Blocking client side execution until server executes the service completely

hii to all....im loading data from the server using asynchronous
callback. so is there any way that i can stop executing client side
execution until i get data from the server. any way to block
asynchronous behavior so that i can wait for the data from the
server....
this is the example....im using like.. and i dont want JVM to execute
further till recordSet is not populated..thanx for looking into
it..hope u will help me out

Service.loadData(mProcedureName, request, new AsyncCallback<Data>() {

public void onFailure(Throwable ex) {

Logger.getLogger(DataServiceImpl.class.getName()).error("Load data
failed.", ex);
}

public void onSuccess(Data data) {
recordSet.setRecords(data);
}
});
}

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