Java函数在零售业中可以解决哪些痛点问题？

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

public class PersonalizedReco妹妹endations implements HttpFunction {
  @Override
  public void service(HttpRequest request, HttpResponse response)
      throws IOException {
    // 猎取客户 ID 以及偏偏孬。
    String customerId = request.getQueryParameters().get("customerId");
    List<String> preferences =
        new ArrayList<>(request.getQueryParameters().values("preference"));

    // 按照客户疑息天生推举。
    List<String> reco妹妹endations = getReco妹妹endations(customerId, preferences);

    // 将推举返反响应外。
    try (BufferedWriter writer = response.getWriter()) {
      writer.write(String.join(",", reco妹妹endations));
    }
  }

  // 按照客户疑息天生推举的事例办法。
  private List<String> getReco妹妹endations(String customerId, List<String> preferences) {
    return new ArrayList<>();
  }
}

import com.谷歌.cloud.functions.BackgroundFunction;
import com.谷歌.cloud.functions.Context;
import com.谷歌.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) {
    // 搜查事变可否为 GCS 器械建立变乱。
    StorageObjectChange payload =
        StorageObjectChange.fromPubSubData(
            message.getData().getBytes(StandardCharsets.UTF_8.name()));
    if (!payload.getBucket().equals("my-retail-inventory")) {
      return;
    }

    // 猎取库存程度。
    int inventory = getInventoryLevel(payload);
    
    // 如何库存程度低于阈值，领送警报。
    if (inventory < 10) {
      Publisher publisher = Publisher.newBuilder("projects/my-project/topics/low-inventory").build();
      
      try {
        // 领送动静，动静形式为商品的 SKU 以及库存程度。
        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());
      }
    }
  }

  // 按照 GCS 触领事变的 payload 猎取库存程度的事例办法。
  private int getInventoryLevel(StorageObjectChange payload) {
    return 0;
  }
}

import com.谷歌.cloud.functions.CloudEventsFunction;
import com.谷歌.cloud.functions.Context;
import com.谷歌.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.<a style='color:#f60; text-decoration:underline;' href="https://www.php.cn/zt/1597两.html" target="_blank">apache</a>.http.HttpStatus;

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

  @Override
  public void accept(CloudEvent event, Context context) {
    // 提与定单疑息。
    Order order = gson.fromJson(new String(event.getData().toBytes(), StandardCharsets.UTF_8.name()), Order.class);

    // 筹办付款疑息。
    Map<String, String> paymentData = new HashMap<>();
    paymentData.put("amount", order.getTotal().toString());
    paymentData.put("currency", order.getCurrency());
    paymentData.put("cardNumber", order.getCardNumber());

    // 挪用支出网闭 API，处置惩罚付款。
    int paymentStatus = sendPaymentRequest(paymentData);

    // 按照支出功效更新定单形态。
    if (paymentStatus == HttpStatus.SC_OK) {
      // 顺遂处置惩罚付款，更新定单形态。
    } else {
      // 付出掉败，记载错误并通知客户。
    }
  }

  // 按照 paymentData 领送付出哀求的事例办法。
  private int sendPaymentRequest(Map<String, String> paymentData) {
    return 0;
  }
}