code: @Subscribe
      public synchronized void renew(final MasterSlaveRuleChangedEvent masterSlaveRuleChangedEvent) {
          if (getName().equals(masterSlaveRuleChangedEvent.getShardingSchemaName())) {
              masterSlaveRule = new OrchestrationMasterSlaveRule(masterSlaveRuleChangedEvent.getMasterSlaveRuleConfiguration());
          }
      }
docs: Renew master-slave rule.
  
  @param masterSlaveRuleChangedEvent master-slave rule changed event.