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annotate src/org/tmatesoft/hg/internal/FNCacheFile.java @ 709:497e697636fc

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Report merged lines as changed block if possible, not as a sequence of added/deleted blocks. To facilitate access to merge parent lines AddBlock got mergeLineAt() method that reports index of the line in the second parent (if any), while insertedAt() has been changed to report index in the first parent always
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 21 Aug 2013 16:23:27 +0200
parents fba85bc1dfb8
children
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.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 }