How to "embrace" asynchrony in GWT apps?

I read it and heard it from GWT gurus that because of the nature of AJAX apps, we should embrace the asynchronous nature of the calls. I understand the concept but I am not 100% sure about how to design the following requirement:

My View displays some data that is produced using the combination of some data from an RPC call and some data from local (it's a mobile app, so it gets some data from local file or db). The Presenter is supposed to get all the required data and refresh the view.

Now, I want to wrap all these individual calls (one call to RPC and one call to fetch local data), into a single call in a Facade. So ideally, in my Presenter, i want to call :

facade.getAllData( new MyCallBackHander(){
     void onFailure(){ }
     void onSuccess(){
       update the model and call refresh on the view
     }
 }  );

I am not sure if this is the right approach. I would like to use this pattern for all the calls made by various Presenters and I am not sure how to make it generic and how to code the getAllData method in the facade.

Please help.
thank you!

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