better_actors_bank.scala

import scala.actors._
import Actor._

object Bank extends Actor{
        
  private var accounts = Map("from" -> Account("from", 500), "to" -> Account("to", 500) )
  
  def act = {
    loop{
      react{
        case Transfer(fromNo, toNo, amount) =>
          val (from, to) = (accounts(fromNo), accounts(toNo))
          if(from.balance > amount){
            accounts = accounts + (to.accountNo -> to.copy(balance = (to.balance + amount)))
            accounts = accounts + (from.accountNo -> from.copy(balance = (from.balance - amount)))
          }
      }
    }
  }

}

case class Transfer(fromNo: String, toNo: String, amount: Int)
case class Account(val accountNo: String, balance: Int)