01: /*
02: * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
03: *
04: * This file is part of Resin(R) Open Source
05: *
06: * Each copy or derived work must preserve the copyright notice and this
07: * notice unmodified.
08: *
09: * 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;
35: import java.util.logging.Logger;
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 log = Log.open(CloseListener.class);
43:
44: private WeakReference<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: _listenerRef = new WeakReference<ClassLoaderListener>(listener);
53: }
54:
55: /**
56: * Handles the case where a class loader is activated.
57: */
58: public void classLoaderInit(DynamicClassLoader loader) {
59: ClassLoaderListener listener = _listenerRef.get();
60:
61: if (listener != null)
62: listener.classLoaderInit(loader);
63: }
64:
65: /**
66: * Handles the case where a class loader is dropped.
67: */
68: public void classLoaderDestroy(DynamicClassLoader loader) {
69: ClassLoaderListener listener = _listenerRef.get();
70:
71: if (listener != null)
72: listener.classLoaderDestroy(loader);
73: }
74: }
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