Sink.lazyInitAsync

Creates a real Sink upon receiving the first element.

Sink operators

Signature

def lazyInitAsync[T, M](sinkFactory: () ⇒ Future[Sink[T, M]]): Sink[T, Future[Option[M]]]

Description

Creates a real Sink upon receiving the first element. Internal Sink will not be created if there are no elements, because of completion or error.

  • If upstream completes before an element was received then the FutureCompletionStage is completed with Nonean empty Optional.
  • If upstream fails before an element was received, sinkFactory throws an exception, or materialization of the internal sink fails then the FutureCompletionStage is completed with the exception.
  • Otherwise the FutureCompletionStage is completed with the materialized value of the internal sink.

cancels never

backpressures when initialized and when created sink backpressures

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