| /* |
| * 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(); |
| } |
| } |