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.lang.reflect.Method;
36: import java.util.logging.Level;
37: import java.util.logging.Logger;
38:
39: /**
40: * Waits for the stop event and calls a @PreDestroy
41: */
42: public class WeakDestroyListener implements EnvironmentListener {
43: private static final L10N L = new L10N(WeakDestroyListener.class);
44: private static final Logger log = Log
45: .open(WeakDestroyListener.class);
46:
47: private Method _preDestroy;
48: private WeakReference<Object> _objRef;
49:
50: /**
51: * Creates the new stop listener.
52: *
53: * @param resource the resource which needs closing
54: */
55: public WeakDestroyListener(Method preDestroy, Object obj) {
56: _preDestroy = preDestroy;
57:
58: _objRef = new WeakReference<Object>(obj);
59: }
60:
61: /**
62: * Handles the case where a class loader is configured.
63: */
64: public void environmentConfig(EnvironmentClassLoader loader) {
65: }
66:
67: /**
68: * Handles the case where a class loader is activated.
69: */
70: public void environmentStart(EnvironmentClassLoader loader) {
71: }
72:
73: /**
74: * Handles the case where a class loader is dropped.
75: */
76: public void environmentStop(EnvironmentClassLoader loader) {
77: Object obj = _objRef.get();
78: if (obj == null)
79: return;
80:
81: try {
82: _preDestroy.invoke(obj, (Object[]) null);
83: } catch (Throwable e) {
84: log.log(Level.WARNING, e.toString(), e);
85: }
86: }
87: }
|