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annotate src/org/tmatesoft/hg/util/PathPool.java @ 264:6bb5e7ed051a

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Optimize memory usage (reduce number of objects instantiated) when pooling file names and nodeids during manifest parsing
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 19 Aug 2011 03:36:25 +0200
parents 1792b37650f2
children a415fe296a50
rev   line source
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1 /*
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2 * Copyright (c) 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
102
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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.util;
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18
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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
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23 /**
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24 * Produces path from strings and caches result for reuse
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25 *
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26 * @author Artem Tikhomirov
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27 * @author TMate Software Ltd.
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28 */
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29 public class PathPool implements Path.Source {
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30 private final WeakHashMap<String, SoftReference<Path>> cache;
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31 private final PathRewrite pathRewrite;
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33 public PathPool(PathRewrite rewrite) {
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34 pathRewrite = rewrite;
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35 cache = new WeakHashMap<String, SoftReference<Path>>();
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36 }
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38 public Path path(String p) {
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39 p = pathRewrite.rewrite(p);
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40 return get(p, true);
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41 }
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43 // pipes path object through cache to reuse instance, if possible
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44 // TODO unify with Pool<Path>
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45 public Path path(Path p) {
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46 String s = pathRewrite.rewrite(p.toString());
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47 Path cached = get(s, false);
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48 if (cached == null) {
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49 cache.put(s, new SoftReference<Path>(cached = p));
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50 }
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51 return cached;
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52 }
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54 // XXX what would be parent of an empty path?
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55 // Path shall have similar functionality
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56 public Path parent(Path path) {
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57 if (path.length() == 0) {
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58 throw new IllegalArgumentException();
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59 }
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60 for (int i = path.length() - 2 /*if path represents a dir, trailing char is slash, skip*/; i >= 0; i--) {
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61 if (path.charAt(i) == '/') {
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62 return get(path.subSequence(0, i+1).toString(), true);
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63 }
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64 }
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65 return get("", true);
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66 }
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68 // invoke when path pool is no longer in use, to ease gc work
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69 public void clear() {
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70 cache.clear();
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71 }
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73 private Path get(String p, boolean create) {
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74 SoftReference<Path> sr = cache.get(p);
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75 Path path = sr == null ? null : sr.get();
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76 if (path == null) {
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77 if (create) {
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78 path = Path.create(p);
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79 cache.put(p, new SoftReference<Path>(path));
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80 } else if (sr != null) {
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81 // cached path no longer used, clear cache entry - do not wait for RefQueue to step in
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82 cache.remove(p);
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83 }
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84 }
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85 return path;
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86 }
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87 }