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Ch 9.4, why two setCourse

1 reply on 1 page. Most recent reply: Jul 26, 2013 6:58 AM by Derek Wyatt

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Chifeng Chou

Posts: 2
Nickname: cfchou
Registered: Jul, 2013

Ch 9.4, why two setCourse Posted: Jul 25, 2013 5:47 AM
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Firstly I wanted to thank Derek for writing this nice book. The examples used in this book are fun and clear.

Now I have a question with respect to Ch 9.4(p.251 in the printed book) where it explains the reason why there are two setCourse is FlyingBehaviour only accepts Fly message in the Flying state. I'm a bit confused about this. I suspect that it meant Idle state, since FlyingBehaviour can fall back to Idle in many situations so we need to send Fly message again i.e.

override def unhandled(msg: Any): Unit = {
msg match {
case Transation(_, _, Flying) =>
// ???
// setCourse(sender)
case Transation(_, _, Idle) =>

Derek Wyatt

Posts: 69
Nickname: dwyatt
Registered: Oct, 2012

Re: Ch 9.4, why two setCourse Posted: Jul 26, 2013 6:58 AM
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Hi Chifeng,

I think you're right. I'll have to take a closer look, but based on what I can see at the moment, it looks like I've got the code in the wrong spot.

Either way, I think you've got the idea, even more so if you've found a bug :)


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