8.4. Student Message-Driven Bean
Now let's move to an example that uses both publish/subscribe and point-to-point messaging. The example is a Student message-driven bean responding to topic messages broadcast from a School client. The idea is that the School publishes a list of new course topics to students who wish to be notified. Each new course has a name, course code, and price. Suppose a student who is interested in a new course uses a JSP program to “sign up” by recording his or her name and e-mail address in a database. When the School publishes a list of new courses, the Student bean checks the price of each course. If it's affordable, the Student bean reads the database and sends e-mail to each student with the new course information. ...
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