Add to java.
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Bruce Momjian
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@ -965,3 +965,139 @@ TIP 5: Have you checked our extensive FAQ?
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From pgsql-general-owner+M18147=candle.pha.pa.us=pgman@postgresql.org Mon Dec 3 13:53:24 2001
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Message-ID: <3C074DE4.9040905@freemail.hu>
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Date: Fri, 30 Nov 2001 10:14:12 +0100
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From: Laszlo Hornyak <hornyakl@freemail.hu>
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Reply-To: hornyakl@users.sourceforge.net
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To: pgsql-general@postgresql.org
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Subject: [GENERAL] java stored procedures
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Sender: pgsql-general-owner@postgresql.org
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Status: OR
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Hi!
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A few months ago I asked if anyone started working on PL/JAVA, the
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ansver was no. Now I started to write a java stored procedure language
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and environment for PostgreSQL. Some code is already working, and it is
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geting interresting. So, I would like to ask you to write me your ideas,
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suggestions, etc for this environment.
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The source code will be available under GPL when it is worth for
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distributing it (this will take for a while).
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thanks.
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Laszlo Hornyak
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TIP 4: Don't 'kill -9' the postmaster
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From pgsql-general-owner+M18182=candle.pha.pa.us=pgman@postgresql.org Tue Dec 4 13:14:09 2001
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To: Barry Lind <barry@xythos.com>
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cc: Laszlo Hornyak <hornyakl@freemail.hu>, pgsql-general@postgresql.org,
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pgsql-jdbc@postgresql.org
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Subject: Re: [GENERAL] java stored procedures
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References: <3C074DE4.9040905@freemail.hu> <3C0BE325.3020809@xythos.com>
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<3C0C937E.9000405@freemail.hu> <3C0CFD82.1030600@xythos.com>
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From: Doug McNaught <doug@wireboard.com>
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Date: 04 Dec 2001 12:58:47 -0500
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In-Reply-To: Barry Lind's message of "Tue, 04 Dec 2001 08:44:50 -0800"
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Status: OR
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Barry Lind <barry@xythos.com> writes:
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> Having one jvm that all the postgres backend processes communicate with makes
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> the whole feature much more complicated, but is necessary in my opinion.
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Agreed. Also, the JVM is a multithreaded app, and running it inside a
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non-threaded program (the backend) might cause problems.
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> Then the question becomes how does the jvm process interact with the database
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> since they are two different processes. You will need some sort of
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> interprocess communication between the two to execute sql statements. This
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> could be accomplished by using the existing jdbc driver. But the bigest
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> problem here is getting the transaction semantics right. How does a sql
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> statement being run by a java stored procedure get access to the same
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> connection/transaction as the original client? What you don't want happening
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> is that sql issued in a stored java procedure executes in a different
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> transaction as the caller, what would rollback of the stored function call
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> mean in that case?
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I think you would have to to expose the SPI layer to Java running in a
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separate process, either using an RMI server written in C or a custom
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protocol over a TCP socket (Java of course can't do Unix sockets).
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This raises some thorny issues of authentication and security but I
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don't think they're insurmountable. You could, for example, create a
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cryptographically strong "cookie" in the backend when a Java function
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is called. The cookie would be passed to the Java function when it
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gets invoked, and then must be passed back to the SPI layer in order
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for the latter to accept the call. A bit clunky but should be safe as
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far as I can see.
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The cookie would be needed anyhow, I think, in order for the SPI layer
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to be able to find the transaction that the Java function was
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originally invoked in.
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You could make the SPI layer stuff look like a normal JDBC driver to
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user code--PL/Perl does this kind of thing with the Perl DBI
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interface.
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-Doug
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--
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Let us cross over the river, and rest under the shade of the trees.
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--T. J. Jackson, 1863
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