Question

I have written several services that I am glueing together using Guice. For example some abstract service A is described by these interfaces

Response
Request
Service

And the implementation is defined as

ResponseImpl
RequestImpl
ServiceImpl

Would it be better to bind all of the above implementations to their interface in the service’s module, or just the Service class itself?

Answer 1

When you seperate contract (interface) and implementation (service-impl), you usually hand only the interfaces (api-jar) to the application-clients. So they will never see (and care about) any implementing beans.

Thus, in your client code, bind the interfaces:

@Provides
public Service lookup() {
   return .... whatever you need to do to access the Service
}