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Modern Application Architecture

Options and Tradeoffs

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Objective

Understand how modern software solutions are designed so we can focus our efforts on career choices that will enable us

to be successful in a challenging 21st century economy

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Agenda

• History of web applications• Modern architecture• Web 2.0• Deep dive with discussion:

– Forgot Password– Paging– Weather.com

• How to be successful in the 21st century job market

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History of Web Applications

• Early applications were page based with hyperlinks

• HTTP is stateless for performance reasons• Stateless nature places challenges on non-

trivial applications

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Simple Page Based Request / Response

Browser Web Server

Request

Response

HTML

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We Need State

Browser Web Server

Request

Response

Cookies State

HTML

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Modern Architecture

DatabaseLets start with the database

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Modern Architecture

Database

Business Layer

Data Layer

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Modern Architecture

Database

Business Layer

Data Layer

Presentation Layer

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Web Based

Web

Ser

ver Desktop (Generic)

Desktop (Specific)

Mobile (Generic)

Mobile (Specific)

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Applets

Pres

enta

tion

Laye

r Windows

Mac

IPhone

IPad

Android

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Back to Modern Architecture

Database

Business Layer

Data Layer

Presentation Layer

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Modern Architecture

Database

Business Layer

Data Layer

Presentation Layer

Browser

Mobile A

Mobile B

Applet A

Applet B

AgileWithoutDogma.com

Modern Architecture

Database

Business Layer

Data Layer

Presentation Layer

Browser

Mobile A

Mobile B

Applet A

Applet B

Desktop

IPhone Browser

Blackberry Browser

Blackberry Applet

IPhone Applet

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Web 2.0

Browser Web Server

Cookies State

HTML

Ajax

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Deep Dive

• Forgot Password• Paging• Weather.com

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Challenges

• The global middle class will triple by 2030• Hundreds of millions of smart people will

compete for a limited and ever changing set of high paying jobs

• The lucrative job of this decade will not be the lucrative job of the next

• It is easy to become complacent

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How to be successful

• Do what you love• Build a network• Start your savings today so you can be financially

independent (Retire)• Save one years worth of expenses• Adjust you standard of living• Goal – Have job offers come your way when you do not

need them• Understand that your learning starts the day you graduate,

it does not end

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Useful Resources• The Cost Of Waiting - demonstrates the cost of waiting to save for

retirement• JoelOnSoftware.com - blog on all things software• OcambOnConsulting.com – My Blog• NeverEat Alone – Book on Networking• Agilewithoutdogma.com – my new Wiki about Agile in the real world• Mountaingoatsoftware.com - reference on Scrum and Agile by Mike

Cohn• RandsInRepose.com - light hearted and irreverent look and working

with people• Scrum in 10 Minutes – Fast paced introduction of Scrum