trait SourceQueue[T] extends AnyRef
This trait allows to have the queue as a data source for some stream.
- Source
- Queue.scala
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abstract
def
offer(elem: T): Future[QueueOfferResult]
Method offers next element to a stream and returns future that: - completes with
Enqueued
if element is consumed by a stream - completes withDropped
when stream dropped offered element - completes withQueueClosed
when stream is completed during future is active - completes withFailure(f)
when failure to enqueue element from upstream - fails when stream is completedMethod offers next element to a stream and returns future that: - completes with
Enqueued
if element is consumed by a stream - completes withDropped
when stream dropped offered element - completes withQueueClosed
when stream is completed during future is active - completes withFailure(f)
when failure to enqueue element from upstream - fails when stream is completedAdditionally when using the backpressure overflowStrategy: - If the buffer is full the Future won't be completed until there is space in the buffer - Calling offer before the Future is completed in this case will return a failed Future
- elem
element to send to a stream
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abstract
def
watchCompletion(): Future[Done]
Method returns a Future that will be completed if this operator completes, or will be failed when the operator faces an internal failure.
Method returns a Future that will be completed if this operator completes, or will be failed when the operator faces an internal failure.
Note that this only means the elements have been passed downstream, not that downstream has successfully processed them.