service-locator.ts

interface IServices {
  logger: ILogger,
  dataAccessService: IDataAccessService,
  ecommerceService: IECommerceService,
}

class ServiceLocator implements IServices {
  private _logger: ILogger | null = null;
  private _dataAccessService: IDataAccessService | null = null;
  private _ecommerceService: IECommerceService | null = null;

  get logger(): ILogger {
    if (this._logger === null) {
      this._logger = new Logger();
    }
    return this._logger;
  }

  set logger(value) {
    if (value != null) throw new Error("You cannot replace an item in the container");
    this._logger = null;
  }

  get dataAccessService() {
    if (this._dataAccessService === null) {
      this._dataAccessService = new DataAccessService(this.logger);
    }
    return this._dataAccessService
  }

  set dataAccessService(value) {
    if (value != null) throw new Error("You cannot replace an item in the container");
    this._dataAccessService = null;
  }
  
  get ecommerceService() {
    if (this._ecommerceService === null) {
      this._ecommerceService = new ECommerceService(this.logger, this.dataAccessService);
    }
    return this._ecommerceService;
  }

  set ecommerceService(value) {
    if (value != null) throw new Error("You cannot replace an item in the container");
    this._ecommerceService = null;
  }
}

export default new ServiceLocator();