TTTEEEE

public static DataStream<Tuple3<String, Integer, Integer>> runWindowJoin(
        DataStream<Tuple2<String, Integer>> grades,
        DataStream<Tuple2<String, Integer>> salaries,
        long windowSize) {

    return grades.join(salaries)
            .where(new NameKeySelector())
            .equalTo(new NameKeySelector())
            .window(TumblingEventTimeWindows.of(Time.milliseconds(windowSize)))
            .apply(new JoinFunction<Tuple2<String, Integer>, Tuple2<String, Integer>, Tuple3<String, Integer, Integer>>() {
                @Override
                public Tuple3<String, Integer, Integer> join(
                        Tuple2<String, Integer> first,
                        Tuple2<String, Integer> second) {
                    return new Tuple3<String, Integer, Integer>(first.f0, first.f1, second.f1);
                }
            })
            ;
}