Akka/Scala example source code file (AddressUidExtension.scala)

This example Akka source code file (AddressUidExtension.scala) is included in my "Source Code Warehouse" project. The intent of this project is to help you more easily find Akka and Scala source code examples by using tags.

All credit for the original source code belongs to akka.io; I'm just trying to make examples easier to find. (For my Scala work, see my Scala examples and tutorials.)

Akka tags/keywords

actor, actorsystem, addressuidextension, akka, concurrent, extendedactorsystem, extension, extensionid, extensionidprovider, forkjoin, int, remote

The AddressUidExtension.scala Akka example source code

/**
 * Copyright (C) 2009-2014 Typesafe Inc. <http://www.typesafe.com>
 */
package akka.remote

import scala.concurrent.forkjoin.ThreadLocalRandom
import akka.actor.ActorSystem
import akka.actor.ExtendedActorSystem
import akka.actor.Extension
import akka.actor.ExtensionId
import akka.actor.ExtensionIdProvider

/**
 * Extension that holds a uid that is assigned as a random `Int`.
 * The uid is intended to be used together with an [[akka.actor.Address]]
 * to be able to distinguish restarted actor system using the same host
 * and port.
 */
object AddressUidExtension extends ExtensionId[AddressUidExtension] with ExtensionIdProvider {
  override def get(system: ActorSystem): AddressUidExtension = super.get(system)

  override def lookup = AddressUidExtension

  override def createExtension(system: ExtendedActorSystem): AddressUidExtension = new AddressUidExtension(system)
}

class AddressUidExtension(val system: ExtendedActorSystem) extends Extension {
  val addressUid: Int = ThreadLocalRandom.current.nextInt()
}