Why Resume, Restart, Stop and Escalate are Product?

[Jiansen]

From the Akka documentation: http://doc.akka.io/api/akka/2.1.4/index.html#akka.actor.SupervisorStrategy$$Escalate$

sealed trait Directive extends AnyRef

object Escalate extends Directive with Product with Serializable

object Restart extends Directive with Product with Serializable

object Resume extends Directive with Product with Serializable

object Stop extends Directive with Product with Serializable

In the source code: https://github.com/akka/akka/blob/master/akka-actor/src/main/scala/akka/actor/FaultHandling.scala#L97

sealed trait Directive
case object Resume extends Directive
case object Restart extends Directive
case object Stop extends Directive
case object Escalate extends Directive

Why they are different?  Are not Akka documentation generated by scala doc?  Why Escalate etc. are Product?

[Roland Kuhn]

Hi Jiansen,

these are `case object`s in the source, which is translated by the compiler by adding some super-interfaces and methods (like a pretty toString representation). It would indeed be helpful if scaladoc emitted that instead of these traits.

Regards,

Roland

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Typesafe – Reactive apps on the JVM.
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[Jiansen He]

Thanks Roland.   -- Jiansen

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