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annotate src/org/tmatesoft/hg/internal/RevlogStreamFactory.java @ 606:5daa42067e7c

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Avoid mmap files when only few bytes are to be read
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 07 May 2013 14:16:35 +0200
parents e447384f3771
children e1b29756f901
rev   line source
591
e447384f3771 CommitFacility as internal class; refactored infrastructure around internals (access to RevlogStream)
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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
e447384f3771 CommitFacility as internal class; refactored infrastructure around internals (access to RevlogStream)
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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.IOException;
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21 import java.lang.ref.SoftReference;
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22 import java.util.HashMap;
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23
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24 import org.tmatesoft.hg.repo.HgInvalidControlFileException;
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25 import org.tmatesoft.hg.util.Path;
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26
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27 /**
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28 * Factory to create {@link RevlogStream RevlogStreams}, cache-capable.
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29 *
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30 * @author Artem Tikhomirov
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31 * @author TMate Software Ltd.
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32 */
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33 public final class RevlogStreamFactory {
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34
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35 private final Internals repo;
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36 private final HashMap<Path, SoftReference<RevlogStream>> streamsCache;
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37
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38
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39 public RevlogStreamFactory(Internals hgRepo, boolean shallCacheRevlogs) {
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40 repo = hgRepo;
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41 if (shallCacheRevlogs) {
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42 streamsCache = new HashMap<Path, SoftReference<RevlogStream>>();
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43 } else {
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44 streamsCache = null;
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45 }
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46 }
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47
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48 /**
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49 * Creates a stream for specified file, doesn't cache stream
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50 */
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51 /*package-local*/ RevlogStream create(File f) {
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52 return new RevlogStream(repo.getDataAccess(), f);
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53 }
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54
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55 /**
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56 * Perhaps, should be separate interface, like ContentLookup
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57 * @param path - normalized file name
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58 * @return <code>null</code> if path doesn't resolve to a existing file
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59 */
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60 /*package-local*/ RevlogStream resolveStoreFile(Path path) {
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61 final SoftReference<RevlogStream> ref = shallCacheRevlogs() ? streamsCache.get(path) : null;
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62 RevlogStream cached = ref == null ? null : ref.get();
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63 if (cached != null) {
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64 return cached;
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65 }
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66 File f = repo.getFileFromDataDir(path);
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67 if (f.exists()) {
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68 RevlogStream s = create(f);
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69 if (shallCacheRevlogs()) {
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70 streamsCache.put(path, new SoftReference<RevlogStream>(s));
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71 }
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72 return s;
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73 }
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74 return null;
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75 }
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76
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77 /*package-local*/ RevlogStream createStoreFile(Path path) throws HgInvalidControlFileException {
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78 File f = repo.getFileFromDataDir(path);
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79 try {
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80 if (!f.exists()) {
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81 f.getParentFile().mkdirs();
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82 f.createNewFile();
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83 }
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84 RevlogStream s = create(f);
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85 if (shallCacheRevlogs()) {
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86 streamsCache.put(path, new SoftReference<RevlogStream>(s));
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87 }
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88 return s;
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89 } catch (IOException ex) {
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90 throw new HgInvalidControlFileException("Can't create a file in the storage", ex, f);
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91 }
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92 }
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93
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94 private boolean shallCacheRevlogs() {
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95 return streamsCache != null;
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96 }
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97 }