title: How to wait until GWT RPC completes?
body: <p>I am using GWT and i am making RPC calls to get some data from database. I use this data to draw charts with Google Charts API.
   The problem is that GWT RPC call is async and my chart is always using data from the last call, not the current one.(i populate int array in onSuccess function)).
  How should i wait some time to make sure that RPC completes and writes my array and then draw my chart, since there is no Thread.sleep() function?</p>