Presented at Tech2Days June 2015. Parallels between Code Civil/HTTP, REST/Haussmann-style façade, Microservices/Haussmann-Paris renovation into the City of Lights.

1. Network Based Architecture
Haussmann, Fielding, Fowler
HTTP, REST, Microservices
Eric Horesnyi
Tech2Day 2015
@StreamdataIO #Tech2Day

2. Realtime UX from any API
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3. Haussmann & Fielding
1853, Paris 2000, Irvine
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4. CHALLENGES IN PARIS IN 1853
Haussmann Fielding and Fowler
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5. Dropout
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Cholera, 1832 – 19,000 dropout
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6. Congestion
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1hab/sq mt density
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7. Slow & Unsecure
@StreamdataIO
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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8. 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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9. INHERITED FEATURES
Haussmann Fielding Fowler
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10. Inherited Properties
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11. DNS
.gov, .com and .fr follow
same scheme
Seine is .root
Streets start there
Right/even
Left/Uneven
@StreamdataIO
Paris street numbering, 1805
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12. Famous heritage
@StreamdataIO
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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13. Separation of concerns
@StreamdataIO
Client Server
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14. Stateless
@StreamdataIO
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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15. Stateless
@StreamdataIO
Client access server via a network call
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16. SELECTION OF PROPERTIES
FIELDING // HAUSSMANN
REST // PARIS
Haussmann Fielding Fowler
@StreamdataIO #Tech2Day

17. Mission
@StreamdataIO
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
#Tech2Day

18. 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)
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19. P1: Low-Entry Barrier
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A
popular
neighborhood
in
Paris
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20. P2: Extensibility
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Streaming
=
Paris
Metro/Subway,
1900
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21. P3: Distributed Hypermedia
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22. P4: Anarchic Scalability
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Paris
Metropole
today,
10m+
people
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23. P6: Independant Deployment
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Ile
de
La
Cité
restructured,
embedding
legacy/sacred
Notre
Dame
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24. WHY HAUSSMANN DECIDED TO
MAKE PARIS RESTFUL
Haussmann Fielding Fowler
@StreamdataIO #Tech2Day

25. REST=LCODC$SS&UI
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CSS=Client-Server-Stateless

26. Layer 1: sewage & gas
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27. Layer 2: street & boulevards
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28. Layer 3: roofs
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29. Layered Networks
Within a layer, a
component connects to
its neighboor
Between two layers,
gateways allow for
interaction
Each layer is
autonomous
@StreamdataIO #Tech2Day

30. Cache
@StreamdataIO
Le
Bon
Marché,
LeS
Bank
Grand
Magasin/Mall,
server
w/cache
#Tech2Day

31. Cache
@StreamdataIO
Opera,
a
server
with
cache
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32. Code On Demand
@StreamdataIO
Les
Halles,
seXng
the
tone
for
all
restaurants
in
the
City
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33. Uniform Interface = Genious
@StreamdataIO
Codified
UI,
by
floor
(header),
with
token/key,
proxy,
cache
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34. Uniformity = beauty inside
@StreamdataIO
Uniformity
in
APIs
brings
harmony
in
UX
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35. Uniformity = pattern beauty
@StreamdataIO
Uniformity
brings
fractal
harmony:
s`ll
there
from
a
distance
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36. HAUSSMANN URBANIST //
FOWLER
CONTINUOUS DELIVERY &
MICROSERVICES
Haussmann Fielding Fowler
@StreamdataIO #Tech2Day

37. Continuous Delivery
@StreamdataIO
Resilient
Water
Induc`on,
requiring
aqueducts
and
reservoirs
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38. Microservices
Not too big/high
Autonomous
components
Own API
Standard protocol
Scalable
@StreamdataIO
Rue
Montorgueil,
Paris
2e
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39. Continuous Delivery
@StreamdataIO
Aqueduct,
Arcueil
Reservoir,
Arcueil
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40. Zoning
@StreamdataIO
Quar`er
Panthéon,
a
zone
dedicated
to
Our
Big
Men
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41. Lead by example
@StreamdataIO
Opera,
an
Hypermedia
API
>
great
UX
>
trac`on
for
API
owners
#Tech2Day

42. Cut Corners
@StreamdataIO
Cut
corners
vs
straight
corners:
a
design
choice
#Tech2Day
And
x2
exemplar:
conduct
the
most
difficult
transforma`ons

43. Polyglot
@StreamdataIO
XVIII
architecture
encapsulated,
if
API
complies
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44. SUSTAINABLE SYSTEMS?
PARIS 160 YEARS LATER
HTTP REST 16 YEARS LATER
Haussmann Fielding Fowler
@StreamdataIO #Tech2Day

45. UX performance: City of Lights
@StreamdataIO #Tech2Day
20m
unique
visitors
a
year

46. Reproductible
@StreamdataIO
Chicago
aSer
the
Burnham
Plan,
designed
in
1909
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47. @StreamdataIO
Durable
Courneuve,
1986,
20y
lifespan
Monolith
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48. Evolvable
@StreamdataIO
Tour
Eiffel
under
construc`on,
evolu`on
built
years
aSer
Haussmann
had
leS
office
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49. DAYTODAY LIFE IN A RESTFUL
CITY
Haussmann Fielding Fowler
@StreamdataIO

50. 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
@StreamdataIO #Tech2Day

51. Error Handling in your code
@StreamdataIO
Gare
Montparnasse,
1895
–HTTP
or
REST
does
not
prevent
from
good
error
handling,
contrib
@rit

52. HTTP//PARIS
DICTIONARY, MAPS &
RESSOURCES
Haussmann Fielding Fowler
@StreamdataIO #Tech2Day

53. 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 MagasinsAmazon
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
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54. 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
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55. 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
@StreamdataIO #Tech2Day