flink-26 侧输出流

package com.learn.flink.process;

import com.learn.flink.bean.WaterSensor;
import com.learn.flink.functions.WaterSensorMapFunction;
import org.apache.flink.api.common.eventtime.WatermarkStrategy;
import org.apache.flink.api.common.typeinfo.Types;
import org.apache.flink.streaming.api.datastream.SingleOutputStreamOperator;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
import org.apache.flink.util.Collector;
import org.apache.flink.util.OutputTag;

import java.time.Duration;

public class SideOutputDemo {
    public static void main(String[] args) throws Exception {
        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
        env.setParallelism(1);

        SingleOutputStreamOperator<WaterSensor> sensorDS = env.socketTextStream("hadoop003", 7777)
                .map(new WaterSensorMapFunction())
                .assignTimestampsAndWatermarks(
                        WatermarkStrategy.<WaterSensor>forBoundedOutOfOrderness(Duration.ofSeconds(3))
                                .withTimestampAssigner((element, recordTimestamp) -> element.getTs())
                );
        OutputTag<String> warnTag = new OutputTag<>("warn", Types.STRING);
        SingleOutputStreamOperator<WaterSensor> process = sensorDS.keyBy(WaterSensor::getId)
                .process(new KeyedProcessFunction<String, WaterSensor, WaterSensor>() {
                    @Override
                    public void processElement(WaterSensor value, KeyedProcessFunction<String, WaterSensor, WaterSensor>.Context ctx, Collector<WaterSensor> out) throws Exception {
                        // 使用测输出流告警
                        if (value.getVc() > 10) {
                            ctx.output(warnTag, "当前水位=" + value.getVc() + ",大于阈值10！！！");
                        }
                        // 主流正常发送数据
                        out.collect(value);
                    }
                });

        process.getSideOutput(warnTag).print("告警: ");
        process.print("主流: ");

        env.execute();
    }
}