HarmonyOS 如何进行同步代码编程

网络请求使用cookie（有效期30分钟），手机锁屏超30分钟以上。假如打开APP后同时发起五个请求，如何只确保刷新一次cookie，HarmonyOS中如何实现？okhttp请求拦截器代码（假如同时拦截到五次请求过期）。

async intercept(chain: Chain): Promise<Response> {
  let request = chain.requestI();
  let response = await chain.proceedI(request);
  if (!response.isSuccessful()) {
    // url重定向login，刷新cookie
    let time: number = systemDateTime.getTime(false)
    let timeDelay = time - ApiUtils.refreshCookieTime
    if (response.responseCode == HttpErrorCode.Forbidden) {
      let locationUrl = response.getHeadersEntry('location')
      if (locationUrl == ApiUtils.getXwebRequestUrl(Constant.webLogin)) {
        LogUtils.warn(API, `cookie timeout !!!, refreshSession, timeDelay : ${timeDelay}}`)
        let resp = await ApiUtils.refreshSession() as BaseResp<object>
        if (resp.code == HttpErrorCode.Success) {
          request.addHeader(ApiUtils.HEADER_COOKIE_KEY, ApiUtils.getCookie())
          LogUtils.info(API, '使用新cookie请求 : ' + request.getHeader(ApiUtils.HEADER_COOKIE_KEY))
          response = await chain.proceedI(request) // 重新发起请求
        }
      }
    }
  }
  response = await DecryptInterceptor.parseHttpResponse(chain, response)
  return response
}

/**
 * 刷新cookie
 * @param chain
 */
public static async refreshSession(): Promise<BaseResp<object>> {
  return new Promise((resolve: Function) => {
    let resp: BaseResp<object> = new BaseResp<object>()
    LogUtils.info(API, 'refreshSession start time : ' + systemDateTime.getTime(false))
    Api.getXWebService().refreshSession().then(response => {
      let faildMsg = ApiUtils.getFailMsg(response) as FaildMsg
      if (null != faildMsg) {
        LogUtils.warn(API, 'refreshSession faild : ' + faildMsg.getMsg())
        resp.code = HttpErrorCode.Fail
      } else {
        ApiUtils.refreshCookieTime = systemDateTime.getTime(false)
        LogUtils.info(API, 'refreshSession success, time : ' + ApiUtils.refreshCookieTime)
      }
      resolve(resp)
    }).catch(
      (error: Error) => {
        LogUtils.error(API, 'refreshSession error : ' + error.message)
        resp.code = HttpErrorCode.Fail
        resolve(resp)
      }
    )
  })
}