package com.atguigu.bigdata;

import org.apache.flink.api.common.functions.FlatMapFunction;
import org.apache.flink.api.common.functions.MapFunction;
import org.apache.flink.api.java.functions.KeySelector;
import org.apache.flink.api.java.tuple.Tuple2;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.util.Collector;

/**
 * @Author lzc
 * @Date 2022/3/24 15:28
 */
public class UnboundedWC {
    public static void main(String[] args) throws Exception {
        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
        env.setParallelism(1);
        
        env
            .socketTextStream("hadoop102", 9999)
            .flatMap(new FlatMapFunction<String, String>() {
                @Override
                public void flatMap(String line,
                                    Collector<String> out) throws Exception {
                    for (String word : line.split(" ")) {
                        out.collect(word);
                    }
                }
            })
            .map(new MapFunction<String, Tuple2<String, Long>>() {
                @Override
                public Tuple2<String, Long> map(String word) throws Exception {
                    return Tuple2.of(word, 1l);
                }
            })
            .keyBy(new KeySelector<Tuple2<String, Long>, String>() {
                @Override
                public String getKey(Tuple2<String, Long> t) throws Exception {
                    return t.f0;  // t._1
                }
            })
            .sum(1)
            .print();
        
        env.execute();
        
    }
}