ExpiringLRUCacheFactoryImpl


1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    *  contributor license agreements.  The ASF licenses this file to You
4    * under the Apache License, Version 2.0 (the "License"); you may not
5    * use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    *     http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.  For additional information regarding
15   * copyright in this work, please see the NOTICE file in the top level
16   * directory of this distribution.
17   */
18  
19  package org.apache.roller.util.cache;
20  
21  import java.util.Map  ;
22  import org.apache.commons.logging.Log;
23  import org.apache.commons.logging.LogFactory;
24  
25  
26  /**
27   * Roller Expiring LRU cache factory.
28   */
29  public class ExpiringLRUCacheFactoryImpl implements CacheFactory {
30      
31      private static Log log = LogFactory.getLog(ExpiringLRUCacheFactoryImpl.class);
32      
33      
34      // protected so only the CacheManager can instantiate us
35      protected ExpiringLRUCacheFactoryImpl() {}
36      
37      
38      /**
39       * Construct a new instance of a Roller Expiring LRUCache.
40       */
41      public Cache constructCache(Map   properties) {
42          
43          int size = 100;
44          long timeout = 15 * 60;
45          String   id = "unknown";
46          
47          try {
48              size = Integer.parseInt((String  ) properties.get("size"));
49          } catch(Exception   e) {
50              // ignored
51          }
52          
53          try {
54              timeout = Long.parseLong((String  ) properties.get("timeout"));
55          } catch(Exception   e) {
56              // ignored
57          }
58          
59          String   cacheId = (String  ) properties.get("id");
60          if(cacheId != null) {
61              id = cacheId;
62          }
63          
64          Cache cache = new ExpiringLRUCacheImpl(id, size, timeout);
65          
66          log.debug("new cache constructed. size="+size+", timeout="+timeout);
67          
68          return cache;
69      }
70      
71  }
72
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