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Which version of Scala, Akka are used in the book ?

2 replies on 1 page. Most recent reply: Oct 31, 2012 5:39 AM by Shing Hing Man

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Shing Hing Man

Posts: 9
Nickname: 84423
Registered: Oct, 2012

Which version of Scala, Akka are used in the book ? Posted: Oct 30, 2012 11:54 AM
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I am using Scala 2.9.2 and Akka 2.0.2.

On Page 111, in the object Avionics,
val control = Await.result(
(plane ? Plane.GiveMeControl).mapTo[ActorRef],5.seconds)

does not compile with error :
value ? is not a member of akka.actor.ActorRef


Instead of the above, the following compiles :
val future = Patterns.ask(plane, Plane.GiveMeControl, timeout);
val control = Await.result(future, timeout.duration).asInstanceOf[ActorRef]


May I know which version of Scala and Akka are used in the book.

Thanks in advance for any assistance !

Shing


Derek Wyatt

Posts: 64
Nickname: dwyatt
Registered: Oct, 2012

Re: Which version of Scala, Akka are used in the book ? Posted: Oct 31, 2012 4:54 AM
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At the time of writing, it was Scala 2.10.0-M7 and Akka 2.1-M2. When everything finally solidifies, I'll be switching it to 2.10.0 and 2.1 proper. You should be able to use 2.10.0-RC1 and 2.1-RC1 and have no issues.

But, I think you're just missing the pattern import.

import akka.pattern.ask

and you should get the '?' method added on to the ActorRef.

Cheers,
Derek

Shing Hing Man

Posts: 9
Nickname: 84423
Registered: Oct, 2012

Re: Which version of Scala, Akka are used in the book ? Posted: Oct 31, 2012 5:39 AM
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I have tried your suggestion and it works.

Thanks!

Shing

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