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;
056:
057: import java.io.Serializable;
058: import java.net.InetAddress;
059: import java.util.HashMap;
060: import java.util.Iterator;
061: import java.util.LinkedList;
062: import java.util.List;
063: import java.util.Map;
064:
065: import org.apache.log4j.Logger;
066:
067: import org.lateralnz.common.util.Constants;
068: import org.lateralnz.common.util.StringUtils;
069:
070: /**
071: * an abstract message handler that implements the supporting regex methods
072: *
073: * @author J R Briggs
074: */
075: public abstract class AbstractMessageHandler implements MessageHandler,
076: Constants, Serializable {
077: private static final Logger log = Logger
078: .getLogger(AbstractMessageHandler.class.getName());
079:
080: protected Map listeners = new HashMap(); // a map of listeners (who want to receive events)
081:
082: protected InetAddress addr = null;
083: protected int port;
084: private String allowedRegex = null;
085: private String disallowedRegex = null;
086: private int allowedPriority = 1;
087: private int disallowedPriority = 0;
088: private boolean allowed = true;
089:
090: public synchronized void addListener(String group,
091: MessageListener listener) {
092: List l = (List) listeners.get(group);
093: if (l == null) {
094: l = new LinkedList();
095: listeners.put(group, l);
096: }
097: l.add(listener);
098: }
099:
100: public void notifyListeners(final Message msg) {
101: // if there are listeners registered for the group,
102: // send the event to them
103: if (listeners.containsKey(msg.getGroup())) {
104: Thread t = new Thread() {
105: public void run() {
106: List l = (List) listeners.get(msg.getGroup());
107: Iterator iter = l.iterator();
108: while (iter.hasNext()) {
109: MessageListener list = (MessageListener) iter
110: .next();
111: list.handle(msg);
112: }
113: }
114: };
115: t.start();
116: }
117: }
118:
119: /**
120: * the inet address this handler is running against
121: */
122: public void setAddress(InetAddress addr, int port) {
123: this .addr = addr;
124: this .port = port;
125: }
126:
127: public void setAllowedGroupRegex(String regex, int priority) {
128: this .allowedRegex = regex;
129: this .allowedPriority = priority;
130:
131: if (this .allowedPriority > this .disallowedPriority) {
132: allowed = true;
133: }
134: }
135:
136: public void setDisallowedGroupRegex(String regex, int priority) {
137: this .disallowedRegex = regex;
138: this .disallowedPriority = priority;
139:
140: if (this .disallowedPriority > this .allowedPriority) {
141: allowed = false;
142: }
143: }
144:
145: public boolean willTransmit(String group) {
146: // if allowed has a higher priority
147: if (allowed && allowedRegex != null
148: && StringUtils.matches(group, allowedRegex)) {
149: return true;
150: }
151: // disallowed must have a higher priority, so that is checked
152: // first
153: else if (disallowedRegex != null
154: && StringUtils.matches(group, disallowedRegex)) {
155: return false;
156: } else {
157: // for everything else return true
158: return true;
159: }
160: }
161: }
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