Web Oriented Architecture WOA-at? Aaron Roe Fulkerson @roebot www.mindtouch.com

Another @#$^ing Acronym? What dumb*!@ analyst/journo coined this?

Coined in 2005: WOA = SOA + REST + WWW Disclaimer: Nick strikes me as a smart guy. Nick Gall, Gartner

Coined in 2005:

WOA = SOA + REST + WWW

Disclaimer: Nick strikes me as a smart guy.

What is SOA? SOA apologists will say it is modular + distributable + sharable + loosely coupled Meaning SOA is either: Something so generic it’s meaningless Even Linux Daemons qualify as modular, distributed and loosely coupled. Is this SOA? OR A Collection of technologies (ESB, SOAP, WSDL….) and a design pattern “ Damn vendors co-opted our term for their own nefarious devices!”

SOA apologists will say it is

modular + distributable + sharable + loosely coupled

Meaning SOA is either:

Something so generic it’s meaningless Even Linux Daemons qualify as modular, distributed and loosely coupled. Is this SOA?

OR

A Collection of technologies (ESB, SOAP, WSDL….) and a design pattern

“ Damn vendors co-opted our term for their own nefarious devices!”

I’m Co-opting WOA now…

WOA = REST + WWW

WOA = REST + WWW

REST – a Software Design Pattern WOA = REST + WWW An architectural style defined, in part, by: Stateless Everything is a URI, a resource Only representations are exchanged No direct interactions with resources … . (More? Go read Fielding)

WOA = REST + WWW

An architectural style defined, in part, by:

Stateless

Everything is a URI, a resource

Only representations are exchanged

No direct interactions with resources

… . (More? Go read Fielding)

WWW – Web Technology Stack WOA = REST + WWW A technology stack Uniform interface for interaction: HTTP Uniform Interface for behavior (or application state): HTML

WOA = REST + WWW A technology stack

Uniform interface for interaction: HTTP

Uniform Interface for behavior (or application state): HTML

Make Machine to Machine Interaction As EASY As Human to Machine Interaction is on the WWW

Why WOA Matters Because it’s RAD! … dude.

Because it’s RAD! … dude.

WOA Yields

Formats HTML Protocols HTTP Hardware Routers, proxies WOA Wins By Leverages Existing Standards

Formats

HTML

Protocols

HTTP

Hardware

Routers, proxies

Because we have open standards Uniform Interface for Interactions: HTTP Uniform Interface for Behavior (application state) Interface: XHTML Human to Machine Interaction on the WWW is EASY

Because we have open standards

Uniform Interface for Interactions: HTTP

Uniform Interface for Behavior (application state) Interface: XHTML

Humans are forgiving Humans will excuse: Typos Ambiguity Bad design Buggy software Human are EASY to Program

Humans will excuse:

Typos

Ambiguity

Bad design

Buggy software

… and stupid. Machines are Unforgiving

… and stupid.

Challenges for Machine to Machine We have Uniform Interface for Interactions HTTP is so simple (and cute) GET, PUT, POST… But Need BETTER Uniform Interface for Behavior (application state)

We have Uniform Interface for Interactions

HTTP is so simple (and cute) GET, PUT, POST…

But

Need BETTER Uniform Interface for

Behavior (application state)

(X)HTML Too rich broadly defined hard to understand and error prone Expensive to process The freedom of the producer is the burden of the consumer

Too rich

broadly defined

hard to understand and error prone

Expensive to process

The freedom of the producer is the burden of the consumer

SOAP = HTTP + <more> Closed hides too much and creates complexity Standard XML envelop non-standard contents Doesn’t reuse HTTP Can’t leverage standard hardware XML accelerators Higher TCO

Closed

hides too much and creates complexity

Standard XML envelop

non-standard contents

Doesn’t reuse HTTP

Can’t leverage standard hardware

XML accelerators

Higher TCO

RDF (Again) too rich still broadly defined hard to understand and error prone Expensive to process (Again) the freedom of the producer is the burden of the consumer

(Again) too rich

still broadly defined

hard to understand and error prone

Expensive to process

(Again) the freedom of the producer is the burden of the consumer

ATOM PUB Well defined and constrained (yaay!) Lists and entries Defined verbs General purpose agents exist Simple, like nature…like HTTP Problem: Can’t create new resources Edit and delete only (monotonically decreasing, boo!)

Well defined and constrained (yaay!)

Lists and entries

Defined verbs

General purpose agents exist

Simple, like nature…like HTTP

Problem:

Can’t create new resources

Edit and delete only (monotonically decreasing, boo!)

WOA: Realizing the Dream Inexperienced programmers can rapidly extend existing systems Quickly build valuable applications from composites of other systems Enterprises realize value from expensive SOA infrastructure TCO for enterprises dramatically lower

Inexperienced programmers can rapidly extend existing systems

Quickly build valuable applications from composites of other systems

Enterprises realize value from expensive SOA infrastructure

TCO for enterprises dramatically lower

Be a WOA-rrior Photo Credit: “Cayusa” via Flickr

Makes You REST-afarian Photo Credit: “Voice of Guyana” via Flickr

Aaron Roe Fulkerson @roebot www.mindtouch.com P.S- MindTouch Core is Free like speech and beer. Download Today!