How to delay an anchor action to wait for a AsyncCallback?

Hi,

I have an Anchor that onClick performs an RPC call to a servlet. Based on the outcome I want to set the hRef of the Anchor, and then perform the open url action of the Anchor.

BUT: how can I tell the anchor to wait for the Callback to finish before trying to open the url?

@UiField
Anchor anchor;

@UiHandler("anchor")
void onClick(ClickEvent evt) {
          MyService.performRPC(jsonDTO, new MessageCallBack());
          //delay here until callback finised and has set the hRef of anchor
}

class MessageCallBack implements AsyncCallback<String> {

           @Override
           public void onSuccess(String result) {
                // do some computations based on the result and create the url thereby
                String url =...    
                anchor.setHref(url);                
           }
}

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