Layered Architecture Pattern

The layered architecture pattern is a widely used approach in software design, where components(code) are organized into distinct layers of subtasks, arranged hierarchically. Each layer performs specific functions and operates independently of the others, enabling modifications within a layer without impacting the rest. This pattern, often referred to as 'N-tier architecture,' is prevalent in the design of many software systems and typically comprises four primary layers.

Layers of the Pattern

• Presentation Layer: This is the user interface layer, where users interact with the application by entering and viewing data.
• Business Layer: Responsible for executing business logic according to the application's requirements.
• Application Layer: Acts as an intermediary, facilitating communication between the presentation and data layers.
• Data Layer: Manages data storage and retrieval, often involving databases.

Advantages

• Scalability: Each layer can be scaled independently, allowing for performance optimization without affecting the entire system.
• Flexibility: Different technologies can be implemented within each layer without impacting others, promoting innovation and adaptation.
• Maintainability: Since layers are independent, changes or updates in one layer do not necessarily affect the others, simplifying maintenance.

Disadvantages

• Complexity: Introducing additional layers can increase system complexity, making it more challenging to manage.
• Performance Overhead: Multiple layers can introduce latency due to the additional communication required between them.
• Strict Layer Separation: Enforcing strict separation can sometimes lead to inefficiencies and increased development effort.