Quick example of a payment process done with Akka.

gistfile1.scala

import akka.actor._
import akka.actor.Actor._

case class StartPayment(provider: String)
case class CompletePayment(provider: String) 

case class PaymentProcess(userId: Int) extends Actor {
  var currentProvider: String = _
  def receive = {
    case StartPayment(provider) => {
      currentProvider = provider
      println("Start payment: " + provider)
    }
    case CompletePayment(provider) => {
      if (currentProvider == provider) println("Successfully completed payment with " + provider)
      else println("You're doing it wrong.")
      currentProvider = null
    }
  }
}

val user1PaymentActor = actorOf(new PaymentProcess(1)).start()

user1PaymentActor ! StartPayment("Bank Awesome"); user1PaymentActor ! CompletePayment("Dave's Bank"); user1PaymentActor ! StartPayment("Bank Awesome"); user1PaymentActor ! CompletePayment("Bank Awesome")