public void handle(short operation,String key,Object data,Node src,Node dst){
  notifications.add(new UserDataNotification(operation,key,data,src,dst));
}

public void handle ( short operation , String key , Object data , Node src , Node dst ) { notifications . add ( new UserDataNotification ( operation , key , data , src , dst ) ) ; }
implementation of userdatahandler . handle . creates a userdatanotification for later testing
