001/*
002The contents of this file are subject to the Mozilla Public License Version 1.1 
003(the "License"); you may not use this file except in compliance with the License. 
004You may obtain a copy of the License at http://www.mozilla.org/MPL/ 
005Software distributed under the License is distributed on an "AS IS" basis, 
006WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for the 
007specific language governing rights and limitations under the License. 
008
009The Original Code is "JMSTopicAdapter.java".  Description: 
010"An implementation of JMSDestination that uses an underlying Topic." 
011
012The Initial Developer of the Original Code is University Health Network. Copyright (C) 
0132004.  All Rights Reserved. 
014
015Contributor(s): ______________________________________. 
016
017Alternatively, the contents of this file may be used under the terms of the 
018GNU General Public License (the "GPL"), in which case the provisions of the GPL are 
019applicable instead of those above.  If you wish to allow use of your version of this 
020file only under the terms of the GPL and not to allow others to use your version 
021of this file under the MPL, indicate your decision by deleting  the provisions above 
022and replace  them with the notice and other provisions required by the GPL License.  
023If you do not delete the provisions above, a recipient may use your version of 
024this file under either the MPL or the GPL. 
025*/
026
027package ca.uhn.hl7v2.protocol.impl;
028
029import javax.jms.Connection;
030import javax.jms.JMSException;
031import javax.jms.Message;
032import javax.jms.Session;
033import javax.jms.TextMessage;
034import javax.jms.Topic;
035import javax.jms.TopicConnection;
036import javax.jms.TopicPublisher;
037import javax.jms.TopicSession;
038import javax.jms.TopicSubscriber;
039
040import ca.uhn.hl7v2.protocol.JMSDestination;
041
042/**
043 * An implementation of <code>JMSDestination</code> that uses an underlying 
044 * Topic.
045 *   
046 * @author <a href="mailto:bryan.tripp@uhn.on.ca">Bryan Tripp</a>
047 * @version $Revision: 1.1 $ updated on $Date: 2007-02-19 02:24:26 $ by $Author: jamesagnew $
048 */
049public class JMSTopicAdapter implements JMSDestination {
050
051    private TopicSession mySendingSession;
052    private TopicSession myReceivingSession; 
053    private TopicPublisher myPublisher;
054    private TopicSubscriber mySubscriber;
055    private TopicConnection myConnection;
056    private Topic myTopic;
057    private String myMessageSelector;
058    private boolean myIsConnected;
059
060    /**
061     * @param theConnection the connection over which messages are written and read 
062     * @param theDestination the destination to/from which messages are written/read
063     */
064    public JMSTopicAdapter(TopicConnection theConnection, Topic theDestination) {
065        myConnection = theConnection;
066        myTopic = theDestination;
067    }
068
069    /**
070     * @param theConnection the connection over which messages are written and read 
071     * @param theDestination the destination to/from which messages are written/read
072     * @param theMessageSelector a JMS message selector which restricts the inbound 
073     *      messages that are received (see JMS docs)
074     */
075    public JMSTopicAdapter(TopicConnection theConnection, Topic theDestination, String theMessageSelector) {
076        myConnection = theConnection;
077        myTopic = theDestination;
078        myMessageSelector = theMessageSelector;
079    }
080
081    /** 
082     * @see ca.uhn.hl7v2.protocol.JMSDestination#getName()
083     */
084    public String getName() throws JMSException {
085        return myTopic.getTopicName();
086    }
087
088    /**
089     * @see ca.uhn.hl7v2.protocol.JMSDestination#createMessage()
090     */
091    public TextMessage createMessage() throws JMSException {
092        return mySendingSession.createTextMessage();
093    }
094
095    /**
096     * @see ca.uhn.hl7v2.protocol.JMSDestination#connect()
097     */
098    public void connect() throws JMSException {
099        boolean transacted = false;
100        int ackMode = Session.AUTO_ACKNOWLEDGE;
101
102        disconnect();
103        
104        mySendingSession = myConnection.createTopicSession(transacted, ackMode);
105        myPublisher = mySendingSession.createPublisher(myTopic);
106
107        myReceivingSession = myConnection.createTopicSession(transacted, ackMode);
108        mySubscriber = myReceivingSession.createSubscriber(myTopic);
109        
110        myIsConnected = true;
111    }
112
113    /**
114     * @see ca.uhn.hl7v2.protocol.JMSDestination#disconnect()
115     */
116    public void disconnect() throws JMSException {
117        myIsConnected = false;
118        
119        if (mySendingSession != null) {
120            mySendingSession.close();
121        }
122        if (myReceivingSession != null) {
123            myReceivingSession.close();
124        }
125    }
126
127    /**
128     * @see ca.uhn.hl7v2.protocol.JMSDestination#isConnected()
129     */
130    public boolean isConnected() {
131        return myIsConnected;
132    }
133
134    /** 
135     * @see ca.uhn.hl7v2.protocol.JMSDestination#send(javax.jms.Message)
136     */
137    public void send(Message theMessage) throws JMSException {
138        myPublisher.publish(theMessage);
139    }
140
141    /**
142     * @see ca.uhn.hl7v2.protocol.JMSDestination#receive()
143     */
144    public Message receive() throws JMSException {
145        return mySubscriber.receive();
146    }
147
148    /**
149     * @see ca.uhn.hl7v2.protocol.JMSDestination#getConnection()
150     */
151    public Connection getConnection() {
152        return myConnection;
153    }
154
155}