实时计算 年末优惠活动

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 RealTimeDiscount {
    public static void main(String[] args) throws Exception {
        // 创建流处理环境
        final StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();

        // 假设我们有一个交易数据流
        DataStream<Transaction> transactions = env.addSource(new TransactionSource());

        // 实时计算折扣
        DataStream<DiscountedTransaction> discountedTransactions = transactions.map(new MapFunction<Transaction, DiscountedTransaction>() {
            @Override
            public DiscountedTransaction map(Transaction transaction) {
                // 根据交易信息计算折扣
                double discount = calculateDiscount(transaction);
                return new DiscountedTransaction(transaction, discount);
            }
        });

        // 输出处理后的交易数据
        discountedTransactions.print();

        // 执行流处理作业
        env.execute("Real-time Discount Calculation");
    }

    private static double calculateDiscount(Transaction transaction) {
        // 这里可以添加具体的折扣计算逻辑
        return 0.1; // 示例中简单返回10%的折扣
    }
}

// 假设的交易类
class Transaction {
    // 交易属性...
}

// 折扣后的交易类
class DiscountedTransaction {
    // 折扣后交易的属性...
}