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3 Tiered? N-Tiered? Domain Driver Design?

Posted on 2011-05-09
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Where does DDD fit into the discussion of the number of Tiers in an architecture?

I use:

- MVC3
- Entity Framework
- ViewModels
- Manager classes to manage the interaction between ViewModels and EF4 partial classes

I prefer:
- The IRepository pattern to make changing database or db frameworks easy
- Domain Driven Design

How many Tiers have I described?
Is it even possible anymore to count the number of Tiers?


Thanks,
newbieweb
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Question by:newbieweb
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by:dqmq
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Up to a point, you can count the number of tiers.  1,2, or 3.  But, the "n" in n-tiers sort of implies that number is variant.

But not by listing development methodologies and technologies, as you have done. Using those technologies, you can develop 1,2,3,or N tier.  
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by:newbieweb
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I am a little confused by tier names:

Can you give me an example of the best practice use of n-tiers?
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dqmq earned 2000 total points
ID: 35723775
One tier:
  Put a static html page on your desktop and open it with a browser. Everything done on the workstation.  

Two tier:
  Find a static html page on a website and open it with a browser.  Internet server delivers html to the workstaion, workstation renders it.

Three tier:
  Use the login page of a website.  Application on web server looks up your credentials on a database server, delivers an html response to the workstation.

N-tier
  Purchase something on amazon.  Application on webserver orchestrates the complex process of shopping cart checkout, inluding looking up actual delivery charges from UPS and validating your Mastercard through some Merchant account.


 
 Check out this explanation:

http://www.exforsys.com/tutorials/client-server/n-tier-client-server-architecture.html
           


   
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by:newbieweb
ID: 35753655
Thanks!
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