interractor

An interactor is a design pattern used in software development, particularly in the context of test-driven development (TDD) and clean architecture. The primary purpose of an interactor is to encapsulate a specific business rule or action that an application can perform. It acts as a bridge between the presentation layer (e.g., a UI) and the domain layer (the core business logic and entities).

Interactiors are designed to be single-purpose, meaning each interactor should ideally handle one distinct operation. This makes them easy to understand, test, and maintain. When a user action or system event occurs, the presentation layer typically invokes the appropriate interactor. The interactor then orchestrates the necessary steps, which might involve fetching data from repositories, performing calculations, and updating domain entities.

A key benefit of the interactor pattern is its ability to decouple the presentation from the business logic. This separation allows for easier testing of the business rules in isolation, without needing to set up a full UI or external dependencies. It also promotes reusability, as the same interactor can be called from different parts of the application or even by different presentation layers (e.g., a web UI and a mobile app). By keeping business logic in dedicated interactors, applications become more organized, testable, and adaptable to change.