apollo-portal/src/main/java/com/ctrip/framework/apollo/openapi/server/service/ServerNamespaceOpenApiService.java/ServerNamespaceOpenApiService/getNamespaces
class ServerNamespaceOpenApiService:  @Override
  public List<OpenNamespaceDTO> getNamespaces(String appId, String env, String clusterName) {
    return OpenApiBeanUtils
        .batchTransformFromNamespaceBOs(namespaceService.findNamespaceBOs(appId, Env
            .valueOf(env), clusterName));
  }