Thanks Val, that's much more similar to what I was looking for.
With respect to  when you say "get class to create instance during
deployment" do you mean during the server startup time ?
 If a change is in service, then there is no built in mechanism for now.
But you can create a wrapper that will know class name of particular service
implementation and get class to create instance during deployment. When
service implementation change, you can use rolling upgrade technique.
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