@Override
        public ConfigData peekData() {
            String data = CommonUtils.join(providerInfos, "#");

            final DefaultConfigData defaultConfigData = new DefaultConfigData(data);
            return defaultConfigData;
        }
build config data
@param num
@return
registry/registry-sofa/src/test/java/com/alipay/sofa/rpc/registry/sofa/SofaRegistrySubscribeCallbackTest.java