Hexagonal Architecture (http://alistair.cockburn.us/Hexagonal+architecture), as shown in the following diagram, aims to decouple the business logic from the persistence and the service layer. Clojure provides the concept of a protocol (https://clojure.org/reference/protocols) that can be used to define the interfaces, that act as ports of Hexagonal Architecture. These ports can then be implemented by the adapters, resulting in a decoupled implementation that can be swapped based on the requirement. Execution of these adapters can then be triggered via Pedestal interceptors based on the business logic.
