Multi Tier Architecture

1. YANIV GATIGNO
DEC 2008
n-Tier Architecture

2. Intro

3. Modular X

4. Modular X

5. Modular X

6. Buzz Words
Abstraction
Modularity

7. Trade-Off
Performance
Complexity

8. Definition

9. “
A CLIENT-SERVER ARCHITECTURE IN WHICH, THE
PRESENTATION, THE APPLICATION PROCESSING
AND THE DATA MANAGEMENT ARE LOGICALLY
SEPARATE PROCESSES .
“
(WIKIPEDIA)
Definition

10. 3-Tier Architecture

11. Example

12. MY VACATION WITH MR NORTHWIDH
Example

13. Northwind Management System Reqs
“I have a $200M/year
trade company, but I
want to start by
managing my
products list only”

14. Northwind Management System Reqs
Variants:
Scale
Predicted Ops over Data
Performance
Platform
Price

15. Northwind Management System Reqs
Q: How far can
you see?

16. Northwind Management System Reqs
Variants:
Scale
Big
Predicted Op over Data
Mostly Viewing
Performance
DB Access is slow
Platform
Interchangeable
Price
Open Cheque

17. Northwind Management System Reqs
 3-Tier

18. Specifications
User Scenarios
View all existing products
Add a new product
(Products are never removed)

19. Specifications
System Modules:
Let’s do it together…

20. Specifications

21. Specifications
Notes:
All application consoles interact with a single WebService
‘Proxy’ Design Pattern
Presentation & BL are seperated
Winforms can be easily replaced by WebForm
Presentation & BL communicate via an Interface
BL implementation may be changed without touching the
Presentation

22. Specifications
Notes:
Presentation works with objects
It doesn’t care about the source of the data or its type
Data is cached
Using the Typed DataSet
Presentation doesn’t even know about it
BL communicates Data using ADO
DB can be replaced with hardly any changes in the BL

23. Specifications

24. Specifications

25. Specifications
Presentation Tier
Business Logic Tier
Data Tier

26. Specifications

27. Specifications

28. Specifications

29. Specifications

30. Specifications

31. Specifications

32. Specifications

33. Specifications

34. Specifications
Business Logic Tier

35. Summary

36. Questions?