[英]How to work with Source.Queue in Akka-Stream
I am toying around trying to use a source.queue from an Actor. 我正在尝试使用来自Actor的source.queue。 I am stuck in parttern match the result of an offer operation
我陷入了要约操作的结果
class MarcReaderActor(file: File, sourceQueue: SourceQueueWithComplete[Record]) extends Actor {
val inStream = file.newInputStream
val reader = new MarcStreamReader(inStream)
override def receive: Receive = {
case Process => {
if (reader.hasNext()) {
val record = reader.next()
pipe(sourceQueue.offer(record)) to self
}
}
case f:Future[QueueOfferResult] =>
}
}
}
I don't know how to check if it was Enqueued or Dropped or Failure 我不知道如何检查它是否入队,掉线或失败
if i write f:Future[QueueOfferResult.Enqueued] the compile complain 如果我写f:Future [QueueOfferResult.Enqueued]编译会抱怨
Since you use pipeTo
, you do no need to match on futures - the contents of the future will be sent to the actor when this future is completed, not the future itself. 由于您使用
pipeTo
,因此您无需匹配期货-将来的内容将在该将来完成时发送给角色,而不是将来本身。 Do this: 做这个:
override def receive: Receive = {
case Process =>
if (reader.hasNext()) {
val record = reader.next()
pipe(sourceQueue.offer(record)) to self
}
case r: QueueOfferResult =>
r match {
case QueueOfferResult.Enqueued => // element has been consumed
case QueueOfferResult.Dropped => // element has been ignored because of backpressure
case QueueOfferResult.QueueClosed => // the queue upstream has terminated
case QueueOfferResult.Failure(e) => // the queue upstream has failed with an exception
}
case Status.Failure(e) => // future has failed, e.g. because of invalid usage of `offer()`
}
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.