DreiSchichtenArchitekturen

DreiSchichtenArchitekturen, also known as Three-Tier Architectures, is a software design pattern that separates an application into three logical and physical computing tiers. This separation allows for a modular and scalable system. The three tiers are typically the Presentation Layer, the Logic Layer (also called the Application Layer or Business Layer), and the Data Layer.

The Presentation Layer is the user interface, responsible for displaying information to the user and accepting their input. This could be a web browser, a desktop application, or a mobile app. It does not contain any business logic or data access code.

The Logic Layer contains the core business rules and logic of the application. It processes user requests, performs calculations, and makes decisions. This layer communicates with both the Presentation Layer and the Data Layer, acting as an intermediary.

The Data Layer is responsible for storing and retrieving data. This typically involves a database management system. The Logic Layer interacts with the Data Layer to save and fetch information, but the Presentation Layer usually does not have direct access to the data.

This architectural style offers several advantages. It improves maintainability by allowing developers to modify one tier without affecting the others. It enhances scalability by enabling individual tiers to be scaled independently based on demand. Security can also be improved as the data access is centralized and controlled by the Logic Layer. Finally, it promotes reusability, as business logic can be accessed by multiple presentation interfaces.