apollo-configservice/src/main/java/com/ctrip/framework/apollo/metaservice/service/NacosDiscoveryService.java/NacosDiscoveryService/setNamingService
class NacosDiscoveryService:    @NacosInjected
    public void setNamingService(NamingService namingService) {
        this.namingService = namingService;
    }