@Override
        public void innerReceive(String dataId, String group, String configInfo) {
            String oldValue = cacheData.get(dataId);
            ConfigChangedEvent event =
                    new ConfigChangedEvent(dataId, configInfo, getChangeType(configInfo, oldValue));
            if (configInfo == null) {
                cacheData.remove(dataId);
            } else {
                cacheData.put(dataId, configInfo);
            }
            listeners.forEach(listener -> listener.process(event));
        }
receive config change event

@param dataId     data ID
@param group      group
@param configInfo content
config/config-nacos/src/main/java/com/alipay/sofa/rpc/dynamic/nacos/NacosDynamicConfigManager.java