CacheManagerFactory


1   package org.apache.slide.util;
2   
3   import java.net.URL  ;
4   
5   import net.sf.ehcache.CacheException;
6   import net.sf.ehcache.CacheManager;
7   
8   /**
9    * A factory for obtaining ehcache CacheManagers. This simplifies the process
10   * of obtaining a CacheManager.
11   *
12   */
13  public class CacheManagerFactory {
14      
15      private static CacheManager defaultCacheManager;
16      private static HashMap cacheManagers = new HashMap();
17  
18      private CacheManagerFactory() {}
19      
20      /**
21       * Retrieves the default CacheManager using the default configuration file.
22       * 
23       * @return the default CacheManager.
24       * @throws CacheException
25       */
26      public static CacheManager getDefaultCacheManager() throws CacheException {
27          if ( defaultCacheManager == null ) {
28              defaultCacheManager = CacheManager.create();
29          }
30          return defaultCacheManager;
31      }
32      
33      /**
34       * Creates a CacheManager using the configuration file at configFilePath, then adds
35       * the CacheManager to an internal Map. Subsequent requests for a CacheManager with
36       * the same configFilePath returns the CacheManager from the Map.
37       * 
38       * @param configFilePath path to the configuration file to use.
39       * @return a CacheManager
40       * @throws CacheException
41       */
42      public static CacheManager getCacheManager( String   configFilePath ) throws CacheException {
43          CacheManager cm = (CacheManager)cacheManagers.get( configFilePath );
44          if ( cm == null ) {
45              cm = CacheManager.create( configFilePath );
46          }
47          return cm;
48      }
49      
50      /**
51       * Creates a CacheManager using the configuration file at configFileURL, then adds
52       * the CacheManager to an internal Map. Subsequent requests for a CacheManager with
53       * the same configFileURL returns the CacheManager from the Map.
54       * 
55       * @param configFileURL URL to the configuration file to use.
56       * @return a CacheManager
57       * @throws CacheException
58       */
59      public static CacheManager getCacheManager( URL   configFileURL ) throws CacheException {
60          CacheManager cm = (CacheManager)cacheManagers.get( configFileURL );
61          if ( cm == null ) {
62              cm = CacheManager.create( configFileURL );
63          }
64          return cm;
65      }
66  
67  }
68
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