To make things a easier and more fun, we discuss all the concepts in this book in the context of an imaginary business, a cruise line called Titan. A cruise line makes a particularly interesting example because it incorporates several different businesses: it has ship cabins that are similar to hotel rooms; it serves meals like a restaurant; it offers various recreational opportunities; and it needs to interact with other travel businesses.
This type of business is a good candidate for a distributed object system because many of the systemâs users are geographically dispersed. Commercial travel agents, for example, who need to book passage on Titan ships need to access the reservation system. Supporting manyâpossibly hundredsâof travel agents requires a robust transactional system to ensure agents have access and reservations are completed properly.
Throughout this book, we will build a fairly simple slice of Titanâs EJB system that focuses on the process of making a reservation for a cruise. This exercise will give us an opportunity to develop Ship, Cabin, TravelAgent, ProcessPayment, and other enterprise beans. In the process, you will need to create relational database tables for persisting data used in the example. It is assumed that you are familiar with relational database management systems and that you can create tables according to the SQL statements provided. EJB can be used with any kind of database or legacy application, but the relational database is most commonly understood database technology, so I have chosen this as the persistence layer.
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