Self Reference Example

SelfReferenceExample.scala

// continued the original example from
// https://scalerablog.wordpress.com/2015/07/13/traditionally-baked-scala-cake/

import scala.util.Random

trait MyComponent {
   
  def service: MyService
 
  trait MyService {

    def saySomething:String

  }
}


trait MyRepository {
   
  def getRandomExpression(length:Int = 10): String = Random.nextString(length)
   
}


class MyComponentImpl extends MyComponent{
   
  self: MyRepository => 
  // note `self` can be other names, e.g. `selfies`
   
  def service = new MyServiceImpl
 
  class MyServiceImpl extends MyService {
 
    def saySomething: String = MyComponentImpl.this.getRandomExpression()

  }
   
}

object Main extends App {

  val system = new MyComponentImpl with MyRepository
     
  println(system.service.saySomething)

}