Alternative to try-catch in Scala

I just saw such a nice control abstraction in Scala, that I wanted to share it. The original idea comes from akka-samples, I just modified it slightly to be more generic.

	connected {
	doSomethingDangerous()
	} otherwise {
	println("Error! Got disconnected.")
	}
	def doSomethingDangerous() = {/*...*/}
	def connected(body: => Unit): Result =
	try {
	body; Ok
	} catch {
	case e: ClosedChannelException => Failed
	}
	trait Result { def otherwise(onError: => Unit): Unit}
	case object Ok extends Result { def otherwise(onError: => Unit) = () /* do nothing */}
	case object Failed extends Result { def otherwise(onError: => Unit) = onError}

view raw gistfile1.scala hosted with ❤ by GitHub

In this example the otherwise block gets executed only if system throws ClosedChannelExeption, but I could easily imagine other control abstractions hiding different exception types.