Iraklis Blog

Below is my implementation of a Dynamic Service Locator

ServiceLocator.scala

import scala.reflect.runtime.{universe => ru}
trait ServiceLocator {
  def getService[T](implicit t: ru.TypeTag[T]) : T
  def registerService[T](obj: T)(implicit t: ru.TypeTag[T]) : Unit
}

ServiceLocatorImpl.scala

import scala.reflect.runtime.{ universe => ru }
import scala.reflect.runtime.universe.Type

class ServiceLocatorImpl extends ServiceLocator {
  val rep = new scala.collection.mutable.HashMap[reflect.runtime.universe.Type, Any]()

  private def internalServiceSearch(t: Type): Option[Any] = {
    val tpe = t
    for {
      s <- rep.keys
      if (s <:< tpe || s =:= tpe)
    } return Some(rep(s))
    None
  }
  def getService[T](implicit t: ru.TypeTag[T]): T = {
    val res = internalServiceSearch(t.tpe)
    res match{
      case None => throw new Exception("Service not found")
      case _ => res.get.asInstanceOf[T]
    }
  }
  def registerService[T](obj: T)(implicit t: ru.TypeTag[T]): Unit = {
    if (internalServiceSearch((t).tpe) == None) rep.put(t.tpe, obj.asInstanceOf[Any])
  }
}