server/src/LiveMessages.scala


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package triad

import akka.NotUsed
import akka.stream.scaladsl.{
  BroadcastHub,
  Keep,
  Source,
  SourceQueueWithComplete
}
import akka.stream.{Materializer, OverflowStrategy}

class LiveMessages(implicit materializer: Materializer) {

  private val (
    in: SourceQueueWithComplete[Message],
    out: Source[Message, NotUsed]
  ) = Source
    .queue[Message](10, OverflowStrategy.dropTail)
    .toMat(BroadcastHub.sink[Message])(Keep.both)
    .run()

  def push(message: Message) = in.offer(message)
  def feed = out

}