code: @Override
  	public boolean update() {
          for (CallbackListener callbackListener : this.callbackListeners) {
              callbackListener.beforeUpdate(this);
          }
  		boolean ret = super.update();
  		if (this.syncToRedis && ret) {
  			this.saveToRedis();
  		}
          for (CallbackListener callbackListener : this.callbackListeners) {
              callbackListener.afterUpdate(this);
          }
  		return ret;
  	}
docs: update db, if `syncToRedis` is true , this model will update redis in the same time.