akka.dispatch

SystemMessage

sealed trait SystemMessage extends PossiblyHarmful

System messages are handled specially: they form their own queue within each actor’s mailbox. This queue is encoded in the messages themselves to avoid extra allocations and overhead. The next pointer is a normal var, and it does not need to be volatile because in the enqueuing method its update is immediately succeeded by a volatile write and all reads happen after the volatile read in the dequeuing thread. Afterwards, the obtained list of system messages is handled in a single thread only and not ever passed around, hence no further synchronization is needed.

➡➡➡ NEVER SEND THE SAME SYSTEM MESSAGE OBJECT TO TWO ACTORS ⬅⬅⬅

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@deprecated
Deprecated

(Since version 2.0.2) Will become private[akka] in 2.1, this is not user-api

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  1. final def !=(arg0: AnyRef): Boolean

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  14. final def ne(arg0: AnyRef): Boolean

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  15. var next: SystemMessage

  16. final def notify(): Unit

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  17. final def notifyAll(): Unit

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  18. final def synchronized[T0](arg0: ⇒ T0): T0

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