object MergeHub
A MergeHub is a special streaming hub that is able to collect streamed elements from a dynamic set of producers. It consists of two parts, a Source and a Sink. The Source streams the element to a consumer from its merged inputs. Once the consumer has been materialized, the Source returns a materialized value which is the corresponding Sink. This Sink can then be materialized arbitrary many times, where each of the new materializations will feed its consumed elements to the original Source.
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- Hub.scala
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- sealed trait DrainingControl extends AnyRef
A DrainingControl object is created during the materialization of a MergeHub and allows to initiate the draining and eventual completion of the Hub from the outside.
- final class ProducerFailed extends RuntimeException
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- def source[T]: Source[T, Sink[T, NotUsed]]
Creates a Source that emits elements merged from a dynamic set of producers.
Creates a Source that emits elements merged from a dynamic set of producers. After the Source returned by this method is materialized, it returns a Sink as a materialized value. This Sink can be materialized arbitrary many times and each of the materializations will feed the elements into the original Source.
Every new materialization of the Source results in a new, independent hub, which materializes to its own Sink for feeding that materialization.
Completed or failed Sinks are simply removed. Once the Source is cancelled, the Hub is considered closed and any new producers using the Sink will be cancelled.
- def source[T](perProducerBufferSize: Int): Source[T, Sink[T, NotUsed]]
Creates a Source that emits elements merged from a dynamic set of producers.
Creates a Source that emits elements merged from a dynamic set of producers. After the Source returned by this method is materialized, it returns a Sink as a materialized value. This Sink can be materialized arbitrary many times and each of the materializations will feed the elements into the original Source.
Every new materialization of the Source results in a new, independent hub, which materializes to its own Sink for feeding that materialization.
Completed or failed Sinks are simply removed. Once the Source is cancelled, the Hub is considered closed and any new producers using the Sink will be cancelled.
- perProducerBufferSize
Buffer space used per producer. Default value is 16.
- def sourceWithDraining[T](): Source[T, (Sink[T, NotUsed], DrainingControl)]
Creates a Source that emits elements merged from a dynamic set of producers.
Creates a Source that emits elements merged from a dynamic set of producers. After the Source returned by this method is materialized, it returns a Sink as a materialized value. This Sink can be materialized arbitrary many times and each of the materializations will feed the elements into the original Source.
Every new materialization of the Source results in a new, independent hub, which materializes to its own Sink for feeding that materialization.
Completed or failed Sinks are simply removed. Once the Source is cancelled, the Hub is considered closed and any new producers using the Sink will be cancelled.
The materialized DrainingControl can be used to drain the Hub: any new producers using the Sink will be cancelled and the Hub will be closed completing the Source as soon as all currently connected producers complete.
- def sourceWithDraining[T](perProducerBufferSize: Int): Source[T, (Sink[T, NotUsed], DrainingControl)]
Creates a Source that emits elements merged from a dynamic set of producers.
Creates a Source that emits elements merged from a dynamic set of producers. After the Source returned by this method is materialized, it returns a Sink as a materialized value. This Sink can be materialized arbitrary many times and each of the materializations will feed the elements into the original Source.
Every new materialization of the Source results in a new, independent hub, which materializes to its own Sink for feeding that materialization.
Completed or failed Sinks are simply removed. Once the Source is cancelled, the Hub is considered closed and any new producers using the Sink will be cancelled.
The materialized DrainingControl can be used to drain the Hub: any new producers using the Sink will be cancelled and the Hub will be closed completing the Source as soon as all currently connected producers complete.
- perProducerBufferSize
Buffer space used per producer. Default value is 16.
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