Re: How to implement a three layered serivces application

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From: Claudio Grazioli (claudio.grazioli_at_gmx.net)
Date: 03/17/05 

Date: Thu, 17 Mar 2005 08:51:53 +0100

On Wed, 16 Mar 2005 17:49:02 -0800, GoofyIdiot wrote:

Hi Goofy

> Hi,
>
> I've been reading about three layered serivces applications
> (http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnpatterns/html/ArcThreeLayeredSvcsApp.asp)
>
> Now wonder how this fits all together..., am I thinking right, when I say:
>
> You have a DLL for data access components (DAC), which take care of the
> database interaction.
>
> You have a DLL for business entities (BE), which references the DAC for CRUD
> operations....
>
> You have a DLL for Business Components (BC) which references the BE This
> means just checking values etc. of the business entities and check if they
> can be saved, updated, etc.
>
> You have a DLL for BW, which actually just references the BC to set all the
> business rules in one correct order?
>
> You a facade layer which references all BE; BC and BW? How do you implement
> this layer so that it's easy to program the UI?
>
> And are UI Process Components just the Code Behind Files? And what do you
> need to reference from here? Also BE, BC and BW or only the facade layer? How
> do you get your objects then? What is the use of the facade layer then?
>
> And how about the Security, OM and Communication? Are these just
> helperclasses? I would like to get more a more technical view at this
> theoretical documentation....

Well, I'd say a lot of questions for a simple news message to answer! That
would fill books!
I strongly suggest you to read one of the books of Rockford Lhotka about
business objects (and multi-tier applications). His has two books, one for
VB.NET programmers and one for C# programmers. Reading his book (and it's
fun to read because very well written) and your questions are all answered
and you even get a multier-tier open source framework with it, ready to use
for basic n-tier application development.

Visit his web page to get more information on the books:
http://www.lhotka.net 

-- 
Claudio Grazioli
http://www.grazioli.ch

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