Chapter 14. The Loan subsystem
14.1 Introduction
In this chapter we look at the OLAS Loan subsystem. This subsystem encapsulates all the OLAS functionality around lending and returning books and other items from the normalCatalog. This is is the final OLAS subsystem that we will model, and it will bring together all the work we have done previously.
In some ways, Loan is the most complex of all the OLAS subsystems. Whereas the other subsystems were primarily about maintaining persistent data (CRUD), and applying business rules about access to those data, the Loan subsystem has rich dynamic behavior that we must model accurately to get the system right. Some of this behavior can be assigned to classes in the Loan subsystem, whilst some of it must ...
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