Question

In Hexagonal Architecture, what specific component acts as the translation layer between an external protocol, such as a REST API, and the internal application business logic?

Accepted Answer

In Hexagonal Architecture, the specific component that acts as the translation layer between an external protocol, such as a REST API, and the internal business logic is called a primary adapter or an incoming adapter. Hexagonal Architecture, also known as Ports and Adapters, separates the core business logic from external concerns by using an interface known as a port. An adapter implements this port to translate the technology-specific details of an external request into a format that the internal application can understand. For example, a REST controller acts as an adapter that receives an HTTP request, extracts the relevant data, and calls the corresponding method on the application service port. By doing this, the internal business logic remains agnostic of the transport mechanism, meaning the logic does not know or care if the request came from a REST API, a command-line interface, or a message queue. This separation ensures that the core application remains isolated and testable regardless of changes to external interfaces.

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In Hexagonal Architecture, what specific component acts as the translation layer between an external protocol, such as a REST API, and the internal application business logic?