What is Software Architecture? Difference between software Arc, Design and Coding Tenets of SW Arch Architecture Significant Requirement Documentation of Software Architecture

1. Expertise in Programming
Talks in Architecture
Why not just design?
By
Mustafa Gamal
www.mustafamg.com

2. Writing Code
Design
Architecture

3. They all are Design
Writing Code Design Architecture

4. Modern Software Architecture
Significance & Impact!
Decisions
HighLow
Implementation Design Architecture
All architecture is design, but not all design is
architecture!
Design & Architecture exist in a continuum

5. Coding
• A sum function
• For Loop
for(int i=1; i<end; i++)
sum+=I;
• Recursion
• return i + sum(i - 1);
• Equation
• N(N+1)/2

6. Coding Concerns

7. Design
Proxy Design Pattern

8. Design Concerns

9. Software Architecture
• Competing Consumers pattern

10. Architecture Concerns

11. SW Architecture Tells What the System is about

12. What is Software
Architecture?
The first pen in your design

13. SW Architecture Tells What the System is about
12:38
Restful
Webservices
DB
REST

14. The significant decisions about the organization of
a software system
12:38
Restful
Webservices
DB
REST
The selection of the structural elements and their
interfaces by which the system is composed

15. The selection of the structural elements and their
interfaces by which the system is composed
12:38
Restful
Webservices
DB
REST

16. The behavior of collaboration among those
elements
http://wiki.servicenow.com/index.php?title=OpenID http://www.cloudcasts.net/devguide/Default.aspx?id=11020
The composition of these structural and
behavioral elements into larger subsystems;

17. Software
Architecture
Definition
The significant decisions about the organization of a software
system
The selection of the structural elements and their interfaces by
which the system is composed;
The behavior of collaboration among those elements;
The composition of these structural and behavioral elements into
larger subsystems;
The architectural style that guides this organization.
Involves functionality, usability, resilience, performance, reuse,
comprehensibility, economic and technology constraints,
tradeoffs and aesthetic concerns.

18. Software Architecture
Tenets

19. Big Picture

20. Cost of Change

21. Quality Attributes
http://blog.jessitron.com/2015/04/the-quality-wheel.html

22. Architecture
Significant
Requirement
Are those requirements that play an important role in
determining the architecture of the system.
Requirements require special attention.
Not all requirements have equal significance with
regards to the architecture.

23. Modern Software ArchitectureSlide: 23
Avoid the Sixth Soldier’s Problem
World War 1 artilleryWorld War 2 artillery
Capture
Decisions + Reasons

24. Modern Software ArchitectureSlide: 24
Release one
Release Two
UpFront
EarlyDevelopment
Active Development
Maintenance
Time
ArchitectureEffort
Architecture Effort Over Time
(1/2)

25. Modern Software ArchitectureSlide: 25
Version one
Version Two
UpFront
EarlyDevelopment
Active Development
Maintenance
Time
ArchitectureEffort
Architecture Effort Over Time
(2/2)

26. Software Architecture Styles

27. Monolith Or Microservice

28. Layering
Modern Software ArchitectureSlide: 28
Data Access
Domain Logic
Presentation
Partition
Layer
FeatureFeatureFeature

29. SOA Or Microservice

30. Event Driven
Architecture

31. Fowler’s Quadrants
Modern Software ArchitectureSlide: 31
InadvertentDeliberate
InadvertentDeliberate
Reckless Prudent
Reckless Prudent
“What is layering?”
“We don’t have
time for design?”
“We must ship now
and deal with the
consequences
later?”
“Now we know
how it should
be done!”
How software entropy accumulates?
Or what you
didn’t know that
you don’t know!

32. Architecture Documentation
Contents
1.Front Matter
2.Motivation and purpose
3.Product overview
4.Architectural drivers & ASRs
5.Architecture Constraints
6.Technology selection &
rationale
7.Main architectural
decisions & rationale
8.Naming & coding standards
Modern Software ArchitectureSlide: 32
9. Module View
10. Module Catalogue
11. C&C View
12. Relevant Allocation views
13. Module & Layer APIs
14. C&C Protocols & APIs
15. Idiomatic Design Patterns
16. Volatilities & weaknesses
17. Glossary of terms
18. References
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