public void addListener(SimpleSubjectListener listener) {
publisher.addListener(
SimpleSubjectListener.this, listener, SimpleSubjectListenerEventFormat.INSTANCE);
}
public void addListener(DetachedSubject listener) {
listener.upstreamSubjects.add(this);
Listener innerListener = new Listener(listener);
publisher.setRelatedSubject(innerListener, innerListener.subject);
publisher.addListener(this, innerListener, DetachedSubjectAndListenerEventFormat.INSTANCE);
}