control instantiation of osgi declarative service

Question

I am looking for a simple way to control the instantiation of a declarative service.

What I want is something like a factory which is asked to return an instance of a component, but where I can control the instantiation.

Currently I just found the ComponentFactory where I just can call newInstance with a given dictionary. But what I really want, is something like this, assuming IComponent is the declarative service interface and MyComponent is the implementation class

public class MyComponentFactory implements ? {

   public IComponent newInstance() {
       return new MyComponent("firstParameter", "secondParameter");
   }
}

Is there something possible like this with declarative services, or do I need to use my own service registration in a bundle activation code?

Thanks in advance

Answer 1

DS does not provide for the level of instance creation indirection you are looking for. DS will always use the public no-args constructor and then call the specified activator method to complete the instance initialization.