Applying Evolutionary Architecture on a Popular API

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Phil Calçado

Tecnología

Applying Evolutionary
Architecture on a
Popular API
phil calçado
@pcalcado
http://philcalcado.com

QCon London Session Code: 1603
Wednesday, March 6, 13

> 50K registered
client apps
~ 180 million users / month
~5 years old

Wednesday, March 6, 13

API controllers UI controllers

domain logic

Wednesday, March 6, 13

http://bit.ly/building-the-next-soundcloud

Wednesday, March 6, 13

UI controllers

internet

API controllers

domain logic

Wednesday, March 6, 13

a new platform while
keeping the old one
running?

Wednesday, March 6, 13

WARNING:
THIS IS
WORK IN PROGRESS
and you can help us ;)
http://bit.ly/work-at-soundcloud

Wednesday, March 6, 13

DO NOT BREAK
CLIENT APPS

Wednesday, March 6, 13

separate
application
from domain

Wednesday, March 6, 13

Classic Next
SoundCloud SoundCloud

A set is a A set is a
collection of collection of
your own your own
sounds sounds

Wednesday, March 6, 13

Classic Next
SoundCloud SoundCloud

A set is a A set is a
collection of collection of
your own your own
sounds sounds
SoundCloud
API
A set is a
collection of
sounds
Wednesday, March 6, 13

UI controllers

internet

API controllers

domain logic domain logic domain logic

Wednesday, March 6, 13

applications enforce their
own business rules

domain enforces “global”
rules

Wednesday, March 6, 13

applications enforce their
own business rules

domain enforces “global”
rules

(accidents happen...)
Wednesday, March 6, 13

how to add/change
features on the fly?

Wednesday, March 6, 13

attempt #1:
identify “official” apps

- too easy to spoof
- abused by spammers
- Android and iOS can’t easily
rotate secrets

Wednesday, March 6, 13

attempt #2:
namespace endpoints

- “experimental” endpoints
would link to regular ones but
never be linked back
- toyed with “lifted”
hyperlinks, not enough time
for launch
Wednesday, March 6, 13

attempt #3:
just use feature flags
- works ok for logged in users

- system is a little monster
now, and ruby is not very
good with numbers. rewriting
in scala

Wednesday, March 6, 13

SPLITTING THE
MOTHERSHIP

Wednesday, March 6, 13

define internal protocols

Wednesday, March 6, 13

micro-services
- couple thousands lines of code

- mostly JVM-based, JRuby, Clojure
and Scala

- more about this at the SoundCoud
pub night tomorrow: http://
lanyrd.com/2013/soundcloudpub/
(Walrus Pub Waterloo)
Wednesday, March 6, 13

HTTP+JSON & AMQP
for most stuff
- moving AMQP usage for
event broadcasting, as
opposed to messaging

- no internal HTTP caching
(yet?)

Wednesday, March 6, 13

make it easy to get stuff in
prod

- heroku-like deployment
system

- tending towards twitter
stack (Finagle) for I/O

Wednesday, March 6, 13

URNs, not IDs

soundcloud:sounds:123

Wednesday, March 6, 13

URNs, not IDs
- everything addressable has
a URN, some have URLs

- Mapping depends on
context, e.g. given object may
have a public URL and an
internal URL
Wednesday, March 6, 13

<3 hypermedia

- can easily remove things
from the main app without
breaking clients, just some
HTTP 303s

Wednesday, March 6, 13

OPTIMISE ALL
THE THINGS!!11!

Wednesday, March 6, 13

twitter moving back to
server rendering...?

Wednesday, March 6, 13

not too bad, actually

- besides load balancers vs.
increase in number of
requests per page

http://backstage.soundcloud.com/2012/08/evolution-of-soundclouds-
architecture/
Wednesday, March 6, 13

the actual problems
- number of requests from
Next keeps increasing, page
load affected
- very different behaviour
depending on the client app

Wednesday, March 6, 13

UI controllers

internet

API controllers

Wednesday, March 6, 13

attempt #1:
optmising proxy for clients
UI controllers

internet

Proxy

API controllers

domain logic domain logic domain logic

Wednesday, March 6, 13

attempt #1:
optmising proxy for clients

- still leverage public API
- API has to know about how
things behave in different
clients

Wednesday, March 6, 13

attempt #2:
specialised back-end for official
clients
UI controllers

internet

Specialised
API controllers
Back-end

domain logic domain logic domain logic

Wednesday, March 6, 13

attempt #2:
specialised back-end for official
clients
- each official app has its own back-
end facade
- no rendering, just data
- public API becomes just one of
them
- front-end heavy teams can just
script a common core using JRuby
Wednesday, March 6, 13

what we are looking at

- dataflow programming for the
specialised back-ends

- ProtocolBuffers for Android

- make the mothership just a back-
end service, not exposed to the
Internet

Wednesday, March 6, 13

phil calçado

http://philcalcado.com
@pcalcado

www.soundcloud.com

Wednesday, March 6, 13

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Angeliki Cooney has spent over twenty years at the forefront of the life sciences industry, working out of Wynantskill, NY. She is highly regarded for her dedication to advancing the development and accessibility of innovative treatments for chronic diseases, rare disorders, and cancer. Her professional journey has centered on strategic consulting for biopharmaceutical companies, facilitating digital transformation, enhancing omnichannel engagement, and refining strategic commercial practices. Angeliki's innovative contributions include pioneering several software-as-a-service (SaaS) products for the life sciences sector, earning her three patents. As the Senior Vice President of Life Sciences at Avenga, Angeliki orchestrated the firm's strategic entry into the U.S. market. Avenga, a renowned digital engineering and consulting firm, partners with significant entities in the pharmaceutical and biotechnology fields. Her leadership was instrumental in expanding Avenga's client base and establishing its presence in the competitive U.S. market.

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When you’re building (micro)services, you have lots of framework options. Spring Boot is no doubt a popular choice. But there’s more! Take Quarkus, a framework that’s considered the rising star for Kubernetes-native Java. It always depends on what's best for your situation, but how to choose the best solution if you're comparing 2 frameworks? Both Spring Boot and Quarkus have their positives and negatives. Let us compare the two by live coding a couple of common use cases in Spring Boot and Quarkus. After this talk, you’ll be ready to get started with Quarkus yourself, and know when to select Quarkus or Spring Boot.

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The microservices honeymoon is over. When starting a new project or revamping a legacy monolith, teams started looking for alternatives to microservices. The Modular Monolith, or 'Modulith', is an architecture that reaps the benefits of (vertical) functional decoupling without the high costs associated with separate deployments. This talk will delve into the advantages and challenges of this progressive architecture, beginning with exploring the concept of a 'module', its internal structure, public API, and inter-module communication patterns. Supported by spring-modulith, the talk provides practical guidance on addressing the main challenges of a Modultith Architecture: finding and guarding module boundaries, data decoupling, and integration module-testing. You should not miss this talk if you are a software architect or tech lead seeking practical, scalable solutions. About the author With two decades of experience, Victor is a Java Champion working as a trainer for top companies in Europe. Five thousands developers in 120 companies attended his workshops, so he gets to debate every week the challenges that various projects struggle with. In return, Victor summarizes key points from these workshops in conference talks and online meetups for the European Software Crafters, the world’s largest developer community around architecture, refactoring, and testing. Discover how Victor can help you on victorrentea.ro : company training catalog, consultancy and YouTube playlists.

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Corporate and higher education. Two industries that, in the past, have had a clear divide with very little crossover. The difference in goals, learning styles and objectives paved the way for differing learning technologies platforms to evolve. Now, those stark lines are blurring as both sides are discovering they have content that’s relevant to the other. Join Tammy Rutherford as she walks through the pros and cons of corporate and higher ed collaborating. And the challenges of these different technology platforms working together for a brighter future.

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Rustici Software

Applying Evolutionary Architecture on a Popular API

1. Wednesday, March 6, 13

2. Applying Evolutionary Architecture on a Popular API phil calçado @pcalcado http://philcalcado.com QCon London Session Code: 1603 Wednesday, March 6, 13

3. Wednesday, March 6, 13

4. Wednesday, March 6, 13

5. > 50K registered client apps ~ 180 million users / month ~5 years old Wednesday, March 6, 13

6. Wednesday, March 6, 13

7. API controllers UI controllers domain logic Wednesday, March 6, 13

8. http://bit.ly/building-the-next-soundcloud Wednesday, March 6, 13

9. API controllers UI controllers domain logic Wednesday, March 6, 13

10. UI controllers internet API controllers domain logic Wednesday, March 6, 13

11. a new platform while keeping the old one running? Wednesday, March 6, 13

12. WARNING: THIS IS WORK IN PROGRESS and you can help us ;) http://bit.ly/work-at-soundcloud Wednesday, March 6, 13

13. DO NOT BREAK CLIENT APPS Wednesday, March 6, 13

14. separate application from domain Wednesday, March 6, 13

15. Classic Next SoundCloud SoundCloud A set is a A set is a collection of collection of your own your own sounds sounds Wednesday, March 6, 13

16. Classic Next SoundCloud SoundCloud A set is a A set is a collection of collection of your own your own sounds sounds SoundCloud API A set is a collection of sounds Wednesday, March 6, 13

17. UI controllers internet API controllers domain logic Wednesday, March 6, 13

18. UI controllers internet API controllers domain logic domain logic domain logic Wednesday, March 6, 13

19. applications enforce their own business rules domain enforces “global” rules Wednesday, March 6, 13

20. applications enforce their own business rules domain enforces “global” rules (accidents happen...) Wednesday, March 6, 13

21. how to add/change features on the fly? Wednesday, March 6, 13

22. attempt #1: identify “official” apps - too easy to spoof - abused by spammers - Android and iOS can’t easily rotate secrets Wednesday, March 6, 13

23. attempt #2: namespace endpoints - “experimental” endpoints would link to regular ones but never be linked back - toyed with “lifted” hyperlinks, not enough time for launch Wednesday, March 6, 13

24. attempt #3: just use feature flags - works ok for logged in users - system is a little monster now, and ruby is not very good with numbers. rewriting in scala Wednesday, March 6, 13

25. SPLITTING THE MOTHERSHIP Wednesday, March 6, 13

26. define internal protocols Wednesday, March 6, 13

27. micro-services - couple thousands lines of code - mostly JVM-based, JRuby, Clojure and Scala - more about this at the SoundCoud pub night tomorrow: http:// lanyrd.com/2013/soundcloudpub/ (Walrus Pub Waterloo) Wednesday, March 6, 13

28. HTTP+JSON & AMQP for most stuff - moving AMQP usage for event broadcasting, as opposed to messaging - no internal HTTP caching (yet?) Wednesday, March 6, 13

29. make it easy to get stuff in prod - heroku-like deployment system - tending towards twitter stack (Finagle) for I/O Wednesday, March 6, 13

30. URNs, not IDs soundcloud:sounds:123 Wednesday, March 6, 13

31. URNs, not IDs - everything addressable has a URN, some have URLs - Mapping depends on context, e.g. given object may have a public URL and an internal URL Wednesday, March 6, 13

32. <3 hypermedia - can easily remove things from the main app without breaking clients, just some HTTP 303s Wednesday, March 6, 13

33. OPTIMISE ALL THE THINGS!!11! Wednesday, March 6, 13

34. twitter moving back to server rendering...? Wednesday, March 6, 13

35. not too bad, actually - besides load balancers vs. increase in number of requests per page http://backstage.soundcloud.com/2012/08/evolution-of-soundclouds- architecture/ Wednesday, March 6, 13

36. the actual problems - number of requests from Next keeps increasing, page load affected - very different behaviour depending on the client app Wednesday, March 6, 13

37. UI controllers internet API controllers domain logic domain logic domain logic Wednesday, March 6, 13

38. UI controllers internet API controllers Wednesday, March 6, 13

39. attempt #1: optmising proxy for clients UI controllers internet Proxy API controllers domain logic domain logic domain logic Wednesday, March 6, 13

40. attempt #1: optmising proxy for clients - still leverage public API - API has to know about how things behave in different clients Wednesday, March 6, 13

41. attempt #2: specialised back-end for official clients UI controllers internet Specialised API controllers Back-end domain logic domain logic domain logic Wednesday, March 6, 13

42. attempt #2: specialised back-end for official clients - each official app has its own back- end facade - no rendering, just data - public API becomes just one of them - front-end heavy teams can just script a common core using JRuby Wednesday, March 6, 13

43. NEXT STEPS Wednesday, March 6, 13

44. what we are looking at - dataflow programming for the specialised back-ends - ProtocolBuffers for Android - make the mothership just a back- end service, not exposed to the Internet Wednesday, March 6, 13

45. phil calçado http://philcalcado.com @pcalcado www.soundcloud.com Wednesday, March 6, 13

Applying Evolutionary Architecture on a Popular API

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