public boolean ready() {
        return (updates != 0);
    }
Ask if the MirrorAPI has got any useful information from the Slobrok.

On application startup it is often useful to run the event loop for some time until this functions returns true
(or if it never does, time out and tell the user there was no answer from any Service Location Broker).

@return true if the MirrorAPI object has asked for updates from a Slobrok and got any answer back
jrt/src/com/yahoo/jrt/slobrok/api/Mirror.java