播放框架:依赖项注入操作生成器 [英] Play Framework: Dependency Inject Action Builder

问题描述

自Play Framework 2.4起，就有可能使用依赖注入(与Guice配合使用).

since Play Framework 2.4 there is the possibility to use dependency injection (with Guice).

在我的ActionBuilders中使用对象(例如AuthenticationService)之前:

Before I used objects (for example AuthenticationService) in my ActionBuilders:

object AuthenticatedAction extends ActionBuilder[AuthenticatedRequest] {
  override def invokeBlock[A](request: Request[A], block: (AuthenticatedRequest[A]) => Future[Result]): Future[Result] = {
    ...
    AuthenticationService.authenticate (...)
    ...
  }
}

现在，AuthenticationService不再是对象，而是一个类.我如何仍可以在ActionBuilder中使用AuthenticationService?

Now AuthenticationService is not an object anymore, but a class. How can I still use the AuthenticationService in my ActionBuilder?

推荐答案

使用身份验证服务作为抽象字段，在特征内定义动作构建器.然后将它们混合到您的控制器中，并在其中注入服务.例如:

Define your action builders inside a trait with the authentication service as an abstract field. Then mix them into your controllers, into which you inject the service. For example:

trait MyActionBuilders {
  // the abstract dependency
  def authService: AuthenticationService

  def AuthenticatedAction = new ActionBuilder[AuthenticatedRequest] {
    override def invokeBlock[A](request: Request[A], block(AuthenticatedRequest[A]) => Future[Result]): Future[Result] = {
      authService.authenticate(...)
      ...
    }
  }
}

和控制器:

@Singleton
class MyController @Inject()(authService: AuthenticationService) extends Controller with MyActionBuilders {    
  def myAction(...) = AuthenticatedAction { implicit request =>
    Ok("authenticated!")
  }
}

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