[omniORB] Orbix's registerIOCallback feature

[Peter Bauer]

Hello,

when porting some Orbix-stuff to omniORB, one may encounter =

several problems. :-=3D)

One of them is the CORBA(Orbix).registerIOCallback-feature:
Orbix maintains for each Addressspace (ASP) <-> ASP connection
one TCP-Connection, which can be identified in the local =

process by its int filedescriptor (fd). Applications can
register for open and close of such fd's, therefore being
able to monitor startup and shutdown of remote ASP's (or, =

more precise, the connect and disconnect of remote ASP's to
the local ASP). On the other hand, you can query an orbix-
proxy for its fd, an therefore, you are able to do some =

housekeeping on objects of an remote ASP by monitoring
the closeage of it's fd (For example, you may have opened
a database-session on behalf of a remote ASP and want to
throw away that session again if that ASP dies (=3D=3Ddisconnects)
without the needs for implementing some alive-check mechanism).

So, my question is: is there a mechanism available in omniORB, =

which yields the same functionality? Currently, I think no, but
with the following changes, maybe:
In omniORB, the connection between ASP's are shutdown and
reopenend as they are needed, but this feature can be disabled
by setting idleConnectionScanPeriod to infinite (Would this =

affect omniORB::callTimeOutPeriod? Dont hope so). =

Then, each time a connection is started or shutdown, one
could call a user-callback. But for my opinion, the parameter
passed to the user callback should not be the socket-fd, but
the rope or rope-id, because one Rope can have more than one
Socket-connection (theoretically). When is a Rope deleted?
When the last connection to the remote ASP is broken? When
this is true, a Rope-Id would be the perfect replacement for
the fd (the Rope-Pointer would not, because the pointer could
be allocated for another Rope to annother ASP), and the Rope =

constructor and destructor would be the place to put in the
invocation of the user-callback.

Could somebody please comment on that???

Gruss Peter Bauer