apollo-portal/src/main/java/com/ctrip/framework/apollo/portal/service/AppNamespaceService.java/AppNamespaceService/findByAppIdAndName
class AppNamespaceService:  public AppNamespace findByAppIdAndName(String appId, String namespaceName) {
    return appNamespaceRepository.findByAppIdAndName(appId, namespaceName);
  }