Experimental Physics and
Industrial Control System

"Dalesio, Leo" <[email protected]> · Wed, 8 Jul 2009 13:13:39 -0400

What do you do if the client is not consuming - but the server continues to create arrays?

-----Original Message-----
From: Bruno Coudoin [mailto:[email protected]]
Sent: Wed 7/8/2009 12:06 PM
To: Andrew Johnson
Cc: [email protected]; Dalesio, Leo; Ralph Lange
Subject: Re: Detecting data lost from a subscriber

Le mercredi 08 juillet 2009 à 10:07 -0500, Andrew Johnson a écrit :
> On Wednesday 08 July 2009 09:29:33 Dalesio, Leo wrote:
> >
> I noticed that Bruno's original question mentioned CAS rather than the IOC, 
> and I'm not sure whether he realizes that there is still a major distinction.  
> Both Bob's and Ralph's answers were discussing the IOC server, although I 
> think the same principle applies to the CAS in that the CA protocol itself 
> provides no means for a client to know whether data has been discarded.  It 
> should still be possible to include a count in the data array to detect this 
> at the application level though if desired.

I understand my confusion now. Yes I use the CAS. Also in my
implementation I allocate a new buffer at each update of my array. So
when I postEvent to the CAS it has a gdd pointing  to an array that will
never be overwritten. Thus there is no behavior difference between an
array and a scalar value.

Of course the drawback of my implementation is that I do allocate more
memory. On way I though to improve it was to avoid the allocation in
case there is no subscriber.

Bruno.

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System