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package examples.actors
import scala.actors.Reactor
import scala.actors.Actor._
abstract class PingMessage
case class MsgStart() extends PingMessage
case class MsgPingInit(count: int, pong: Pong) extends PingMessage
case class MsgSendPing extends PingMessage
case class MsgPong(sender: Pong) extends PingMessage
abstract class PongMessage
case class MsgPing(sender: Ping) extends PongMessage
case class MsgStop() extends PongMessage
object PingPong {
def main(args : Array[String]): Unit = {
val ping = new Ping
ping.start
val pong = new Pong
pong.start
ping ! MsgPingInit(100000, pong)
ping ! MsgStart
}
}
class Ping extends Reactor {
def act(): unit = {
loop(0, null)
}
def loop(pingsLeft: int, pong: Pong): unit = {
react {
case MsgPingInit(count, pong) => {
System.out.println("Ping: Initializing with count:"+count+":"+pong)
loop(count, pong)
}
case MsgStart() => {
System.out.println("Ping: starting.")
pong ! MsgPing(this)
loop(pingsLeft-1, pong)
}
case MsgSendPing() => {
pong ! MsgPing(this)
loop(pingsLeft-1, pong)
}
case MsgPong(pidS) => {
if (pingsLeft % 100 == 0) {
System.out.println("Ping: pong from: "+pidS)
}
if (pingsLeft > 0)
this ! MsgSendPing()
else {
System.out.println("Ping: Stop.")
pong ! MsgStop()
}
loop(pingsLeft, pong)
}
}
}
}
class Pong extends Reactor {
def act(): unit = {
loop(0)
}
def loop(pongCount: int): unit = {
react {
case MsgPing(pidPing) => {
if (pongCount % 100 == 0) {
System.out.println("Pong: ping:"+pongCount+" from: "+pidPing)
}
pidPing ! MsgPong(this)
loop(pongCount+1)
}
case MsgStop() => {
System.out.println("Pong: Stop.")
System.exit(0)
}
}
}
}
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