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1   package org.apache.jcs.auxiliary.disk.jdbc;
2   
3   /*
4    * Licensed to the Apache Software Foundation (ASF) under one
5    * or more contributor license agreements.  See the NOTICE file
6    * distributed with this work for additional information
7    * regarding copyright ownership.  The ASF licenses this file
8    * to you under the Apache License, Version 2.0 (the
9    * "License"); you may not use this file except in compliance
10   * with the License.  You may obtain a copy of the License at
11   *
12   *   http://www.apache.org/licenses/LICENSE-2.0
13   *
14   * Unless required by applicable law or agreed to in writing,
15   * software distributed under the License is distributed on an
16   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17   * KIND, either express or implied.  See the License for the
18   * specific language governing permissions and limitations
19   * under the License.
20   */
21  
22  import org.apache.commons.logging.Log;
23  import org.apache.commons.logging.LogFactory;
24  import org.apache.jcs.auxiliary.AuxiliaryCache;
25  
26  /***
27   * This manages instances of the jdbc disk cache. It maintains one for each
28   * region. One for all regions would work, but this gives us more detailed stats
29   * by region.
30   */
31  public class JDBCDiskCacheManager
32      extends JDBCDiskCacheManagerAbstractTemplate
33  {
34      private static final long serialVersionUID = -8258856770927857896L;
35  
36      private static final Log log = LogFactory.getLog( JDBCDiskCacheManager.class );
37  
38      private static JDBCDiskCacheManager instance;
39  
40      private JDBCDiskCacheAttributes defaultJDBCDiskCacheAttributes;
41  
42      /***
43       * Constructor for the HSQLCacheManager object
44       * <p>
45       * @param cattr
46       */
47      private JDBCDiskCacheManager( JDBCDiskCacheAttributes cattr )
48      {
49          if ( log.isInfoEnabled() )
50          {
51              log.info( "Creating JDBCDiskCacheManager with " + cattr );
52          }
53          defaultJDBCDiskCacheAttributes = cattr;
54      }
55  
56      /***
57       * Gets the defaultCattr attribute of the HSQLCacheManager object
58       * <p>
59       * @return The defaultCattr value
60       */
61      public JDBCDiskCacheAttributes getDefaultJDBCDiskCacheAttributes()
62      {
63          return defaultJDBCDiskCacheAttributes;
64      }
65  
66      /***
67       * Gets the instance attribute of the HSQLCacheManager class
68       * <p>
69       * @param cattr
70       * @return The instance value
71       */
72      public static JDBCDiskCacheManager getInstance( JDBCDiskCacheAttributes cattr )
73      {
74          synchronized ( JDBCDiskCacheManager.class )
75          {
76              if ( instance == null )
77              {
78                  instance = new JDBCDiskCacheManager( cattr );
79              }
80          }
81          clients++;
82          return instance;
83      }
84  
85      /***
86       * Gets the cache attribute of the HSQLCacheManager object
87       * <p>
88       * @param cacheName
89       * @return The cache value
90       */
91      public AuxiliaryCache getCache( String cacheName )
92      {
93          JDBCDiskCacheAttributes cattr = (JDBCDiskCacheAttributes) defaultJDBCDiskCacheAttributes.copy();
94          cattr.setCacheName( cacheName );
95          return getCache( cattr );
96      }
97  
98      /***
99       * Creates a JDBCDiskCache using the supplied attributes.
100      * <p>
101      * @param cattr
102      * @return
103      */
104     protected AuxiliaryCache createJDBCDiskCache( JDBCDiskCacheAttributes cattr, TableState tableState )
105     {
106         AuxiliaryCache raf;
107         raf = new JDBCDiskCache( cattr, tableState );
108         return raf;
109     }
110 }