RE: [xml-dev] Exposing resources/services vs hiding implementation details

["Dare Obasanjo" <dareo@microsoft.com>]

> -----Original Message-----
> From: Michael Champion [mailto:michaelc.champion@gmail.com] 
> Sent: Tuesday, April 05, 2005 9:48 AM
> To: xml-dev
> Subject: Re: [xml-dev] Exposing resources/services vs hiding 
> implementation details
> 
> 
> Well, I'm just arguing the classic information hiding position, e.g.
> http://en.wikipedia.org/wiki/Information_hiding
> " hiding of design decisions in a computer program that are 
> most likely to change, thus protecting other parts of the 
> program from change if the design decision is changed."  I 
> would have to agree that security by obscurity is not 
> something to rely on, but I'm not sure I would agree that 
> advertising your internal architecture to potential hackers 
> is a great idea either.

It seems you are confusing domain models with internal architectures. 

> > If I turned your argument around and said there should be one 
> > self-joining uber-table (property values) or one uber-object 
> > (HashMap?) in a system it would surely be something to question. 
> > What's special about mapping a domain onto URL space that 
> we have to have one uber-URL?
> 
> The strawman version of my position is essentially SOA dogma 
> - expose the service and the service contract to the client, 
> hide everything else.  Whether the service is implemented as 
> an ubertable, an uberobject, or a nicely 
> normalized/decomposed system of both, or by an army of people 
> in a call center somewhere, is none of the client's business, 
> so long as they get the contracted service and the quality of 
> service they expect.  More importantly, the implementation 
> techniques can evolve without affecting the client.

And the service will still have a domain model because it will have to
describe what messages it sends back and forth. I don't see how this
differs from the REST case except the fact that with REST you get to
address such objects via URIs and gain a bunch of benefits from the Web
infrastructure. 

Can you clarify your position? 

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