Spring framework and java like Object collectors In Scala - spring

Question

In Spring framework and Java world, there is an interesting object collector pattern that I use.
For example consider below -
public interface Calculator {
SomeOutput calculate(SomeInput input);
}
#Component
public class CalImpl1 implements Calculator {
public SomeOutput calculate(SomeInput input){
//some implementation
}
}
#Component
public class CalImpl2 implements Calculator {
public SomeOutput calculate(SomeInput input){
//some implementation
}
}
Now this can easily injected in another class using Spring DI
#Component
public class Main {
//This line collects all to implementors of this and set it here.
#Autowired
public List<Calculator> calculators;
//other methods
}
Now problem is I am not sure how same thing can be achieved in scala. I have done some search and found cake pattern (http://loicdescotte.github.io/posts/scala-di/) used in scala but that didn't seem to achieve same thing as object collectors like above. I also want to follow open close principle which I think gets violated in cake pattern but using object collectors I can easily achieve it.
is there a way achieve same object collectors like implementation in scala?

Answer 1

There are templates in lighbend activator that illustration using spring DI on Play, Akka and Scala applications. Please see this: https://www.lightbend.com/activator/templates#filter:spring
I haven't used Spring as DI, I usually use Guice (explicitly used because it's default on play framework 2) and Implicits parameters both as a compilation DI.
Sample:
class B
class X(x: Int)(implicit c: B)
//DI - mostly define in main method/application
implicit val c: B = new B
val x = new X(2)

Answer 2

Explicitly using java.util.List worked for me. This is not the prettiest solution but it shows that it basically works. Haven't tried that but implementing a corresponding PropertyEditor you could stick with the Scala types.
trait Calculator {
def calculate(input: SomeInput) : SomeOutput
}
#Component
class CalImpl1 extends Calculator {
override def calculate(input: SomeInput): SomeOutput = ...
}
#Component
class CalImpl2 extends Calculator {
override def calculate(input: SomeInput): SomeOutput = ...
}
#Component
class Main #Autowired()(calculators: java.util.List[Calculator]) {
// or inject field if constructor injection is not desired
// #Autowired
// var calculators: java.util.List[Calculator] = _
}
object Main {
def main(args: Array[String]) = {
val ctx = new AnnotationConfigApplicationContext("your package name here")
val main = ctx.getBean(classOf[Main])
// calculators should now be wired in the returned instance
}
}