code: public String findDnsServiceName(final String serviceName) {
          String dnsServiceName = serviceNameToDNSName.get(serviceName);
          dnsServiceName = (dnsServiceName == null ? serviceName : dnsServiceName) + postfixURL;
  
  
          if (debug) logger.debug("Find DNS_ServiceName dnsServiceName={} serviceName={}", dnsServiceName, serviceName);
          return dnsServiceName;
      }
docs: Looks up a dns service name (SRV DNS RECORD).
  
  @param serviceName serviceName
  @return DNS service name (server field + name of SRV DNS Record).