Source Code Cross Referenced for MulticastMessageHandlerFactory.java in  » J2EE » panther » org » lateralnz » messaging » multicast » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » panther » org.lateralnz.messaging.multicast 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* ====================================================================
002:         * The LateralNZ Software License, Version 1.0
003:         *
004:         * Copyright (c) 2003 LateralNZ.  All rights reserved.
005:         *
006:         * Redistribution and use in source and binary forms, with or without
007:         * modification, are permitted provided that the following conditions
008:         * are met:
009:         *
010:         * 1. Redistributions of source code must retain the above copyright
011:         *    notice, this list of conditions and the following disclaimer.
012:         *
013:         * 2. Redistributions in binary form must reproduce the above copyright
014:         *    notice, this list of conditions and the following disclaimer in
015:         *    the documentation and/or other materials provided with the
016:         *    distribution.
017:         *
018:         * 3. The end-user documentation included with the redistribution,
019:         *    if any, must include the following acknowledgment:
020:         *       "This product includes software developed by 
021:         *        LateralNZ (http://www.lateralnz.org/) and other third parties."
022:         *    Alternately, this acknowledgment may appear in the software itself,
023:         *    if and wherever such third-party acknowledgments normally appear.
024:         *
025:         * 4. The names "LateralNZ" must not be used to endorse or promote 
026:         *    products derived from this software without prior written 
027:         *    permission. For written permission, please 
028:         *    contact oss@lateralnz.org.
029:         *
030:         * 5. Products derived from this software may not be called "Panther", 
031:         *    or "Lateral" or "LateralNZ", nor may "PANTHER" or "LATERAL" or 
032:         *    "LATERALNZ" appear in their name, without prior written 
033:         *    permission of LateralNZ.
034:         *
035:         * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
036:         * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
037:         * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
038:         * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
039:         * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
040:         * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
041:         * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
042:         * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
043:         * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
044:         * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
045:         * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
046:         * SUCH DAMAGE.
047:         * ====================================================================
048:         *
049:         * This software consists of voluntary contributions made by many
050:         * individuals on behalf of LateralNZ.  For more
051:         * information on Lateral, please see http://www.lateralnz.com/ or
052:         * http://www.lateralnz.org
053:         *
054:         */
055:        package org.lateralnz.messaging.multicast;
056:
057:        import java.util.Map;
058:        import java.util.HashMap;
059:        import java.util.ResourceBundle;
060:
061:        import org.apache.log4j.Logger;
062:
063:        import org.lateralnz.common.util.ResourceUtils;
064:        import org.lateralnz.common.util.StringUtils;
065:        import org.lateralnz.messaging.Message;
066:        import org.lateralnz.messaging.MessageHandler;
067:        import org.lateralnz.messaging.MessageListener;
068:
069:        /**
070:         * factory class for notification handlers, so we don't have to instantiate multiple copies.
071:         * (in other words, there should be only one notification handler in a VM per IP address & port)
072:         *
073:         * @author J R Briggs
074:         */
075:        public class MulticastMessageHandlerFactory {
076:            private static final Logger log = Logger
077:                    .getLogger(MulticastMessageHandlerFactory.class.getName());
078:            private static MulticastMessageHandlerFactory obj = new MulticastMessageHandlerFactory();
079:            private static ResourceBundle resources = ResourceUtils
080:                    .getStaticBundle(MulticastMessageHandlerFactory.class);
081:
082:            private String defaultAddress = null;
083:            private int defaultPort = 5555;
084:
085:            private Map handlers = new HashMap();
086:
087:            private MulticastMessageHandlerFactory() {
088:            }
089:
090:            public static final MulticastMessageHandlerFactory getInstance() {
091:                return obj;
092:            }
093:
094:            /**
095:             * get the handler with the specified ip address and port
096:             */
097:            public MessageHandler getHandler(String ipaddress, int port)
098:                    throws Exception {
099:                String key = ipaddress + port;
100:                if (!handlers.containsKey(key)) {
101:                    synchronized (handlers) {
102:                        if (!handlers.containsKey(key)) {
103:                            handlers.put(key, new MulticastMessageHandler(
104:                                    ipaddress, port));
105:                        }
106:                    }
107:                }
108:                return (MessageHandler) handlers.get(key);
109:            }
110:
111:            /**
112:             * get the default handler
113:             */
114:            public MessageHandler getDefaultHandler() throws Exception {
115:                if (StringUtils.isEmpty(defaultAddress)) {
116:                    defaultAddress = resources.getString("default_address");
117:                    defaultPort = Integer.parseInt(resources
118:                            .getString("default_port"));
119:                }
120:                return getHandler(defaultAddress, defaultPort);
121:            }
122:
123:            // testing purposes
124:            public static final void main(String[] args) {
125:                try {
126:                    MessageHandler nh = MulticastMessageHandlerFactory
127:                            .getInstance().getHandler("224.0.0.150", 5555);
128:
129:                    MessageListener nl1 = new MessageListener() {
130:                        public void handle(Message event) {
131:                            System.out.println("received " + event);
132:                        }
133:                    };
134:
135:                    nh.addListener("test", nl1);
136:
137:                    Thread.sleep(1000);
138:                    if (args.length > 0) {
139:                        for (int i = 0; i < 1000; i++) {
140:                            nh.send(new Message(1, "test", "hello" + i));
141:                        }
142:                    }
143:                } catch (Exception e) {
144:                    e.printStackTrace();
145:                }
146:            }
147:        }
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