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?
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