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.
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