package com.hao.chapter08;

import org.apache.flink.api.common.eventtime.SerializableTimestampAssigner;
import org.apache.flink.api.common.eventtime.WatermarkStrategy;
import org.apache.flink.api.common.functions.JoinFunction;
import org.apache.flink.api.java.tuple.Tuple2;
import org.apache.flink.streaming.api.datastream.DataStream;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.streaming.api.windowing.assigners.TumblingEventTimeWindows;
import org.apache.flink.streaming.api.windowing.time.Time;

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

        //定义两条流
        DataStream<Tuple2<String, Long>> stream1 = env.fromElements(
                        Tuple2.of("a", 1000L),
                        Tuple2.of("b", 1000L),
                        Tuple2.of("a", 2000L),
                        Tuple2.of("b", 2000L)
                )
                .assignTimestampsAndWatermarks(WatermarkStrategy.<Tuple2<String, Long>>forMonotonousTimestamps()
                        .withTimestampAssigner(new SerializableTimestampAssigner<Tuple2<String, Long>>() {
                                                   @Override
                                                   public long extractTimestamp(Tuple2<String, Long> stringLongTuple2, long l) {
                                                       return stringLongTuple2.f1;
                                                   }
                                               }
                        )
                );
        DataStream<Tuple2<String, Long>> stream2 = env.fromElements(
                        Tuple2.of("a", 3000L),
                        Tuple2.of("b", 3000L),
                        Tuple2.of("a", 4000L),
                        Tuple2.of("b", 4000L)
                )
                .assignTimestampsAndWatermarks(WatermarkStrategy.<Tuple2<String, Long>>forMonotonousTimestamps()
                        .withTimestampAssigner(new SerializableTimestampAssigner<Tuple2<String, Long>>() {
                                                   @Override
                                                   public long extractTimestamp(Tuple2<String, Long> stringLongTuple2, long l) {
                                                       return stringLongTuple2.f1;
                                                   }
                                               }
                        )
                );
        stream1
                .join(stream2)
                .where(data -> data.f0)
                .equalTo(data -> data.f0)
                .window(TumblingEventTimeWindows.of(Time.seconds(5)))
                .apply(new JoinFunction<Tuple2<String, Long>, Tuple2<String, Long>, String>() {
                    @Override
                    public String join(Tuple2<String, Long> left, Tuple2<String, Long> right) throws Exception {
                        return left + "=>" + right;
                    }
                })
                .print();
        env.execute();
    }
}