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


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 /* HttpServiceChangeHandler.java
25  * $Id: HttpServiceChangeHandler.java,v 1.3 2005/12/25 03:43:39 tcfujii Exp $
26  * $Revision: 1.3 $
27  * $Date: 2005/12/25 03:43:39 $
28  * Indentation Information:
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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.MonitoringLevelListener;
46 import com.sun.enterprise.admin.monitor.registry.MonitoredObjectType;
47 import com.sun.enterprise.admin.monitor.registry.StatsHolder;
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 http service and related components like http-listener and virtual server.
55  * 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 HttpServiceChangeHandler implements ChangeHandler {
62     
63     private final ChangeHandler successor;
64     private final ValueListMap listeners;
65     
66     private static final Logger JavaDoc logger = Logger.getLogger(AdminConstants.kLoggerName);
67     HttpServiceChangeHandler(ChangeHandler successor, ValueListMap listeners) {
68         this.successor = successor;
69         this.listeners = listeners;
70     }
71     
72     public void handleChange(MonitoredObjectType t, MonitoringLevel from, MonitoringLevel to) {
73         if (isHttpServiceType(t)) {
74             handleChange(from, to, t);
75         }
76         else {
77             successor.handleChange(t, from, to);
78         }
79     }
80     
81     private boolean isHttpServiceType(MonitoredObjectType t) {
82         return ( t == MonitoredObjectType.HTTP_LISTENER ||
83                  t == MonitoredObjectType.VIRTUAL_SERVER ||
84                  t == MonitoredObjectType.HTTP_SERVICE );
85     }
86     
87     private void handleChange(MonitoringLevel from, MonitoringLevel to, MonitoredObjectType t) {
88         final Map JavaDoc lsnrs = (Map JavaDoc) listeners.get(t);
89         if (off2Low(from, to) || off2High(from, to)) {
90             if(lsnrs != null)
91                 notifyListeners(from, to, t);
92             registerMBeans();
93         }
94         if (low2Off(from, to) || high2Off(from, to)) {
95             if(lsnrs != null)
96                 notifyListeners(from, to, t);
97             else
98                 unregisterMBeans();
99         }
100         if (low2High(from, to) || high2Low(from, to)) {
101             //currently do nothing.
102 }
103     }
104     
105     private void notifyListeners(MonitoringLevel from, MonitoringLevel to, MonitoredObjectType t) {
106         logger.finer("DynamicReconfigurator: Now notifying the listeners for http service --- from = " + from.toString() + " to = " + to.toString());
107         final Map JavaDoc l = (Map JavaDoc)listeners.get(t); // map of listeners;
108 if (l == null)
109             return; //do nothing
110 final Iterator JavaDoc it = l.keySet().iterator();
111         while (it.hasNext()) {
112             final MonitoringLevelListener ml = (MonitoringLevelListener)it.next();
113             ml.changeLevel(from, to, t);
114         }
115     }
116     
117     private void registerMBeans() {
118         final MonitoringRegistrationHelper registryImpl =
119             (MonitoringRegistrationHelper) MonitoringRegistrationHelper.getInstance();
120         //note that the above refers to the actual implementation rather than interface.
121
122         //registers MBeans pertaining to http-listeners
123 final Iterator JavaDoc iter = registryImpl.getHttpServiceNodes().iterator();
124         while (iter.hasNext()) {
125             final StatsHolder c = (StatsHolder) iter.next();
126             c.registerMBean();
127             logger.finer("DynamicReconfigurator: Now Registering MBean for --- " + c.getName());
128         }
129     }
130     
131     private void unregisterMBeans() {
132         final MonitoringRegistrationHelper registryImpl =
133             (MonitoringRegistrationHelper) MonitoringRegistrationHelper.getInstance();
134         //note that the above refers to the actual implementation rather than interface.
135
136         final Iterator JavaDoc iter = registryImpl.getHttpServiceNodes().iterator();
137         while (iter.hasNext()) {
138             final StatsHolder c = (StatsHolder) iter.next();
139             c.unregisterMBean();
140             logger.finer("DynamicReconfigurator: Now UnRegistering MBean for --- " + c.getName());
141         }
142     }
143
144     private boolean off2Low(MonitoringLevel from, MonitoringLevel to) {
145         return ( from == MonitoringLevel.OFF && to == MonitoringLevel.LOW );
146     }
147     private boolean off2High(MonitoringLevel from, MonitoringLevel to) {
148         return ( from == MonitoringLevel.OFF && to == MonitoringLevel.HIGH );
149     }
150     private boolean low2Off(MonitoringLevel from, MonitoringLevel to) {
151         return ( from == MonitoringLevel.LOW && to == MonitoringLevel.OFF);
152     }
153     private boolean high2Off(MonitoringLevel from, MonitoringLevel to) {
154         return ( from == MonitoringLevel.HIGH && to == MonitoringLevel.OFF );
155     }
156     private boolean low2High(MonitoringLevel from, MonitoringLevel to) {
157         return ( from == MonitoringLevel.LOW && to == MonitoringLevel.HIGH);
158     }
159     private boolean high2Low(MonitoringLevel from, MonitoringLevel to) {
160         return ( from == MonitoringLevel.HIGH && to == MonitoringLevel.LOW );
161     }
162 }
163
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