Surviving architecture

surviving architecture

Mittwoch, 23. Juni 2010

๏ PHP, C++, Developer, Software Architect since 1992

๏ PHP since 1998๏ Many successful projects from 2 to 20 developers

๏ Running right now three projects using eXtreme

Programming

๏ CTO and (Co-)Founder swoodoo AG๏ Founder OXID eSales AG

Lars Jankowfsky

...awesome!!!

๏ PHP, Delphi, Java, Developer, Software since 1992

๏ PHP since 1999๏ Many successful projects from 2 to 20 developers

๏ Running a company based on SCRUM, XP and Crystal

Johann-Peter Hartmann

CTO CEO

CTO CEO... develops big web apps

...fixes security issues done by Mayflower

WHY?Mittwoch, 23. Juni 2010

Great!

... don‘t you hate that word?

right?

Ruby on Rails

Scala/Lift

client - server

client - server... kinda old school

Frontend and Backend

Three-tier model

Event Driven Architecture

Implicit invocation

Monolithic application

Monolithic application...most likely your first

software project

Peer 2 Peer

S.O.A.

C.O.A.

Shared nothing

Space based

Messaging/Queues

HOW?Mittwoch, 23. Juni 2010

What your architecture should provide

(ISO 9126 for fun and profit)

Functionality

๏Suitability๏Accuracy ..๏Interoperability๏Compliance๏Security

Reliability

๏Maturity๏Recoverability๏Fault Tolerance

Efficiency

๏Time Behaviour๏Resource Behaviour

Usability

๏Learnability๏Understandability๏Operability

Maintainability

๏Stability๏Analyzability๏Changeability๏Testability

Portability

๏Installability๏Replaceability๏Adaptability๏Conformance

Not every architecture works everywhere

A.T.A.M.

check business drivers

check architecture quality goals

let stakeholders create important scenarios

check architectures

Identify PITA per architecture

Identify PITA per architectureWTF/Min.

DECIDE

So you know the right architecture?

... Houston, we have a problem!

Fortune 500

1976-1986:

50 Companies changed.

36 Companies changed.

But it‘s cool to change fast, too

You + Change =1 Month

Competitor + Change = 12 Months

Startup Architecture

Lifecycle

create cheap prototype

Lifecycle

get VC,grow fast

Lifecycle

get VC,grow fast

succeed

Lifecycle

get VC,grow fast

succeedget screwed

by your cheap fast

architecture

Lifecycle

get VC,grow fast

succeed

do it right

get screwed by your

cheap fast architecture

Architecture must change

„Flexibility can be viewed as an option“

Nobel price lecture 1997

Volatile environments

Volatile environmentsYou are here.

„Real Options“

„Real Options“Google Dork

Growth Option

Exit Option

http://www.flickr.com/photos/grdloizaga/

Platform Option

http://www.flickr.com/photos/grdloizaga/

http://www.flickr.com/photos/randysonofrobert/

Delay Option

Learning Option

=Mittwoch, 23. Juni 2010

Embrace change!

Surviving architecture howto

„Everything in software changes.“Kent Beck, 2000

Agile!is a 100% match

No reengineering,No refactoring,No evolution

Deliver frequently

Continuous Integration

Commit frequently

fight code aging!!!

Continuous Inspection

Quality matters even more

quick != dirty

D.R.YDo Not Repeat Yourself

Y.A.G.N.IMittwoch, 23. Juni 2010

Architecture documentation ...

... on paper doesnot work anymore.

That‘s it.Questions anyone?

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