Effective ArchitectingBest Practices & Guidelines for Software Architects

Case Study: Patterns and Styles in Compilers

Overarching StyleLexical Analyzer

Parser (Syntax & Semantic Analysis)

Optimizer

Code generator

Pipe-and-filter style

Compiler DriverFacade pattern

Representing grammarInterpreter

pattern

Generating code

Source: “Design Patterns: Elements of Reusable Object-Oriented Software”, Erich Gamma, Richard Helm, Ralph Johnson and John Vlissides, Addison-Wesley,1994

Visitor pattern

source: https://github.com/cer/event-sourcing-examples/wiki/i/applicationarchitecture.png

Apply relevant patterns and styles for effective architecting

“Cities grow, cities evolve, cities have parts that simply die while other

parts flourish; each city has to be renewed in order to meet the needs of its populace… Software-intensive systems

are like that. They grow, they evolve, sometimes they wither away, and

sometimes they flourish…”

Grady Booch in the foreword for “Refactoring for Software Design Smells: Managing Technical Debt”, Girish Suryanarayana, Ganesh Samarthyam, Tushar Sharma, Morgan Kaufmann/Elsevier, 2014.

CodeCity tool

Code Query Language (NDepend, Architect, …)

Look at the world differently for creative design solutions

Who coined the term “code

smell”?

Hint: He also originated the

terms TDD and XP

Kent Beck

Who coined the acronym “SOLID”?

(as in SOLID principles)

Hint: He is the author of the book

“Working effectively with legacy code”

Michael Feathers

S Single Responsibility Principle

Every object should have a single responsibility and that should be encapsulated by the class

O Open Closed Principle Software should be open for extension, but closed for modification

L Liskov’s Substitution Principle

Any subclass should always be usable instead of its parent class

I Interface Segregation Principle

Many client specific interfaces are better than one general purpose interface

D Dependency Inversion Principle

Abstractions should not depend upon details. Details should depend upon abstractions

Who coined the term “technical

debt”?

Hint: He is the creator of “wiki”

Ward Cunningham

When,duetoconstraints,Idesignquicklyanddirty,myprojectisloadedwithtechnicaldebt

NumberofAccessedVariables

CyclomaticComplexity

NewlyAddedService

PercentageofNewlyAddedService

Infusionwww.intooitus.com/products/infusion

Violates Single Responsibility

Principle (SRP)

PublishedinJournalofObjectTechnology(Vol.12,No.2,2013)   SGGanesh,TusharSharma,GirishSuryanarayana.TowardsaPrinciple-basedClassifica4onofStructuralDesignSmells.InJournalofObjectTechnology,vol.12,no.2,2013,pages1:1–29.doi:10.5381/jot.2013.12.2.a1  URL:hLp://www.jot.fm/issues/issue_2013_06/arPcle1.pdf(openaccess)

"This is a good book about ‘Design Smells’ – actually a great book – nicely organized - clearly written with

plenty of examples and a fair sprinkling of anecdotes."

- Will Tracz (Principal Research Scientist & Fellow, Lockheed Martin)

(review in ACM SIGSOFT Software Engineering Notes)

Believe in your ideas: how small or “insignificant” it may

appear to be!

Steve Jobs is viewed as an excellent speaker, business person, and leader. But

not much as an architect. He is an excellent architect.

Why?

In the movie Steve Jobs, he gives an example of a music composer. The composer directs the

people and focuses on the orchestra.

That is the case with a software architect as well.

As an architect, be a problem solver & technology leader

What is the key to grow big and succeed?

Other organizations

Your organization

Gradually expand your circle of influence

Your departmentYour team

The world

Some ways to expand your

circle of influence

Give talks (conference, workshop…)

Write articles, books, white papers, …

Organize meet-ups,

training programs, …

Contribute to process,

quality, and cost-saving

initiatives

Meetups• Software Architecture:

http://www.meetup.com/SoftwareArchitectsBangalore/

• Container Developers: http://www.meetup.com/Container-Developers-Meetup-Bangalore/

• Software Craftsmanship: http://www.meetup.com/Software-Craftsmanship-Bangalore-Meetup/

• Core Java: http://www.meetup.com/Core-Java-Meetup-Bangalore/

• Technical Writers: http://www.meetup.com/Technical-Writers-Meetup-Bangalore/

• JavaScript: http://www.meetup.com/JavaScript-Meetup-Bangalore/

Influence is leadership - expand your influence!

Register here: https://www.townscript.com/e/designpattern

SOLID Principles and Design Patterns BootcampLocation: Bangalore

11 JUN 2016: 10:00AM - 6:00 PM

email sgganesh@gmail.com

website www.designsmells.com

twitter @GSamarthyam

linkedin bit.ly/sgganesh

slideshare slideshare.net/sgganesh