Mercurial > jhg

annotate src/org/tmatesoft/hg/internal/FNCacheFile.java @ 681:4f93bbc73b64

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Do not instantiate thousands of small arrays(numerous readInt/readLong calls)
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Sun, 21 Jul 2013 17:48:05 +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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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 }