Mercurial > jhg

annotate src/org/tmatesoft/hg/internal/FNCacheFile.java @ 666:27a3ddedd6cc

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Added tag v1.2m1 for changeset dde18bc7053b
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 10 Jul 2013 20:22:07 +0200
parents ae2d439fbed3
children fba85bc1dfb8
rev   line source
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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.nio.charset.Charset;
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28 import java.util.ArrayList;
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29 import java.util.List;
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30
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31 import org.tmatesoft.hg.core.HgIOException;
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32 import org.tmatesoft.hg.util.Path;
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33
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34 /**
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35 * Append-only fncache support
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36 *
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37 * <blockquote>
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38 * 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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39 * </blockquote>
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40 * @see http://mercurial.selenic.com/wiki/fncacheRepoFormat
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41 *
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42 *
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43 * @author Artem Tikhomirov
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44 * @author TMate Software Ltd.
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45 */
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46 public class FNCacheFile {
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47
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48 private final Internals repo;
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49 // private final List<Path> files;
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50 private final List<Path> addedDotI;
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51 private final List<Path> addedDotD;
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52 private final FNCachePathHelper pathHelper;
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53
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54 public FNCacheFile(Internals internalRepo) {
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55 repo = internalRepo;
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56 // files = new ArrayList<Path>();
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57 pathHelper = new FNCachePathHelper();
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58 addedDotI = new ArrayList<Path>(5);
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59 addedDotD = new ArrayList<Path>(5);
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60 }
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61
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62 /*
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63 * For append-only option, we don't care reading the original content
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64 public void read(Path.Source pathFactory) throws IOException {
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65 File f = fncacheFile();
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66 files.clear();
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67 if (!f.exists()) {
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68 return;
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69 }
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70 ArrayList<String> entries = new ArrayList<String>();
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71 // names in fncache are in local encoding, shall translate to unicode
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72 new LineReader(f, repo.getSessionContext().getLog(), repo.getFilenameEncoding()).read(new LineReader.SimpleLineCollector(), entries);
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73 for (String e : entries) {
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74 // 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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75 files.add(pathFactory.path(e));
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76 }
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77 }
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78 */
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79
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80 public void write(Transaction tr) throws HgIOException {
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81 if (addedDotI.isEmpty() && addedDotD.isEmpty()) {
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82 return;
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83 }
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84 File f = repo.getRepositoryFile(FNCache);
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85 f.getParentFile().mkdirs();
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86 final Charset filenameEncoding = repo.getFilenameEncoding();
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87 ArrayList<CharBuffer> added = new ArrayList<CharBuffer>();
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88 for (Path p : addedDotI) {
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89 added.add(CharBuffer.wrap(pathHelper.rewrite(p)));
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90 }
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91 for (Path p : addedDotD) {
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92 // XXX FNCachePathHelper always return name of an index file, need to change it into a name of data file,
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93 // although the approach (to replace last char) is depressingly awful
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94 CharSequence cs = pathHelper.rewrite(p);
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95 CharBuffer cb = CharBuffer.allocate(cs.length());
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96 cb.append(cs);
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97 cb.put(cs.length()-1, 'd');
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98 cb.flip();
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99 added.add(cb);
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100 }
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101 FileOutputStream fos = null;
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102 f = tr.prepare(f);
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103 try {
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104 fos = new FileOutputStream(f, true);
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105 FileChannel fncacheFile = fos.getChannel();
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106 ByteBuffer lf = ByteBuffer.wrap(new byte[] { 0x0A });
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107 for (CharBuffer b : added) {
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108 fncacheFile.write(filenameEncoding.encode(b));
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109 fncacheFile.write(lf);
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110 lf.rewind();
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111 }
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112 fncacheFile.force(true);
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113 tr.done(f);
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114 } catch (IOException ex) {
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115 tr.failure(f, ex);
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116 throw new HgIOException("Failed to write fncache", ex, f);
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117 } finally {
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118 new FileUtils(repo.getLog(), this).closeQuietly(fos, f);
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119 }
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120
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121 }
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122
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123 public void addIndex(Path p) {
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124 addedDotI.add(p);
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125 }
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126
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127 public void addData(Path p) {
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128 addedDotD.add(p);
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129 }
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131 /**
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132 * Register new files with fncache if one is enabled for the repo, do nothing otherwise
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133 */
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134 public static class Mediator {
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135 private final Internals repo;
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136 private FNCacheFile fncache;
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137 private final Transaction tr;
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138
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139 public Mediator(Internals internalRepo, Transaction transaction) {
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140 repo = internalRepo;
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141 tr = transaction;
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142 }
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143
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144 public void registerNew(Path f, RevlogStream rs) {
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145 if (fncache != null || repo.fncacheInUse()) {
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146 if (fncache == null) {
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147 fncache = new FNCacheFile(repo);
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148 }
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149 fncache.addIndex(f);
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150 if (!rs.isInlineData()) {
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151 fncache.addData(f);
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152 }
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153 }
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154 }
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155
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156 public void complete() throws HgIOException {
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157 if (fncache != null) {
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158 fncache.write(tr);
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159 }
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160 }
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161 }
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162 }