public Optional<String> getSystemFactory(String systemName) {
    if (systemName == null) {
      return Optional.empty();
    }
    String systemFactory = String.format(SYSTEM_FACTORY_FORMAT, systemName);
    String value = get(systemFactory, null);
    return (StringUtils.isBlank(value)) ? Optional.empty() : Optional.of(value);
  }
Config helper methods related to systems.
samza-core/src/main/java/org/apache/samza/config/SystemConfig.java