Should Use Cases or Application Services have interfaces and implementations when following a hexagonal architecture with ddd principles? For example, the use case "delete a video", should it have IDeleteVideo (interface) and DeleteVideoImpl (implementation) implementing that interface?
If the answer is yes, where should the interfaces of the use cases be, in the domain layer or in the application layer? It is obvious that the implementation should always be at the application layer.
I think the use cases is not something that varies frequently, so in my opinion I think that it is not necessary to have an interface, with the implementation it would be enough. But in terms of hexagonal architecture and DDD principles, is something stated regarding this?
Thanks in advance.
