Instead of using the EventBus you could also use a Callback in your 
StateResolver. Seems to me that only the class that calls 
stateResolver.resolve() is interested in the result, so there isn't a real 
need for using an application wide event bus.

stateResolver.resolveState(...., new Callback() {
  void onSuccess() {
    //call method that handles the state
   }
});

Or you implement the Callback interface directly in your Activity (but then 
I would rename it to StateResolverPeer.stateResolved(T state) or something 
like that) and then simply call stateResolver.resolveState(...., this).

If there is a 1:1 relation I would not use event bus in most cases.

-- J.

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