Service Objects with Dialog duration

Question

m
Hi Forte`ans,
I am trying to listen to an event from a service object which has a
dialog duation of Message.The service object is configured for
failover.
I get an exception ( not an error message ) saying :
SYSTEM ERROR: Invalid attempt to register for an event on an object of
class (CKBaseServiceMgrProxy) which has a dialog duration of
message. The
semantics of message duration do not guarantee that the same object
instance will service each message, which is in conflict with the
semantics of event registration (which requires that the same object
instance to which the event is registered for generates the event;
these are two separate actions). To disable this restriction,
restart this process with cfg:do:4 specified.
If I make the dialog duration of the SO Session, it works without
screaming.
Does this mean I cannot listen to events from such SO( Failover
enabled with Message duration?) Is it because the event loop may still
point to the failed SO and Forte wants to avoid such situations???
Can somebody throw some light on this..?
Thanks
Ajith Kallambella M
International Business Corporation.

Answer 1

We ran into this same problem when converting an application from R1 to
R2. In R1, you were allowed to do this. However, Forte won't
guarantee, even in a non-replicated, non-failover partition, that it
won't swap objects under certain situations unless the dialog duration
is session. If this happened, you would lose your registration and not
even know it. The recommended solution is for the client partition to
pass a reference to an object anchored in its partition to the service
object in the remote partition. The service object can then post events
on the anchored object, which is guaranteed to be there during the life
of that client partition. The logger flag was designed for backwards
compatibility. It's not really recommended, but it's not supposed to
have much overhead if you do use it. We already had a client
notification architecture in place, so we re-worked our application to
use it in the cases where we had been using direct registrations. Hope
this helps -- Chris
Chris Kelly, IS Architect
Andersen Windows
From:
[email protected][SMTP:[email protected].
net.in]
Sent: Thursday, September 18, 1997 1:44 PM
To: [email protected]
Subject: Service Objects with Dialog duration
m
Hi Forte`ans,
I am trying to listen to an event from a service object which
has a
dialog duation of Message.The service object is configured for
failover.
I get an exception ( not an error message ) saying :
SYSTEM ERROR: Invalid attempt to register for an event on an
object of
class (CKBaseServiceMgrProxy) which has a dialog duration of
message. The
semantics of message duration do not guarantee that the same
object
instance will service each message, which is in conflict with
the
semantics of event registration (which requires that the same
object
instance to which the event is registered for generates the
event;
these are two separate actions). To disable this restriction,
restart this process with cfg:do:4 specified.
If I make the dialog duration of the SO Session, it works without
screaming.
Does this mean I cannot listen to events from such SO( Failover
enabled with Message duration?) Is it because the event loop may
still
point to the failed SO and Forte wants to avoid such
situations???
Can somebody throw some light on this..?
Thanks
Ajith Kallambella M
International Business Corporation.