Tictactoe web game - Demo for Akka and Xitrum

See slides: Develop realtime web with Scala and Xitrum

Requirement: Java 8+

Development mode

Run:

sbt/sbt fgRun

Open http://localhost:8000/ or https://localhost:4430/

To generate Eclipse project:

sbt/sbt eclipse

Production mode

Package:

sbt/sbt xitrumPackage

Directory target/xitrum will be created:

target/xitrum/
  config/
    akka.conf
    xitrum.conf
  lib/
    <jar files>
  script
    start
    start.bat

Clustering

You can run a cluster of Tictactoe servers. See "Single node" and "Clustering" in Lobby.scala and Player.scala. Use akka.conf to config the cluster.

How this program works

Player matching

• Player actors connect to a lobby actor.
• When there are enough 2 players, the lobby actor let the player actors know about each other.
• The players then send messages directly to one another.

browser1 --- [SockJs] --- player actor1
                              |
                          lobby actor
                              |
browser2 --- [SockJs] --- player actor2

Game playing

browser1 --- [SockJs] --- player actor1
                              |
                              |
                              |
browser2 --- [SockJs] --- player actor2

Exercises

• Instead of letting player actors send messages directly to each other, use an intermediate game actor for each game.
• Let users other than the players watch games.
• Use Scala.js to convert game logic code written in Scala to JavaScript, to share game logic code between server side and client side.
• Use Akka FSM instead of become.