自定义实现 WatermarkStrategy接口

代码：

    public static class WatermarkDemoFunction implements WatermarkStrategy<JSONObject>{private Tuple2<Long,Boolean> state = Tuple2.of(0L,true);@Overridepublic WatermarkGenerator<JSONObject> createWatermarkGenerator(WatermarkGeneratorSupplier.Context context) {return new WatermarkGenerator<JSONObject>() {private long maxWatermark;@Overridepublic void onEvent(JSONObject waterSensor, long l, WatermarkOutput watermarkOutput) {maxWatermark = Math.max(maxWatermark,waterSensor.getLong("ts"));state.f0 = System.currentTimeMillis();System.out.println("maxWatermark is " + maxWatermark);state.f1 = false;}@Overridepublic void onPeriodicEmit(WatermarkOutput watermarkOutput) {//乱序时间long outOfTime = 3000L;if (maxWatermark - outOfTime <=0){} else {// 10s内没有数据则关闭当前窗口System.out.println("System.currentTimeMillis() - state.f0:" + (System.currentTimeMillis() - state.f0));System.out.println("state.f1:" + state.f1);if (System.currentTimeMillis() - state.f0 >= 9000L && !state.f1){watermarkOutput.emitWatermark(new Watermark(maxWatermark  + 6000L));state.f1 = true;System.out.println("触发窗口,maxWatermark  + 6000L:" + (maxWatermark  + 6000L));} else {System.out.println("正常发送水印");watermarkOutput.emitWatermark(new Watermark(maxWatermark - outOfTime));}}}};}}

代码部分逻辑说明
若设置了自动生成watermark 参数，根据打印日志，设置对应的时间（多久没新数据写入，触发窗口计算）
env.getConfig().setAutoWatermarkInterval(5000);

使用自定义的watermark：

参考：https://blog.csdn.net/lr131425/article/details/127422833