scala.actors.remote.RemoteActor.scala Maven / Gradle / Ivy
/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2005-2006, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
// $Id: RemoteActor.scala 9301 2006-11-20 06:05:46Z phaller $
package scala.actors.remote
/**
This object provides methods for creating, registering, and
selecting remotely accessible actors.
A remote actor is typically created like this:
actor {
alive(9010)
register('myName, self)
// behavior
}
It can be accessed by an actor running on a (possibly)
different node by selecting it in the following way:
actor {
// ...
val c = select(TcpNode("127.0.0.1", 9010), 'myName)
c ! msg
// ...
}
@author Philipp Haller
*/
object RemoteActor {
private val kernels = new scala.collection.mutable.HashMap[Actor, NetKernel]
/**
* Makes self remotely accessible on TCP port
* port.
*/
def alive(port: int): Unit = {
val serv = new TcpService(port)
serv.start()
kernels += Actor.self -> serv.kernel
}
/**
* Registers a under name on this
* node.
*/
def register(name: Symbol, a: Actor): Unit = {
val kernel = kernels.get(Actor.self) match {
case None => {
val serv = new TcpService(TcpService.generatePort)
serv.start()
kernels += Actor.self -> serv.kernel
serv.kernel
}
case Some(k) => k
}
kernel.register(name, a)
}
/**
* Returns (a proxy for) the actor registered under
* name on node.
*/
def select(node: Node, sym: Symbol): Actor =
new Actor {
def act(): Unit = {}
override def !(msg: Any): Unit = msg match {
case a: AnyRef => {
// establish remotely accessible
// return path (sender)
val kernel = kernels.get(Actor.self) match {
case None => {
val serv = new TcpService(TcpService.generatePort)
serv.start()
kernels += Actor.self -> serv.kernel
serv.kernel
}
case Some(k) => k
}
kernel.send(node, sym, a)
}
case other =>
error("Cannot send non-AnyRef value remotely.")
}
}
}
/**
* This class represents a machine node on a TCP network.
*
* @author Philipp Haller
*/
case class Node(address: String, port: Int)