Dependency Injection Principles, Practices, and Patterns

9 Interception

In this chapter

• Intercepting calls between two collaborating objects
• Understanding the Decorator design pattern
• Applying Cross-Cutting Concerns using Decorators

One of the most interesting things about cooking is the way you can combine many ingredients, some of them not particularly savory in themselves, into a whole that’s greater than the sum of its parts. Often, you start with a simple ingredient that provides the basis for the meal, and then modify and embellish it until the end result is a delicious dish.

Consider a veal cutlet. If you were desperate, you could eat it raw, but in most cases you’d prefer to fry it. But if you slap it on a hot pan, the result will be less than stellar. Apart from the burned flavor, it won’t ...