code: public static String makeServicePath(String serviceName) {
          checkNotNull(serviceName);
          checkArgument(!"".equals(serviceName));
          return ZKPaths.makePath(ROOT_SERVICES_PATH, serviceName);
      }
docs: Construct the path in ZooKeeper to where a service's children live.
  @param serviceName The name of the service to get the ZooKeeper path for.
  @return The ZooKeeper path.