I wish to create an actor that stores an array of elements of some general
type V. The typical way to instantiate such an array is to provide a
ClassTag and default value. I have implemented this as follows:
import akka.actor._
import scala.reflect.ClassTag
class MyActor[V : ClassTag](size: Int, default: V) extends Actor {
// Array of given size filled with given default value
val array = Array.fill[V](size)(default)
override def receive: Receive = {
case i: Int if i < size && i >= 0 => println(i)
}
}
val system = ActorSystem("test")
val myActor = system.actorOf(Props(classOf[MyActor[Double]], 100, 0.0))
// java.lang.IllegalArgumentException: no matching constructor found on
class MyActor for arguments [class java.lang.Integer, class
java.lang.Double]
// at akka.util.Reflect$.error$1(Reflect.scala:81)
// ...
Unfortunately, the above code does not work and I get an exception as soon
as the actor is created. It seems that Akka does not pass the implicit
class tag that is necessary to instantiate the class(?) Note that there is
no problem when using the above pattern in a normal class:
import scala.reflect.ClassTag
class Test[V : ClassTag](size: Int, default: V) {
// Array of given size filled with given default value
val array = Array.fill[V](size)(default)
}
val test = new Test[Double](100, 0.0)
test.array(3)
// Correctly returns 0.0
Any advice on how to get something like this working in Akka?
Thanks!
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