1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
|
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.tomcat.util.modeler;
import java.util.ArrayList;
import java.util.Iterator;
import javax.management.ListenerNotFoundException;
import javax.management.MBeanNotificationInfo;
import javax.management.Notification;
import javax.management.NotificationBroadcaster;
import javax.management.NotificationFilter;
import javax.management.NotificationListener;
/**
* <p>Implementation of <code>NotificationBroadcaster</code> for attribute
* change notifications. This class is used by <code>BaseModelMBean</code> to
* handle notifications of attribute change events to interested listeners.
*</p>
*
* @author Craig R. McClanahan
* @author Costin Manolache
*/
public class BaseNotificationBroadcaster implements NotificationBroadcaster {
// ----------------------------------------------------------- Constructors
// ----------------------------------------------------- Instance Variables
/**
* The set of registered <code>BaseNotificationBroadcasterEntry</code>
* entries.
*/
protected ArrayList<BaseNotificationBroadcasterEntry> entries =
new ArrayList<BaseNotificationBroadcasterEntry>();
// --------------------------------------------------------- Public Methods
/**
* Add a notification event listener to this MBean.
*
* @param listener Listener that will receive event notifications
* @param filter Filter object used to filter event notifications
* actually delivered, or <code>null</code> for no filtering
* @param handback Handback object to be sent along with event
* notifications
*
* @exception IllegalArgumentException if the listener parameter is null
*/
@Override
public void addNotificationListener(NotificationListener listener,
NotificationFilter filter,
Object handback)
throws IllegalArgumentException {
synchronized (entries) {
// Optimization to coalesce attribute name filters
if (filter instanceof BaseAttributeFilter) {
BaseAttributeFilter newFilter = (BaseAttributeFilter) filter;
Iterator<BaseNotificationBroadcasterEntry> items =
entries.iterator();
while (items.hasNext()) {
BaseNotificationBroadcasterEntry item = items.next();
if ((item.listener == listener) &&
(item.filter != null) &&
(item.filter instanceof BaseAttributeFilter) &&
(item.handback == handback)) {
BaseAttributeFilter oldFilter =
(BaseAttributeFilter) item.filter;
String newNames[] = newFilter.getNames();
String oldNames[] = oldFilter.getNames();
if (newNames.length == 0) {
oldFilter.clear();
} else {
if (oldNames.length != 0) {
for (int i = 0; i < newNames.length; i++)
oldFilter.addAttribute(newNames[i]);
}
}
return;
}
}
}
// General purpose addition of a new entry
entries.add(new BaseNotificationBroadcasterEntry
(listener, filter, handback));
}
}
/**
* Return an <code>MBeanNotificationInfo</code> object describing the
* notifications sent by this MBean.
*/
@Override
public MBeanNotificationInfo[] getNotificationInfo() {
return (new MBeanNotificationInfo[0]);
}
/**
* Remove a notification event listener from this MBean.
*
* @param listener The listener to be removed (any and all registrations
* for this listener will be eliminated)
*
* @exception ListenerNotFoundException if this listener is not
* registered in the MBean
*/
@Override
public void removeNotificationListener(NotificationListener listener)
throws ListenerNotFoundException {
synchronized (entries) {
Iterator<BaseNotificationBroadcasterEntry> items =
entries.iterator();
while (items.hasNext()) {
BaseNotificationBroadcasterEntry item = items.next();
if (item.listener == listener)
items.remove();
}
}
}
/**
* Remove a notification event listener from this MBean.
*
* @param listener The listener to be removed (any and all registrations
* for this listener will be eliminated)
* @param handback Handback object to be sent along with event
* notifications
*
* @exception ListenerNotFoundException if this listener is not
* registered in the MBean
*/
public void removeNotificationListener(NotificationListener listener,
Object handback)
throws ListenerNotFoundException {
removeNotificationListener(listener);
}
/**
* Remove a notification event listener from this MBean.
*
* @param listener The listener to be removed (any and all registrations
* for this listener will be eliminated)
* @param filter Filter object used to filter event notifications
* actually delivered, or <code>null</code> for no filtering
* @param handback Handback object to be sent along with event
* notifications
*
* @exception ListenerNotFoundException if this listener is not
* registered in the MBean
*/
public void removeNotificationListener(NotificationListener listener,
NotificationFilter filter,
Object handback)
throws ListenerNotFoundException {
removeNotificationListener(listener);
}
/**
* Send the specified notification to all interested listeners.
*
* @param notification The notification to be sent
*/
public void sendNotification(Notification notification) {
synchronized (entries) {
Iterator<BaseNotificationBroadcasterEntry> items =
entries.iterator();
while (items.hasNext()) {
BaseNotificationBroadcasterEntry item = items.next();
if ((item.filter != null) &&
(!item.filter.isNotificationEnabled(notification)))
continue;
item.listener.handleNotification(notification, item.handback);
}
}
}
}
/**
* Utility class representing a particular registered listener entry.
*/
class BaseNotificationBroadcasterEntry {
public BaseNotificationBroadcasterEntry(NotificationListener listener,
NotificationFilter filter,
Object handback) {
this.listener = listener;
this.filter = filter;
this.handback = handback;
}
public NotificationFilter filter = null;
public Object handback = null;
public NotificationListener listener = null;
}
|
