将Cassandra客户端Hector迁移到java驱动程序-替换ConnectionListener

目前，我们正在将Cassandra客户端从Hector迁移到Java驱动程序，但无法找到ConnectionListener的替代品，因为这是为了避免对同一个DC的重复客户端请求，该DC由于某种原因已经关闭

代码：

         if(getClusterConnectionListenerForDCId(dcId).isAllHostsInThisDCClusterDown())
             {
            /* directly return failure w/o even trying: this is vital, because if we keep trying to write to a all-downed cluster again and again,and since hector is stupid enough not to skip writing to cluster given that it already knew the cluster is all down, every single remote local-quorum call will need to wait until timeout (10 second) again and again, when cross-DC channel has hiccup.
*/
                            return false;
                }

        //overridden function of ConnectionManagerListener

        @Override
            public void onAllHostsDown() {
                //when all hosts are down for a particular cluster, we want to disable writing to that particular cluser
                //until at least one host of the cluster recovers
                mIsAllHostsInThisDCClusterDown = true;
                smIsAnyDCClusterAllHostsDown = true;
                logger.warn("all hosts are down for DC: " + mDcId);
            } 

但无法找到ConnectionListener的替代品，因为这是为了避免重复客户端对同一DC的请求，该DC由于某种原因已经关闭

你不再需要它了。有了Java驱动程序，您就有了

dcawarreloadbalancingstrategy

，它将自动为您处理节点/DC停机时间