<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def run(self):
 """generator driven data flow """

        # 如果出现了日期的改变 才会进行结算的事件
        _date = None

        while QA_util_if_tradetime(self.now):
            for data in self.ingest_data:  # 对于在ingest_data中的数据
                # <class 'QUANTAXIS.QAData.QADataStruct.QA_DataStruct_Stock_day'>
                date = data.date[0]
                if self.market_type is MARKET_TYPE.STOCK_CN:  # 如果是股票市场
                    if _date != date:  # 如果新的date
                        # 前一天的交易日已经过去
                        # 往 broker 和 account 发送 settle 事件
                        try:
                            self.market.trade_engine.join()
                            # time.sleep(2)
                            self.market._settle(self.broker_name)

                        except Exception as e:
                            raise e
                # 基金 指数 期货
                elif self.market_type in [MARKET_TYPE.FUND_CN, MARKET_TYPE.INDEX_CN, MARKET_TYPE.FUTURE_CN]:
                    self.market._settle(self.broker_name)
                # print(data)
                self.broker.run(
                    QA_Event(event_type=ENGINE_EVENT.UPCOMING_DATA, market_data=data))
                # 生成 UPCOMING_DATA 事件放到 队列中去执行

                self.market.upcoming_data(self.broker_name, data)

                self.market.trade_engine.join()

                _date = date