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handle these exceptions by removing the bean instance and rolling back any transaction started by the bean instance or by the container.
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Threading and Concurrency An MDB instance is assumed to execute in a single thread of control. The EJB container will guarantee this behavior. In addition, the EJB container may provide a mode of operation that allows multiple messages to be handled concurrently by separate bean instances. This deployment option utilizes expert level classes that are defined in the JMS specification. The JMS provider is not required to provide implementations for these classes, so the EJB container may not be able to take advantage of them with every JMS implementation. Using these classes involves a trade-off between performance and serialization of messages delivered to the server. Message Acknowledgment The container always handles message acknowledgment for MDBs. It is prohibited for the bean to use any message acknowledgment methods for example, acknowledge() or rollback(). The message acknowledgment can be set to either AUTO_ACKNOWLEDGE, allowing the message to be delivered once, or DUPS_OK_ACKNOWLEDGE, allowing the delivery of duplicate messages after a failure. Note that if a bean has the Required transaction attribute, it will process the onMessage() method inside a transaction. Because the MDB has no client, no security principal is propagated to the EJB container on receipt of a message. The EJB framework provides facilities for a bean method to execute in a role specified in the deployment descriptor. As a result, the MDB can be configured to execute within a security context that can then be propagated to other EJBs that are called during the processing of a message.
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In the following example code, the publishing client publishes simple messages to a topic. The subscribing MDB client receives the simple messages from the topic. Note that the JNDI name for the connection factory and the topic will differ per the messaging vendor and site naming convention. Here is the code for the publishing client:
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package javaee.architect; import javax.naming.*; import javax.jms.*; public class PSMDBPublish { private static final String THIS = "PSMDBPublish"; public static final String JMS_FACTORY = "myTopicConnectionFactory";
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public static final String TOPIC = "myTopic3"; public static void main(String[] args) throws Exception { // get the initial context InitialContext ctx = new InitialContext(System.getProperties()); // lookup the topic connection factory TopicConnectionFactory tconnf = (TopicConnectionFactory) ctx.lookup(JMS_FACTORY); // create a topic connection TopicConnection tconn = tconnf.createTopicConnection(); // create a topic session TopicSession tsess = tconn.createTopicSession(false, Session.AUTO_ACKNOWLEDGE); // lookup the topic object Topic topic = (Topic) ctx.lookup(TOPIC); // create a topic publisher TopicPublisher tpublish = tsess.createPublisher(topic); tpublish.setDeliveryMode(DeliveryMode.NON_PERSISTENT); // start the connection tconn.start(); log("Started."); // create a simple message TextMessage tmsg = tsess.createTextMessage(); // publish the messages tmsg.setText("Market open."); tpublish.publish(tmsg); log(tmsg.getText()); tmsg.setText("Market closed."); tpublish.publish(tmsg); log(tmsg.getText()); tmsg.setText("After hours market open."); tpublish.publish(tmsg); log(tmsg.getText()); tmsg.setText("After hours market closed."); tpublish.publish(tmsg); log(tmsg.getText()); // close up tpublish.close(); tsess.close(); tconn.close(); ctx.close(); log("Finished."); } private static void log(String msg) { System.out.println(new java.util.Date()+" "+THIS+" "+msg); } }
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Here is the code for the subscribing MDB client:
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package javaee.architect; import javax.ejb.*; import javax.jms.*; public class PSMDBSubscribe implements MessageDrivenBean, MessageListener { private static final String THIS = "PSMDBSubscribe"; protected MessageDrivenContext ctx; // Associate bean instance with a particular context. public void setMessageDrivenContext(MessageDrivenContext ctx) { this.ctx = ctx; } // When the bean is initialized. public void ejbCreate() { log("ejbCreate()"); } // When the bean is destroyed. public void ejbRemove() { log("ejbRemove()"); } // main business method. public void onMessage(Message msg) { try { // This class processes TextMessages. if (msg instanceof TextMessage) { log(((TextMessage) msg).getText()); } } catch (Exception e) { log("Can't receive message: " + e); } } private void log(String msg) { System.out.println(new java.util.Date()+" "+THIS+" "+msg); } }
Here is the deployment descriptor for the subscribing MDB client:
<!DOCTYPE ejb-jar PUBLIC "-//Sun Microsystems, Inc.//DTD Enterprise JavaBeans 2.0//EN" "http://java.sun.com/dtd/ejb-jar_2_0.dtd"> <ejb-jar> <enterprise-beans> <message-driven> <ejb-name>PSMDB</ejb-name> <ejb-class>javaee.architect.PSMDBSubscribe</ejb-class> <transaction-type>Container</transaction-type> <message-driven-destination> <destination-type>javax.jms.Topic</destination-type> </message-driven-destination> </message-driven> </enterprise-beans> </ejb-jar>
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