=====================================================
  c accepted
  =====================================================

tcpxfact_session_accepted (i_sessionlistener* thisx, etch_socket* socket)

  ETCH_RESXKEY_SOCKET
  delivery_service = new_etch_transport_a (url, resources);
  
  params->server_stub = HELPER.new_helper_accepted_server (etch_server_factory* p)

      perf_remote_client* client = new_remote_client (0, ds, vf);
        
      i_perf_server* iserver = p->main_new_server (p);
          perf_remote_client* client  = (perf_remote_client*) p->client;
          perf_server_impl* newserver = new_perf_server_impl (client);
          return newserver->perf_server_base;
        
      perf_server_stub* stub = new_perf_server_stub (p); 
        
          stub->destroy   = destroy_stub_object;    /* private */
          stub->destroyex = destroy_my_server_stub; /* public */
            
          stub->stub_base = new_stub (implobj, stubtype, ids, qp, fp);
             stubbase->ds->mbm->set_session (ds, stubbase->isessionmsg);   
             stubbase->impl_callbacks = etchstub_get_session_callbacks_from (implobj); 
            
          stub->stub_base->stubobj = (objmask*) newstub;
          stub->stub_base->params  = params;
          set stub helper run procedures for each message type.
            
  // delivery.itm is mailbox manager. its transport_control was overriden to 
  // tcpdelsvc_transport_control in tcpdelsvc_init().
  // this in turn calls tcpds->transport->transport_control() 
  // delivery.transport is the mailbox manager. 
  
  delivery_service->itm->transport_control (CONTROL_START);  
  
  
  =====================================================
  java accepted
  =====================================================
  
  TcpListener.onSessionAccepted(socket)
   
     resources.add(socket);        
     DeliveryService = newTransport();
     
     
		new TcpConnection();
		    TcpConnection implements TransportData
		           send(buffer);
		           C-NOTE: OK, etch_tcp_connection.its is i_transportdata, etch_tcpconx_transport_data does the send()
		           C-QUESTION: etch_tcp_connection.transport_control etc. where are they assigned? should they be same as itd?
		        implements Transport 
		           TransportQuery(START, STOP, etc),
		           TransportControl (START, STOP, etc)
		    TcpConnection HOSTS SessionData as session.    
		        NOTE: SessionData (including sessionData()), is null until set by inheritor (Packetizer).
		        this.session.sessionData(buffer) is invoked by this.fireData(buffer);
		
		new Packetizer(TcpConnection(transport));
		   (NOTE: Packetizer.transport IS-A TransportData, but Packetizer IMPLEMENTS TransportPacket);
		   
		    this.transport = TcpConnection.TransportData;  
		        C-NOTE: HERE'S HOW:
		            C-NOTE: TcpConnection's TransportData interface is passed to Packetizer's ctor
		            C-NOTE THIS AND ALL SUBSEQUENT: it is only necessary to replace each method if we do not destroy
		                and replace the transport object. otherwise we would destroy existing transport object, 
		                and simply replace that with the transport object passed in the ctor.
		            Packetizer.transport.transportData    = TcpConnection.TransportData;    
                    Packetizer.transport.transportControl = TcpConnection.transportControl; ETC. ETC. query and notify
                    Packetizer.transportPacket has new logic, and then calls Packetizer.transport.transportData().
                    Packetizer.transportControl, Notify, and Query, call Packetizer.transport.transportControl, Query, Notify.
                    		            
		    Tcpconnection.setSession(this);
		        C-NOTE: HERE'S HOW: TcpConnection HOSTS SessionData
		        TcpConnection.sessionData    = Packetizer.sessionData;    C-NOTE: does tcpconx even have a session_data()?
		        TcpConnection.sessionControl = Packetizer.sessionControl; ETC. ETC. query and notify
		
		
		new Messagizer(Packetizer(TransportPacket));
		   (NOTE: Messagizer.transport IS-A TransportPacket, but Messagizer IMPLEMENTS TransportMessage);
	    
		    this.transport = Packetizer.TransportPacket
		        C-NOTE: HERE'S HOW:
		            C-NOTE: Packetizer's TransportPacket interface is passed to Messagizer's ctor
		            Messagizer.transport.transportPacket  = Packetizer.transportPacket;  
		            Messagizer.transport.transportControl = Packetizer.transportControl; ETC. ETC.
		    
		    Packetizer.setSession(this);
		        C-NOTE: HERE'S HOW: Packetizer IMPLEMENTS SessionData  but HOSTS SessionPacket. Messagizer IMPLEMENTS SessionPacket
		        Packetizer.session.sessionPacket  = Messagizer.sessionPacket;
		        Packetizer.session.sessionControl = Messagizer.sessionControl; ETC. ETC.
			
			
		new PlainMailboxManager(Messagizer(transport));	
		    (NOTE: MailboxManager.transport IS-A TransportMessage, AND MailboxManager EXTENDS TransportMessage);
		    
            this.transport = Messagizer.TransportMessage;
            C-NOTE: HERE'S HOW: C-NOTE: Messagizer's i_transportmessage is passed in MailboxManager ctor
            MailboxManager.transport.TransportMessage = Messagizer.TransportMessage
            MailboxManager.transport.TransportControl = Messagizer.TransportControl; ETC. ETC.
            
		    Messagizer.setSession(this);
                C-NOTE: HERE'S HOW: Messagizer IMPLEMENTS SessionPacket  but HOSTS SessionMessage. MailboxManager EXTENDS SessionMessage
			    Messagizer.session.sessionMessage = MailboxManager.sessionMessage;
			    Messagizer.session.sessionControl = MailboxManager.sessionControl; ETC. ETC.
			
			
		new DefaultDeliveryService(MailboxManager(transport));
		    NOTE: DeliveryService transport IS-A MBM IS-A TransportMessage, AND DeliveryService EXTENDS TransportMessage
		
            this.transport = MailboxManager ;
                C-NOTE: HERE'S HOW:
                delsvc->transport = mboxmgr->imanager; OR: THE FOLLOWING
                delsvc->transport->transportMessage = mboxmgr->transportMessage; ETC ETC ETC
                
		    MailboxManager.setSession(this);
                C-NOTE: HERE'S HOW: MailboxManager EXTENDS SessionMessage  AND HOSTS SessionMessage. DeliveryService EXTENDS SessionMessage
                MailboxManager.session.sessionMessage = delsvc->sessionMessage; ETC ETC ETC