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/*
* The contents of this file are subject to the terms
* of the Common Development and Distribution License
* (the License). You may not use this file except in
* compliance with the License.
*
* You can obtain a copy of the license at
* https://glassfish.dev.java.net/public/CDDLv1.0.html or
* glassfish/bootstrap/legal/CDDLv1.0.txt.
* See the License for the specific language governing
* permissions and limitations under the License.
*
* When distributing Covered Code, include this CDDL
* Header Notice in each file and include the License file
* at glassfish/bootstrap/legal/CDDLv1.0.txt.
* If applicable, add the following below the CDDL Header,
* with the fields enclosed by brackets [] replaced by
* you own identifying information:
* "Portions Copyrighted [year] [name of copyright owner]"
*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
*/
package javax.jms;
/** The <CODE>TopicRequestor</CODE> helper class simplifies
* making service requests.
*
* <P>The <CODE>TopicRequestor</CODE> constructor is given a non-transacted
* <CODE>TopicSession</CODE> and a destination <CODE>Topic</CODE>. It creates a
* <CODE>TemporaryTopic</CODE> for the responses and provides a
* <CODE>request</CODE> method that sends the request message and waits
* for its reply.
*
* <P>This is a basic request/reply abstraction that should be sufficient
* for most uses. JMS providers and clients are free to create more
* sophisticated versions.
*
* @version 1.0 - 8 July 1998
* @author Mark Hapner
* @author Rich Burridge
*
* @see javax.jms.QueueRequestor
*/
public class TopicRequestor {
TopicSession session; // The topic session the topic belongs to.
Topic topic; // The topic to perform the request/reply on.
TemporaryTopic tempTopic;
TopicPublisher publisher;
TopicSubscriber subscriber;
/** Constructor for the <CODE>TopicRequestor</CODE> class.
*
* <P>This implementation assumes the session parameter to be non-transacted,
* with a delivery mode of either <CODE>AUTO_ACKNOWLEDGE</CODE> or
* <CODE>DUPS_OK_ACKNOWLEDGE</CODE>.
*
* @param session the <CODE>TopicSession</CODE> the topic belongs to
* @param topic the topic to perform the request/reply call on
*
* @exception JMSException if the JMS provider fails to create the
* <CODE>TopicRequestor</CODE> due to some internal
* error.
* @exception InvalidDestinationException if an invalid topic is specified.
*/
public
TopicRequestor(TopicSession session, Topic topic) throws JMSException {
this.session = session;
this.topic = topic;
tempTopic = session.createTemporaryTopic();
publisher = session.createPublisher(topic);
subscriber = session.createSubscriber(tempTopic);
}
/** Sends a request and waits for a reply. The temporary topic is used for
* the <CODE>JMSReplyTo</CODE> destination; the first reply is returned,
* and any following replies are discarded.
*
* @param message the message to send
*
* @return the reply message
*
* @exception JMSException if the JMS provider fails to complete the
* request due to some internal error.
*/
public Message
request(Message message) throws JMSException {
message.setJMSReplyTo(tempTopic);
publisher.publish(message);
return(subscriber.receive());
}
/** Closes the <CODE>TopicRequestor</CODE> and its session.
*
* <P>Since a provider may allocate some resources on behalf of a
* <CODE>TopicRequestor</CODE> outside the Java virtual machine, clients
* should close them when they
* are not needed. Relying on garbage collection to eventually reclaim
* these resources may not be timely enough.
*
* <P>Note that this method closes the <CODE>TopicSession</CODE> object
* passed to the <CODE>TopicRequestor</CODE> constructor.
*
* @exception JMSException if the JMS provider fails to close the
* <CODE>TopicRequestor</CODE> due to some internal
* error.
*/
public void
close() throws JMSException {
// publisher and consumer created by constructor are implicitly closed.
session.close();
tempTopic.delete();
}
}
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