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Java > Open Source Codes > com > sun > enterprise > admin > monitor > registry > spi > reconfig > WebContainerChangeHandler


1 /*
2  * The contents of this file are subject to the terms
3  * of the Common Development and Distribution License
4  * (the License). You may not use this file except in
5  * compliance with the License.
6  *
7  * You can obtain a copy of the license at
8  * https://glassfish.dev.java.net/public/CDDLv1.0.html or
9  * glassfish/bootstrap/legal/CDDLv1.0.txt.
10  * See the License for the specific language governing
11  * permissions and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL
14  * Header Notice in each file and include the License file
15  * at glassfish/bootstrap/legal/CDDLv1.0.txt.
16  * If applicable, add the following below the CDDL Header,
17  * with the fields enclosed by brackets [] replaced by
18  * you own identifying information:
19  * "Portions Copyrighted [year] [name of copyright owner]"
20  *
21  * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
22  */
23
24 /* WebContainerChangeHandler.java
25  * $Id: WebContainerChangeHandler.java,v 1.3 2005/12/25 03:43:42 tcfujii Exp $
26  * $Revision: 1.3 $
27  * $Date: 2005/12/25 03:43:42 $
28  * Indentation Information:
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34  * 1. Tools->Options->Editor Settings->Java Editor->Tab Size = 4
35  * 2. Tools->Options->Indentation Engines->Java Indentation Engine->Expand Tabs to Spaces = False.
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37  */
38
39 package com.sun.enterprise.admin.monitor.registry.spi.reconfig;
40
41 import java.util.Iterator JavaDoc;
42 import java.util.Map JavaDoc;
43 import java.util.logging.Logger JavaDoc;
44 import com.sun.enterprise.admin.monitor.registry.MonitoringLevel;
45 import com.sun.enterprise.admin.monitor.registry.MonitoredObjectType;
46 import com.sun.enterprise.admin.monitor.registry.StatsHolder;
47 import com.sun.enterprise.admin.monitor.registry.MonitoringLevelListener;
48
49 import com.sun.enterprise.admin.monitor.registry.spi.ValueListMap;
50 import com.sun.enterprise.admin.monitor.registry.spi.MonitoringRegistrationHelper;
51 import com.sun.enterprise.admin.common.constant.AdminConstants;
52
53 /**
54  * Provides for dynamic reconfiguration of web container and related components like
55  * servlets and web-module. This class decides the actions to take when there are
56  * changes to the monitoring level through administrative interfaces.
57  * @author <a HREF="mailto:Kedar.Mhaswade@sun.com">Kedar Mhaswade</a>
58  * @since S1AS8.0
59  * @version $Revision: 1.3 $
60  */
61 class WebContainerChangeHandler implements ChangeHandler {
62     
63     private final ChangeHandler successor;
64     private MonitoringRegistrationHelper registryImpl;
65     private final ValueListMap listeners;
66     
67     private static final Logger JavaDoc logger = Logger.getLogger(AdminConstants.kLoggerName);
68     
69     WebContainerChangeHandler(ChangeHandler successor, ValueListMap listeners) {
70         this.successor = successor;
71         this.listeners = listeners;
72     }
73     
74     public void handleChange(MonitoredObjectType t, MonitoringLevel from, MonitoringLevel to) {
75         if (isWebContainerType(t)) {
76             handleChange(from, to, t);
77         }
78         else {
79             successor.handleChange(t, from, to);
80         }
81     }
82     
83     private boolean isWebContainerType(MonitoredObjectType t) {
84         return ( t == MonitoredObjectType.SERVLET ||
85                  t == MonitoredObjectType.WEBMODULE);
86     }
87     
88     private void handleChange(MonitoringLevel from, MonitoringLevel to,
89                                   MonitoredObjectType t) {
90         if (off2Low(from, to) || off2High(from, to)) {
91             notifyListeners(from, to, t);
92             registerMBeans();
93         }
94         if (low2Off(from, to) || high2Off(from, to)) {
95             unregisterMBeans();
96             notifyListeners(from, to, t);
97         }
98         if (low2High(from, to) || high2Low(from, to)) {
99             //currently do nothing.
100 }
101     }
102     
103     private void notifyListeners(MonitoringLevel from, MonitoringLevel to, MonitoredObjectType t) {
104         logger.finer("DynamicReconfigurator: Notifying the listeners for web container --- from = " + from.toString() + " to = " + to.toString());
105         final Map JavaDoc l = (Map JavaDoc)listeners.get(t); // map of listeners;
106 if (l == null)
107             return; //do nothing
108 final Iterator JavaDoc it = l.keySet().iterator();
109         while (it.hasNext()) {
110             final MonitoringLevelListener ml = (MonitoringLevelListener)it.next();
111             ml.changeLevel(from, to, t);
112         }
113     }
114     
115     private void registerMBeans() {
116         final MonitoringRegistrationHelper registryImpl =
117             (MonitoringRegistrationHelper) MonitoringRegistrationHelper.getInstance();
118         //note that the above refers to the actual implementation rather than interface.
119
120         //registers MBeans pertaining to web-container, servlets
121 final Iterator JavaDoc iter = registryImpl.getWebContainerNodes().iterator();
122         while (iter.hasNext()) {
123             final StatsHolder c = (StatsHolder) iter.next();
124             c.registerMBean();
125             logger.finer("DynamicReconfigurator: Now Registering MBean for --- " + c.getName());
126         }
127     }
128     
129     private void unregisterMBeans() {
130         final MonitoringRegistrationHelper registryImpl =
131             (MonitoringRegistrationHelper) MonitoringRegistrationHelper.getInstance();
132         //note that the above refers to the actual implementation rather than interface.
133
134         final Iterator JavaDoc iter = registryImpl.getWebContainerNodes().iterator();
135         while (iter.hasNext()) {
136             final StatsHolder c = (StatsHolder) iter.next();
137             c.unregisterMBean();
138             logger.finer("DynamicReconfigurator: Now UnRegistering MBean for --- " + c.getName());
139         }
140     }
141
142     private boolean off2Low(MonitoringLevel from, MonitoringLevel to) {
143         return ( from == MonitoringLevel.OFF && to == MonitoringLevel.LOW );
144     }
145     private boolean off2High(MonitoringLevel from, MonitoringLevel to) {
146         return ( from == MonitoringLevel.OFF && to == MonitoringLevel.HIGH );
147     }
148     private boolean low2Off(MonitoringLevel from, MonitoringLevel to) {
149         return ( from == MonitoringLevel.LOW && to == MonitoringLevel.OFF);
150     }
151     private boolean high2Off(MonitoringLevel from, MonitoringLevel to) {
152         return ( from == MonitoringLevel.HIGH && to == MonitoringLevel.OFF );
153     }
154     private boolean low2High(MonitoringLevel from, MonitoringLevel to) {
155         return ( from == MonitoringLevel.LOW && to == MonitoringLevel.HIGH);
156     }
157     private boolean high2Low(MonitoringLevel from, MonitoringLevel to) {
158         return ( from == MonitoringLevel.HIGH && to == MonitoringLevel.LOW );
159     }
160 }
161
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