Using BPEL to implement fleet management

The following section describes the concepts and patterns that have been chosen to implement the new fleet management.

Solution concepts

The fleet management component is categorized as a business activity service (also see Chapter 4, Process-driven Service Design, for more details about service categorization). It integrates several backend systems, for example, the reservation system, booking system, and customer management. The component offers a wide range of operations that cover different aspects of the rental process, such as the booking of vehicles, availability check, and rental management. Since some of those operations are asynchronous and stateful, it has been decided that fleet management should be implemented as a BPEL composite.

Figure 5: Fleet management component view

As illustrated in Figure 5, the composite consists of Operation Delegator implemented in BPEL that routes between the different operations provided by the service facade...