The message-driven bean class, clientsessionmdb-ejb/src/java/mdb/MessageBean.java, is almost identical to the one in Chapter 23, A Message-Driven Bean Example. However, the @MessageDriven annotation is different, because instead of a queue the bean is using a topic with a durable subscription, and it is also using a message selector. Therefore, the annotation sets the activation config properties messageSelector, subscriptionDurability, clientId, and subscriptionName, as follows:
@MessageDriven(mappedName="jms/Topic", activationConfig= { @ActivationConfigProperty(propertyName="messageSelector", propertyValue="NewsType = ’Sports’ OR NewsType = ’Opinion’"), @ActivationConfigProperty( propertyName="subscriptionDurability", propertyValue="Durable"), @ActivationConfigProperty(propertyName="clientId", propertyValue="MyID"), @ActivationConfigProperty(propertyName="subscriptionName", propertyValue="MySub") })
The JMS resource adapter uses these properties to create a connection factory for the message-driven bean that allows the bean to use a durable subscriber.