RE: keep a java program open -- JAVA400-L

I have looked at the CPU usage of the java application that is waiting for a
message on the queue and it looked good (It seemed like it blocked while
waiting, it was not doing polling). Data queues also seemed like the fasted
way to get messages to move between different applications that run on the
same AS/400 machine.

I also feel that this type of solution would scale very well. You can have
multiple java programs or multiple java threads read from the same queue and
only one of them will get a message, that way you can pre-start more jobs or
threads to do the work.

For me it felt as if the communication between to two jobs (CL and Java
process) was almost instantaneous. It also allowed me to make use of
connection pooling for jdbc and AS400 connections which reduced the time to
complete the request even more.

Are there any other ways to move data from java back to a calling RPG / CL
program? I know you can use PCML to call a RPG program from java and you can
have input and output parameters but what can you do if you want to call a
java program from RPG while wanting to have input and output parameters? You
could probably use data areas, MQ Series, Data queues but they all seem to
fall into the same type of solution.

I hope I answered your question, I know I started rambling a bit...

Etienne


-----Original Message-----
From: Fenton, Tim [mailto:Tim_Fenton@hen.invesco.com]
Sent: Tuesday, January 22, 2002 1:43 PM
To: 'java400-l@midrange.com'
Subject: RE: keep a java program open


Just to reiterate that data queues seem to be the key to getting java to
talk to anything on  iSeries. The program sits waiting and behaves pretty
quickly after the painfully slow first time...

-----Original Message-----
From: James H. H. Lampert [mailto:jamesl@hb.quik.com]
Sent: 22 January 2002 14:15
To: java400-l@midrange.com
Subject: Re: keep a java program open


"Richards, Etienne (CAP, PTL)" wrote:
. . .
> What I did was change the Java program to get it's parameters from a data
> queue. The Java program was configured to always run and all it did was
wait
> for data on the data queue.
. . .

I've done similar things with code that front-ended JavaMail, so that
AS/400 host applications could send email through a mail server running
on another machine. (Why the messaging facilities built into OS/400 were
written to *ONLY* send email if the mail server was on the same machine
I don't know.)

--
James H. H. Lampert
Professional Dilettante
http://www.hb.quik.com/jamesl
http://members.hostedscripts.com/antispam.html
http://www.thehungersite.com

Read My Lips: No More Atrocities!
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