Question

After some time this actor fills out stack. Possible solutions ?

object Puller extends Actor {

 def act() = {
  receiveWithin(2000) {
    case Stop => println("stoping puller")
        exit()
    case Noop => println("nothing happens")
        act()
    case TIMEOUT => doPull
        act()
  }
}

  def doPull() = // stuff...
}

I’m unhappy to find this code in Programming in Scala.

Answer 1

Your act is not tail-recursive. You can modify it as follows:

  @tailrec // in the presence of this annotation, the compiler will complain, if the code is not tail-recursive
  def act() = {
    receiveWithin(2000) {
      case Stop => println("stoping puller"); exit()
      case Noop => println("nothing happens")
      case TIMEOUT => doPull
    }
    act()
  }