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package org.apache.james.task.eventsourcing

import org.apache.james.eventsourcing.{Event, Subscriber}
import org.reactivestreams.Publisher
import reactor.core.publisher.DirectProcessor

trait TerminationSubscriber extends Subscriber {
  override def handle(event: Event): Unit = event match {
    case event: TerminalTaskEvent => addEvent(event)
    case _ =>
  }

  def addEvent(event: Event): Unit

  def listenEvents: Publisher[Event]
}

class MemoryTerminationSubscriber extends TerminationSubscriber {
  private val events: DirectProcessor[Event] = DirectProcessor.create[Event]()

  override def addEvent(event: Event): Unit =
    events.onNext(event)

  override def listenEvents: Publisher[Event] =
    events.share()
}