Question

因为Play Framework 2.4可以使用依赖注入（使用Guice）。

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

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

现在AuthenticationService不再是一个对象，而是一个类。如何在我的AuthenticationService中使用ActionBuilder？

Answer 1

使用身份验证服务作为抽象字段在特征中定义操作构建器。然后将它们混合到您注入服务的控制器中。例如：

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!")
  }
}

Answer 2

我喜欢接受的答案，但由于某种原因，编译器无法识别authService引用。只需在方法签名中发送服务，我就可以很轻松地解决这个问题了......

class Authentication @Inject()(authenticationService: AuthenticationService) extends Controller with ActionBuilders {

  def testAuth = AuthenticatedAction(authenticationService).async { implicit request =>
    Future.successful(Ok("Authenticated!"))
  }

}

Play Framework：Dependency Inject Action Builder

2 个答案: