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comparison src/org/tmatesoft/hg/internal/Pool.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 3dcd3dd90c77
children 12f668401613
comparison
equal deleted inserted replaced
263:31f67be94e71 264:6bb5e7ed051a
16 */ 16 */
17 package org.tmatesoft.hg.internal; 17 package org.tmatesoft.hg.internal;
18 18
19 import java.util.HashMap; 19 import java.util.HashMap;
20 20
21 import org.tmatesoft.hg.util.SparseSet;
22
23 /** 21 /**
24 * Instance pooling. 22 * Instance pooling.
25 * 23 *
26 * @author Artem Tikhomirov 24 * @author Artem Tikhomirov
27 * @author TMate Software Ltd. 25 * @author TMate Software Ltd.
28 */ 26 */
29 public class Pool<T> { 27 public class Pool<T> {
30 private final HashMap<T,T> unify; 28 private final HashMap<T,T> unify;
31 // private final SparseSet<T> unify = new SparseSet<T>();
32 29
33 public Pool() { 30 public Pool() {
34 unify = new HashMap<T, T>(); 31 unify = new HashMap<T, T>();
35 } 32 }
36 33
71 @Override 68 @Override
72 public String toString() { 69 public String toString() {
73 StringBuilder sb = new StringBuilder(); 70 StringBuilder sb = new StringBuilder();
74 sb.append(Pool.class.getSimpleName()); 71 sb.append(Pool.class.getSimpleName());
75 sb.append('<'); 72 sb.append('<');
76 // if (!unify.isEmpty()) { 73 if (!unify.isEmpty()) {
77 // sb.append(unify.keySet().iterator().next().getClass().getName()); 74 sb.append(unify.keySet().iterator().next().getClass().getName());
78 // } 75 }
79 sb.append('>'); 76 sb.append('>');
80 sb.append(':'); 77 sb.append(':');
81 sb.append(unify.size()); 78 sb.append(unify.size());
82 return sb.toString(); 79 return sb.toString();
83 } 80 }