RE: Re: Modify the IE Browser -- WEB400

>Too many buzzwords for me. 
HTTP - HyperTextTransferProtocal
XML - eXtensible Markup Language
RPG-CGI - Report Program Generator-Common Gateway Interface
Web Services - A program available through HTTP communication that uses XML
as its data transport.

Just for your notes when you decide web services are a good thing:-)

>For portability, I just use the Java Toolkit, and it runs on any platform
with a JVM.
Scratch portability from that sentence, my mistake.  By doing the above you
are tied to the iSeries platform.  That is why it is loosely coupled if you
just offer a service with any language over HTTP with XML as the data
transport.  Then your Java servlet that is making use of the service doesn't
care that it is on an iSeries, it just cares about the URL and the formats
going in and out.

<Joe>
But I have no idea what YOU mean by loosely coupled.  Evidently, you
consider HTTP communications using XML to communicate with an RPG
program to be loosely coupled, but I don't agree.  Why it has to talk to
an RPG program is beyond me. 
</Joe>

A web service can be written in any language, you are missing my point.

<Joe>
And why is an HTTP call with XML any less loosely coupled than a toolbox
call to one of the OS/400 host servers?  Maybe I want to use a serial
connection.  Or APPC, for security reasons.  Unfortunately, you've tied
me into TCP/IP with your tightly coupled web services design.
</Joe>

There are secure ways to transfer data with web services, try SSL over HTTP
(HTTPS).


<Joe>
Me, I'll just put a wrapper around the delivery class and reimplement it
as needed, without having to touch my application.  That's the point of
OO design.
</Joe>

That is a perfectly acceptable way to write it, say with interfaces, but you
will have to write a new interface implementation every time a you move that
servlet to another platform and try to use it's own method of communication.
HTTP and XML are relieving the programmer from having to know how every
other platform in the world works.  

Check out http://www.w3schools.com and read up on some of the technologies
included there.  Pay special attention to the following:

http://www.w3schools.com/wsdl/default.asp
http://www.w3schools.com/soap/default.asp
http://www.w3schools.com/xml/xml_http.asp

Hope that helps,
Aaron Bartell

-----Original Message-----
From: Joe Pluta [mailto:joepluta@xxxxxxxxxxxxxxxxx]
Sent: Wednesday, September 03, 2003 5:02 PM
To: 'Web Enabling the AS400 / iSeries'
Subject: RE: [WEB400] Re: Modify the IE Browser


> From: Bartell, Aaron L. (TC)
> 
> If you don't use an HTTP call with XML to an RPG-CGI program (web
> services)
> from your Java app how do you make it portable and loosely coupled?

Too many buzzwords for me. 

For portability, I just use the Java Toolkit, and it runs on any
platform with a JVM.  Portability is a pretty well defined term: runs on
different platforms.  How I connect to the host is an implementation
detail.

But I have no idea what YOU mean by loosely coupled.  Evidently, you
consider HTTP communications using XML to communicate with an RPG
program to be loosely coupled, but I don't agree.  Why it has to talk to
an RPG program is beyond me.  If I'm communicating via HTTP, I may be
talking to a servlet, not an RPG program.  The servlet can invoke the
RPG server.

And why is an HTTP call with XML any less loosely coupled than a toolbox
call to one of the OS/400 host servers?  Maybe I want to use a serial
connection.  Or APPC, for security reasons.  Unfortunately, you've tied
me into TCP/IP with your tightly coupled web services design.

Me, I'll just put a wrapper around the delivery class and reimplement it
as needed, without having to touch my application.  That's the point of
OO design.

Joe

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