Hi,
I wonder what is happening behind the scene is spray .....
Why do we have to call actor shutdown for the application to actually
terminate here.
What i mean is that, usually in the main thread of my akka appliation. I
will have an awaitTermination. If i don't have this there is no need to
call a shutdown anyway, because the main will end and the program with it.
I have tested and commented the shutdown method and indeed it does not
terminate.
Please could you explain ?
object Main extends App {
// we need an ActorSystem to host our application in
implicit val system = ActorSystem("simple-spray-client")
import system.dispatcher // execution context for futures below
val log = Logging(system, getClass)
log.info("Requesting the elevation of Mt. Everest from Googles Elevation
API...")
import ElevationJsonProtocol._
import SprayJsonSupport._
val pipeline = sendReceive ~> unmarshal[GoogleApiResult[Elevation]]
val responseFuture = pipeline {
Get("http://maps.googleapis.com/maps/api/elevation/json?locations=27.988056,86.925278&sensor=false";)
}
responseFuture onComplete {
case Success(GoogleApiResult(_, Elevation(_, elevation) :: _)) =>
log.info("The elevation of Mt. Everest is: {} m", elevation)
shutdown()
case Success(somethingUnexpected) =>
log.warning("The Google API call was successful but returned something
unexpected: '{}'.", somethingUnexpected)
shutdown()
case Failure(error) =>
log.error(error, "Couldn't get elevation")
shutdown()
}
def shutdown(): Unit = {
IO(Http).ask(Http.CloseAll)(1.second).await
system.shutdown()
}
}
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