All software applications have various concerns, which are groupings of logic and functionality. Some of that functionality, known as cross-cutting concerns, is used in multiple areas of the application.
In this chapter, we will explore cross-cutting concerns and some general guidelines for handling them. We will take a look at different ways to implement them, including using dependency injection (DI), the decorator pattern, and aspect-oriented programming (AOP).
We'll go over some examples of cross-cutting concerns as well as some of the special considerations that should be made when dealing with cross-cutting concerns within microservices.
In this chapter, we will cover the following topics:
- Cross-cutting concerns
- General guidelines for cross-cutting concerns
- Implementing cross-cutting concerns with the use of DI and the decorator pattern
- Aspect-oriented programming
- Taking a look at various types of cross-cutting concerns
- Cross-cutting concerns for microservices, including the use of a microservice chassis and the sidecar pattern