public Parser acceptMessageCount() {
        if (acceptMessageCountParser == null) {
           FutureParser future = scoped("acceptMessageCount");
           acceptMessageCountParser = future;
           future.setParser(
               sequence(
                   identifier(),
                   optional(
                       token("MESSAGE")
                   ),
                   token("COUNT")
               )
           );
        }

        return acceptMessageCountParser;
    }