[omniORB] Use of _non_existent

[Wilson Jimmy - jiwils]

> You can have a look at the CORBA spec's at http://www.omg.org/ , the
>_non_existent
>method is described under 4.3.5 Probing for Object Non-Existance. As i
>read it
>the method checks for the existence of an object possibly by means of a
>servant.

The passage you're referring to is the following I think:

"Probing for object non-existence may require contacting the ORB that
implements the target object."

Doesn't that mean that it is talking to the ORB as distinguished from the
application (servant skeleton implementation) code?  The reason I draw that
conclusion is the statement in the first paragraph of the section:

"It does this without invoking any application level operation on the
object, and so will never affect the object itself."

I am reading from version 2.6 of the spec, did slightly older versions
(2.5/2.4) say differently?  Am I drawing the correct conclusion?

Anyone have additional input?

Jimmy
-- 
James "Jimmy" Wilson
Software Developer, Acxiom Corporation

-----Original Message-----
From: bjorn rohde jensen [mailto:shamus@tdcadsl.dk]
Sent: Tuesday, March 12, 2002 11:23 AM
To: omniORB Mailing List (E-mail)
Subject: Re: [omniORB] Use of _non_existent


Hi Jimmy,

 Well, the question is interesting and a bit technical. I would say, you
are doing the right thing using the _non_existent to check an object
reference.
One possible problem is, when there is a one to many mapping of servants
and
objects. In this case you should override the _non_existent method of
the
servant to verify, that it actually incarnates the object. This merely
complicates the code for the servant, but it ought to be done, or the
behavior
of the _non_existent operation would be broken.
 You can have a look at the CORBA spec's at http://www.omg.org/ , the
_non_existent
method is described under 4.3.5 Probing for Object Non-Existance. As i
read it
the method checks for the existence of an object possibly by means of a
servant.
I would say, it is the responsibility of the servant to answer
truthfully:)

yours sincerely,

bjorn


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