function appStore() {
  return {
    // 状态变量
    appName: 'ChatGPT',
    areaCode: 'us',
    appList: [],
    results: [],
    colorMode: localStorage.getItem('colorMode') || 'system',

    // 当前选中的应用（基于地区）
    get currentApp() {
      if (!this.results || this.results.length === 0) return {};
      return this.results.find(r => r.area.toLowerCase() === this.areaCode.toLowerCase())
        || this.results[0] || {};
    },

    // 初始化
    init() {
      this.getAreaList();
      this.getPopularSearchWords();
      this.applyColorMode();
    },

    // 搜索应用列表
    async searchAppList() {
      if (!this.appName.trim()) { this.errorAppList = '请输入应用名称'; return; }
      if (this.appName.trim().length > 20) {
        this.errorAppList = '应用名称长度不能超过20个字符';
        return;
      }
      this.loadingAppList = true;
      try {
        const response = await axios.post('/app/getAppList', {
          appName: this.appName.trim(),
          areaCode: this.areaCode
        });
        if (response.data.code === 0) {
          this.appList = response.data.data || [];
        }
      } catch (err) {
        this.errorAppList = '网络请求失败，请稍后重试';
      } finally {
        this.loadingAppList = false;
      }
    },
    // ...
  };
}

@RestController
@RequestMapping("app")
@RequiredArgsConstructor
public class AppController {

    private final AppService appService;

    @PostMapping("getAreaList")
    public List<AreaResDTO> getAreaList() {
        return appService.getAreaList();
    }

    @PostMapping("getPopularSearchWordList")
    public List<String> getPopularSearchWordList() {
        return appService.getPopularSearchWordList();
    }

    @PostMapping("getAppList")
    public List<GetAppListResDTO> getAppList(@RequestBody @Validated GetAppListReqDTO reqDTO) {
        return appService.getAppList(reqDTO);
    }

    @PostMapping("getAppInfo")
    public List<GetAppInfoResDTO> getAppInfo(@RequestBody @Validated GetAppInfoReqDTO reqDTO) {
        return appService.getAppInfo(reqDTO.getAppId());
    }
}

public List<GetAppListResDTO> getAppList(GetAppListReqDTO reqDTO) {
    // 1. 记录搜索次数（用于热门搜索）
    POPULAR_SEARCH_WORD.add(reqDTO.getAppName());

    // 2. 缓存 key：{areaCode}-{appName}
    String cacheKey = StrUtil.format("{}-{}", reqDTO.getAreaCode(), reqDTO.getAppName());
    List<GetAppListResDTO> appListCache = APP_LIST_CACHE.get(cacheKey);
    if (CollUtil.isNotEmpty(appListCache)) {
        return appListCache;
    }

    // 3. 细粒度锁：按 (areaCode, appName) 分段
    Object lock = LOCK_POOL.computeIfAbsent(
        StrUtil.format("getAppList-{}-{}", reqDTO.getAreaCode(), reqDTO.getAppName()),
        k -> new Object()
    );

    synchronized (lock) {
        // 4. 锁内双重检查
        appListCache = APP_LIST_CACHE.get(cacheKey);
        if (CollUtil.isNotEmpty(appListCache)) {
            return appListCache;
        }

        // 5. 并行抓 4 个平台（iphone/ipad/mac/tv）
        List<GetAppListResDTO> resultList = new CopyOnWriteArrayList<>();
        CollUtil.newArrayList("iphone", "ipad", "mac", "tv").parallelStream().forEach(entity -> {
            String searchUrl = StrUtil.format(
                "https://apps.apple.com/{}/{}/search?term={}",
                reqDTO.getAreaCode(), entity, StrUtil.trim(reqDTO.getAppName())
            );
            HttpResponse response = HttpUtil.createGet(searchUrl).execute();
            // 6. 解析 HTML
            Document doc = Jsoup.parse(response.body());
            Element scriptElement = doc.selectFirst("#serialized-server-data");
            // 7. Fastjson2 解析 + 提取 items
            // ...
        });
        // ...
    }
}

public List<GetAppInfoResDTO> getAppInfo(String appId) {
    // ... 缓存检查 + 细粒度锁
    Arrays.stream(AreaEnum.values()).parallel().forEach(areaEnum -> {
        String appStoreUrl = StrUtil.format(
            "https://apps.apple.com/{}/app/id{}",
            areaEnum.getCode(), appId
        );
        HttpResponse response = HttpUtil.createGet(appStoreUrl, true).execute();
        if (!response.isOk()) {
            log.error("appId: {}, app not found in {} app store", appId, areaEnum.getCode());
            return;
        }
        Document doc = Jsoup.parse(response.body());
        GetAppInfoResDTO resDTO = new GetAppInfoResDTO();
        resDTO.setAppId(appId);
        resDTO.setArea(areaEnum.getCode());
        resDTO.setAreaName(areaEnum.getName());
        Element scriptElement = doc.selectFirst("#serialized-server-data");
        if (Objects.isNull(scriptElement)) {
            log.error("appId: {}, area: {}, script element not found", appId, areaEnum.getCode());
            return;
        }
        JSONObject jsonResult = JSON.parseObject(scriptElement.html().trim())
            .getJSONArray("data").getJSONObject(0).getJSONObject("data");
        resDTO.setName(jsonResult.getString("title"));
        resDTO.setSubtitle(jsonResult.getJSONObject("lockup").getString("subtitle"));
        resDTO.setDeveloper(jsonResult.getJSONObject("developerAction").getString("title"));
        resDTO.setAppStoreUrl(appStoreUrl);
        resDTO.setPrice(parsePrice(
            jsonResult.getJSONObject("lockup").getJSONObject("offerDisplayProperties")
                .getString("priceFormatted"),
            areaEnum
        ));
        // ... 内购解析
    });
}

@Getter
@AllArgsConstructor
public enum AreaEnum {

    USA("us", "美国", "$", "USD", StrUtil.COMMA, "In-App Purchases", "en-US"),

    CHINA("cn", "中国", "¥", "CNY", StrUtil.COMMA, "App内购买", "zh-CN"),

    TAIWAN("tw", "台湾", "NT$", "TWD", StrUtil.COMMA, "App內購買", "zh-TW"),

    HONGKONG("hk", "香港", "HK$", "HKD", StrUtil.COMMA, "App 內購買", "zh-HK"),

    JAPAN("jp", "日本", "¥", "JPY", StrUtil.COMMA, "アプリ内購入", "ja-JP"),

    KOREA("kr", "韩国", "₩", "KRW", StrUtil.COMMA, "앱 내 구입", "ko-KR"),

    PHILIPPINES("ph", "菲律宾", "₱", "PHP", StrUtil.COMMA, "In-App Purchases", "en-PH"),

    TURKEY("tr", "土耳其", "₺", "TRY", StrUtil.DOT, "In-App Purchases", "tr-TR"),

    NIGERIA("ng", "尼日利亚", "₦", "NGN", StrUtil.COMMA, "In-App Purchases", "en-NG"),

    INDIA("in", "印度", "₹", "INR", StrUtil.COMMA, "In-App Purchases", "en-IN"),

    PAKISTAN("pk", "巴基斯坦", "₨", "PKR", StrUtil.COMMA, "In-App Purchases", "en-PK"),

    BRAZIL("br", "巴西", "R$", "BRL", StrUtil.DOT, "Compras dentro do app", "pt-BR"),

    EGYPT("eg", "埃及", "E£", "EGP", StrUtil.COMMA, "In-App Purchases", "ar-EG-u-nu-latn"),
}

<script type="application/json" id="serialized-server-data">
[
  {
    "data": [
      {
        "data": {
          "title": "ChatGPT",
          "lockup": {
            "subtitle": "The official app by OpenAI",
            "offerDisplayProperties": {
              "priceFormatted": "Free"
            }
          },
          "developerAction": {
            "title": "OpenAI"
          },
          "shelfMapping": {
            "information": {
              "items": [
                {"title": "In-App Purchases", "items": [...]}
              ]
            }
          }
        }
      }
    ]
  }
]
</script>

// 锁外先查一次缓存（快路径）
List<X> cache = APP_LIST_CACHE.get(cacheKey);
if (CollUtil.isNotEmpty(cache)) return cache;

synchronized (lock) {
    // 锁内再查一次（防另一线程已经填充）
    cache = APP_LIST_CACHE.get(cacheKey);
    if (CollUtil.isNotEmpty(cache)) return cache;

    // ... 实际爬虫
}

private final static Cache<String, Map<String, BigDecimal>> RATE_CACHE =
    new TimedCache<>(Duration.ofDays(1L).toMillis(), new ConcurrentHashMap<>());

private Map<String, BigDecimal> getExchangeRateMap(String currencyCode) {
    if (Objects.nonNull(RATE_CACHE.get(currencyCode))) {
        return RATE_CACHE.get(currencyCode);
    }
    synchronized (ExchangeRateUtil.class) {
        if (Objects.nonNull(RATE_CACHE.get(currencyCode))) {
            return RATE_CACHE.get(currencyCode);
        }
        JSONObject result = JSON.parseObject(HttpUtil.get(
            StrUtil.format("https://open.er-api.com/v6/latest/{}", currencyCode)
        ));
        // ... 解析 + 缓存
    }
}

FROM amazoncorretto:21-alpine

ENV LANG=C.UTF-8
ENV TZ=Asia/Shanghai

RUN apk add --no-cache tzdata && \
    cp /usr/share/zoneinfo/${TZ} /etc/localtime && \
    echo "${TZ}" > /etc/timezone && \
    apk del tzdata && \
    rm -rf /var/cache/apk/*

WORKDIR /app
EXPOSE 8080
COPY ./target/app-store-price-*.jar ./app.jar

ENTRYPOINT ["java", "-jar", "app.jar"]