I have to disagree, by returning a value and switching on it, not only are you querying state but you risk repeating the query code all over the place.
My approach allows you to write a small adapter for your delivery mechanism and use polymorphism to eliminate conditions and duplication.
Most objects cannot be used on their own as they have collaborators. My design allows me to write a trivial console adapter that can puts the results of my service object / interactor.
I have to disagree, by returning a value and switching on it, not only are you querying state but you risk repeating the query code all over the place.
My approach allows you to write a small adapter for your delivery mechanism and use polymorphism to eliminate conditions and duplication.
Most objects cannot be used on their own as they have collaborators. My design allows me to write a trivial console adapter that can puts the results of my service object / interactor.