apollo-biz/src/main/java/com/ctrip/framework/apollo/biz/service/NamespaceService.java/NamespaceService/findByAppIdAndNamespaceName
class NamespaceService:  public List<Namespace> findByAppIdAndNamespaceName(String appId, String namespaceName) {
    return namespaceRepository.findByAppIdAndNamespaceNameOrderByIdAsc(appId, namespaceName);
  }