@Override
        public void stateChange(StateChangeEvent stateChangeEvent) throws RuntimeException {
            if (repConfig != null) {
                logger.warn(new StringBuilder(TBaseConstants.BUILDER_DEFAULT_SIZE)
                        .append("[BDB Impl][").append(repConfig.getGroupName())
                        .append("Receive a group status changed event]... stateChangeEventTime: ")
                        .append(stateChangeEvent.getEventTime()).toString());
            }
            doWork(stateChangeEvent);
        }
State Change Listener,
through this object, it complete the metadata cache cleaning
and loading of the latest data.
inlong-tubemq/tubemq-server/src/main/java/org/apache/inlong/tubemq/server/master/metamanage/metastore/impl/bdbimpl/BdbMetaConfigMapperImpl.java