java - Deregister delegated class -

i have decided use composition extend functionality of several service classes have in project adding security layer prevent calling method. fine until found class registers listener service , see i'll need extend method called in listener. listener registered in init method of class thought 'de-register' delegated class after init method has been called , register instead composited class feel it's bit dirty... know think approach or how solve this.

maybe can have better idea looking @ example of classes have:

public abstract class serviceabs {     protected void init(); }  public interface oldclassif {     public void amethod(); }  public myoldclass extends serviceabs implements oldclassif, listenerif {     protected void init() {         observer.addlistener(this);         //other stuff needed     }      public void onlistener() {     }     @override     public void amethod() {     }  }  public mynewclass extends serviceabs implements oldclassif, listenerif {     myoldclass oldclass;     public void onlistener() {        if(condition) {            oldclass.onlistener();        }     }     protected void init() {         oldclass.init();         observer.removelistener(oldclass);         observer.addlistener(this);     }     public void amethod() {         if(condition) {             oldclass.amethod();         }     } }