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org.apache.jcs.auxiliary.disk.block.BlockDiskCacheManager |
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1 | package org.apache.jcs.auxiliary.disk.block; |
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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 BlockDiskCaches. 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 BlockDiskCacheManager |
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36 | implements AuxiliaryCacheManager |
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37 | { |
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38 | /** Don't change */ |
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39 | private static final long serialVersionUID = -4153287154512274626L; |
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40 | ||
41 | /** The logger */ |
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42 | 32 | private final static Log log = LogFactory.getLog( BlockDiskCacheManager.class ); |
43 | ||
44 | /** ? */ |
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45 | private static int clients; |
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46 | ||
47 | /** The singleton instance */ |
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48 | private static BlockDiskCacheManager instance; |
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49 | ||
50 | /** block disks for a region. */ |
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51 | 16 | private Hashtable caches = new Hashtable(); |
52 | ||
53 | /** Attributes. */ |
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54 | private BlockDiskCacheAttributes defaultCacheAttributes; |
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55 | ||
56 | /** |
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57 | * Constructor for the BlockDiskCacheManager object |
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58 | * <p> |
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59 | * @param defaultCacheAttributes |
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60 | * Default attributes for caches managed by the instance. |
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61 | */ |
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62 | private BlockDiskCacheManager( BlockDiskCacheAttributes defaultCacheAttributes ) |
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63 | 16 | { |
64 | 16 | this.defaultCacheAttributes = defaultCacheAttributes; |
65 | 16 | } |
66 | ||
67 | /** |
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68 | * Gets the singleton instance of the manager |
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69 | * <p> |
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70 | * @param defaultCacheAttributes |
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71 | * If the instance has not yet been created, it will be |
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72 | * initialized with this set of default attributes. |
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73 | * @return The instance value |
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74 | */ |
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75 | public static BlockDiskCacheManager getInstance( BlockDiskCacheAttributes defaultCacheAttributes ) |
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76 | { |
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77 | 96 | synchronized ( BlockDiskCacheManager.class ) |
78 | { |
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79 | 96 | if ( instance == null ) |
80 | { |
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81 | 16 | instance = new BlockDiskCacheManager( defaultCacheAttributes ); |
82 | } |
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83 | 96 | } |
84 | ||
85 | 96 | clients++; |
86 | ||
87 | 96 | return instance; |
88 | } |
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89 | ||
90 | /** |
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91 | * Gets an BlockDiskCache for the supplied name using the default |
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92 | * attributes. |
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93 | * <p> |
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94 | * @param cacheName |
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95 | * Name that will be used when creating attributes. |
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96 | * @return A cache. |
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97 | */ |
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98 | public AuxiliaryCache getCache( String cacheName ) |
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99 | { |
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100 | 0 | BlockDiskCacheAttributes cacheAttributes = (BlockDiskCacheAttributes) defaultCacheAttributes.copy(); |
101 | ||
102 | 0 | cacheAttributes.setCacheName( cacheName ); |
103 | ||
104 | 0 | return getCache( cacheAttributes ); |
105 | } |
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106 | ||
107 | /** |
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108 | * Get an BlockDiskCache for the supplied attributes. Will provide an |
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109 | * existing cache for the name attribute if one has been created, or will |
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110 | * create a new cache. |
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111 | * <p> |
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112 | * @param cacheAttributes |
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113 | * Attributes the cache should have. |
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114 | * @return A cache, either from the existing set or newly created. |
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115 | */ |
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116 | public AuxiliaryCache getCache( BlockDiskCacheAttributes cacheAttributes ) |
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117 | { |
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118 | 96 | AuxiliaryCache cache = null; |
119 | ||
120 | 96 | String cacheName = cacheAttributes.getCacheName(); |
121 | ||
122 | 96 | log.debug( "Getting cache named: " + cacheName ); |
123 | ||
124 | 96 | synchronized ( caches ) |
125 | { |
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126 | // Try to load the cache from the set that have already been |
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127 | // created. This only looks at the name attribute. |
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128 | ||
129 | 96 | cache = (AuxiliaryCache) caches.get( cacheName ); |
130 | ||
131 | // If it was not found, create a new one using the supplied |
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132 | // attributes |
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133 | ||
134 | 96 | if ( cache == null ) |
135 | { |
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136 | 96 | cache = new BlockDiskCache( cacheAttributes ); |
137 | ||
138 | 96 | caches.put( cacheName, cache ); |
139 | } |
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140 | 96 | } |
141 | ||
142 | 96 | return cache; |
143 | } |
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144 | ||
145 | /** |
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146 | * Disposes the cache with the given name, if found in the set of managed |
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147 | * caches. |
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148 | * <p> |
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149 | * @param cacheName |
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150 | * Name of cache to dispose. |
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151 | */ |
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152 | public void freeCache( String cacheName ) |
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153 | { |
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154 | 0 | ICache cache = (ICache) caches.get( cacheName ); |
155 | ||
156 | 0 | if ( cache != null ) |
157 | { |
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158 | try |
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159 | { |
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160 | 0 | cache.dispose(); |
161 | } |
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162 | 0 | catch ( Exception e ) |
163 | { |
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164 | 0 | log.error( "Failure disposing cache: " + cacheName, e ); |
165 | 0 | } |
166 | } |
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167 | 0 | } |
168 | ||
169 | /** |
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170 | * Gets the cacheType attribute of the DiskCacheManager object |
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171 | * <p> |
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172 | * @return The cacheType value |
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173 | */ |
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174 | public int getCacheType() |
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175 | { |
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176 | 0 | return DISK_CACHE; |
177 | } |
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178 | ||
179 | /** |
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180 | * Releases the cache manager instance. When all clients have released the |
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181 | * cache manager, all contained caches will be disposed. |
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182 | */ |
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183 | public void release() |
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184 | { |
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185 | 0 | clients--; |
186 | ||
187 | 0 | if ( --clients != 0 ) |
188 | { |
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189 | 0 | return; |
190 | } |
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191 | ||
192 | 0 | synchronized ( caches ) |
193 | { |
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194 | 0 | Enumeration allCaches = caches.elements(); |
195 | ||
196 | 0 | while ( allCaches.hasMoreElements() ) |
197 | { |
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198 | 0 | ICache cache = (ICache) allCaches.nextElement(); |
199 | ||
200 | 0 | if ( cache != null ) |
201 | { |
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202 | try |
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203 | { |
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204 | 0 | cache.dispose(); |
205 | } |
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206 | 0 | catch ( Exception e ) |
207 | { |
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208 | 0 | log.error( "Failure disposing cache: " + cache.getCacheName(), e ); |
209 | 0 | } |
210 | } |
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211 | 0 | } |
212 | 0 | } |
213 | 0 | } |
214 | } |
This report is generated by jcoverage, Maven and Maven JCoverage Plugin. |