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Java > Open Source Codes > com > caucho > loader > WeakLoaderListener


1 /*
2  * Copyright (c) 1998-2006 Caucho Technology -- all rights reserved
3  *
4  * This file is part of Resin(R) Open Source
5  *
6  * Each copy or derived work must preserve the copyright notice and this
7  * notice unmodified.
8  *
9  * Resin Open Source is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * Resin Open Source is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
17  * of NON-INFRINGEMENT. See the GNU General Public License for more
18  * details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with Resin Open Source; if not, write to the
22  * Free SoftwareFoundation, Inc.
23  * 59 Temple Place, Suite 330
24  * Boston, MA 02111-1307 USA
25  *
26  * @author Scott Ferguson
27  */
28
29 package com.caucho.loader;
30
31 import com.caucho.log.Log;
32 import com.caucho.util.L10N;
33
34 import java.lang.ref.WeakReference JavaDoc;
35 import java.util.logging.Logger JavaDoc;
36
37 /**
38  * Waits for the close event and calls a destroy() method.
39  */
40 public class WeakLoaderListener implements ClassLoaderListener {
41   private static final L10N L = new L10N(CloseListener.class);
42   private static final Logger JavaDoc log = Log.open(CloseListener.class);
43
44   private WeakReference JavaDoc<ClassLoaderListener> _listenerRef;
45
46   /**
47    * Creates the new close listener.
48    *
49    * @param resource the resource which needs closing
50    */
51   public WeakLoaderListener(ClassLoaderListener listener)
52   {
53     _listenerRef = new WeakReference JavaDoc<ClassLoaderListener>(listener);
54   }
55
56   /**
57    * Handles the case where a class loader is activated.
58    */
59   public void classLoaderInit(DynamicClassLoader loader)
60   {
61     ClassLoaderListener listener = _listenerRef.get();
62     
63     if (listener != null)
64       listener.classLoaderInit(loader);
65   }
66   
67   /**
68    * Handles the case where a class loader is dropped.
69    */
70   public void classLoaderDestroy(DynamicClassLoader loader)
71   {
72     ClassLoaderListener listener = _listenerRef.get();
73     
74     if (listener != null)
75       listener.classLoaderDestroy(loader);
76   }
77 }
78
79
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