We have seen already how to define a service. The next natural step is to implement the service interface, and this is materialized in the
hello-impl project. The
HelloServiceImpl class is responsible for implementing your API interface. We have seen this throughout the code snippets listed earlier. One important thing to notice is that all the methods don't actually execute the call, but rather return a method handle via the instance of
ServiceCall. The reason behind this approach is to allows function composition in order to achieve a processing pipeline where authentication, authorization, logging, and exception handling can easily be added.
Let's move the focus back to
ServiceCall class. From the definition presented ...