Mercurial > hg > blitz_stable
annotate src/com/go/trove/util/WrappedCache.java @ 35:6f68e94c1fb8 default tip
Add CondensedStats monitoring utility, equivalent to vmstat
author | Dominic Cleal <dominic-cleal@cdo2.com> |
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date | Thu, 05 Aug 2010 11:07:25 +0100 |
parents | 3dc0c5604566 |
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1 /* ==================================================================== |
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2 * Trove - Copyright (c) 1997-2001 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 * A Map that implements a write-through cache to another map. Two maps are |
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59 * supplied: one for caching and one for main storage. WrappedCache is not |
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60 * thread-safe and must be wrapped with Collections.synchronizedMap to be made |
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61 * thread-safe. |
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62 * |
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63 * @author Brian S O'Neill |
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64 * @version |
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65 * <!--$$Revision:--> 2 <!-- $-->, <!--$$JustDate:--> 01/07/31 <!-- $--> |
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66 */ |
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67 public class WrappedCache extends AbstractMap implements Map { |
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68 private final Map mCacheMap; |
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69 private final Map mBackingMap; |
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70 |
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71 /** |
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72 * @param cacheMap the cache map should offer fast access, but it should |
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73 * automatically limit its maximum size |
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74 * @param backingMap the backingMap will be read from only if the requested |
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75 * entry isn't in the cache |
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76 */ |
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77 public WrappedCache(Map cacheMap, Map backingMap) { |
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78 mCacheMap = cacheMap; |
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79 mBackingMap = backingMap; |
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80 } |
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81 |
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82 /** |
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83 * Returns the size of the backing map. |
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84 */ |
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85 public int size() { |
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86 return mBackingMap.size(); |
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87 } |
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88 |
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89 /** |
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90 * Returns the empty status of the backing map. |
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91 */ |
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92 public boolean isEmpty() { |
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93 return mBackingMap.isEmpty(); |
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94 } |
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95 |
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96 /** |
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97 * Returns true if the cache contains the key or else if the backing map |
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98 * contains the key. |
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99 */ |
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100 public boolean containsKey(Object key) { |
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101 return mCacheMap.containsKey(key) || mBackingMap.containsKey(key); |
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102 } |
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103 |
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104 /** |
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105 * Returns true if the cache contains the value or else if the backing map |
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106 * contains the value. |
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107 */ |
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108 public boolean containsValue(Object value) { |
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109 return mCacheMap.containsValue(value) || |
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110 mBackingMap.containsValue(value); |
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111 } |
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112 |
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113 /** |
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114 * Returns the value from the cache, or if not found, the backing map. |
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115 * If the backing map is accessed, the value is saved in the cache for |
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116 * future gets. |
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117 */ |
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118 public Object get(Object key) { |
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119 Object value = mCacheMap.get(key); |
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120 if (value != null || mCacheMap.containsKey(key)) { |
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121 return value; |
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122 } |
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123 value = mBackingMap.get(key); |
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124 if (value != null || mBackingMap.containsKey(key)) { |
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125 mCacheMap.put(key, value); |
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126 } |
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127 return value; |
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128 } |
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129 |
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130 /** |
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131 * Puts the entry into both the cache and backing map. The old value in |
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132 * the backing map is returned. |
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133 */ |
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134 public Object put(Object key, Object value) { |
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135 mCacheMap.put(key, value); |
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136 return mBackingMap.put(key, value); |
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137 } |
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138 |
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139 /** |
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140 * Removes the key from both the cache and backing map. The old value in |
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141 * the backing map is returned. |
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142 */ |
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143 public Object remove(Object key) { |
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144 mCacheMap.remove(key); |
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145 return mBackingMap.remove(key); |
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146 } |
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147 |
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148 /** |
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149 * Clears both the cache and backing map. |
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150 */ |
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151 public void clear() { |
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152 mCacheMap.clear(); |
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153 mBackingMap.clear(); |
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154 } |
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155 |
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156 /** |
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157 * Returns the key set of the backing map. |
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158 */ |
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159 public Set keySet() { |
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160 return mBackingMap.keySet(); |
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161 } |
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162 |
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163 /** |
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164 * Returns the values of the backing map. |
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165 */ |
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166 public Collection values() { |
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167 return mBackingMap.values(); |
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168 } |
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169 |
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170 /** |
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171 * Returns the entry set of the backing map. |
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172 */ |
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173 public Set entrySet() { |
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174 return mBackingMap.entrySet(); |
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175 } |
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176 } |