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org.apache.jcs.auxiliary.disk.indexed.IndexedDiskCacheManager |
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1 | package org.apache.jcs.auxiliary.disk.indexed; |
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2 | ||
3 | /* |
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4 | * Licensed to the Apache Software Foundation (ASF) under one |
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5 | * or more contributor license agreements. See the NOTICE file |
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6 | * distributed with this work for additional information |
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7 | * regarding copyright ownership. The ASF licenses this file |
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8 | * to you under the Apache License, Version 2.0 (the |
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9 | * "License"); you may not use this file except in compliance |
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10 | * with the License. You may obtain a copy of the License at |
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11 | * |
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12 | * http://www.apache.org/licenses/LICENSE-2.0 |
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13 | * |
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14 | * Unless required by applicable law or agreed to in writing, |
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15 | * software distributed under the License is distributed on an |
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16 | * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
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17 | * KIND, either express or implied. See the License for the |
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18 | * specific language governing permissions and limitations |
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19 | * under the License. |
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20 | */ |
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21 | ||
22 | import java.util.Enumeration; |
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23 | import java.util.Hashtable; |
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24 | ||
25 | import org.apache.commons.logging.Log; |
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26 | import org.apache.commons.logging.LogFactory; |
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27 | import org.apache.jcs.auxiliary.AuxiliaryCache; |
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28 | import org.apache.jcs.auxiliary.AuxiliaryCacheManager; |
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29 | import org.apache.jcs.engine.behavior.ICache; |
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30 | ||
31 | /** |
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32 | * Cache manager for IndexedDiskCaches. This manages the instances of the disk |
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33 | * cache. |
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34 | */ |
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35 | public class IndexedDiskCacheManager |
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36 | implements AuxiliaryCacheManager |
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37 | { |
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38 | private static final long serialVersionUID = -4153287154512274626L; |
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39 | ||
40 | 116 | private final static Log log = LogFactory.getLog( IndexedDiskCacheManager.class ); |
41 | ||
42 | private static int clients; |
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43 | ||
44 | private static IndexedDiskCacheManager instance; |
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45 | ||
46 | 58 | private Hashtable caches = new Hashtable(); |
47 | ||
48 | private IndexedDiskCacheAttributes defaultCacheAttributes; |
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49 | ||
50 | /** |
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51 | * Constructor for the IndexedDiskCacheManager object |
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52 | * <p> |
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53 | * @param defaultCacheAttributes |
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54 | * Default attributes for caches managed by the instance. |
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55 | */ |
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56 | private IndexedDiskCacheManager( IndexedDiskCacheAttributes defaultCacheAttributes ) |
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57 | 58 | { |
58 | 58 | this.defaultCacheAttributes = defaultCacheAttributes; |
59 | 58 | } |
60 | ||
61 | /** |
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62 | * Gets the singleton instance of the manager |
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63 | * <p> |
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64 | * @param defaultCacheAttributes |
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65 | * If the instance has not yet been created, it will be |
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66 | * initialized with this set of default attributes. |
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67 | * @return The instance value |
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68 | */ |
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69 | public static IndexedDiskCacheManager getInstance( IndexedDiskCacheAttributes defaultCacheAttributes ) |
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70 | { |
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71 | 209 | synchronized ( IndexedDiskCacheManager.class ) |
72 | { |
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73 | 209 | if ( instance == null ) |
74 | { |
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75 | 58 | instance = new IndexedDiskCacheManager( defaultCacheAttributes ); |
76 | } |
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77 | 209 | } |
78 | ||
79 | 209 | clients++; |
80 | ||
81 | 209 | return instance; |
82 | } |
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83 | ||
84 | /** |
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85 | * Gets an IndexedDiskCache for the supplied name using the default |
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86 | * attributes. |
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87 | * <p> |
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88 | * @param cacheName |
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89 | * Name that will be used when creating attributes. |
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90 | * @return A cache. |
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91 | */ |
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92 | public AuxiliaryCache getCache( String cacheName ) |
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93 | { |
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94 | 0 | IndexedDiskCacheAttributes cacheAttributes = (IndexedDiskCacheAttributes) defaultCacheAttributes.copy(); |
95 | ||
96 | 0 | cacheAttributes.setCacheName( cacheName ); |
97 | ||
98 | 0 | return getCache( cacheAttributes ); |
99 | } |
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100 | ||
101 | /** |
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102 | * Get an IndexedDiskCache for the supplied attributes. Will provide an |
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103 | * existing cache for the name attribute if one has been created, or will |
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104 | * create a new cache. |
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105 | * <p> |
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106 | * @param cacheAttributes |
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107 | * Attributes the cache should have. |
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108 | * @return A cache, either from the existing set or newly created. |
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109 | */ |
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110 | public AuxiliaryCache getCache( IndexedDiskCacheAttributes cacheAttributes ) |
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111 | { |
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112 | 209 | AuxiliaryCache cache = null; |
113 | ||
114 | 209 | String cacheName = cacheAttributes.getCacheName(); |
115 | ||
116 | 209 | log.debug( "Getting cache named: " + cacheName ); |
117 | ||
118 | 209 | synchronized ( caches ) |
119 | { |
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120 | // Try to load the cache from the set that have already been |
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121 | // created. This only looks at the name attribute. |
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122 | ||
123 | 209 | cache = (AuxiliaryCache) caches.get( cacheName ); |
124 | ||
125 | // If it was not found, create a new one using the supplied |
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126 | // attributes |
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127 | ||
128 | 209 | if ( cache == null ) |
129 | { |
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130 | 209 | cache = new IndexedDiskCache( cacheAttributes ); |
131 | ||
132 | 209 | caches.put( cacheName, cache ); |
133 | } |
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134 | 209 | } |
135 | ||
136 | 209 | return cache; |
137 | } |
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138 | ||
139 | /** |
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140 | * Disposes the cache with the given name, if found in the set of managed |
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141 | * caches. |
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142 | * <p> |
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143 | * @param cacheName |
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144 | * Name of cache to dispose. |
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145 | */ |
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146 | public void freeCache( String cacheName ) |
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147 | { |
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148 | 0 | ICache cache = (ICache) caches.get( cacheName ); |
149 | ||
150 | 0 | if ( cache != null ) |
151 | { |
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152 | try |
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153 | { |
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154 | 0 | cache.dispose(); |
155 | } |
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156 | 0 | catch ( Exception e ) |
157 | { |
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158 | 0 | log.error( "Failure disposing cache: " + cacheName, e ); |
159 | 0 | } |
160 | } |
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161 | 0 | } |
162 | ||
163 | /** |
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164 | * Gets the cacheType attribute of the DiskCacheManager object |
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165 | * <p> |
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166 | * @return The cacheType value |
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167 | */ |
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168 | public int getCacheType() |
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169 | { |
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170 | 0 | return DISK_CACHE; |
171 | } |
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172 | ||
173 | /** |
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174 | * Releases the cache manager instance. When all clients have released the |
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175 | * cache manager, all contained caches will be disposed. |
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176 | */ |
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177 | public void release() |
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178 | { |
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179 | 0 | clients--; |
180 | ||
181 | 0 | if ( --clients != 0 ) |
182 | { |
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183 | 0 | return; |
184 | } |
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185 | ||
186 | 0 | synchronized ( caches ) |
187 | { |
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188 | 0 | Enumeration allCaches = caches.elements(); |
189 | ||
190 | 0 | while ( allCaches.hasMoreElements() ) |
191 | { |
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192 | 0 | ICache cache = (ICache) allCaches.nextElement(); |
193 | ||
194 | 0 | if ( cache != null ) |
195 | { |
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196 | try |
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197 | { |
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198 | 0 | cache.dispose(); |
199 | } |
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200 | 0 | catch ( Exception e ) |
201 | { |
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202 | 0 | log.error( "Failure disposing cache: " + cache.getCacheName(), e ); |
203 | 0 | } |
204 | } |
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205 | 0 | } |
206 | 0 | } |
207 | 0 | } |
208 | } |
This report is generated by jcoverage, Maven and Maven JCoverage Plugin. |