Hi Ben, Dirk,
On 09/25/2017 10:32 AM, Benjamin Franksen wrote:
> On 09/01/2017 04:07 PM, Dirk Zimoch wrote:
>> We have already started thinking about a different CA connection model.
>> Since the archiver is a well known client, it should be possible to
>> initiate the CA connection from the IOC to the archiver instead of the
>> other way round. This would not require any broadcasts and remove the
>> need for an archiver configuration file with an up-to-date record list.
>> But it would need some programming effort.
>
> Interesting idea. Does pvAccess support such a model?
Not directly, but there is nothing stopping you from running a local
archiver client in your IOC and pushing the data it collects to an
archive server over something like a pvAccess ChannelRPC or even just
doing puts to an "archive-me" channel. The local archiver client could
connect to the IOC over any protocol so the IOC doesn't have to run a
pvAccess server for this to work.
Making changes to CA (i.e. to all of libCa, rsrv, pcas and jca/caj) to
enable push subscriptions doesn't sound like it would be particularly
easy to do. The current core developers would generally prefer to
concentrate on continuing to develop pvAccess, which is already a lot
more flexible without having to modify it.
- Andrew
--
Arguing for surveillance because you have nothing to hide is no
different than making the claim, "I don't care about freedom of
speech because I have nothing to say." -- Edward Snowdon
- References:
- Archiver: Problems with disconnected PVs Gabriel de Souza Fedel
- Re: Archiver: Problems with disconnected PVs Dirk Zimoch
- Re: Archiver: Problems with disconnected PVs Benjamin Franksen
- Navigate by Date:
- Prev:
Re: Coordinated motion with EPICS motor record So, Sung-Leung
- Next:
RE: Coordinated motion with EPICS motor record Mark Rivers
- Index:
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
<2017>
2018
2019
2020
2021
2022
2023
2024
- Navigate by Thread:
- Prev:
Re: Archiver: Problems with disconnected PVs Benjamin Franksen
- Next:
Re: Archiver: Problems with disconnected PVs Michael Davidsaver
- Index:
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
<2017>
2018
2019
2020
2021
2022
2023
2024
|