What does this mean ?

Hi, I'm currently Learning Scala and more precisely, concurrent programming 
with scala.

I found this code :

class Pong extends Actor {
  def act() {
    var pongCount = 0
    while (true) {
      receive {
        case Ping =>
          if (pongCount % 1000 == 0)
            Console.println("Pong: ping "+pongCount)
          sender ! Pong
          pongCount = pongCount + 1
        case Stop =>
          Console.println("Pong: stop")
          exit()
      }
    }
  }
}

This is from a tutorial, so i'm expecting it to work, the only problem is I 
do not understand how.

The main problem is, how does this code use the case keyword since there is 
no match !
(adress of the tutorial : http://www.scala-lang.org/old/node/242)

Anyway, i understood what was the tutorial was supposed to do (with ping 
pong), I just don't understand what is written, I'd like to be able to 
write it myself.
But it seems i'm missing some syntax subtleties 
And even if these are deprecated, i found the same synthax with the akka 
Library ! So I'm asking myself how to read this.

Anyone can help ? Thanks in advance !

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