Mercurial > hg > blitz_stable

annotate src/com/go/trove/util/Cache.java @ 27:511648fa4d64 Version 2.1

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Version to 2.1
author Dan Creswell <dan.creswell@gmail.com>
date Mon, 04 Jan 2010 13:00:40 +0000
parents 3dc0c5604566
children
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1 /* ====================================================================
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2 * Trove - Copyright (c) 1997-2000 Walt Disney Internet Group
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3 * ====================================================================
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4 * The Tea Software License, Version 1.1
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5 *
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6 * Copyright (c) 2000 Walt Disney Internet Group. All rights reserved.
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7 *
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8 * Redistribution and use in source and binary forms, with or without
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9 * modification, are permitted provided that the following conditions
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10 * are met:
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11 *
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12 * 1. Redistributions of source code must retain the above copyright
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13 * notice, this list of conditions and the following disclaimer.
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14 *
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15 * 2. Redistributions in binary form must reproduce the above copyright
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16 * notice, this list of conditions and the following disclaimer in
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17 * the documentation and/or other materials provided with the
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18 * distribution.
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19 *
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20 * 3. The end-user documentation included with the redistribution,
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21 * if any, must include the following acknowledgment:
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22 * "This product includes software developed by the
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23 * Walt Disney Internet Group (http://opensource.go.com/)."
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24 * Alternately, this acknowledgment may appear in the software itself,
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25 * if and wherever such third-party acknowledgments normally appear.
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26 *
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27 * 4. The names "Tea", "TeaServlet", "Kettle", "Trove" and "BeanDoc" must
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28 * not be used to endorse or promote products derived from this
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29 * software without prior written permission. For written
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30 * permission, please contact opensource@dig.com.
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31 *
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32 * 5. Products derived from this software may not be called "Tea",
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33 * "TeaServlet", "Kettle" or "Trove", nor may "Tea", "TeaServlet",
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34 * "Kettle", "Trove" or "BeanDoc" appear in their name, without prior
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35 * written permission of the Walt Disney Internet Group.
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36 *
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37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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40 * DISCLAIMED. IN NO EVENT SHALL THE WALT DISNEY INTERNET GROUP OR ITS
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41 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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42 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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43 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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44 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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45 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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46 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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47 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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48 * ====================================================================
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49 *
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50 * For more information about Tea, please see http://opensource.go.com/.
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51 */
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52
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53 package com.go.trove.util;
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54
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55 import java.util.*;
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56
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57 /******************************************************************************
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58 * Cache is a SoftHashMap that is guaranteed to have the most recently used
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59 * entries available. Calling "get" or "put" updates the internal MRU list,
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60 * but calling "containsKey" or "containsValue" will not.
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61 * <p>
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62 * Like its base class, Cache is not thread-safe and must be wrapped with
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63 * Collections.synchronizedMap to be made thread-safe.
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64 *
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65 * @author Brian S O'Neill
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66 * @version
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67 * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 01/05/30 <!-- $-->
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68 */
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69 public class Cache extends SoftHashMap {
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70 private final int mMaxRecent;
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71 // Contains hard references to entries.
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72 private final UsageMap mUsageMap;
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73
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74 /**
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75 * Construct a Cache with an amount of recently used entries that are
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76 * guaranteed to always be in the Cache.
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77 *
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78 * @param maxRecent maximum amount of recently used entries guaranteed to
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79 * be in the Cache.
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80 * @throws IllegalArgumentException if maxRecent is less than or equal to
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81 * zero.
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82 */
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83 public Cache(int maxRecent) {
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84 if (maxRecent <= 0) {
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85 throw new IllegalArgumentException
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86 ("Max recent must be greater than zero: " + maxRecent);
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87 }
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88 mMaxRecent = maxRecent;
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89 mUsageMap = new UsageMap();
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90 }
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91
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92 /**
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93 * Piggyback this Cache onto another one in order for the map of recently
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94 * used entries to be shared. If this Cache is more active than the one
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95 * it attaches to, then more of its most recently used entries will be
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96 * guaranteed to be in the Cache, possibly bumping out entries from the
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97 * other Cache.
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98 */
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99 public Cache(Cache cache) {
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100 mMaxRecent = cache.mMaxRecent;
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101 mUsageMap = cache.mUsageMap;
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102 }
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103
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104 public Object get(Object key) {
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105 Object value = super.get(key);
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106 if (value != null || super.containsKey(key)) {
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107 adjustMRU(key, value);
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108 }
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109 return value;
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110 }
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111
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112 public Object put(Object key, Object value) {
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113 if (value == null) {
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114 value = new Null();
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115 }
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116 adjustMRU(key, value);
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117 return super.put(key, value);
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118 }
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119
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120 public Object remove(Object key) {
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121 synchronized (mUsageMap) {
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122 mUsageMap.remove(key);
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123 }
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124 return super.remove(key);
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125 }
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126
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127 public void clear() {
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128 super.clear();
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129 synchronized (mUsageMap) {
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130 mUsageMap.clear();
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131 }
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132 }
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133
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134 private void adjustMRU(Object key, Object value) {
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135 synchronized (mUsageMap) {
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136 Object existing = mUsageMap.get(key);
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137
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138 if (existing != null) {
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139 if (value == null && existing instanceof Null) {
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140 value = existing;
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141 }
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142 }
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143 else {
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144 if (!mUsageMap.containsKey(key)) {
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145 // A new entry will be put into the UsageMap, so remove
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146 // least recently used if MRU is too big.
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147 while (mUsageMap.size() >= mMaxRecent) {
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148 mUsageMap.remove(mUsageMap.lastKey());
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149 }
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150 }
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151 }
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152
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153 mUsageMap.put(key, value);
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154 }
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155 }
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156 }