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!")
}
}
这篇关于播放框架:依赖项注入操作生成器的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!