From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: 2dsa | !2dsa ?
Date: Wed, 23 Dec 2020 09:44:26 +0100 [thread overview]
Message-ID: <rrv01a$ioe$1@gioia.aioe.org> (raw)
In-Reply-To: rru6nm$76t$1@franka.jacob-sparre.dk
On 2020-12-23 02:32, Randy Brukardt wrote:
> "Rod Kay" <rodakay5@gmail.com> wrote in message
> news:d3f3b7fb-e051-428b-a947-32310a64933en@googlegroups.com...
>> Hello all,
>>
>> I've heard that the Distributed Systems Annex (DSA) may be dropped from
>> the Ada standard soon. Can anyone confirm this ?
>
> Annex E remains in the proposed Ada 202x standard.
>
> Compiler support, of course, is up to vendors. Dunno if anyone is still
> supporting it.
It should be moved to the user level. As specified in the Annex there
seems no obvious way to provide a user-defined transport for DSA, and
there seems no way to have different implementations of DSA in the same
program.
>> I've been using the Polyorb implementation of DSA for some time and
>> find
>> it very useful. The way in which it abstracts away socket 'plumbing'
>> details makes
>> for very simple/understandable comms.
Yes, but too simple to be universally useful.
> That was the promise, not sure it ever really was realized. Since the Annex
> was weakened enough that third-party support isn't really possible anymore
> (necessary to allow it to be used with current middleware), it's really a
> vendor-specific thing these days.
Yes, I always wished to include DSA support based on various
communication protocols I have implemented in Ada, rather than plain
sockets. E.g. I have a ready-to-go DSA implementation for interprocess
communication over shared memory, but no idea how to make GNAT aware of
it. Or AQMP and ASN.1 look like a straightforward candidate as a DSA
transport as they have detailed type description systems to map Ada objects.
--
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de
next prev parent reply other threads:[~2020-12-23 8:44 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-22 20:00 2dsa | !2dsa ? Rod Kay
2020-12-23 1:32 ` Randy Brukardt
2020-12-23 8:44 ` Dmitry A. Kazakov [this message]
2020-12-24 12:02 ` Maxim Reznik
2020-12-24 13:30 ` Dmitry A. Kazakov
2020-12-27 19:30 ` Rod Kay
2020-12-27 19:34 ` Rod Kay
2020-12-28 23:41 ` Randy Brukardt
2020-12-29 14:56 ` Dmitry A. Kazakov
2020-12-29 15:14 ` Luke A. Guest
2020-12-29 15:51 ` Dmitry A. Kazakov
2020-12-31 23:43 ` Randy Brukardt
2021-01-09 15:05 ` Rod Kay
2021-01-11 14:59 ` Shark8
2021-01-11 15:32 ` Dmitry A. Kazakov
2021-01-11 20:35 ` Shark8
2021-01-11 21:46 ` Dmitry A. Kazakov
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