Re: Differences between calling Java from Qshell and RPG?

Hi,
just a comment on sending a .pdf file via rpg and MQ.
It is possible and quite straight forward:
c* Get stream file size
c exsr GetStmfSiz
c* Create a user space
c exsr CrtUsrSpc
c* Copy the stream file to User Space
c exsr CopyToSpc
c* Put the file (user space) to MQ
c Eval Bufptr = p_data
c Eval Buflen = st_size
c exsr Rspond
Thanks to Scott Klement's IFS_ebook, I was able to put a streamfile (.pdf) to a 
user space and send the user space via mq.
http://www.scottklement.com/rpg/ifs.html
Regards,
Magne

-----Original Message-----
From: McCully, Keith (RBS Insurance) [mailto:Keith.McCully@xxxxxxxxx]
Sent: Monday, August 14, 2006 04:13 PM
To: ''Java Programming on and around the iSeries / AS400''
Subject: RE: Differences between calling Java from Qshell and RPG?


Paul Nicolay wrote on 11/08/2006 @ 15:54 :
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****************
Your reason to use Java for connecting to MQ was apparently inspired by not
having MQ on the source system itself (it's a shame there's no native
client). While I had the same issue in the past, I solved this by using a
remote dataqueue so that the "copy" job could run on the system where MQ was
available. (and no Java was needed)

The problem is that both yours and my solution destroy the advantage of
using MQ since a network failure will finally cause the dataqueue to
overflow and probably crash the initial program or at least loose messages.

****************************************************************************
****************

Hi Paul,

I'm sorry if I've misinterpreted your first paragraph but isn't this only
going to work if both local and remote systems are iSeries? The 'copy' is
fine for relatively small messages but our requirement is to allow for
messages upto 800kB whereas the DTAQ goes upto 65kB. I seem to remember that
MQ can go upto 100 Mb per message!

My application is on the backend server which is an iSeries and where the
database and MQ reside. The client system that puts/gets from the MQ is
written in Java but the platform is still to be decided. However, it will
not be an iSeries.

The reason I decided in favour of Java over RPG was that the client system
team had already developed the MQ message/attachment classes and I was able
to 'borrow' these. In a previous email I mentioned that it might not be
possible to send .pdf attachments in RPG/MQ whereas it was quite
straightforward in Java. On reflection, that probably isn't strictly true as
I could convert the .pdf to a binary stream. However, going with Java
certainly reduced the development effort on the client side though it gave
me an interesting learning curve!

Regarding performance, I'm getting a request off the DTAQ and onto the MQ in
around 0.05 second. This includes a 0.5 Mb .pdf attachment and, for now, I'm
running on optimization level 10.

Regarding network failure, in our case, the DTAQ wouldn't overflow because
the client would be unable to send requests inwards.

Kind regards,

Keith











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