01: /*
02: * JBoss, Home of Professional Open Source.
03: * Copyright 2006, Red Hat Middleware LLC, and individual contributors
04: * as indicated by the @author tags. See the copyright.txt file in the
05: * distribution for a full listing of individual contributors.
06: *
07: * This is free software; you can redistribute it and/or modify it
08: * under the terms of the GNU Lesser General Public License as
09: * published by the Free Software Foundation; either version 2.1 of
10: * the License, or (at your option) any later version.
11: *
12: * This software is distributed in the hope that it will be useful,
13: * but WITHOUT ANY WARRANTY; without even the implied warranty of
14: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15: * Lesser General Public License for more details.
16: *
17: * You should have received a copy of the GNU Lesser General Public
18: * License along with this software; if not, write to the Free
19: * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20: * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
21: */
22: package org.jboss.management.mejb;
23:
24: import javax.management.Notification;
25: import java.util.ArrayList;
26: import java.util.List;
27:
28: /**
29: * Remote Listener using Polling to send the event
30: *
31: * @author ???
32: * @version $Revision: 57197 $
33: * @jmx:mbean extends="org.jboss.management.mejb.ListenerMBean"
34: */
35: public class PollingNotificationListener implements
36: PollingNotificationListenerMBean {
37: private List mList;
38: private int mMaximumSize = 1000;
39:
40: public PollingNotificationListener(int pListSize,
41: int pMaximumListSize) {
42: if (pListSize <= 0) {
43: pListSize = 1000;
44: }
45: mList = new ArrayList(pListSize);
46: if (pMaximumListSize > 0 && pMaximumListSize > pListSize) {
47: mMaximumSize = pMaximumListSize;
48: }
49: }
50:
51: /**
52: * Handles the given notification by sending this to the remote
53: * client listener
54: *
55: * @param pNotification Notification to be send
56: * @param pHandback Handback object
57: */
58: public void handleNotification(Notification pNotification,
59: Object pHandback) {
60: synchronized (mList) {
61: if (mList.size() <= mMaximumSize) {
62: mList.add(pNotification);
63: }
64: }
65: }
66:
67: //
68: // jason: this is illegal usage of attributes, drop the no-args version
69: //
70:
71: /**
72: * @jmx:managed-attribute
73: */
74: public List getNotifications() {
75: return getNotifications(mMaximumSize);
76: }
77:
78: /**
79: * @jmx:managed-attribute
80: */
81: public List getNotifications(int pMaxiumSize) {
82: List lReturn = null;
83: synchronized (mList) {
84: pMaxiumSize = pMaxiumSize > mList.size() ? mList.size()
85: : pMaxiumSize;
86: lReturn = new ArrayList(mList.subList(0, pMaxiumSize));
87: mList.removeAll(lReturn);
88: }
89:
90: return lReturn;
91: }
92:
93: }
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