Mercurial > jhg
annotate src/org/tmatesoft/hg/internal/FNCacheFile.java @ 686:f1f095e42555
Annotated file is not always changed in the latest changeset, need to find out last changest it was changed at (iow, diffed to with BlameHelper)
author | Artem Tikhomirov <tikhomirov.artem@gmail.com> |
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date | Thu, 25 Jul 2013 22:12:14 +0200 (2013-07-25) |
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1 /* |
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2 * Copyright (c) 2013 TMate Software Ltd |
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3 * |
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4 * This program is free software; you can redistribute it and/or modify |
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5 * it under the terms of the GNU General Public License as published by |
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6 * the Free Software Foundation; version 2 of the License. |
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7 * |
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8 * This program is distributed in the hope that it will be useful, |
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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11 * GNU General Public License for more details. |
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12 * |
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13 * For information on how to redistribute this software under |
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14 * the terms of a license other than GNU General Public License |
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15 * contact TMate Software at support@hg4j.com |
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16 */ |
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17 package org.tmatesoft.hg.internal; |
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18 |
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19 import static org.tmatesoft.hg.repo.HgRepositoryFiles.FNCache; |
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20 |
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21 import java.io.File; |
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22 import java.io.FileOutputStream; |
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23 import java.io.IOException; |
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24 import java.nio.ByteBuffer; |
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25 import java.nio.CharBuffer; |
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26 import java.nio.channels.FileChannel; |
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27 import java.util.ArrayList; |
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28 import java.util.List; |
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29 |
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30 import org.tmatesoft.hg.core.HgIOException; |
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31 import org.tmatesoft.hg.util.Path; |
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32 |
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33 /** |
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34 * Append-only fncache support |
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35 * |
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36 * <blockquote> |
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37 * The fncache file contains the paths of all filelog files in the store as encoded by mercurial.filelog.encodedir. The paths are separated by '\n' (LF). |
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38 * </blockquote> |
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39 * @see http://mercurial.selenic.com/wiki/fncacheRepoFormat |
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40 * |
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41 * |
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42 * @author Artem Tikhomirov |
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43 * @author TMate Software Ltd. |
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44 */ |
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45 public class FNCacheFile { |
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46 |
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47 private final Internals repo; |
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48 // private final List<Path> files; |
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49 private final List<Path> addedDotI; |
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50 private final List<Path> addedDotD; |
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51 private final FNCachePathHelper pathHelper; |
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52 |
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53 public FNCacheFile(Internals internalRepo) { |
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54 repo = internalRepo; |
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55 // files = new ArrayList<Path>(); |
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56 pathHelper = new FNCachePathHelper(); |
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57 addedDotI = new ArrayList<Path>(5); |
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58 addedDotD = new ArrayList<Path>(5); |
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59 } |
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60 |
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61 /* |
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62 * For append-only option, we don't care reading the original content |
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63 public void read(Path.Source pathFactory) throws IOException { |
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64 File f = fncacheFile(); |
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65 files.clear(); |
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66 if (!f.exists()) { |
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67 return; |
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68 } |
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69 ArrayList<String> entries = new ArrayList<String>(); |
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70 // names in fncache are in local encoding, shall translate to unicode |
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71 new LineReader(f, repo.getSessionContext().getLog(), repo.getFilenameEncoding()).read(new LineReader.SimpleLineCollector(), entries); |
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72 for (String e : entries) { |
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73 // XXX plain wrong, need either to decode paths and strip off .i/.d or (if keep names as is) change write() |
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74 files.add(pathFactory.path(e)); |
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75 } |
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76 } |
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77 */ |
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78 |
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79 public void write(Transaction tr) throws HgIOException { |
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80 if (addedDotI.isEmpty() && addedDotD.isEmpty()) { |
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81 return; |
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82 } |
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83 File f = repo.getRepositoryFile(FNCache); |
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84 f.getParentFile().mkdirs(); |
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85 final EncodingHelper fnEncoder = repo.buildFileNameEncodingHelper(); |
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86 ArrayList<CharBuffer> added = new ArrayList<CharBuffer>(); |
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87 for (Path p : addedDotI) { |
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88 added.add(CharBuffer.wrap(pathHelper.rewrite(p))); |
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89 } |
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90 for (Path p : addedDotD) { |
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91 // XXX FNCachePathHelper always return name of an index file, need to change it into a name of data file, |
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92 // although the approach (to replace last char) is depressingly awful |
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93 CharSequence cs = pathHelper.rewrite(p); |
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94 CharBuffer cb = CharBuffer.allocate(cs.length()); |
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95 cb.append(cs); |
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96 cb.put(cs.length()-1, 'd'); |
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97 cb.flip(); |
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98 added.add(cb); |
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99 } |
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100 FileOutputStream fos = null; |
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101 f = tr.prepare(f); |
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102 try { |
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103 fos = new FileOutputStream(f, true); |
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104 FileChannel fncacheFile = fos.getChannel(); |
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105 ByteBuffer lf = ByteBuffer.wrap(new byte[] { 0x0A }); |
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106 for (CharBuffer b : added) { |
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107 fncacheFile.write(fnEncoder.toFNCache(b)); |
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108 fncacheFile.write(lf); |
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109 lf.rewind(); |
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110 } |
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111 fncacheFile.force(true); |
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112 tr.done(f); |
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113 } catch (IOException ex) { |
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114 tr.failure(f, ex); |
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115 throw new HgIOException("Failed to write fncache", ex, f); |
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116 } finally { |
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117 new FileUtils(repo.getLog(), this).closeQuietly(fos, f); |
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118 } |
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119 |
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120 } |
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121 |
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122 public void addIndex(Path p) { |
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123 addedDotI.add(p); |
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124 } |
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125 |
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126 public void addData(Path p) { |
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127 addedDotD.add(p); |
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128 } |
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129 |
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130 /** |
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131 * Register new files with fncache if one is enabled for the repo, do nothing otherwise |
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132 */ |
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133 public static class Mediator { |
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134 private final Internals repo; |
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135 private FNCacheFile fncache; |
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136 private final Transaction tr; |
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137 |
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138 public Mediator(Internals internalRepo, Transaction transaction) { |
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139 repo = internalRepo; |
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140 tr = transaction; |
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141 } |
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142 |
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143 public void registerNew(Path f, RevlogStream rs) { |
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144 if (fncache != null || repo.fncacheInUse()) { |
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145 if (fncache == null) { |
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146 fncache = new FNCacheFile(repo); |
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147 } |
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148 fncache.addIndex(f); |
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149 if (!rs.isInlineData()) { |
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150 fncache.addData(f); |
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151 } |
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152 } |
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153 } |
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154 |
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155 public void complete() throws HgIOException { |
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156 if (fncache != null) { |
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157 fncache.write(tr); |
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158 } |
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159 } |
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160 } |
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161 } |