我的任务是从本地驱动器读取csv文件。它包含定期更新的股票数据。接下来，对读取的数据执行一些操作，并定期写回新的csv文件。
我的代码是从维基百科分析代码中改编的，问题是执行只发生一次。初始运行后，程序结束，不再保持运行状态。它不像wikipediaanalysis那样以5秒的固定间隔运行（我已经设置了）。下面是我的代码：

StreamExecutionEnvironment see = StreamExecutionEnvironment.getExecutionEnvironment();
DataStream<String> dataStream = getCsvDataStream(see);
DataStream<Stock> edits = dataStream.flatMap(new Tokenizer());
@SuppressWarnings("serial")
KeyedStream<Stock, String> keyedEdits = edits.keyBy(new KeySelector<Stock, String>() {
            @Override
            public String getKey(Stock event) {
                java.util.Date time = new java.util.Date((long) event.getTimeStamp() * 1000);
                return time.toString();
            }
        });

@SuppressWarnings("serial")
DataStream<Tuple2<Double, Double>> result = keyedEdits.timeWindow(Time.seconds(5))
                .fold(new Tuple2<>(0.0d, 0.0d), new FoldFunction<Stock, Tuple2<Double, Double>>() {
                    @Override
                    public Tuple2<Double, Double> fold(Tuple2<Double, Double> acc, Stock event) {
                        acc.f0 = event.getClose();
                        acc.f1 = event.getOpen();                           
                        return acc;
                    }
                });

你能给我个建议吗！！