Re: Getting started with Net.data - was-I'dbetterdomorethan talk

Granted, the HTTP part is pretty minor but when people say "web services" they usually mean SOAP and that is not light weight because of dealing with XML. Also, HTTP keep-alives can cause their own problems because they tie up a server thread until either the client says to close it (fat chance that will happen in a web app) or it times out.

Matt

-----Original Message-----
From: web400-bounces@xxxxxxxxxxxx [mailto:web400-bounces@xxxxxxxxxxxx] On Behalf Of Thorbjørn Ravn Andersen
Sent: Monday, August 18, 2008 11:34 AM
To: Web Enabling the AS400 / iSeries
Subject: Re: [WEB400] Getting started with Net.data - was-I'dbetterdomorethan talk

Haas, Matt (CL Tech Sv) skrev den 18-08-2008 17:06:

Once you understand what exactly has to happen for a web service call, it's pretty obvious that it isn't going to perform well (especially for chatty applications like the above mentioned app). First, you have the CPU and memory usage to build up a pretty bloated XML document and then you have to open a connection to an HTTP server that has to pass all that data to another application (more memory and CPU). That application has to then translate that XML file into what ever type of data structure it needs to deal with (yet more memory and CPU), do what ever it has to do (memory, CPU, other I/O), build up another XML document with its response (more memory and CPU), and send that back to the caller which will most likely then convert it into its own data structures. What about that process sounds like it's good for doing inter process communications?

There is nothing as such wrong with doing web service calls using other
protocols than http, and others may perform better.

In your current scenario I would look at whether your http connections
are recreated at every call, or you can keep the connection open (http
1.0 versus 1.1). That may buy you extra time :)

--
Thorbjørn Ravn Andersen "... plus... Tubular Bells!"

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