是否可以在 Play Framework 2.5 上使用 Java Akka 访问 actor 中的 Http 上下文

Question

I'm using JavaAkka to execute some tasks when the Actor receive any message. When my actor receive a message, I'd like to execute some functions from one of the my controllers, however there are inside of these functions uses of http context as:

ctx().messages().at("sensor_alert");

or

session().get("id");

And I get the error:

[error] 2017-02-02 13:06:54 -0300 a.a.OneForOneStrategy - There is no HTTP Context available from here.
java.lang.RuntimeException: There is no HTTP Context available from here.
    at play.mvc.Http$Context.current(Http.java:62)
    at play.mvc.Controller.ctx(Controller.java:27)
    at controllers.IpmiMonitorController.gerarAlertas(IpmiMonitorController.java:370)
    at actor.IpmiActor.onReceive(IpmiActor.java:27)
    at akka.actor.UntypedActor$$anonfun$receive$1.applyOrElse(UntypedActor.scala:165)
    at akka.actor.Actor$class.aroundReceive(Actor.scala:484)
    at akka.actor.UntypedActor.aroundReceive(UntypedActor.scala:95)
    at akka.actor.ActorCell.receiveMessage(ActorCell.scala:526)
    at akka.actor.ActorCell.invoke(ActorCell.scala:495)
    at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:257)

Is there any solution?

Answer 1

Your HTTP context should go no further than your controller layer, otherwise you'll find yourself with inappropriate coupling.

Additionally, why would you invoke a method on a controller from an actor? Controllers are meant to handle incoming HTTP requests. Is it possible this method doesn't belong in a controller?

If you're generating alerts, where are the alerts going to? If it's the database, inject a DAO into the actor. If it's going into a HTTP request, inject a web service client or similar into the actor.