Map containing Retrofit API interface method from ServiceHelper

Question

I am trying to follow the REST client implementation pattern described in the Google I/O Dobjanschi video here and am using Retrofit2 for the REST API calls.

Based on the REST client pattern described above I introduced a ServiceHelper layer that calls the actual API method via Retrofit. However I don't have a clean way to call the interface methods from the ServiceHelper layer.

I currently have an enum of the available API calls and pass that from the ServiceHelper. And in my ApiProcessor introduced a function that uses an giant if..else if ladder that returns the appropriate Retrofit API interface call based on the enum passed in. I haven't really found a better/cleaner approach to this.

Is there a better / cleaner way to map these? Or any other ideas to do this?

Answer 1

You should throw away that monolithic ServiceHelper and create several repositories following the repository pattern in order to encapsulate and distribute responsibilities between classes.

Actually, the Retrofit API itself favors composition over inheritance, so you can easily create as much interfaces as needed and use them in the right repository.