Haussmann Fielding Fowler: network-based architects

Network Based Architecture Haussmann, Fielding, Fowler

HTTP, REST, Microservices

Eric Horesnyi

Tech2Day 2015

@StreamdataIO #Tech2Day

Realtime UX from any API


Haussmann & Fielding

1853, Paris 2000, Irvine


CHALLENGES IN PARIS IN 1853 Haussmann Fielding and Fowler


Dropout

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Cholera, 1832 – 19,000 dropout

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Congestion

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1hab/sq mt density

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Slow & Unsecure

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Security threats: No inspection possible

obscure streets

No patches to remove viruses and threats

lack of air circulation

Poor latency: slow access lines

narrow streets

No backbone Street in Ile de La Cité, Early XiXth

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Unstable system

Full reboot 1789, 1815, 1830, 1848…

No backward compatibility

No service desk Restricted vote

DDOS in small access lines

Barricades

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Liberty Leading the People, July 28th, 1830' by Delacroix

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INHERITED FEATURES Haussmann Fielding Fowler


Inherited Properties


DNS

.gov, .com and .fr follow same scheme

Seine is .root

Streets start there

Right/even

Left/Uneven

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Paris street numbering, 1805

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Famous heritage

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Napoleon, France 1804 Tim Berners-Lee, CERN 1990

Comment: // limited to ability to establish basic rules. I do not admire Napoleon for anything else.

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Separation of concerns

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Client Server

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Stateless

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All clients

are treated equal, no special

treatment, no

segregation

A server cannot treat a client, even if he is root, as part of itself: Affaires

Palais de Justice, Ile de la Cité

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Stateless

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Client access server via a network call

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SELECTION OF PROPERTIES FIELDING // HAUSSMANN REST // PARIS

Haussmann Fielding Fowler


Mission

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Network performance throughput, small

overhead, bandwidth

User-perceived performance latency,

and completion

Network-efficiency avoid using the street too

much. Homeworking (differential data)

Napoleon III describing his mission to Haussmann, 1853

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KPIs Haussmann // Fielding Scalable make it possible for Paris to grow

Simple no need for a city-user manual,

Modifiable ability to evolve in the future through change

Extensible add new neighborhood

Customizable specialize a building without impacting others

Configurable easily modify a building post-deployment

Reusable building can host a bakery then a cremerie

Visible to provide best security and auditability

Portable style should work well in other regions

Reliable susceptible to failure (no single event could stop water, gas or circulation for citizens)


P1: Low-Entry Barrier

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A popular neighborhood in Paris

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P2: Extensibility

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Streaming = Paris Metro/Subway, 1900

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P3: Distributed Hypermedia


P4: Anarchic Scalability

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Paris Metropole today, 10m+ people

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P6: Independant Deployment

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Ile de La Cité restructured, embedding legacy/sacred Notre Dame

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WHY HAUSSMANN DECIDED TO MAKE PARIS RESTFUL



REST=LCODC$SS&UI


CSS=Client-Server-Stateless

Layer 1: sewage & gas


Layer 2: street & boulevards


Layer 3: roofs


Layered Networks

Within a layer, a component connects to

its neighboor

Between two layers, gateways allow for

interaction

Each layer is autonomous


Cache

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Le Bon Marché, LeS Bank Grand Magasin/Mall, server w/cache

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Cache

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Opera, a server with cache

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Code On Demand

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Les Halles, seXng the tone for all restaurants in the City

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Uniform Interface = Genious

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Codified UI, by floor (header), with token/key, proxy, cache

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Uniformity = beauty inside

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Uniformity in APIs brings harmony in UX

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Uniformity = pattern beauty

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Uniformity brings fractal harmony: s`ll there from a distance

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HAUSSMANN URBANIST // FOWLER CONTINUOUS DELIVERY & MICROSERVICES



Continuous Delivery

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Resilient Water Inducòn, requiring aqueducts and reservoirs

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Microservices

Not too big/high

Autonomous components

Own API

Standard protocol

Scalable @StreamdataIO

Rue Montorgueil, Paris 2e

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Continuous Delivery

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Aqueduct, Arcueil Reservoir, Arcueil

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Zoning

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Quarèr Panthéon, a zone dedicated to Our Big Men

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Lead by example

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Opera, an Hypermedia API > great UX > tracòn for API owners

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Cut Corners

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Cut corners vs straight corners: a design choice

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And x2 exemplar: conduct the most difficult transformaòns

Polyglot

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XVIII architecture encapsulated, if API complies

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SUSTAINABLE SYSTEMS? PARIS 160 YEARS LATER HTTP REST 16 YEARS LATER



UX performance: City of Lights


20m unique visitors a year

Reproductible

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Chicago aSer the Burnham Plan, designed in 1909

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Durable

Courneuve, 1986, 20y lifespan Monolith

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Evolvable

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Tour Eiffel under construcòn, evoluòn built years aSer Haussmann had leS office

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DAYTODAY LIFE IN A RESTFUL CITY


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Incomplete Protocol: Velib

Leverage reusable assets

Share same layer as existing traffic

But incomplete protocol: collisions, missing RFC

for cars

Rate-limited API, realtime difficult


Error Handling in your code

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Gare Montparnasse, 1895 –HTTP or REST does not prevent from good error handling, contrib @rit

HTTP//PARIS DICTIONARY, MAPS & RESSOURCES



Lost in Translation

Code Civil HTTP

Paris Web

Boulevards Internet Backbone

Streets Access Lines

Street Numbers URI

Light in the streets Authentication

Concierge Proxy

Cellar Cache

Carriage Request/Response

Subway/Metro Streaming

Homeworking Differential update over JSON Patch

Pierre de Carrière JSON

Compagnon du Devoir API Developer

Haussmann Architect

Beaux Arts Apple, Android and JS Developers

Façade API

Haussmann Façade RESTful API

Utilities (gas, water) Cloud/PaaS

Annonces Parisiennes Criteo

Grands Magasins Amazon

Opera Deezer

Theaters Netflix

Prefecture NSA

Bibliotheque Nat. Wiki

Senat W3C

Assemblee Nationale IETF

Louvre Pinterest

Bois de Boulogne MineCraft

Bois de Vincennes Facebook

Bon Marché Ebay

Eiffel Tower Twitter

Latin Quarter Udacity, Coursera MOOCs

Left bank spirit Android

Right bank spirit Apple iPhone


To go deeper

Paris Architecture & Urbanism: Musée Carnavalet, Cité Chaillot

Haussmann: Haussmann à Paris : Architecture et urbanisme Seconde moitié du XIXe siècle, Book, 2012

HTTP: Tim Berners-Lee & Team, Cern, 1990

REST: Network-Based Architecture Style, Thesis, Fielding 2000

Continuous Delivery : Farley & Humbl, 2010

Microservices : Microservices in a Nutshell, Fowler & Lewis, Thoughtworks, 2014

Web Corp Organization: How Google Works, Eric Schmidt, 2014

Design & UX : Jonathan Ive, Apple by The New Yorker, 2015

Microservices Building Microservices, Sam Newman, O’Reilly Book, 2015

Code Civil : on github by Steeve


To go deeper

UX/API articulation at Netflix : Dan Jacobson blog

API best practices:

Kin Lane APIEvangelist,

Jason Harmon,

ProgrammableWeb,

Mike Amundsen,

Steve Klabnik,

Mark O’Neill,

Runscope inc. Neill & Darrel ,

Guillaume Laforge, and many more
