Design Patterns Explained: A New Perspective on Object-Oriented Design

Part V: Handling Variations with Design Patterns

Part Overview

In this part, I work through another case study. In this case study, I will consider the requirements for the problem one at a time, rather than specifying every requirement up front. I will describe a system that is currently working when a new requirement comes in that forces me to find the best way to modify the code. I will use this process to present a few new design patterns—one for each new requirement.

Chapter	Discusses These Topics
14	The Strategy pattern: How to handle varying algorithms and business rules.
15	The Decorator pattern: How to dynamically add behavior before or after an object's current behavior.
16	The Singleton pattern and the Double-Checked Locking pattern: ...