Coding the Message-Driven Bean: MessageBean.java

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.