Oceanus 双十一活动

import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.streaming.api.windowing.time.Time;
import org.apache.flink.api.common.functions.FlatMapFunction;
import org.apache.flink.api.java.tuple.Tuple2;
import org.apache.flink.util.Collector;

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

        env.socketTextStream("localhost", 9999)
            .flatMap(new FlatMapFunction<String, Tuple2<String, Integer>>() {
                @Override
                public void flatMap(String value, Collector<Tuple2<String, Integer>> out) {
                    out.collect(new Tuple2<>(value, 1));
                }
            })
            .keyBy(0)
            .timeWindow(Time.seconds(5))
            .sum(1)
            .print();

        env.execute("User Visit Count");
    }
}