Re: Callable statement with RPG

[Dieter.Bender@xxxxxxxxxxx (Dieter Bender)]

Am Montag, 18. März 2002 17:22 schrieben Sie:
> >> Wouldn't one or two nasty bugs be a sufficient teacher?
> >
> >One or two nasty bugs ... did you ever have problems with deadlocks in
> >multithreaded applications???
>
> Maybe that's my problem.  I've been a developer of system programming for
> nearly 30 years, including the original single level store paging code.
> Needless to say, I have significant experience with such bugs both at the
> system and application level.

It was no recommendation for people like you, it was for rpg programmers
having no experience on multithreading.

>
> Perhaps your suggestions are practical for your environment, but it seems
> very draconian to me.  Java's synchronization is itself pretty draconian
> (and therefore simplified compared to what I deal with), which is why your
> responses surprise me.  It's not like we're dealing with shared reads and
> all.  Most bugs would be "I forgot to put 'synchronized' here," which ought
> to be easy to spot in code inspections or even DOS FIND commands on your
> code tree (looking for both "native" and "synchronized").  Not to mention
> that it is hardly a requirement for Java code to be multi-threaded to start
> with, though it may be prudent to make some allowance for it later on, I
> suppose.

Many people are starting with servlets and they will run multithreaded by
default.

>
> I haven't measured the performance here, but I would expect that a solution
> like stored procedures (at least when there's no real data base operation
> involved) could be done faster with data queues or sockets.  I don't
> remember you mentioning that (perhaps you did).  That solution, too, would
> alleviate concerns about synchronization.

I recommended sql as a middleware, because JDBC synchronizes on the
connection automatically.
>
>
> Larry W. Loen  -   Senior Linux, Java, and iSeries Performance Analyst
>                           Dept HP4, Rochester MN
>
>
> _______________________________________________
> This is the Java Programming on and around the iSeries / AS400 (JAVA400-L)
> mailing list To post a message email: JAVA400-L@midrange.com
> To subscribe, unsubscribe, or change list options,
> visit: http://lists.midrange.com/cgi-bin/listinfo/java400-l
> or email: JAVA400-L-request@midrange.com
> Before posting, please take a moment to review the archives
> at http://archive.midrange.com/java400-l.

--
mfG

Dieter Bender


DV-Beratung Dieter Bender
Wetzlarerstr. 25
35435 Wettenberg
Tel. +49 641 9805855
Fax +49 641 9805856
www.bender-dv.de