O'Reilly - Java Message Service

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Hot Deals Topic
jms/HotDeals
javax.jms.Topic
Java Message Service
When the component is deployed, the J2EE vendor tools generate code to translate the
JNDI ENC resource references into JMS-administered objects. This translation is done
when the bean is deployed using administration tools.
Any J2EE component can access JMS connection factories and destinations using the
JNDI ENC. As an example, the Wholesaler client can be rewritten as a stateless session
bean that uses the JNDI ENC to obtain a JMS connection factory and destination:
public class WholesalerBean implements javax.ejb.SessionBean{
}
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public void setSessionContext(SessionContext cntx){
try {
InitialContext jndiEnc = new InitialContext( );
TopicConnectionFactory factory = (TopicConnectionFactory)
jndiEnc.lookup("java:comp/env/jms/broker");
connect = factory.createTopicConnection (username, password);
session =
connect.createTopicSession(false,Session.AUTO_ACKNOWLEDGE);
hotDealsTopic=(Topic)
jndiEnc.lookup("java:comp/env/jms/HotDeals");
publisher = session.createPublisher(hotDealsTopic);
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}
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}
public void publishPriceQuotes(String dealDesc, String username,
String itemDesc, float oldPrice,
float newPrice){
try {
javax.jms.StreamMessage message =
session.createStreamMessage( );
message.writeString(dealDesc);
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publisher.publish(
message,
javax.jms.DeliveryMode.PERSISTENT,
javax.jms.Message.DEFAULT_PRIORITY,
1800000);
} catch ( javax.jms.JMSException jmse ){
jmse.printStackTrace( );
}
}
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