@Override
    public void close() {
        if (Objects.nonNull(etcdClient)) {
            etcdClient.close();
        }
    }
Instantiates a new Zookeeper cache manager.

@param shenyuConfig          shenyuConfig
@param etcdClient           etcdClient
@param pluginDataSubscriber the plugin data subscriber
@param metaDataSubscribers  the meta data subscribers
@param authDataSubscribers  the auth data subscribers
shenyu-sync-data-center/shenyu-sync-data-etcd/src/main/java/org/apache/shenyu/sync/data/etcd/EtcdSyncDataService.java