Re: Webfacing - Where to run the HLL programs?

Mark,

Thank you for your comments.  I'll forward these on to my boss.  And thank 
you for the port.

Rob Berendt
-- 
"They that can give up essential liberty to obtain a little temporary 
safety deserve neither liberty nor safety." 
Benjamin Franklin 





"Mark Phippard" <MarkP@xxxxxxxxxxxxxxx>
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05/16/2003 05:31 PM
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Rob,

The machine with the display files will take the interactive hit (unless 
it
is one of the new models, on which there is no interactive hit).

I would go with the HLL's on the box you call DATA.  WebFacing typically
uses port 4004 to communicate, although I do not know if it uses more 
ports
as well.

I think one of the points of WebFacing is to be able to take an 
application
to the web without modifying it.  If you are going to consider modifying
your HLL's so that they can run on a different machine than the database,
then in my opinion you shouldn't be looking at WebFacing in that 
situation.
If you are going to go to the trouble to change those programs, you might
as well do it in conjunction with one of the other more conventional web
development techniques such as CGI or JSP/Servlet.  Why incur the overhead
of WebFacing at all in that situation?

The end result of WebFacing has a lot of faults and drawbacks, it is only
when weighed against how little it costs to produce that result that it
really makes any sense.

Hope this helps.

Mark


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I've got an iSeries for web serving.  Let's call this WEB.  I've got
another system where the data resides on.  Let's call this DATA.

At this time we are pursuing Webfacing some applications.

With webfacing you can have your WAS and the jsp's created by Webfacing on
one iSeries, and your HLL programs on another.  And your data on one of
these two, or another machine(s).

If we store our HLL (RPGLE, CLLE, etc) on WEB we can access the data on
DATA using any number of methods:
- Stored procedures
- DDM
- SQL's CONNECT TO statement
- DATA QUEUE's, message queue's, MQSeries, etc

However we are leaning towards storing our HLL on DATA.

I want to make sure that I maximize security and performance with a
secondary goal of making it simple.

One mandate is that there is zero replication of data.

Which machine takes the interactive hit?
A - The machine running WAS - WEB
B - The machine with all the HLL, screen files, etc - DATA

Currently WEB is in the DMZ and cannot initiate any processes on DATA.  No
telnet, ftp, ddm, etc.  DATA can initiate most anything on WEB.
What do I have to open up on the firewall to allow WEB to run the HLL on
DATA?

Any concerns, suggestions for improvement, etc?

Rob Berendt
--
"They that can give up essential liberty to obtain a little temporary
safety deserve neither liberty nor safety."
Benjamin Franklin
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