角2.2.0注入从RC5 =>开关注入迁移而来

Question

我有一个令人惊讶的问题，因为我将代码从RC5 2迁移到了2.2.0。我将服务注入到其他服务中，如：

  constructor(_http:Http,
          _cachingServices:CachingServices,
          _globalServices:GlobalServices,
          _dataServices:DataServices,
          _notificationServices:NotificationServices)

这在RC5中运行得很好，但是现在2.2.0版本的注入是混合的！以下代码：

  // Constructor
  constructor(_http:Http,
          _cachingServices:CachingServices,
          _globalServices:GlobalServices,
          _dataServices:DataServices,
          _notificationServices:NotificationServices){

console.debug(this.className + " param globalServices  => ",_globalServices);
console.debug(this.className + " param cachingServices => ",_cachingServices);
console.debug(this.className + " param dataServices => ",_dataServices);
console.debug(this.className + " param notificationServices => ",_notificationServices);

 }

给我以下结果：

  TranslateServices param globalServices  =>  DataServices {connectionStrings: Object, mode: "dev", magicServices: MagicServices, apiURL: "http://127.0.0.1/api.php", baseURL: "http://localhost:3000"}
  TranslateServices param cachingServices =>  CachingServices {expiration: EventEmitter, cacheduration: 400000}
  TranslateServices param dataServices =>  NotificationServices {notification: EventEmitter, types: Object, notification_one_like_per_day: "notification_one_like_per_day", notification_one_message_per_day: "notification_one_message_per_day", notification_thanks_for_message: "notification_thanks_for_message"…}
  TranslateServices param notificationServices =>  GlobalServices {mode: "dev", apiURL: "http://127.0.0.1/api.php", baseURL: "http://localhost:3000"}

错误=>服务引用是混合的！我已经找了一段时间了，一直没有回答。

谢谢!

Answer 1

天哪！真是个可疑的问题。我的解决方案有几个服务。其中每个引用另一个服务，但没有循环引用。

让我们使用两个服务：translate.services.ts

  export class TranslateServices extends BaseServices {

  // Constructor
  constructor(_http:Http,
              _globalServices:GlobalServices,
              _cachingServices:CachingServices,
              _dataServices:DataServices,
              _notificationServices:NotificationServices,
              _ipServices:IPServices,
              _configurationServices:ConfigurationServices){
  }
}

和user.services.ts

export class UserServices extends BaseServices {

  constructor(_http:Http,
              _globalServices:GlobalServices,
              _cachingServices:CachingServices,
              _dataServices:DataServices,
              _notificationServices:NotificationServices,
              _ipServices:IPServices,
              _cookieServices:CookieServices) {
  }
}

我们可以看到，translate.services注入configuration.services和user.services注入cookie.services.

在我的示例中，如果首先初始化translate.services，则以下命令：

    console.debug("TranslateServices _configurationServices => ",_configurationServices);
    console.debug("UserServices _cookieServices => ",_cookieServices);

将提供以下输出：

TranslateServices _configurationServices => ConfigurationServices
UserServices _cookieServices => ConfigurationServices

如果首先初始化user.services，则相同的命令：

    console.debug("TranslateServices _configurationServices => ",_configurationServices);
    console.debug("UserServices _cookieServices => ",_cookieServices);

将提供以下输出：

TranslateServices _configurationServices => CookieServices
UserServices _cookieServices => CookieServices

参数_cookieServices和_configurationServices的位置似乎很重要，即使它们处于两个不同的服务中。

为了处理这一问题，我必须在两家服务机构签署相同的签名：

    export class TranslateServices extends BaseServices {

  constructor(_http:Http,
              _globalServices:GlobalServices,
              _cachingServices:CachingServices,
              _dataServices:DataServices,
              _notificationServices:NotificationServices,
              _ipServices:IPServices,
              _configurationServices:ConfigurationServices
              _cookieServices:CookieServices) {
  }
}

export class UserServices extends BaseServices {

  constructor(_http:Http,
              _globalServices:GlobalServices,
              _cachingServices:CachingServices,
              _dataServices:DataServices,
              _notificationServices:NotificationServices,
              _ipServices:IPServices,
              _configurationServices:ConfigurationServices
              _cookieServices:CookieServices) {
  }
}

这似乎不是正常的行为。我费了很大的劲才找到了解释的开始。希望这个错误能在一个不加限制的版本中得到纠正。

如果有人能给我更多的解释，我想。