Mercurial > jhg
annotate src/org/tmatesoft/hg/repo/HgDataFile.java @ 266:0a2f445de774
Improve manifest parsing: reduce number of arrays instantiated for Nodeid
author | Artem Tikhomirov <tikhomirov.artem@gmail.com> |
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date | Fri, 19 Aug 2011 04:59:32 +0200 |
parents | 2fb439375ddc |
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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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18 |
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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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21 |
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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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31 import java.util.TreeMap; |
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32 |
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33 import org.tmatesoft.hg.core.HgDataStreamException; |
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34 import org.tmatesoft.hg.core.HgException; |
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35 import org.tmatesoft.hg.core.Nodeid; |
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36 import org.tmatesoft.hg.internal.DataAccess; |
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37 import org.tmatesoft.hg.internal.FilterByteChannel; |
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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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45 |
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46 |
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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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60 |
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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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65 |
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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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70 |
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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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76 |
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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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81 |
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82 public int length(Nodeid nodeid) { |
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83 return content.dataLength(getLocalRevision(nodeid)); |
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84 } |
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85 |
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86 /** |
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87 * Reads content of the file from working directory. If file present in the working directory, its actual content without |
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88 * 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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89 * as if it would be refreshed in the working copy, i.e. its corresponding revision |
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90 * (XXX according to dirstate? file tip?) is read from the repository, and filters repo -> working copy get applied. |
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91 * |
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92 * @param sink where to pipe content to |
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93 * @throws HgDataStreamException to indicate troubles reading repository file |
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94 * @throws CancelledException if operation was cancelled |
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95 */ |
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96 public void workingCopy(ByteChannel sink) throws HgDataStreamException, CancelledException { |
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97 File f = getRepo().getFile(this); |
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98 if (f.exists()) { |
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99 final CancelSupport cs = CancelSupport.Factory.get(sink); |
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100 final ProgressSupport progress = ProgressSupport.Factory.get(sink); |
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101 final long flength = f.length(); |
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102 final int bsize = (int) Math.min(flength, 32*1024); |
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103 progress.start((int) (flength > Integer.MAX_VALUE ? flength >>> 15 /*32 kb buf size*/ : flength)); |
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104 ByteBuffer buf = ByteBuffer.allocate(bsize); |
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105 FileChannel fc = null; |
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106 try { |
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107 fc = new FileInputStream(f).getChannel(); |
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108 while (fc.read(buf) != -1) { |
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109 cs.checkCancelled(); |
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110 buf.flip(); |
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111 int consumed = sink.write(buf); |
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112 progress.worked(flength > Integer.MAX_VALUE ? 1 : consumed); |
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113 buf.compact(); |
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114 } |
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115 } catch (IOException ex) { |
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116 throw new HgDataStreamException(getPath(), ex); |
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117 } finally { |
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118 progress.done(); |
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119 if (fc != null) { |
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120 try { |
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121 fc.close(); |
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122 } catch (IOException ex) { |
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123 ex.printStackTrace(); |
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124 } |
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125 } |
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126 } |
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127 } else { |
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128 contentWithFilters(TIP, sink); |
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129 } |
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130 } |
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131 |
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132 // public void content(int revision, ByteChannel sink, boolean applyFilters) throws HgDataStreamException, IOException, CancelledException { |
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133 // byte[] content = content(revision); |
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134 // final CancelSupport cancelSupport = CancelSupport.Factory.get(sink); |
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135 // final ProgressSupport progressSupport = ProgressSupport.Factory.get(sink); |
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136 // ByteBuffer buf = ByteBuffer.allocate(512); |
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137 // int left = content.length; |
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138 // progressSupport.start(left); |
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139 // int offset = 0; |
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140 // cancelSupport.checkCancelled(); |
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141 // ByteChannel _sink = applyFilters ? new FilterByteChannel(sink, getRepo().getFiltersFromRepoToWorkingDir(getPath())) : sink; |
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142 // do { |
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143 // buf.put(content, offset, Math.min(left, buf.remaining())); |
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144 // buf.flip(); |
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145 // cancelSupport.checkCancelled(); |
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146 // // XXX I may not rely on returned number of bytes but track change in buf position instead. |
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147 // int consumed = _sink.write(buf); |
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148 // buf.compact(); |
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149 // offset += consumed; |
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150 // left -= consumed; |
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151 // progressSupport.worked(consumed); |
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152 // } while (left > 0); |
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153 // progressSupport.done(); // XXX shall specify whether #done() is invoked always or only if completed successfully. |
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154 // } |
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155 |
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156 /*XXX not sure distinct method contentWithFilters() is the best way to do, perhaps, callers shall add filters themselves?*/ |
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157 public void contentWithFilters(int revision, ByteChannel sink) throws HgDataStreamException, CancelledException { |
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158 if (revision == WORKING_COPY) { |
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159 workingCopy(sink); // pass un-mangled sink |
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160 } else { |
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161 content(revision, new FilterByteChannel(sink, getRepo().getFiltersFromRepoToWorkingDir(getPath()))); |
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162 } |
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163 } |
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164 |
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165 // for data files need to check heading of the file content for possible metadata |
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166 // @see http://mercurial.selenic.com/wiki/FileFormats#data.2BAC8- |
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167 public void content(int revision, ByteChannel sink) throws HgDataStreamException, CancelledException { |
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168 if (revision == TIP) { |
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169 revision = getLastRevision(); |
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170 } |
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171 if (revision == WORKING_COPY) { |
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172 // sink is supposed to come into workingCopy without filters |
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173 // thus we shall not get here (into #content) from #contentWithFilters(WC) |
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174 workingCopy(sink); |
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175 return; |
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176 } |
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177 if (wrongLocalRevision(revision) || revision == BAD_REVISION) { |
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178 throw new IllegalArgumentException(String.valueOf(revision)); |
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179 } |
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180 if (sink == null) { |
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181 throw new IllegalArgumentException(); |
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182 } |
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183 if (metadata == null) { |
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184 metadata = new Metadata(); |
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185 } |
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186 ContentPipe insp; |
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187 if (metadata.none(revision)) { |
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188 insp = new ContentPipe(sink, 0); |
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189 } else if (metadata.known(revision)) { |
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190 insp = new ContentPipe(sink, metadata.dataOffset(revision)); |
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191 } else { |
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192 // do not know if there's metadata |
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193 insp = new MetadataContentPipe(sink, metadata, getPath()); |
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194 } |
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195 insp.checkCancelled(); |
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196 super.content.iterate(revision, revision, true, insp); |
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197 try { |
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198 insp.checkFailed(); // XXX is there real need to throw IOException from ContentPipe? |
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199 } catch (HgDataStreamException ex) { |
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200 throw ex; |
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201 } catch (IOException ex) { |
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202 throw new HgDataStreamException(getPath(), ex); |
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203 } catch (HgException ex) { |
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204 // shall not happen, unless we changed ContentPipe or its subclass |
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205 throw new HgDataStreamException(getPath(), ex.getClass().getName(), ex); |
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206 } |
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207 } |
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208 |
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209 public void history(HgChangelog.Inspector inspector) { |
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210 history(0, getLastRevision(), inspector); |
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211 } |
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212 |
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213 public void history(int start, int end, HgChangelog.Inspector inspector) { |
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214 if (!exists()) { |
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215 throw new IllegalStateException("Can't get history of invalid repository file node"); |
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216 } |
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217 final int last = getLastRevision(); |
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218 if (start < 0 || start > last) { |
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219 throw new IllegalArgumentException(); |
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220 } |
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221 if (end == TIP) { |
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222 end = last; |
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223 } else if (end < start || end > last) { |
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224 throw new IllegalArgumentException(); |
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225 } |
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226 final int[] commitRevisions = new int[end - start + 1]; |
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227 final boolean[] needsSorting = { false }; |
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228 RevlogStream.Inspector insp = new RevlogStream.Inspector() { |
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229 int count = 0; |
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230 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) { |
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231 if (count > 0) { |
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232 if (commitRevisions[count -1] > linkRevision) { |
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233 needsSorting[0] = true; |
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234 } |
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235 } |
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236 commitRevisions[count++] = linkRevision; |
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237 } |
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238 }; |
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239 content.iterate(start, end, false, insp); |
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240 final HgChangelog changelog = getRepo().getChangelog(); |
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241 if (needsSorting[0]) { |
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242 // automatic tools (svnmerge?) produce unnatural file history |
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243 // (e.g. cpython/Lib/doctest.py, revision 164 points to cset 63509, 165 - to 38453) |
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244 Arrays.sort(commitRevisions); |
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245 } |
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246 changelog.rangeInternal(inspector, commitRevisions); |
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247 } |
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248 |
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249 // for a given local revision of the file, find out local revision in the changelog |
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250 public int getChangesetLocalRevision(int revision) { |
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251 return content.linkRevision(revision); |
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252 } |
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253 |
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254 public Nodeid getChangesetRevision(Nodeid nid) { |
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255 int changelogRevision = getChangesetLocalRevision(getLocalRevision(nid)); |
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256 return getRepo().getChangelog().getRevision(changelogRevision); |
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257 } |
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258 |
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259 public boolean isCopy() throws HgDataStreamException { |
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260 if (metadata == null || !metadata.checked(0)) { |
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261 // content() always initializes metadata. |
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262 // FIXME this is expensive way to find out metadata, distinct RevlogStream.Iterator would be better. |
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263 // Alternatively, may parameterize MetadataContentPipe to do prepare only. |
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264 // For reference, when throwing CancelledException, hg status -A --rev 3:80 takes 70 ms |
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265 // however, if we just consume buffer instead (buffer.position(buffer.limit()), same command takes ~320ms |
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266 // (compared to command-line counterpart of 190ms) |
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267 try { |
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268 content(0, new ByteChannel() { // No-op channel |
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269 public int write(ByteBuffer buffer) throws IOException, CancelledException { |
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270 // pretend we consumed whole buffer |
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271 // int rv = buffer.remaining(); |
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272 // buffer.position(buffer.limit()); |
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273 // return rv; |
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274 throw new CancelledException(); |
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275 } |
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276 }); |
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277 } catch (CancelledException ex) { |
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278 // it's ok, we did that |
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279 } catch (Exception ex) { |
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280 throw new HgDataStreamException(getPath(), "Can't initialize metadata", ex); |
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281 } |
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282 } |
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283 if (!metadata.known(0)) { |
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284 return false; |
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285 } |
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286 return metadata.find(0, "copy") != null; |
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287 } |
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288 |
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289 public Path getCopySourceName() throws HgDataStreamException { |
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290 if (isCopy()) { |
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291 return Path.create(metadata.find(0, "copy")); |
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292 } |
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293 throw new UnsupportedOperationException(); // XXX REVISIT, think over if Exception is good (clients would check isCopy() anyway, perhaps null is sufficient?) |
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294 } |
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295 |
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296 public Nodeid getCopySourceRevision() throws HgDataStreamException { |
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297 if (isCopy()) { |
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298 return Nodeid.fromAscii(metadata.find(0, "copyrev")); // XXX reuse/cache Nodeid |
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299 } |
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300 throw new UnsupportedOperationException(); |
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301 } |
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302 |
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303 @Override |
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304 public String toString() { |
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305 StringBuilder sb = new StringBuilder(getClass().getSimpleName()); |
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306 sb.append('('); |
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307 sb.append(getPath()); |
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308 sb.append(')'); |
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309 return sb.toString(); |
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310 } |
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311 |
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312 private static final class MetadataEntry { |
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313 private final String entry; |
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314 private final int valueStart; |
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315 /*package-local*/MetadataEntry(String key, String value) { |
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316 entry = key + value; |
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317 valueStart = key.length(); |
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318 } |
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319 /*package-local*/boolean matchKey(String key) { |
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320 return key.length() == valueStart && entry.startsWith(key); |
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321 } |
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322 // uncomment once/if needed |
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323 // public String key() { |
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324 // return entry.substring(0, valueStart); |
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325 // } |
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326 public String value() { |
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327 return entry.substring(valueStart); |
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328 } |
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329 } |
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330 |
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331 private static class Metadata { |
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332 // XXX sparse array needed |
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333 private final TreeMap<Integer, Integer> offsets = new TreeMap<Integer, Integer>(); |
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334 private final TreeMap<Integer, MetadataEntry[]> entries = new TreeMap<Integer, MetadataEntry[]>(); |
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335 |
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336 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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337 |
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338 // true when there's metadata for given revision |
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339 boolean known(int revision) { |
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340 Integer i = offsets.get(revision); |
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341 return i != null && NONE != i; |
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342 } |
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343 |
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344 // true when revision has been checked for metadata presence. |
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345 public boolean checked(int revision) { |
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346 return offsets.containsKey(revision); |
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347 } |
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348 |
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349 // true when revision has been checked and found not having any metadata |
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350 boolean none(int revision) { |
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351 Integer i = offsets.get(revision); |
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352 return i == NONE; |
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353 } |
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354 |
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355 // mark revision as having no metadata. |
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356 void recordNone(int revision) { |
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357 Integer i = offsets.get(revision); |
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358 if (i == NONE) { |
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359 return; // already there |
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360 } |
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361 if (i != null) { |
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362 throw new IllegalStateException(String.format("Trying to override Metadata state for revision %d (known offset: %d)", revision, i)); |
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363 } |
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364 offsets.put(revision, NONE); |
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365 } |
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366 |
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367 // since this is internal class, callers are supposed to ensure arg correctness (i.e. ask known() before) |
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368 int dataOffset(int revision) { |
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369 return offsets.get(revision); |
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370 } |
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371 void add(int revision, int dataOffset, Collection<MetadataEntry> e) { |
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372 assert !offsets.containsKey(revision); |
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373 offsets.put(revision, dataOffset); |
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374 entries.put(revision, e.toArray(new MetadataEntry[e.size()])); |
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375 } |
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376 String find(int revision, String key) { |
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377 for (MetadataEntry me : entries.get(revision)) { |
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378 if (me.matchKey(key)) { |
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379 return me.value(); |
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380 } |
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381 } |
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382 return null; |
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383 } |
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384 } |
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385 |
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386 private static class MetadataContentPipe extends ContentPipe { |
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387 |
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388 private final Metadata metadata; |
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389 private final Path fname; // need this only for error reporting |
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390 |
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391 public MetadataContentPipe(ByteChannel sink, Metadata _metadata, Path file) { |
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392 super(sink, 0); |
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393 metadata = _metadata; |
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394 fname = file; |
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395 } |
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396 |
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397 @Override |
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398 protected void prepare(int revisionNumber, DataAccess da) throws HgException, IOException { |
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399 final int daLength = da.length(); |
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400 if (daLength < 4 || da.readByte() != 1 || da.readByte() != 10) { |
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401 metadata.recordNone(revisionNumber); |
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402 da.reset(); |
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403 return; |
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404 } |
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405 int lastEntryStart = 2; |
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406 int lastColon = -1; |
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407 ArrayList<MetadataEntry> _metadata = new ArrayList<MetadataEntry>(); |
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408 // XXX in fact, need smth like ByteArrayBuilder, similar to StringBuilder, |
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409 // which can't be used here because we can't convert bytes to chars as we read them |
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410 // (there might be multi-byte encoding), and we need to collect all bytes before converting to string |
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411 ByteArrayOutputStream bos = new ByteArrayOutputStream(); |
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412 String key = null, value = null; |
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413 boolean byteOne = false; |
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414 for (int i = 2; i < daLength; i++) { |
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415 byte b = da.readByte(); |
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416 if (b == '\n') { |
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417 if (byteOne) { // i.e. \n follows 1 |
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418 lastEntryStart = i+1; |
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419 // XXX is it possible to have here incomplete key/value (i.e. if last pair didn't end with \n) |
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420 break; |
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421 } |
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422 if (key == null || lastColon == -1 || i <= lastColon) { |
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423 throw new IllegalStateException(); // FIXME log instead and record null key in the metadata. Ex just to fail fast during dev |
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424 } |
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425 value = new String(bos.toByteArray()).trim(); |
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426 bos.reset(); |
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427 _metadata.add(new MetadataEntry(key, value)); |
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428 key = value = null; |
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429 lastColon = -1; |
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430 lastEntryStart = i+1; |
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431 continue; |
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432 } |
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433 // byteOne has to be consumed up to this line, if not jet, consume it |
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434 if (byteOne) { |
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435 // insert 1 we've read on previous step into the byte builder |
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436 bos.write(1); |
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437 // fall-through to consume current byte |
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438 byteOne = false; |
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439 } |
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440 if (b == (int) ':') { |
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441 assert value == null; |
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442 key = new String(bos.toByteArray()); |
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443 bos.reset(); |
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444 lastColon = i; |
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445 } else if (b == 1) { |
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446 byteOne = true; |
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447 } else { |
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448 bos.write(b); |
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449 } |
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450 } |
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451 _metadata.trimToSize(); |
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452 metadata.add(revisionNumber, lastEntryStart, _metadata); |
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453 if (da.isEmpty() || !byteOne) { |
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41a778e3fd31
Issue 5: Facilities for progress and cancellation. More specific exceptions. Exceptions from callbacks as RuntimeException
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454 throw new HgDataStreamException(fname, String.format("Metadata for revision %d is not closed properly", revisionNumber), null); |
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455 } |
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456 // da is in prepared state (i.e. we consumed all bytes up to metadata end). |
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571e1b2cc3f7
Query file for its parents. Demo of recently added ignore and digest support from within cat cmd
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457 } |
571e1b2cc3f7
Query file for its parents. Demo of recently added ignore and digest support from within cat cmd
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458 } |
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Shaping out low-level Hg structures
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459 } |