Java Message Service, 2nd Edition

Message Selector Examples

The following are four selectors used in hypothetical environments. Although you will have to use a little imagination, the purpose of these examples is to convey the power of the message selectors. Notice in these examples that a message selector can be applied to both the publish-and-subscribe model and the point-to-point model.

Managing Claims in an HMO

Due to some fraudulent claims, an automatic process is implemented that will audit all claims submitted by patients who are employees of the ACME manufacturing company with visits to chiropractors, psychologists, and dermatologists:

String selector = 
  "PhysicianType IN ('Chiropractor', 'Psychologist', 'Dermatologist') "
              + "AND PatientGroupID LIKE 'ACME%'";

TopicSubscriber subscriber = 
   session.createSubscriber(topic, selector, false);

Notification of Certain Bids on Inventory

A supplier wants notification of requests for bids on specific inventory items at specific quantities:

String selector = 
  "InventoryID = 'S93740283-02' AND Quantity BETWEEN 1000 AND 13000";

TopicSubscriber subscriber = 
   session.createSubscriber(topic, selector, false);

Priority Handling

A supplier receiving orders handles two types of customers: gold and silver. Since the priority and handing of orders differs greatly between these customer types, the online supplier has different processes to handle gold customers and silver customers, even though all orders are sent to the same queue. Priority handling is offered to gold customers or those ...