Java函数在零售业中可以解决哪些痛点问题？

import com.google.cloud.functions.HttpFunction;
import com.google.cloud.functions.HttpRequest;
import com.google.cloud.functions.HttpResponse;
import java.io.BufferedWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

public class PersonalizedRecommendations implements HttpFunction {
  @Override
  public void service(HttpRequest request, HttpResponse response)
      throws IOException {
    // 获取客户 ID 和偏好。
    String customerId = request.getQueryParameters().get("customerId");
    List<String> preferences =
        new ArrayList<>(request.getQueryParameters().values("preference"));

    // 根据客户信息生成推荐。
    List<String> recommendations = getRecommendations(customerId, preferences);

    // 将推荐返回响应中。
    try (BufferedWriter writer = response.getWriter()) {
      writer.write(String.join(",", recommendations));
    }
  }

  // 根据客户信息生成推荐的示例方法。
  private List<String> getRecommendations(String customerId, List<String> preferences) {
    return new ArrayList<>();
  }
}

import com.google.cloud.functions.BackgroundFunction;
import com.google.cloud.functions.Context;
import com.google.cloud.pubsub.v1.Publisher;
import functions.eventpojos.PubSubMessage;
import functions.eventpojos.StorageObjectChange;
import java.nio.charset.StandardCharsets;
import java.util.logging.Logger;

public class InventoryAlert implements BackgroundFunction<PubSubMessage> {
  private static final Logger logger = Logger.getLogger(InventoryAlert.class.getName());

  @Override
  public void accept(PubSubMessage message, Context context) {
    // 检查事件是否为 GCS 对象创建事件。
    StorageObjectChange payload =
        StorageObjectChange.fromPubSubData(
            message.getData().getBytes(StandardCharsets.UTF_8.name()));
    if (!payload.getBucket().equals("my-retail-inventory")) {
      return;
    }

    // 获取库存水平。
    int inventory = getInventoryLevel(payload);
    
    // 如果库存水平低于阈值，发送警报。
    if (inventory < 10) {
      Publisher publisher = Publisher.newBuilder("projects/my-project/topics/low-inventory").build();
      
      try {
        // 发送消息，消息内容为商品的 SKU 和库存水平。
        String inventoryJson = String.format("{\"sku\": \"%s\", \"inventory\": \"%d\"}",
            payload.getName(), inventory);
        publisher.publish(inventoryJson.getBytes(StandardCharsets.UTF_8.name()));
      } catch (Exception e) {
        logger.severe("Failed to send inventory alert message: " + e.getMessage());
      }
    }
  }

  // 根据 GCS 触发事件的 payload 获取库存水平的示例方法。
  private int getInventoryLevel(StorageObjectChange payload) {
    return 0;
  }
}

import com.google.cloud.functions.CloudEventsFunction;
import com.google.cloud.functions.Context;
import com.google.gson.Gson;
import functions.eventpojos.CloudEvent;
import functions.eventpojos.Order;
import java.nio.charset.StandardCharsets;
import java.util.HashMap;
import java.util.Map;
import org.apache.http.HttpStatus;

public class OrderProcessing implements CloudEventsFunction {
  private static final Gson gson = new Gson();

  @Override
  public void accept(CloudEvent event, Context context) {
    // 提取订单信息。
    Order order = gson.fromJson(new String(event.getData().toBytes(), StandardCharsets.UTF_8.name()), Order.class);

    // 准备付款信息。
    Map<String, String> paymentData = new HashMap<>();
    paymentData.put("amount", order.getTotal().toString());
    paymentData.put("currency", order.getCurrency());
    paymentData.put("cardNumber", order.getCardNumber());

    // 调用支付网关 API，处理付款。
    int paymentStatus = sendPaymentRequest(paymentData);

    // 根据支付结果更新订单状态。
    if (paymentStatus == HttpStatus.SC_OK) {
      // 成功处理付款，更新订单状态。
    } else {
      // 支付失败，记录错误并通知客户。
    }
  }

  // 根据 paymentData 发送支付请求的示例方法。
  private int sendPaymentRequest(Map<String, String> paymentData) {
    return 0;
  }
}