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trait Observer[-A] extends Serializable

The Observer from the Rx pattern is the trio of callbacks that get subscribed to an Observable for receiving events.

The events received must follow the Rx grammar, which is: onNext * (onComplete | onError)?

That means an Observer can receive zero or multiple events, the stream ending either in one or zero onComplete or onError (just one, not both), and after onComplete or onError, a well behaved Observable implementation shouldn't send any more onNext events.

Source
Observer.scala
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Abstract Value Members

  1. abstract def getClass(): Class[_ <: AnyRef]
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  2. abstract def onComplete(): Unit
  3. abstract def onError(ex: Throwable): Unit
  4. abstract def onNext(elem: A): Future[Ack]

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  1. final def !=(arg0: Any): Boolean
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  2. final def ##(): Int
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  3. final def ==(arg0: Any): Boolean
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  4. final def asInstanceOf[T0]: T0
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  5. def equals(arg0: Any): Boolean
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  6. def hashCode(): Int
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  7. final def isInstanceOf[T0]: Boolean
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  8. def toString(): String
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