Re: problems with remote NameService calls

[Fabien Tassin <fta+orbit sofaraway org>]

According to Fabien Tassin:
> 
> Anyone to help me with that ?

I've identified my problem.

I traced it to ORBit_initial_references_by_user().
When it receives a corbaloc from '-ORBInitRef NameService=' or -ORBNamingIOR,
before calling ORBit_set_initial_reference(), it should check that
"NameService" _is_a() IDL:omg.org/CosNaming/NamingContext".
The answer would have been (in my case) a location forward
to a new Object key. Another _is_a() on that new key would be ok.
Then CosNaming_NamingContext_list() would work as expected.

There's a FIXME in orb-core/corba-orb.c ORBit_initial_references_by_user()
that is related to that. The second call of ORBit_set_initial_reference()
in ORBit_initial_references_by_user() needs the same FIXME.

The loop I'm experiencing is just that. CosNaming_NamingContext_list()
receives the location forward to that new key but does not handle
it properly and loops with the initial key (NameService) instead
of using the new one. IMHO, that's a bug too.

I've just read the implementation of CORBA_Object_is_a() and I'm
not sure that function does what I need, ie send GIOP _is_a() requests
and handle location forwards properly (if any).

Could someone help me from here ?

/Fabien

> According to Fabien Tassin:
> > Date: Mon, 31 May 2004 16:25:21 +0200
> > 
> > Hi,
> > 
> > I have an Orbit2 client talking to a remote non-Orbit server.
> > It works well when used with a (fixed) IOR read with
> > client_import_service_from_stream().
> > I now wish to use the NameService on the remote ORB to get the IOR
> > dynamically.. but it doesn't work.
> > 
> > Here is a minimalistic piece of code.
> > 
> > ==
> >   /* ... */
> >   orb = CORBA_ORB_init(&argc, argv, "orbit-local-orb", ev);
> >   abort_if_exception(ev, "CORBA_ORB_init() failed");
> > 
> >   nameservice = CORBA_ORB_resolve_initial_references(orb, "NameService", ev);
> >   abort_if_exception(ev, "resolve_initial_references(NameService) failed");
> > 
> >   context = (CosNaming_NamingContext) nameservice;
> >   g_assert(!CORBA_Object_is_nil(context, ev));
> > 
> >   CosNaming_NamingContext_list(context, 0, &bl, &bi, ev);
> >   abort_if_exception(ev, "list() failed");
> >   g_assert(!CORBA_Object_is_nil(bi, ev));
> >   /* ... */
> > ==
> > 
> > I invoke this using -ORBInitRef NameService=corbaloc::remote:port/NameService
> > It goes into an infinite loop in CosNaming_NamingContext_list().
> > 
> > ethereal+strace show that the CORBA_ORB_resolve_initial_references() call is
> > not made against the remote ORB but against the local one (from my
> > Gnome2 desktop, reading /tmp/orbit-myuser).
> > CosNaming_NamingContext_list() talks to the remote ORB but loops..
> > [ Request (two-way): list -> Reply: Location Forward ]
> > I assume this is because 'nameservice' is wrong.
> > 
> > I'm quite sure it is a problem with my client code (or Orbit2)
> > as 'nameclt' from omniorb4 works perfectly.
> > (nameclt -ORBInitRef NameService=corbaloc::remote:port/NameService list)
> > 
> > Maybe I missed something or did something wrong..
> > 
> > $ orbit2-config --version
> > ORBit2 2.10.2
> > 
> > Thoughts ?
> > 
> > /Fabien
> > _______________________________________________
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