Re: Perfect Match - Java and RPG and User Spaces?

Hi
I have been working on a project where the business
logic is in RPGLE, I have been using 2 approches for
it,
One is when i need to call a RPG program from java, I
use PCML and it is failry easy to do so.
But other one is where i have to create a PDF file on
AS400, which is not possible using RPG. So i am using
java to create pdf file, and for communication between
RPG and java i am using DataQ, I have defined a
seperate subsystem on AS400, where in i submit a java
program which is listening to a incoming dataq, RPG
program sends some parameters to this incoming dataq,
As soon as the java programs gets this message in
dataq it does the processing and create a pdf file on
IFS folder of AS400, and sends a message back in
Outgoing dataq which is a keyed dataq and the key is
the job number of the RPG program calling it(job
number is part of message in incoming dataq)
the RPG program is now listening to outgoing dataq, as
soon as it gets a message with the key as the job
number.It reads this message and does further 
processing.
Originally i was using direct call from RPG to Java
but there are some problems if you do reclaim resource
, and the process is also slow.
I hope i am clear of what i am doing, and helps u 
Ashish
--- "Bartell, Aaron L. (TC)"
<ALBartell@xxxxxxxxxxxxxx> wrote:
> 
> The recent discussions ("Strategic Java Usage",
> "Mixed RPG/Java
> Performance", "EJB versus RPG/COBOL") have peaked my
> interest immensely,
> thanks for everyone's comments!
> 
> I am working on a Java/RPG solution that will be
> used to get our iSeries
> machines into an HTTP SOA (Service Oriented
> Architecture) type model.  I
> have created web services with RPG programs, but
> parsing XML just isn't
> RPG's forte, even with IBM's parser and my wrapper
> that I wrote for it.
> 
> I have recently been looking at having Java do all
> HTTP communication and
> XML parsing and once an XML document had been parsed
> into the appropriate
> "object" it would then be passed to a "Mediator"
> that would decide what RPG
> business logic program needed to be called based on
> the XML's envelope
> contents.  The kind of XML documents I am talking
> about are anything from
> simple requests like "getItem" to something quite
> large like
> "PurchaseOrderRequest".  
> 
> Being that I need to pass large amounts of data from
> Java to RPG I have been
> looking for different ways that both can easily talk
> to each other.  The
> model I am planning on using for this is to write
> the parsed information to
> a "smart" User Space for the RPG program to pick up
> after the Java program
> has notified it that there is something available. 
> By "smart" User Space I
> simply mean I have come up with my own method of
> defining an object sort of
> structure within the User Space.  Each set of data
> in the User Space is
> prefixed with the name of that chunk of data and the
> size that it takes up.
> Here is the code for the "smart" user space that I
> have built:
> http://mowyourlawn.com/files/UsrSpc/USRSPCFN.RPGLE 
> along with an example:
> http://mowyourlawn.com/files/UsrSpc/USRSPC.RPGLE
> 
> The things that I am wondering about are if this is
> an efficient method that
> may give me performance problems in the future.  Or
> should I go to a
> different method like socket connections?  Any
> insight on how to make this
> Java/RPG relationship work beautifully would be
> greatly appreciated.  I hope
> I have explained what I am trying to do, it is
> basically what others have
> stated in the most recent discussions.
> 
> TIA,
> Aaron Bartell
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