Packages

abstract class Topic[F[_], A] extends AnyRef

Asynchronous Topic.

Topic allows you to distribute A published by arbitrary number of publishers to arbitrary number of subscribers.

Topic has built-in back-pressure support implemented as maximum bound (maxQueued) that a subscriber is allowed to enqueue. Once that bound is hit, publishing may semantically block until the lagging subscriber consumes some of its queued elements.

Additionally the subscriber has possibility to terminate whenever size of enqueued elements is over certain size by using subscribeSize.

Self Type
Topic[F, A]
Source
Topic.scala
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Instance Constructors

  1. new Topic()

Abstract Value Members

  1. abstract def publish: Pipe[F, A, Unit]

    Publishes elements from source of A to this topic and emits a unit for each element published.

    Publishes elements from source of A to this topic and emits a unit for each element published. Pipe equivalent of publish1.

  2. abstract def publish1(a: A): F[Unit]

    Publishes one A to topic.

    Publishes one A to topic.

    This waits until a is published to all subscribers. If any of the subscribers is over the maxQueued limit, this will wait to complete until that subscriber processes enough of its elements such that a is enqueued.

  3. abstract def subscribe(maxQueued: Int): Stream[F, A]

    Subscribes for A values that are published to this topic.

    Subscribes for A values that are published to this topic.

    Pulling on the returned stream opens a "subscription", which allows up to maxQueued elements to be enqueued as a result of publication.

    The first element in the stream is always the last published A at the time the stream is first pulled from, followed by each published A value from that point forward.

    If at any point, the queue backing the subscription has maxQueued elements in it, any further publications semantically block until elements are dequeued from the subscription queue.

    maxQueued

    maximum number of elements to enqueue to the subscription queue before blocking publishers

  4. abstract def subscribeSize(maxQueued: Int): Stream[F, (A, Int)]

    Like subscribe but emits an approximate number of queued elements for this subscription with each emitted A value.

  5. abstract def subscribers: Stream[F, Int]

    Signal of current active subscribers.

Concrete Value Members

  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 clone(): AnyRef
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    @throws(classOf[java.lang.CloneNotSupportedException]) @native() @HotSpotIntrinsicCandidate()
  6. final def eq(arg0: AnyRef): Boolean
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  7. def equals(arg0: AnyRef): Boolean
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  8. final def getClass(): Class[_ <: AnyRef]
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  9. def hashCode(): Int
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  10. def imap[B](f: (A) => B)(g: (B) => A): Topic[F, B]

    Returns an alternate view of this Topic where its elements are of type B, given two functions, A => B and B => A.

  11. final def isInstanceOf[T0]: Boolean
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  12. final def ne(arg0: AnyRef): Boolean
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  13. final def notify(): Unit
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  14. final def notifyAll(): Unit
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  15. final def synchronized[T0](arg0: => T0): T0
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  16. def toString(): String
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  17. final def wait(arg0: Long, arg1: Int): Unit
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    @throws(classOf[java.lang.InterruptedException])
  18. final def wait(arg0: Long): Unit
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    @throws(classOf[java.lang.InterruptedException]) @native()
  19. final def wait(): Unit
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Deprecated Value Members

  1. def finalize(): Unit
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    @throws(classOf[java.lang.Throwable]) @Deprecated
    Deprecated

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