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annotate src/org/tmatesoft/hg/internal/PathPool.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 12f668401613
children
rev   line source
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1 /*
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2 * Copyright (c) 2011-2012 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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19 import java.lang.ref.SoftReference;
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20 import java.util.WeakHashMap;
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21
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22 import org.tmatesoft.hg.util.Convertor;
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23 import org.tmatesoft.hg.util.Path;
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24 import org.tmatesoft.hg.util.PathRewrite;
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27 /**
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28 * Produces path from strings and caches (weakly) result for reuse
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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 class PathPool implements Path.Source, Convertor<Path> {
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34 private final WeakHashMap<CharSequence, SoftReference<Path>> cache;
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35 private final PathRewrite pathRewrite;
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37 public PathPool(PathRewrite rewrite) {
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38 pathRewrite = rewrite;
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39 cache = new WeakHashMap<CharSequence, SoftReference<Path>>();
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40 }
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41
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42 /*
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43 * (non-Javadoc)
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44 * @see org.tmatesoft.hg.util.Path.Source#path(java.lang.CharSequence)
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45 */
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46 public Path path(CharSequence p) {
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47 if (p instanceof Path) {
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48 return asPath((Path) p);
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49 }
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50 p = pathRewrite.rewrite(p);
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51 return get(p, true);
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52 }
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54 /*
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55 * (non-Javadoc)
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56 * @see org.tmatesoft.hg.util.Convertor#mangle(java.lang.Object)
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57 */
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58 public Path mangle(Path p) {
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59 return asPath(p);
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60 }
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61
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62 // pipes path object through cache to reuse instance, if possible
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63 // TODO unify with Pool<Path>
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64 private Path asPath(Path p) {
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65 CharSequence s = pathRewrite.rewrite(p.toString());
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66 // rewrite string, not path to avoid use of Path object as key
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67 // in case pathRewrite does nothing and returns supplied instance
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68 //
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69 Path cached = get(s, false);
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70 if (cached == null) {
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71 cache.put(s, new SoftReference<Path>(cached = p));
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72 }
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73 return cached;
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74 }
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76 // XXX what would be parent of an empty path?
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77 // Path shall have similar functionality
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78 public Path parent(Path path) {
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79 if (path.length() == 0) {
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80 throw new IllegalArgumentException();
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81 }
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82 for (int i = path.length() - 2 /*if path represents a dir, trailing char is slash, skip*/; i >= 0; i--) {
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83 if (path.charAt(i) == '/') {
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84 return get(path.subSequence(0, i+1).toString(), true);
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85 }
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86 }
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87 return get("", true);
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88 }
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90 // invoke when path pool is no longer in use, to ease gc work
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91 public void clear() {
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92 cache.clear();
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93 }
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95 private Path get(CharSequence p, boolean create) {
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96 SoftReference<Path> sr = cache.get(p);
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97 Path path = sr == null ? null : sr.get();
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98 if (path == null) {
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99 if (create) {
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100 path = Path.create(p);
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101 cache.put(p, new SoftReference<Path>(path));
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102 } else if (sr != null) {
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103 // cached path no longer used, clear cache entry - do not wait for RefQueue to step in
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104 cache.remove(p);
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105 }
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106 }
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107 return path;
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108 }
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109 }