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


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.reflect.Method JavaDoc;
35 import java.util.logging.Level JavaDoc;
36 import java.util.logging.Logger JavaDoc;
37
38 /**
39  * Waits for the start and stop events.
40  */
41 public class StartListener implements EnvironmentListener {
42   private static final L10N L = new L10N(StartListener.class);
43   private static final Logger JavaDoc log = Log.open(StartListener.class);
44
45   private Object JavaDoc _resource;
46
47   /**
48    * Creates the new start listener.
49    *
50    * @param resource the resource which needs start/stop
51    */
52   public StartListener(Object JavaDoc resource)
53   {
54     _resource = resource;
55   }
56
57   /**
58    * Handles the case where a class loader is activated.
59    */
60   public void environmentStart(EnvironmentClassLoader loader)
61   {
62     Method JavaDoc start = getStartMethod(_resource.getClass());
63
64     if (start == null)
65       return;
66     
67     try {
68       start.invoke(_resource);
69     } catch (Throwable JavaDoc e) {
70       log.log(Level.WARNING, e.toString(), e);
71     }
72   }
73   
74   /**
75    * Handles the case where a class loader is dropped.
76    */
77   public void environmentStop(EnvironmentClassLoader loader)
78   {
79     Method JavaDoc stop = getStopMethod(_resource.getClass());
80
81     if (stop == null)
82       return;
83     
84     try {
85       stop.invoke(_resource);
86     } catch (Throwable JavaDoc e) {
87       log.log(Level.WARNING, e.toString(), e);
88     }
89   }
90
91   public static Method JavaDoc getStartMethod(Class JavaDoc cl)
92   {
93     try {
94       return cl.getMethod("start", new Class JavaDoc[0]);
95     } catch (Throwable JavaDoc e) {
96     }
97
98     return null;
99   }
100
101   public static Method JavaDoc getStopMethod(Class JavaDoc cl)
102   {
103     try {
104       return cl.getMethod("stop", new Class JavaDoc[0]);
105     } catch (Throwable JavaDoc e) {
106     }
107
108     return null;
109   }
110 }
111
112
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