Flink1.18 Transfrom - Filter

package com.xiaohu.transfrom;

import com.xiaohu.bean.WaterSensor;
import org.apache.flink.api.common.functions.FilterFunction;
import org.apache.flink.streaming.api.datastream.DataStreamSource;
import org.apache.flink.streaming.api.datastream.SingleOutputStreamOperator;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;

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

        env.setParallelism(1);


        DataStreamSource<WaterSensor> source = env.fromElements(
                new WaterSensor("s1", 1L, 1),
                new WaterSensor("s2", 2L, 2),
                new WaterSensor("s3", 3L, 3),
                new WaterSensor("s1", 4L, 4),
                new WaterSensor("s5", 5L, 5),
                new WaterSensor("s6", 6L, 6)
        );

        //过滤出id为s1的留下
        SingleOutputStreamOperator<WaterSensor> res1 = source.filter(new FilterFunction<WaterSensor>() {
            @Override
            public boolean filter(WaterSensor value) throws Exception {
                return "s1".equals(value.getId());
            }
        });

        res1.print();


        env.execute();
    }
}