8. Implementing Business Rules

Do not fold, spindle, or mutilate.

Anonymous, instructions on computer punch cards

The Big Pay-Off

This chapter shows how to implement business rules in programming code. In a sense, this chapter is what the whole book has been building toward. Previous chapters showed how to choose objects, define business rules, and code objects using the collaboration patterns. This chapter shows how to enforce real-world business rules with object methods organized by the collaboration patterns. Writing code without business rules is like solving physics problems without considering air resistance. This chapter considers air resistance. Sure, it takes a little more effort, but without it, your parachute would not work.

Get Streamlined Object Modeling: Patterns, Rules, and Implementation now with the O’Reilly learning platform.

O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.