|
midrange.com
Colin,
How would I make sure the server job stays open if I'm calling an RPG
program say from within a WebSphere servlet/JSP application? By keeping
the com.ibm.as400.data.ProgramCallDocument object alive? I suppose this
could be achieved by storing the PCML object inside the WebSphere session?
Since two website users could access the same page at the same time and
these would be running in seperate threads both users could end up
retrieving the PCML object at the same time and trying to invoke the RPG
program at the same time. Surely some problems must arise trying to do
things like this?
Just plugging the question because we're in the same dilemma as everyone
else having this discussion. Historically all our core application is
COBOL generated from COOL:2E, but many of those have become huge and
unmaintanable so we are looking at slowly rewriting all the core business
objects in Java, but this is much more based on Java code being more
maintainable and better designed rather than any performance decisions.
But it does mean we'll have Cobol 'green screens' calling Java programs to
do their DB2 reads/updates in the background, and we'll also likely have
Java programs running in the website which are calling RPG programs for
their back ends. I'm not really nervous about having a mix like this, just
wondering if I should be :-) or if we're going to run into any major
performance issues.
Thanks,
Nigel Gay.
|---------+------------------------------------------------->
| | Colin Williams |
| | <colin.williams@xxxxxxxxxxxx> |
| | Sent by: |
| | java400-l-bounces+ngay=cpaglobal.com@m|
| | idrange.com |
| | |
| | |
| | 12/03/2004 10:02 |
| | Please respond to Java Programming on |
| | and around the iSeries / AS400 |
| | |
|---------+------------------------------------------------->
>--------------------------------------------------------------------------------------------------------------|
|
|
| To: "'Java Programming on and around the iSeries / AS400'"
<java400-l@xxxxxxxxxxxx> |
| cc:
|
| Subject: RE: Mixed RPG/Java performance (EXAMPLE CODE)
|
>--------------------------------------------------------------------------------------------------------------|
Nigel,
One answer to this is to call your RPG from java as a stored procedure, and
just pass a parameter to indicate when you want to do a close, just as you
would from RPG.
I believe that you should be able to achieve this without registering the
RPG as a stored proedure, as long as you keep your as400 server job open
between calls, and pass it the relevant parameter.
Cheers
Colin.W
-----Original Message-----
From: NGay@xxxxxxxxxxxxx [mailto:NGay@xxxxxxxxxxxxx]
Sent: 12 March 2004 12:22
To: Java Programming on and around the iSeries / AS400
Subject: RE: Mixed RPG/Java performance (EXAMPLE CODE)
Joe,
What about when the RPG has a few tables to open up and access? If you
called the same RPG program say 100 times, and the RPG program accessed say
5 DB2/400 tables, wouldn't it re-open those tables on every call? With an
RPG program calling another RPG program you can get it to keep the tables
open so you don't have this overhead each time but when calling from Java
isn't a totally new RPG environment on each call and so there'd be a huge
overhead every time of opening up all the tables? This is the kind of
thing
which worries me about calling RPG from Java - not the speed of the program
call itself.
Thanks,
Nigel Gay.
|---------+------------------------------>
| | "Joe Pluta" |
| | <joepluta@plutabrot|
| | hers.com> |
| | Sent by: |
| | java400-l-bounces@m|
| | idrange.com |
| | |
| | |
| | 11/03/2004 13:27 |
| | Please respond to |
| | Java Programming on|
| | and around the |
| | iSeries / AS400 |
| | |
|---------+------------------------------>
>---------------------------------------------------------------------------
-----------------------------------|
|
|
| To: "'Java Programming on and around the iSeries / AS400'"
<java400-l@xxxxxxxxxxxx> |
| cc:
|
| Subject: RE: Mixed RPG/Java performance (EXAMPLE CODE)
|
>---------------------------------------------------------------------------
-----------------------------------|
> You have a problem. I can call a program hundreds of times a second,
> and that's from my PC to my little model 270. I included the RPG
> program, the Java program and the results at the end of this post.
CODE FOR EXAMPLE:
Program SB0001 in library SANDBOX
d xidata ds
d counter 5 0
d xwcount s 5 0
C *entry plist
C parm xidata 5
C
C eval xwcount = xwcount + 1
C eval counter = xwcount
C return
Java class CallSB0001
public class CallSB0001 {
private static AS400Text at5 = new AS400Text(5);
public static void main(String[] args)
throws Exception
{
AS400 sys = new AS400();
ProgramCall pc = new ProgramCall( new
AS400(),
"/QSYS.LIB/SANDBOX.LIB/SB0001.PGM",
new ProgramParameter[] {
new ProgramParameter(5)
});
SimpleDateFormat sdf = new
SimpleDateFormat("hh:mm:ss.SSS");
for (int x = 0; x < 100; x++)
{
pc.run();
String data = (String)
at5.toObject(pc.getParameterList()[0].getOutputData());
String date = sdf.format(new Date());
System.out.println(date + " " + data);
}
sys.disconnectAllServices();
System.exit(0);
}
}
Selected Results:
10:32:24.938 00001
10:32:24.938 00002
10:32:24.938 00003
10:32:25.016 00049
10:32:25.016 00050
10:32:25.016 00051
10:32:25.125 00098
10:32:25.125 00099
10:32:25.125 00100
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