Layered Architecture
Layered architecture is a popular design pattern that is widely used in software development. It provides a clear separation of concerns between different parts of the application and promotes modularity, scalability, and maintainability.
In a layered architecture, each layer has a specific responsibility and is loosely coupled with the layers above and below it. This means that changes in one layer should not affect the other layers, and each layer can be replaced or modified without affecting the overall architecture. This makes the application easier to understand, test, and maintain.
Let's take a closer look at the different layers in a typical layered architecture for a Spring Boot application:
- Presentation Layer: Responsible for presenting information to the user and interpreting user commands.
- Application Layer: This layer coordinates the application activity. It doesn't contain any business logic. It does not hold the state of business objects, but it can hold the state of an application task's progress.
- Domain Layer: This layer contains information about the business domain. The state of business objects is held here. Persistence of the business objects and possibly their state is delegated to the infrastructure layer.
- Infrastructure Layer: This layer acts as a supporting library for all the other layers. It provides communication between layers, implements persistence for business objects, contains supporting libraries for the user interface layer, etc.
In a layered architecture, each layer is responsible for a specific aspect of the application and should not depend on any other layers except for the layer immediately beneath it. This promotes modularity and makes the application easier to test and maintain.