利用 Java 函数在金融科技中创建智能且自动的应用程序？

import java.util.Map;
import java.util.Optional;
import java.util.logging.Logger;

import com.google.cloud.functions.Context;
import com.google.cloud.functions.RawBackgroundFunction;

public class CalculateRoi implements RawBackgroundFunction {
  private Logger logger = Logger.getLogger(CalculateRoi.class.getName());

  @Override
  public void accept(String json, Context context) {
    logger.info("Calculating ROI for " + json);

    // 解析 JSON 输入
    Map<String, String> input = context.rawEventData().getData();

    // 获取投资和当前价格
    String investment = input.get("investment");
    String currentPrice = input.get("currentPrice");

    // 计算 ROI
    double roi = 0.0;
    if (Double.parseDouble(investment) > 0.0) {
      roi = (Double.parseDouble(currentPrice) - Double.parseDouble(investment)) / Double.parseDouble(investment);
    }

    logger.info("ROI is " + roi);
  }
}

gcloud pubsub topics publish roi-events \
--message '{"investment": "100.0", "currentPrice": "120.0"}'