class OrderMgr {

  init() {
    this.fetching = false;
    this.fetchOrerTimer = setInterval(() => {
      this.fetchOrder();
    }, 3000);
  }

  fetchOrder() {
    if (this.fetching) {
      return;
    }
    this.fetching = true;
    new Promise((reslove) => {

    });
  }

}

var _instance = new OrderMgr();

module.exports = _instance;