SOA & APIs: Fearless Lessons from the Field

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SOA and APIs:

Fearless Lessons from the Field Mike Amundsen

Principal API Architect

@mamund

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Fearless

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Fearless

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Fearless

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Mike Amundsen

Architect, Developer, Presenter

Hypermedia Junkie

Principal API Architect for Layer 7

“Help people build great APIs for the Web”

Personal Mission

“Improve the quality and usability of information on the Web.”

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THE CHALLENGE

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More Devices

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More Apps

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More APIs

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The Challenge

Mobility

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The Challenge

Agility

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The Challenge

Mobility = Agility

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The Challenge

Increase Agility

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The Challenge

Maintain Stability

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Lessons from the field

Models and tools

REST and Hypermedia

Broad Experience

SOAP, CRUD, and Hypermedia

High-level View

The USE Paradigm

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REST AND HYPERMEDIA

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REST and Hypermedia

REST is an architectural model for

widely distributed systems

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REST and Hypermedia - Space

http://www.flickr.com/photos/jram23/3088003105/

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REST and Hypermedia - Time

http://www.flickr.com/photos/alancleaver/2661425133/

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REST and Hypermedia - Model

http://www.flickr.com/photos/usnationalarchives/5476286211/

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REST and Hypermedia - Tools

http://http://www.flickr.com/photos/36247316@N00/3108399560/

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REST and Hypermedia

Hypermedia is a tool for

implementing remote, evolvable

systems

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REST and Hypermedia - Space

http://www.flickr.com/photos/jram23/3088003105/

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REST and Hypermedia - Time

http://www.flickr.com/photos/alancleaver/2661425133/

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REST and Hypermedia – Evolvable

http://www.flickr.com/photos/isherwoodchris/5811756295/

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REST and Hypermedia – Evolvable

http://http://www.flickr.com/photos/ecbiosheron/4139220163/

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REST and Hypermedia – Evolvable

http://http://http://www.flickr.com/photos/nrg07/4735858552/

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REST and Hypermedia – Real World

http://www.flickr.com/photos/smaku/233763545/

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SOAP, CRUD, AND HYPERMEDIA

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SOAP is for Components

http://www.flickr.com/photos/amberwalker/5755325926/

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SOAP is for Components

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SOAP is for Components

Strong on XML, Weak on HTTP

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CRUD is for Objects

http://www.flickr.com/photos/topekalibrary/4294393624/

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CRUD is for Objects

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CRUD is for Objects

Strong on HTTP, Weak on Workflow

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Hypermedia is for Messages

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Hypermedia is for Messages

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Hypermedia is for Messages

Strong on HTTP, Strong on Workflow

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SOAP, CRUD, Hypermedia

Moving away from SOAP

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SOAP, CRUD, Hypermedia

Implementing CRUD

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SOAP, CRUD, Hypermedia

Heading toward Hypermedia

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THE USE PARADIGM

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Usable

Usability is the ease of use and learnability of

a human-made object.

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Usable – Action Life Cycle

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Usable – Focus on tasks

http://www.flickr.com/photos/somoamsterdam/4833837888/

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Usable – Employ empirical measurement

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Usable – Iterative design

http://www.flickr.com/photos/aajbutler/5448088057/

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Usable

Focus

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Usable

Measure

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Usable

Iterate

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Scalable

Scalability is the ability of a system, network,

or process, to handle a growing amount of

work in a capable manner.

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Scalable – Out vs. Up

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Scalable

http://www.flickr.com/photos/27976837@N00/4347462236/

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Scalable – DevOps

http://www.flickr.com/photos/friendlydragon/3864150771/

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Scalable – Where it counts

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Scalable

Scale Out

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Scalable

Automate

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Scalable

Where it counts

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Evolvable

Evolvability is defined as the capacity of a

system for adaptive change.

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Evolvable

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Evolvable (pandere – to stretch)

http://www.flickr.com/photos/kenjonbro/6277623578/

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Evolvable (vertere – to turn)

http://www.flickr.com/photos/erdero/2274374743/

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Evolvable

Versions “break”, extensions don’t.

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SUMMARY

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Summary - Challenge

Mobility

Agility

Stability

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Summary – Models

http://www.flickr.com/photos/usnationalarchives/5476286211/

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Summary – Tools

http://http://www.flickr.com/photos/36247316@N00/3108399560/

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Summary – Components

http://http://www.flickr.com/photos/36247316@N00/3108399560/

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Summary – Objects

http://www.flickr.com/photos/topekalibrary/4294393624/

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Summary – Messages

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Summary – Usable

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Summary – Scalable

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Summary – Evolvable

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SOA and APIs:

Fearless Lessons from the Field Mike Amundsen

Principal API Architect

@mamund