.
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312 // FIXME this is expensive way to find out metadata, distinct RevlogStream.Iterator would be better.
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313 // Alternatively, may parameterize MetadataContentPipe to do prepare only.
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314 // For reference, when throwing CancelledException, hg status -A --rev 3:80 takes 70 ms
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315 // however, if we just consume buffer instead (buffer.position(buffer.limit()), same command takes ~320ms
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316 // (compared to command-line counterpart of 190ms)
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317 try {
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318 content(localRev, new ByteChannel() { // No-op channel
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319 public int write(ByteBuffer buffer) throws IOException, CancelledException {
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320 throw new CancelledException();
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321 }
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322 });
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323 } catch (CancelledException ex) {
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324 // it's ok, we did that
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325 } catch (Exception ex) {
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326 throw new HgDataStreamException(getPath(), "Can't initialize metadata", ex).setRevisionNumber(localRev);
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327 }
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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 private static class Record {
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351 public final int offset;
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352 public final MetadataEntry[] entries;
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353
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354 public Record(int off, MetadataEntry[] entr) {
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355 offset = off;
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356 entries = entr;
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357 }
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358 }
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359 // XXX sparse array needed
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360 private final IntMap<Record> entries = new IntMap<Record>(5);
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361
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362 private final Record NONE = new Record(-1, null); // don't want statics
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363
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364 // true when there's metadata for given revision
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365 boolean known(int revision) {
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366 Record i = entries.get(revision);
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367 return i != null && NONE != i;
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368 }
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369
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370 // true when revision has been checked for metadata presence.
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371 public boolean checked(int revision) {
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372 return entries.containsKey(revision);
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373 }
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374
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375 // true when revision has been checked and found not having any metadata
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376 boolean none(int revision) {
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377 Record i = entries.get(revision);
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378 return i == NONE;
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379 }
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380
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381 // mark revision as having no metadata.
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382 void recordNone(int revision) {
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383 Record i = entries.get(revision);
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384 if (i == NONE) {
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385 return; // already there
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386 }
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387 if (i != null) {
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388 throw new IllegalStateException(String.format("Trying to override Metadata state for revision %d (known offset: %d)", revision, i));
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389 }
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390 entries.put(revision, NONE);
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391 }
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392
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393 // since this is internal class, callers are supposed to ensure arg correctness (i.e. ask known() before)
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394 int dataOffset(int revision) {
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395 return entries.get(revision).offset;
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396 }
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397 void add(int revision, int dataOffset, Collection<MetadataEntry> e) {
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398 assert !entries.containsKey(revision);
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399 entries.put(revision, new Record(dataOffset, e.toArray(new MetadataEntry[e.size()])));
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400 }
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401
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402 String find(int revision, String key) {
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403 for (MetadataEntry me : entries.get(revision).entries) {
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404 if (me.matchKey(key)) {
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405 return me.value();
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406 }
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407 }
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408 return null;
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409 }
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410 }
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411
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412 private static class MetadataContentPipe extends ContentPipe {
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413
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414 private final Metadata metadata;
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415 private final Path fname; // need this only for error reporting
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416
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417 public MetadataContentPipe(ByteChannel sink, Metadata _metadata, Path file) {
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418 super(sink, 0);
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419 metadata = _metadata;
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420 fname = file;
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421 }
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422
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423 @Override
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424 protected void prepare(int revisionNumber, DataAccess da) throws HgException, IOException {
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425 final int daLength = da.length();
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426 if (daLength < 4 || da.readByte() != 1 || da.readByte() != 10) {
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427 metadata.recordNone(revisionNumber);
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428 da.reset();
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429 return;
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430 }
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431 int lastEntryStart = 2;
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432 int lastColon = -1;
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433 ArrayList<MetadataEntry> _metadata = new ArrayList<MetadataEntry>();
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434 // XXX in fact, need smth like ByteArrayBuilder, similar to StringBuilder,
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435 // which can't be used here because we can't convert bytes to chars as we read them
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436 // (there might be multi-byte encoding), and we need to collect all bytes before converting to string
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437 ByteArrayOutputStream bos = new ByteArrayOutputStream();
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438 String key = null, value = null;
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439 boolean byteOne = false;
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440 for (int i = 2; i < daLength; i++) {
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441 byte b = da.readByte();
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442 if (b == '\n') {
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443 if (byteOne) { // i.e. \n follows 1
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444 lastEntryStart = i+1;
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445 // XXX is it possible to have here incomplete key/value (i.e. if last pair didn't end with \n)
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446 break;
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447 }
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448 if (key == null || lastColon == -1 || i <= lastColon) {
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449 throw new IllegalStateException(); // FIXME log instead and record null key in the metadata. Ex just to fail fast during dev
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450 }
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451 value = new String(bos.toByteArray()).trim();
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452 bos.reset();
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453 _metadata.add(new MetadataEntry(key, value));
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454 key = value = null;
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455 lastColon = -1;
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456 lastEntryStart = i+1;
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457 continue;
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458 }
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459 // byteOne has to be consumed up to this line, if not jet, consume it
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460 if (byteOne) {
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461 // insert 1 we've read on previous step into the byte builder
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462 bos.write(1);
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463 // fall-through to consume current byte
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464 byteOne = false;
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465 }
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466 if (b == (int) ':') {
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467 assert value == null;
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468 key = new String(bos.toByteArray());
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469 bos.reset();
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470 lastColon = i;
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471 } else if (b == 1) {
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472 byteOne = true;
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473 } else {
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474 bos.write(b);
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475 }
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476 }
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477 metadata.add(revisionNumber, lastEntryStart, _metadata);
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478 if (da.isEmpty() || !byteOne) {
215
41a778e3fd31 Issue 5: Facilities for progress and cancellation. More specific exceptions. Exceptions from callbacks as RuntimeException
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479 throw new HgDataStreamException(fname, String.format("Metadata for revision %d is not closed properly", revisionNumber), null);
157
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480 }
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481 // da is in prepared state (i.e. we consumed all bytes up to metadata end).
17
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482 }
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483 }
2
08db726a0fb7 Shaping out low-level Hg structures
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484 }