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RE: Web Services/SOA (was RE: XML 2004 weblog items?

• To: "Rich Salz" <rsalz@d...>
• Subject: RE: Web Services/SOA (was RE: XML 2004 weblog items?)
• From: "Dare Obasanjo" <dareo@m...>
• Date: Mon, 29 Nov 2004 20:52:49 -0800
• Cc: "Mark Baker" <distobj@a...>,"Chiusano Joseph" <chiusano_joseph@b...>,<xml-dev@l...>
• Thread-index: AcTWi+lST/0/HHdaTLSn0JsJEyGYdAAC1H2A
• Thread-topic: Web Services/SOA (was RE: XML 2004 weblog items?)

> -----Original Message-----
> From: Rich Salz [mailto:rsalz@d...] 
> Sent: Monday, November 29, 2004 7:23 PM
> To: Dare Obasanjo
> Cc: Mark Baker; Chiusano Joseph; xml-dev@l...
> Subject: RE:  Web Services/SOA (was RE:  
> XML 2004 weblog items?)
> 
> > Or is there an 'RPC architectural style' that I am unaware of?
> 
> Yes:  a "method name" and calling sequence (e.g., multiple 
> parameters) and return value.  In SOA, you think more of 
> sending XML documents around and there's only one method, 
> probably POST, and some meta-data, like a URI/URL.
> 
> It is admittedly kinda fuzzy-wuzzy, but that's not uncommon 
> when you start talking about "architecture." :)

So SOA is RPC with a calling convention for methods? Sounds silly to me.
I like Don's four fundamentals of service orientation from
http://msdn.microsoft.com/msdnmag/issues/04/01/Indigo/default.aspx 

* Boundaries are explicit 
* Services are autonomous 
* Services share schema and contract, not class 
* Service compatibility is determined based on policy 

It's basically a philosophy on how one should treat building distributed
application instead of a way to repackage yesterday's technology with
today's buzzwords so one can charge an arm and a leg for building
applications with tomorrow's toolkits.

I especially like the fact that it's quite easy to see how RESTful
applications are service oriented using those guiding principles. 

--
PITHY WORDS OF WISDOM 
Ade's Law: Anybody can win -- unless there happens to be a second entry.


This posting is provided "AS IS" with no warranties, and confers no
rights.  

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