Why is Actor.receive a partial function? I can always have a regular function with match expression instead of it.
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问题:
回答1:
It is a PartialFunction to capture the possibility of a message being handled or unhandled by the Actor. An unhandled message will
- not make the Actor fail with a
MatchError - spawn an
UnhandledMessageevent to the event stream
More info here.
回答2:
One reason would be that the partial function has isDefinedAt method, which allows Akka to check if the message can be handled without catching the scala.MatchError exception from user's code.
