实时计算 促销活动

import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.streaming.api.datastream.DataStream;
import org.apache.flink.api.common.functions.MapFunction;

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

        DataStream<String> clicks = env.addSource(new ClickSource()); // 假设ClickSource是自定义的数据源

        DataStream<PromotionClick> parsedClicks = clicks.map(new MapFunction<String, PromotionClick>() {
            @Override
            public PromotionClick map(String value) throws Exception {
                // 解析点击数据并转换为PromotionClick对象
                return new PromotionClick(value);
            }
        });

        DataStream<Double> clickRates = parsedClicks
            .keyBy("promotionId")
            .timeWindow(Time.minutes(5))
            .aggregate(new ClickRateAggregator());

        clickRates.print();

        env.execute("Promotion Click Rate Calculation");
    }
}