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annotate src/org/tmatesoft/hg/internal/FNCacheFile.java @ 575:8bf184c9d733

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Issue 43: poor performance with InflaterDataAccess. Phase 1: test existing code, fix defects found
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 16 Apr 2013 16:59:59 +0200
parents 6ca3d0c5b4bc
children 5e0313485eef
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 java.io.File;
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20 import java.io.FileOutputStream;
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21 import java.io.IOException;
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22 import java.nio.charset.Charset;
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23 import java.util.ArrayList;
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24 import java.util.List;
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25
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26 import org.tmatesoft.hg.util.Path;
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27
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28 /**
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29 * Append-only fncache support
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30 *
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31 * <blockquote>
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32 * 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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33 * </blockquote>
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34 * @see http://mercurial.selenic.com/wiki/fncacheRepoFormat
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35 *
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36 *
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37 * @author Artem Tikhomirov
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38 * @author TMate Software Ltd.
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39 */
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40 public class FNCacheFile {
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41
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42 private final Internals repo;
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43 // private final List<Path> files;
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44 private List<Path> added;
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45
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46 public FNCacheFile(Internals internalRepo) {
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47 repo = internalRepo;
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48 // files = new ArrayList<Path>();
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49 }
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50
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51 /*
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52 * For append-only option, we don't care reading the original content
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53 public void read(Path.Source pathFactory) throws IOException {
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54 File f = fncacheFile();
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55 files.clear();
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56 if (!f.exists()) {
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57 return;
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58 }
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59 ArrayList<String> entries = new ArrayList<String>();
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60 // names in fncache are in local encoding, shall translate to unicode
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61 new LineReader(f, repo.getSessionContext().getLog(), repo.getFilenameEncoding()).read(new LineReader.SimpleLineCollector(), entries);
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62 for (String e : entries) {
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63 // FIXME plain wrong, need either to decode paths and strip off .i/.d or (if keep names as is) change write()
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64 files.add(pathFactory.path(e));
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65 }
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66 }
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67 */
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68
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69 public void write() throws IOException {
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70 if (added == null || added.isEmpty()) {
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71 return;
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72 }
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73 File f = fncacheFile();
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74 f.getParentFile().mkdirs();
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75 final Charset filenameEncoding = repo.getFilenameEncoding();
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76 FileOutputStream fncacheFile = new FileOutputStream(f, true);
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77 for (Path p : added) {
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78 String s = "data/" + p.toString() + ".i"; // TODO post-1.0 this is plain wrong. (a) need .d files, too; (b) what about dh/ location?
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79 fncacheFile.write(s.getBytes(filenameEncoding));
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80 fncacheFile.write(0x0A); // http://mercurial.selenic.com/wiki/fncacheRepoFormat
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81 }
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82 fncacheFile.close();
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83 }
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84
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85 public void add(Path p) {
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86 if (added == null) {
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87 added = new ArrayList<Path>();
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88 }
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89 added.add(p);
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90 }
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91
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92 private File fncacheFile() {
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93 return repo.getFileFromStoreDir("fncache");
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94 }
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95 }