NewRepository.swift

final class Repository: Chainable {
  var before: (()->())?
  
  private let dataProdider: DataProvider
  init(dataProdider: DataProvider = .init()) {
    self.dataProdider = dataProdider
  }
  
  func getItem(onSuccess: @escaping (Item)->(), onError: @escaping (Error)->()) {
    //background async request
    dataProvider.request.items { [weak self] data, error in
      self?.invoke()
      if let item = ItemBuilder(with: data) {
        onSuccess(item)
      } else {
        onError(error)
      }
    }
  }
}