Slides from my lightning talk on writing a real time, two player implementation of Tic Tac Toe in Scala and Lift. The source code can be found on http://github.com/erlendfh/lift-tictactoe

1. Lift
The simply functional web framework

2. Scala
• Kjører på JVM’en (og CLR)
• Sterkt typet
• Typeinferens
• Hybrid mellom funksjonelt og objektorientert

3. Lift
• Skrevet i Scala
• Forsøk på (nok en gang) å plukke de beste
aspektene av konkurrerende rammeverk
• Komponent-orientert (a’la Wicket, Tapestry)
• View-first

4. Tic Tac Toe

5. Tic Tac Toe
Server Client
O
TicTacToeClient
X
TicTacToeServer
TicTacToeClient
O
X

6. Actors
• Basert på Erlangs Actor model
• Abstraksjon av tråder
• Meldingsbasert
• Thread pool

7. object PingPong extends Application {
var count = 0;
val pong = actor {
loop {
react {
case Ping => println("Actor Pong Received Ping")
sender ! Pong
case Stop => println("Stopping Pong")
exit()
}
}
}
val ping = actor {
pong ! Ping
loop {
react {
case Pong => println("Actor Ping Received Pong")
count = count + 1;
if (count < 3) {
sender ! Ping
} else {
sender ! Stop println("Stopping Ping")
exit()
}
}
}
}
}
case object Ping
case object Pong
case object Stop

8. DEMO!