NodeCache


1   /*
2   
3   This software is OSI Certified Open Source Software.
4   OSI Certified is a certification mark of the Open Source Initiative.
5   
6   The license (Mozilla version 1.0) can be read at the MMBase site.
7   See http://www.MMBase.org/license
8   
9   */
10  package org.mmbase.cache;
11  import org.mmbase.core.event.*;
12  import org.mmbase.module.core.*;
13  
14  /**
15   * A cache for MMObjectNodes. 
16   *
17   * @author  Michiel Meeuwissen
18   * @version $Id: NodeCache.java,v 1.6 2006/06/23 17:01:00 michiel Exp $
19   */
20  public class NodeCache extends Cache implements NodeEventListener { 
21      private static final int CACHE_SIZE = 4 * 1024;
22  
23      private static NodeCache cache;
24  
25      public static NodeCache getCache() {
26          return cache;
27      }
28  
29      static {
30          cache = new NodeCache();
31          cache.putCache();
32      }
33  
34      public String   getName() {
35          return "Nodes";
36      }
37      public String   getDescription() {
38          return "Node number -> MMObjectNodes";
39      }
40  
41      /**
42       * Creates the MMBase ObjectNodes Cache.
43       */
44      private NodeCache() {
45          super(CACHE_SIZE);
46          // node cache is registered as a Listener in MMBase.java.
47      }
48  
49  
50      public Object   remove(Object   key) {
51          RelatedNodesCache.getCache().removeNode((Integer  ) key);
52          return super.remove(key);
53      }
54  
55  
56      public void notify(NodeEvent event) {
57          int type = event.getType();
58          if(type == Event.TYPE_DELETE || ((! event.isLocal()) && type == Event.TYPE_CHANGE)) {
59              Integer   changedNodeNumber = new Integer  (event.getNodeNumber());
60              remove(changedNodeNumber);
61          }
62      }
63  }
64
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