Re: 'Instance' Data for Server-Side Objects

[Sam Couter <sam topic com au>]

Adam Buckley <adambuckley@gmx.net> wrote:
> Hi Gurus,
> 
> How do I set 'instance' data for server-side object instances?

Use the servant struct by adding extra members to it. Look in the top of
the generated implementation skeleton for the struct
impl_POA_<Module>_<Interface> (where Module and Interface are as defined
in your IDL). Add members to it, and you can then use them in your code
(in the server only!).

> Ie, in server.c, I'd like to do something like this:
> 
> 	// Normal creation from echo-skelimpl.c
> 	Echo echoServerObj1 = impl_Echo__create(poa, &env);
> 	Echo echoServerObj2 = impl_Echo__create(poa, &env);
> 
> 	// Can I do this?
> 	echoServerObj1->something->specialNumber = 1;
> 	echoServerObj2->something->specialNumber = 2;

Not quite. You probably need to do something like:

	servant = (MyServantType)
		PortableServer_POA_reference_to_servant(poa, echoServerObj1, &env);
	servant->specialNumber = 1;

> And in the implementation, I'd like to do something like this:
> 
> 	static void impl_Echo_echoString(impl_POA_Echo *servant,
> 		CORBA_char *msg, CORBA_Environment *env)
> 	{
> 		// Can I do this?
> 		int servantNumber = servant->something->specialNumber;
> 
> 		printf("servant %d says: %s\n", servantNumber, msg);
> 		return;
> 	}

You control the type for impl_POA_Echo (or whatever your object is
called in your IDL), so you can define whatever fields on it you like.

> Could anyone demonstrate how to do it?  Or point me to some documentation?
> This is one time when object-orientated programming would come in handy...

You just need to know what methods to use and which objects to use them
on. ;)
-- 
Sam Couter          |   Internet Engineer   |   http://www.topic.com.au/
sam@topic.com.au    |   tSA Consulting      |
OpenPGP key ID:       DE89C75C,  available on key servers
OpenPGP fingerprint:  A46B 9BB5 3148 7BEA 1F05  5BD5 8530 03AE DE89 C75C

PGP signature