Scala example source code file (actor-exceptions.scala)

This example Scala source code file (actor-exceptions.scala) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Scala tags/keywords

a, a, actor, exception, master, myexception, myexception, myotherexception, slave, slave, string, string, test, throwable

The Scala actor-exceptions.scala source code

import scala.actors.{Actor, Exit}
import Actor._

case class MyException(text: String) extends Exception {
  override def fillInStackTrace() = this
}

case class MyOtherException(text: String) extends Exception {
  override def fillInStackTrace() = this
}

object Master extends Actor {
  trapExit = true
  def act() {
    try {
    link(Slave)
    Slave.start()
    for (i <- 0 until 10) Slave ! A
    react {
      case Exit(from, reason) =>
        println("OK")
    }
    } catch {
      case e: Throwable if !e.isInstanceOf[scala.util.control.ControlThrowable] =>
        e.printStackTrace()
    }
  }
}

object Slave extends Actor {
  override def toString = "Slave"
  override def exceptionHandler: PartialFunction[Exception, Unit] = {
    case MyException(text) =>
    case other if !other.isInstanceOf[scala.util.control.ControlThrowable] => super.exceptionHandler(other)
  }
  def act() {
    try {
    var cnt = 0
    loop {
      react {
        case A =>
          cnt += 1
          if (cnt % 2 != 0) throw MyException("problem")
          if (cnt == 10) {
            throw MyOtherException("unhandled")
          }
      }
    }
    } catch {
      case e: Throwable if !e.isInstanceOf[scala.util.control.ControlThrowable] &&
                           !e.isInstanceOf[MyException] &&
                           !e.isInstanceOf[MyOtherException] =>
        e.printStackTrace()
    }
  }
}

case object A

object Test {
  def main(args: Array[String]) {
    Master.start()
  }
}