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annotate src/org/tmatesoft/hg/internal/Pool2.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
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children 85b8efde5586
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264
6bb5e7ed051a Optimize memory usage (reduce number of objects instantiated) when pooling file names and nodeids during manifest parsing
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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
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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 org.tmatesoft.hg.util.SparseSet;
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21 /**
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22 *
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23 * @author Artem Tikhomirov
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24 * @author TMate Software Ltd.
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25 */
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26 public class Pool2<T> {
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27 private final SparseSet<T> unify = new SparseSet<T>();
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29 public Pool2() {
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30 }
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32 public Pool2(int sizeHint) {
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33 }
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35 public T unify(T t) {
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36 T rv = unify.get(t);
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37 if (rv == null) {
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38 // first time we see a new value
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39 unify.put(t);
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40 rv = t;
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41 }
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42 return rv;
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43 }
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45 public boolean contains(T t) {
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46 return unify.get(t) != null;
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47 }
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49 public void record(T t) {
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50 unify.put(t);
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51 }
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53 public void clear() {
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54 unify.clear();
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55 }
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57 public int size() {
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58 return unify.size();
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59 }
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61 public void x() {
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62 unify.dump();
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63 }
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65 @Override
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66 public String toString() {
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67 StringBuilder sb = new StringBuilder();
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68 sb.append(Pool2.class.getSimpleName());
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69 sb.append('@');
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70 sb.append(Integer.toString(System.identityHashCode(this)));
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71 sb.append(' ');
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72 sb.append(unify.toString());
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73 return sb.toString();
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74 }
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75 }