not technically incorrect... it did compile, after all :) it produced
an unexpected result due to type erasure. Type erasure means the type T
of Success[T] is only available at compile time, and is lost at
runtime. check your compiler output, you should have seen a warning to
that effect. see also
http://en.wikipedia.org/wiki/Generics_in_Java#Problems_with_type_erasure
atomly's version makes the type explicit in the pattern match, so the
type is available at runtime.
-Michael
On 09/30/14 12:41, bearrito wrote:
Yes this works, is my version considered incorrect?
I'd like some insight into why the match failed.
On Tuesday, September 30, 2014 3:19:11 PM UTC-4, atomly wrote:
Try this instead, perhaps?
case Event(Success(streamConfig: StreamConfig), req) => {
stay() using StreamConfigRetrieved(streamConfig,
req.session) forMax(timeout)
}
case Event(Success(dockConfig: DockConfig), req) => {
stay() using DockConfigRetrieved(dockConfig, req.session)
forMax(timeout)
}
:: atomly ::
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On Tue, Sep 30, 2014 at 1:20 PM, bearrito <[email protected]>
wrote:
I believe I have a misunderstanding of the way the Events are
matched.
The below code snippet generates the following exception
case Event(streamConfig : Success[StreamConfig],req: Request) => {
stay() using
StreamConfigRetrieved(streamConfig.get,req.session)
forMax(timeout)
}
case Event(dockConfig : Success[DockConfig], req: Request)
=> {
stay() using
DockConfigRetrieved(dockConfig.get,req.session) forMax(timeout)
}
[akka://CityActorSpec/user/$$a]
trafficland.commons.data.flycast.DockConfig cannot be cast to
trafficland.commons.data.flycast.StreamConfig
java.lang.ClassCastException:
trafficland.commons.data.flycast.DockConfig cannot be cast to
trafficland.commons.data.flycast.StreamConfig
I've watched it take place in the debugger. The first event is
matched but the Success(StreamConfig) is actually a
Success(DockConfig)
Can we not match on generic traits?
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