I dont know the app itself and its data types but to me it seems like that RequestXyzData events will quickly become a burden (Event + Handler and its more difficult to navigate through code). These events are probably too specific, tied to a given screen/presenter and probably only a single class will listen for a single event type in ordner to fetch the correct data requested by that event.
In that case you may end up having a 1..1 relationship between the data provider and its consumer/presenter and it would have been easier to just create a class that can fetch that data and make that class a dependency for a given presenter.
So I would try to go the facade way and give them good names, e.g. ScoreBoardDataProvider.getRankings(Callback<Rankings>). Maybe you just try both approaches and see what fits best for your app.
-- J.
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