Question

我正在使用akka-persistence的PersistenceQuery将初始状态加载到管理内容的actor。我希望它在启动时只重放一次，但它会继续将它们发送到日志。

14:11:28.405 [rooms-akka.actor.default-dispatcher-4] DEBUG a.p.q.j.l.LiveEventsByPersistenceIdPublisher - request replay for persistenceId [rooms] from [4] to [9223372036854775807] limit [100]
14:11:28.407 [rooms-akka.actor.default-dispatcher-17] DEBUG a.p.q.j.l.LiveEventsByPersistenceIdPublisher - replay completed for persistenceId [rooms], currSeqNo [4]
14:11:31.376 [rooms-akka.actor.default-dispatcher-17] DEBUG a.p.q.j.l.LiveEventsByPersistenceIdPublisher - request replay for persistenceId [rooms] from [4] to [9223372036854775807] limit [100]
14:11:31.377 [rooms-akka.actor.default-dispatcher-17] DEBUG a.p.q.j.l.LiveEventsByPersistenceIdPublisher - replay completed for persistenceId [rooms], currSeqNo [4]
14:11:34.376 [rooms-akka.actor.default-dispatcher-4] DEBUG a.p.q.j.l.LiveEventsByPersistenceIdPublisher - request replay for persistenceId [rooms] from [4] to [9223372036854775807] limit [100]
14:11:34.378 [rooms-akka.actor.default-dispatcher-4] DEBUG a.p.q.j.l.LiveEventsByPersistenceIdPublisher - replay completed for persistenceId [rooms], currSeqNo [4]

这是我试图实现它的程序。

implicit val mat = ActorMaterializer()(context)
val queries = PersistenceQuery(context.system).readJournalFor[LeveldbReadJournal](
      LeveldbReadJournal.Identifier)
val src: Source[EventEnvelope, NotUsed] = queries.eventsByPersistenceId("rooms", 0L, Long.MaxValue)
val events: Source[Any, NotUsed] = src.map(_.event)
val future = events.runWith(Sink.foreach{
  case x: RoomCreated => process(x)
  case x: RoomDeleted => process(x)
  case x => logger.error(s"Could not spawn $x")
})

Answer 1

我认为您的预期行为与您实际看到的不同之处在于eventsByPersistenceId是＆＃34;直播＆＃34;流。这意味着它不仅会返回从您提供的偏移范围内开始的事件（您从0开始并转到Long.MaxValue，所以所有内容），但是如果它们进来时会继续向您发送新事件。如果您没有＆＃ 39;想要直播，然后将呼叫更改为currentEventsByPersistenceId。这将仅包括截至该时间点（您提出请求的时间）并且不是实时流。这应该是你正在寻找的。

只读一次日记

1 个答案: