Getting access to an existing ActorSystem inside a trait

Question

I'm using Spray for REST endpoints. How can I get access to an existing ActorSystem inside a trait?
I don't want to create a new ActorSystem inside my trait (if possible) but rather reuse my existing ActorSystem. I'm using this Redis client library.

trait MySprayService extends HttpService with Json4sSupport {

   //the following line requires an implicit ActorSystem 
   val redis = RedisClient(ip,port) 
   ....
   ....
   val simpleRoute = path("simple" / "route") {
       get {
          complete {
             //use Redis here
          }
       }
   }

}

Answer 1

You can create abstract method which returns ActorSystem and then deliver implementation in a class which will extends this trait.

trait MySprayService extends HttpService with Json4sSupport {

       implicit def as: ActorSystem 
       //the following line requires an implicit ActorSystem 
       val redis = RedisClient(ip,port) 
       ....
       ....
       val simpleRoute = path("simple" / "route") {
           get {
              complete {
                 //use Redis here
              }
           }
       }

    }