[英]How to run Akka Streams graph on a separate dispatcher with timeout?
This question is based on a pet project that I did and this SO thread. 这个问题基于我做过的宠物项目和这个SO线程。 Inside a Akka HTTP route definition, I start a long-running process, and naturally I want to do that without blocking the user.
在Akka HTTP路由定义中,我启动了一个长时间运行的进程,当然我想在不阻塞用户的情况下这样做。 I'm able to achieve this with the code snippet below:
我可以使用下面的代码片段实现此目的:
blocking-io-dispatcher {
type = Dispatcher
executor = "thread-pool-executor"
thread-pool-executor {
fixed-pool-size = 16
}
throughput = 1
}
complete {
Try(new URL(url)) match {
case scala.util.Success(u) => {
val src = Source.fromIterator(() => parseMovies(u).iterator)
src
.via(findMovieByTitleAndYear)
.via(persistMovies)
.toMat(Sink.fold(Future(0))((acc, elem) => Applicative[Future].map2(acc, elem)(_ + _)))(Keep.right)
// run the whole graph on a separate dispatcher
.withAttributes(ActorAttributes.dispatcher("blocking-io-dispatcher"))
.run.flatten
.onComplete {
_ match {
case scala.util.Success(n) => logger.info(s"Created $n movies")
case Failure(t) => logger.error(t, "Failed to process movies")
}
}
Accepted
}
case Failure(t) => logger.error(t, "Bad URL"); BadRequest -> "Bad URL"
}
}
What's the problem then if I've already solved it? 如果我已经解决了那么问题是什么? The problem is that I'm not sure how to set a timeout.
问题是我不确定如何设置超时。 The execution of the graph creates a
Future
that executes until complete on the dedicated blocking-io-dispatcher
. 图表的执行创建了一个
Future
,它在专用的blocking-io-dispatcher
上执行直到完成。 If I add a Await
call, the code blocks. 如果我添加一个
Await
调用,代码会阻塞。 Is there a way to put a timeout? 有没有办法暂停?
completionTimeout
stage should help here. completionTimeout
阶段应该有帮助。 Example below: 示例如下:
src
.completionTimeout(5.seconds)
...
.run.flatten
.onComplete {
case scala.util.Success(n) => logger.info(s"Created $n movies")
case Failure(t: TimeoutException) => logger.error(t, "Timed out")
case Failure(t) => logger.error(t, "Failed to process movies")
}
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