A gear simulation in Scala

Introduction

A simulation of gears using akka (1.0-M1) actors and scala-swing with Scala 2.8.final. To get familiar with the akka actors I forked pmeiclx/scala_gear_simulation and changed the simulation from scala actors to akka actors.

What this branch contains:

• Usage of akka Actors (http://doc.akkasource.org/actors-scala)
• Fault Tolerance Through Supervisor Hierarchies a(k)ka "Let it crash" (http://doc.akkasource.org/fault-tolerance-scala)

How it is achieved:

Usage of akka Actors

• Change from scala.actors.Actor to se.scalablesolutions.akka.actor
• Change type of List / Map and dependencies to ActorRef
• Change loop / react to receive

Fault Tolerance

• Programmatical linking and supervision of Actors
• OneForOne strategy (5 Exception in less than 20 seconds)

Monitoring

• YourKit for thread activity

What is the purpose of...

...the slider colors:

• green: Gear is synced
• yellow: Gear in progress
• red: Gear has been sabotaged
• magenta: Gear had an an exception (new in this branch)
• black: Gear had 5 exceptions within 20 seconds (double click to revive) (new in this branch)