rpc call

as gwt has no java pattern class and so I want to use server validation, at first, my code is
if (!validate()_{

}else{
  retrieveData();
}

the validate() method is only client side validation first, but now I need add rpc server validation test, so I think if the server validation rpc call is non-blocking, then maybe
there is server validation error, but the client side code already run to the else part and run retrieveDate(), any method to ensure the validate() method is completed before retrieveData() is called?

--
You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group.
To view this discussion on the web visit https://groups.google.com/d/msg/google-web-toolkit/-/pONxZAoV2PEJ.
To post to this group, send email to google-web-toolkit@googlegroups.com.
To unsubscribe from this group, send email to google-web-toolkit+unsubscribe@googlegroups.com.
For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.