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