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+From pgsql-hackers-owner+M16317=candle.pha.pa.us=pgman@postgresql.org Thu Dec 6 10:11:27 2001
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+Message-ID: <3C0E77F0.5030904@freemail.hu>
+Date: Wed, 05 Dec 2001 20:39:28 +0100
+From: Laszlo Hornyak <hornyakl@freemail.hu>
+Reply-To: hornyakl@users.sourceforge.net
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+To: Barry Lind <barry@xythos.com>, pgsql-hackers@postgresql.org,
+ pgsql-jdbc@postgresql.org
+Subject: Re: [HACKERS] [GENERAL] java stored procedures
+References: <3C074DE4.9040905@freemail.hu> <3C0BE325.3020809@xythos.com> <3C0C937E.9000405@freemail.hu> <3C0CFD82.1030600@xythos.com> <3C0D219C.1090804@freemail.hu> <3C0D799D.4010808@xythos.com> <3C0DE382.1050400@freemail.hu> <3C0E5A23.7060701@xythos.com>
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+Status: OR
+
+Barry Lind wrote:
+
+>
+> I also stopped cc'ing the general list, since this is getting too
+> detailed for most of the members on that list.
+
+Ok.
+
+> Now to your mail:
+>
+> This seems like a reasonable approach and should work across different
+> JVMs. It would probably be a good experiment to try this with the Sun
+> or IBM jvm at some point to verify. What I was afraid of was that you
+> were hacking the Kaffe code to perform the integration which would
+> limit this solution to only using Kaffe.
+
+I am sure they wont work the same way. I think I have a sun jdk 1.3.0-2,
+so I will try to port it soon. The IBM implementation must wait I think
+until january.
+
+>
+> Just a suggestion: PL/J might be a good name, since as you probably
+> know it can't be called pl/java because of the trademark restrictions
+> on the word 'java'.
+
+Ok, you won, I do not read the licenses. From now it`s name is pl/j.
+Isn`t 'j' too short for the name of the process that runns java? :)
+
+>
+> I am a little concerned about the stability and complexity of having
+> this '-pizza' program be responsible for handling the calls on the
+> java side. My concern is that this will need to be a multithreaded
+> program since multiple backends will concurrently be needing to
+> interact with multiple java threads through this one program. It
+> might be simpler if each postgres process directly communicated to a
+> java thread via a tcpip socket. Then the "-pizza" program would only
+> need to be responsible for starting up the jvm and creating java
+> threads and sockets for a postgres process (it would perform a similar
+> role to postmaster for postgres client connections).
+
+With good design we can solve stability problems. As much as I know, if
+postmaster dies, the postgres server becomes unavailable, this looks the
+same problem. I do not know if we realy need sockets. Anyway, if 'j'
+dies, we can create a new one, and restart calculations. Some watchdog
+functionality...
+Doing thing with sockets need a lot of rework. It is the best time for
+this, while there is not too much thing done.
+
+>>>
+>>>> -when java thread receives the signal, it reads the message(s) from
+>>>> the queue, and starts some actions. When done it tells postgres
+>>>> with a signal that it is ready, and it can come for its results.
+>>>> This will be rewritten see below problems.
+>>>
+>>> Are signals the best way to accomplish this?
+>>
+>> I don`t know if it is the best, it is the only way I know :)
+>> Do you know any other ways?
+>>
+> I don't know, but hopefully someone on the hackers list will chip in
+> here with a comment.
+
+After a first developement cycle (if my brain doesn`t burn down), the
+signals can be replaced to a plugable communication interface I think.
+So maybe we can use CORBA, or sockets, or something else. This will take
+a lot of time.
+
+> OK, so the same backend process that called the function gets messaged
+> to process the sql. This should work. However it means you will need
+> a special version of the jdbc driver that uses this shm+signals
+> communication mechanism instead of what the current jdbc driver does.
+> This is something I would be happy to help you with.
+
+
+This is kind of you. :)
+For this, I will have to finish the protocol of communication. I have to
+learn Postgres enough, so I am not sure this will be done this weekend.
+I have ideas, only time is needed to implement them or to recognize the
+failures.
+
+Thanks,
+Laszlo Hornyak
+
+
+
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+From pgsql-hackers-owner+M16313=candle.pha.pa.us=pgman@postgresql.org Thu Dec 6 10:01:29 2001
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+Date: Thu, 06 Dec 2001 15:23:39 +0100
+From: Laszlo Hornyak <hornyakl@freemail.hu>
+Reply-To: hornyakl@users.sourceforge.net
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+To: Gunnar =?ISO-8859-1?Q?R=F8nning?= <gunnar@polygnosis.com>
+cc: Barry Lind <barry@xythos.com>, pgsql-hackers@postgresql.org,
+ pgsql-jdbc@postgresql.org
+Subject: Re: [HACKERS] [GENERAL] java stored procedures
+References: <3C074DE4.9040905@freemail.hu> <3C0BE325.3020809@xythos.com> <3C0C937E.9000405@freemail.hu> <3C0CFD82.1030600@xythos.com> <m2zo4wttp1.fsf@smaug.polygnosis.com>
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+Status: OR
+
+Hi!
+
+Sorry, I have time only for short ansvers, it is company time :((.
+
+Gunnar Rønning wrote:
+
+>* Barry Lind <barry@xythos.com> wrote:
+>|
+>| possible problems with your strategy). Without knowing what exactly
+>| you are thinking of doing it is difficult to comment.
+>
+>Agreed.
+>
+Ok, I will try to bring the code here before Monday, or at least some
+pieces. It is full of hardcoded constants from my developement
+environment. :(
+
+
+>
+>| I am very interested in hearing what your plans are for pl/java. I
+>| think this is a very difficult project, but one that would be very
+>| useful and welcome.
+>
+>I would very much like to hear about the plans myself.
+>
+I do not see so big difficulities yet, am I so lame? It won`t be easy,
+realy, we should keep it simple, at least becouse of me.
+
+
+thanks,
+Laszlo Hornyak
+
+
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+From pgsql-hackers-owner+M16334=candle.pha.pa.us=pgman@postgresql.org Thu Dec 6 16:11:23 2001
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+ Thu, 6 Dec 2001 15:59:55 -0500 (EST)
+ (envelope-from hannu@tm.ee)
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+Date: Thu, 06 Dec 2001 23:02:51 +0500
+From: Hannu Krosing <hannu@tm.ee>
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+To: hornyakl@users.sourceforge.net
+cc: Gunnar =?ISO-8859-1?Q?R=F8nning?= <gunnar@polygnosis.com>,
+ Barry Lind
+ <barry@xythos.com>, pgsql-hackers@postgresql.org,
+ pgsql-jdbc@postgresql.org
+Subject: Re: [HACKERS] [GENERAL] java stored procedures
+References: <3C074DE4.9040905@freemail.hu> <3C0BE325.3020809@xythos.com> <3C0C937E.9000405@freemail.hu> <3C0CFD82.1030600@xythos.com> <m2zo4wttp1.fsf@smaug.polygnosis.com> <3C0F7F6B.2060605@freemail.hu>
+Content-Type: text/plain; charset=us-ascii; format=flowed
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+Precedence: bulk
+Sender: pgsql-hackers-owner@postgresql.org
+Status: OR
+
+Laszlo Hornyak wrote:
+
+>>
+>> | I am very interested in hearing what your plans are for pl/java. I
+>> | think this is a very difficult project, but one that would be very
+>> | useful and welcome.
+>>
+>> I would very much like to hear about the plans myself.
+>
+> I do not see so big difficulities yet, am I so lame? It won`t be easy,
+> realy, we should keep it simple, at least becouse of me.
+
+Let me propose a very different approach to PL/J - use gcc-java and
+figure out the problems
+with (dynamic) compiling and dynamic linking.
+
+This is an approach somewhat similar to .NET/C# that you first compile
+things and then run instead
+of trying to do both at the same time ;)
+
+Oracle /may/ be doing something similar with their java stored
+procedures, as they claim these to be "compiled".
+
+-----------------
+Hannu
+
+
+
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