hi guys
i have a pattern design problem

every time i use a liberaries (osc5, Serial, Arduino, GSVideo. etc..)
i am forced to declare an instance in main PApplet for costructor of libraries and handle callbacks there.

this is ok for little test from sketches. ok, but
when i am in eclipse for a big project i need more flexibility.
i make a component based classes that - for example - poll serials and use a lot of delegation or bad use of singleton-like stuffs to forward the callback i recive in PApplet.

when it will need only something like:

Code:

class MyApp extends PApplet {
   ...
   mySerialComponent = new SerialComponent()
   ...
}

class SerialComponent implements ISerialEvent{
   ...
   private Serial device = new Serial(this);
   ...
   public serialEvent() { ...handle event... }
}

class Serial {
   Serial(ISerialEvent parent) {
      //constructor
      this.parent = parent
   }
   ... //ohu, there is a new event!
   ...parent.serialEvent()
   ...//is what it really happend inside processing.org framework
}

interface ISerialEvent{
   public SerialEvent()
} 

adding a simple interface would be simpler and clean when design application in OOP mood, isn't it?

ok this is my dream.. bytheway
which is the cleaner way without external interface?