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Ch 6: page 133

2 replies on 1 page. Most recent reply: Dec 6, 2012 10:59 AM by Mirco Dotta

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Mirco Dotta

Posts: 4
Nickname: mirco
Registered: Jul, 2011

Ch 6: page 133 Posted: Dec 2, 2012 1:07 PM
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Hi Derek,

I'm looking at the below testing code and I believe it is incorrect.
"send the event to our test actor" in {
val testA = TestActorRef[TestEventSource]
testA ! RegisterListener(testActor)
testA.underlyingActor.sendEvent("Fibonacci")
expectMsg("Fibonacci")
}

Specifically, `testA.underlyingActor.sendEvent("Fibonacci")` could be executed before the testA actor has a chance to process the RegisterListener message, because the two are ran on different threads.


Derek Wyatt

Posts: 64
Nickname: dwyatt
Registered: Oct, 2012

Re: Ch 6: page 133 Posted: Dec 3, 2012 5:14 AM
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There's a little trick involved in the TestActorRef - and the book doesn't make this clear at all - it overrides the dispatcher to use the CallingThreadDispatcher. So, there's no race condition here.

I'll have to see if I can make this more clear.

Mirco Dotta

Posts: 4
Nickname: mirco
Registered: Jul, 2011

Re: Ch 6: page 133 Posted: Dec 6, 2012 10:59 AM
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Ooooh, I see, really elegant. Nice trick!

Thanks a lot.

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