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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