Not working example of aroundRecive usage. Hook mdc(msg) is called after Contextual decoration.

AroundReceive.scala

trait MessageContext {

  implicit var msgCtx: Option[MsgCtx] = None

  def doWithContext(message: Any)(f: Any => Unit): Unit = {
    val (ctx, msg) = message match {
      case wrapper: Msg[_] => (wrapper.ctx, wrapper.msg)
      case other => (None, other)
    }
    msgCtx = ctx
    f(msg)
    msgCtx = None
  }
}

// DiagnosticActorLogging already overrides aroundReceive
trait Logging extends DiagnosticActorLogging {
  this: MessageContext =>

  override def mdc(currentMessage: Any): event.Logging.MDC = {
    // this happens after ContextualActor decoration,
    // so message is still wrapped and context is None
    msgCtx.map(c => Map("requestId" -> c.attr)).getOrElse(Map())
  }
}

//------- In Akka space --------//
package akka

trait ContextualActor extends Actor with MessageContext {
  protected[akka] override def aroundReceive(receive: Actor.Receive, msg: Any): Unit = {
    doWithContext(msg) {m => super.aroundReceive(receive, m)}
  }
}
//------------------------------//

trait BaseActor extends akka.ContextualActor with Logging