SOFTWARE ARCHITECTURE & REFACTORING

Layers in Software Architecture that Every Sofware Architect should Know

Architectures have the same objective — the separation of concerns. They all achieve it by dividing the software into layers. — Uncle Bob

Layers and direction of data flow through them

Layers

Layers are horizontal (don’t get confused with title image) abstract parts of an application. Their boundaries are making a right angle with the data flow. Layers are representing the different levels and types of abstraction of the concerns which accompany software development.

Why Divide the Application into Layers

• Maintains the Single Responsibility Principle.
• Follows Separation of Concerns.
• Isolates development roles & skills. (Presentation Layer — FE dev, Business Layer — BE dev)
• Supports multiple implementations. (Interchangeable Presentation Layer)
• Varying rates of change.
• Slices application to more manageable units.

Layered Architecture Pattern