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annotate src/org/tmatesoft/hg/repo/HgDataFile.java @ 255:5a6ab50b4cbf

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Improve memory footprint of tag collection (about 14 Mb saved for cpython repo without HashMap.Entry and Entry[])
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 16 Aug 2011 14:33:11 +0200
parents 2fb439375ddc
children 6d1804fe0ed7
rev   line source
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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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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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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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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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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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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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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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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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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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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 }
2
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130 }
115
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131
157
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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?*/
237
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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 }
115
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163 }
22
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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-
237
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167 public void content(int revision, ByteChannel sink) throws HgDataStreamException, CancelledException {
78
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168 if (revision == TIP) {
135
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169 revision = getLastRevision();
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170 }
157
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171 if (revision == WORKING_COPY) {
237
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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)
157
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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) {
148
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178 throw new IllegalArgumentException(String.valueOf(revision));
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179 }
157
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180 if (sink == null) {
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181 throw new IllegalArgumentException();
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182 }
134
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183 if (metadata == null) {
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184 metadata = new Metadata();
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185 }
157
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186 ContentPipe insp;
134
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187 if (metadata.none(revision)) {
157
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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
215
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193 insp = new MetadataContentPipe(sink, metadata, getPath());
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194 }
157
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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 {
237
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198 insp.checkFailed(); // XXX is there real need to throw IOException from ContentPipe?
157
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199 } catch (HgDataStreamException ex) {
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200 throw ex;
237
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201 } catch (IOException ex) {
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202 throw new HgDataStreamException(getPath(), ex);
157
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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 }
157
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208
129
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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) {
242
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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();
242
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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 }
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.
163
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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
163
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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 });
163
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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) {
134
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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 }
134
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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;
215
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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) {
157
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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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parents: 51 148
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446 byteOne = true;
d5268ca7715b Merged branch wrap-data-access into default for resource-friendly data access. Updated API to promote that friendliness to clients (channels, not byte[]). More exceptions
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parents: 51 148
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447 } else {
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448 bos.write(b);
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parents: 51 148
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449 }
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parents: 51 148
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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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454 throw new HgDataStreamException(fname, String.format("Metadata for revision %d is not closed properly", revisionNumber), null);
157
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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).
17
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457 }
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458 }
2
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459 }