code: public void registerCommands(Iterable<Class<? extends RESTCallback>> cmdClasses,
                                   StorageService service) {
          m_cmdRegistry.registerCallbacks(service, cmdClasses);
      }
docs: Register a set of application REST commands as belonging to the given storage
  service owner. The commands are defined via a set of {@link RESTCallback} objects,
  which must use the {@link Description} annotation to provide metadata about the
  commands.
  
  @param callbackClasses   Iterable collection of {@link RESTCallback} classes
  that define application-specific REST commands to be
  registered.
  @param service           {@link StorageService} that owns the commands.