mu.semte.ch, a framework for building microservices-powered applications on top of Linked Data, presented from TenForce's perspective. This presentation was given at Semantics2016.

1. mu.semte.ch
a journey from
TenForce’s perspective

2. In 60 seconds
State-of-the-art web applications fuelled by Linked Data aware microservices
- User-facing microservices
- Easy deployment using Docker
- Single Page Apps using Ember.js
- Well known requirements
=> [HTTP+JSON+SPARQL]
https://github.com/mu-semtech/
https://mu.semte.ch

3. Some history
Share code on personal projects
Rails is not über-productive
Stay light, choose later
Use microservices and semantic model

4. KISS
Keep It Super Simple

5. KISS
- Most of us aren’t microservice experts
- Most of us aren’t UI experts
- We need to get stuff done
- Maximize freedom
- Orthogonal features
- Minimize requirements

6. Simple mental model
user-facing http-services

7. Simple mental model
User-facing microservices
Limit base technologies:
- HTTP
- JSON(API)
- SPARQL (one graph)

8. Simple mental model
TenForce supports publishing of open data.
- Use DCAT standard
- EDCAT 2.0 released
- mudCAT = back-end
- webCAT = front-end
- Custom configurations to match
specific customer needs.

9. webCAT

10. Semantic models
Many actors, telling parts of the same story

11. Semantic models
Services read/write the part of the world they understand.
User Registration:
- There’s a new user => add it to the triplestore.
User Login:
- Check username/password => connect user to current session.

12. Semantic models
Registration
service
Login service

13. Semantic models
Many implementations, one model
Same model for:
- Username/Password login
- OAuth login
- ECAS login

14. Semantic models
We use the ECAS login for ESCO-related projects.
ESCO is a taxonomy of all Skills Competences and Occupations in Europe.
The Dacota team finds and classifies content. Brains for hire!

15. http://dacota.one

16. Docker
Deployment made easy

17. Docker Container =~ Lightweight Linux Virtual Machine
Docker Compose =~ Topology of multi-container project
Each service runs in its own Docker Container
In short:
- Simple hosting on hub.docker.com
- Clean project description
- Always works
- Runs on the Big Data Europe Platform
Share using Docker

18. Share using Docker
We are part of Big Data Europe
Making Big Data:
- Easy to get started
- Cheaper to maintain
… in any domain
- Now including Smart Big Data:
=> Semantics + Big Data = <3

19. Reuse everything

20. Reuse everything
- Templates: basics for a service
- Configurable services
- mu-cl-resources
- Ember add-ons
- Hierarchy service + add-on
- Login service + add-on

21. Base templates
CatalogsIndexRoute = Ember.Route.extend
ajax: Ember.inject.service()
model: () ->
@get('ajax').request('/hello')
Hello result: {{model.value}}
get '/hello/' do
counter = query( "SELECT COUNT (*) as ?counter" +
"WHERE {" +
" ?s ?p ?o." +
"}" ).first[:counter].to_i
status 200
{ value: counter }.to_json
end
FROM semtech/mu-ruby-template:2.0.0-ruby2.3
MAINTAINER Your Name <you@provider.com>
demo:
image: you/demo-service
links:
- db:database
dispatcher:
…
links:
- demo:demo
match "/hello/*path" do
Proxy.forward conn, path, "http://demo/hello/"
end
[mu-ruby-template]

22. Base templates [mu-ruby-template]

23. Configurable services
(define-resource distribution ()
:class (s-prefix "dcat:Distribution")
:properties `((:title :string ,(s-prefix "dct:title"))
(:description :string ,(s-prefix "dct:description"))
(:issued :string ,(s-prefix "dct:issued"))
(:modified :string ,(s-prefix "dct:modified"))
(:license :string ,(s-prefix "dct:license"))
(:rights :string ,(s-prefix "dct:rights"))
(:access-url :string ,(s-prefix "dcat:accessURL"))
(:download-url :string ,(s-prefix
"dcat:downloadURL")))
:has-one `((dataset :via ,(s-prefix "dcat:distribution")
:inverse t
:as "dataset")
(format :via ,(s-prefix "dct:format")
:as "format"))
:resource-base (s-url "http://your-data-stories.eu/distributions/")
:on-path "distributions")
[mu-cl-resources]
Full JSONAPI from abstract description

24. Configurable services [mu-cl-resources]

25. Ember add-ons
> ember install ember-async-expanding-tree
{{async-expanding-tree model=topNode config=customConfig}}
config:
labelPropertyPath: 'label'
getChildren: (model) ->
children = Ember.ajax("/hierarchy/" +
"#{@get('hierarchyId')}" +
"/target/#{model.get('id')}")
showMaxChildren: 50
includeLeafs: true
hierarchy:
image: tf-esco/hierarchy:1.2.3
links:
- db:database
dispatcher:
…
links:
- hierarchy:hierarchy
match "/hierarchy/*path" do
Proxy.forward conn, path, "http://hierarchy/"
end
[hierarchy-service]

26. Ember add-ons [hierarchy-service]

27. What we learned

28. What we learned
- Extremely productive
- Code reuse
- Easy for juniors
- Customers like front-end
- Database performance is okayish

29. About the future

30. Trigger microservices by changes in
semantic model.
Example:
- Compute KPIs when a new dataset is added
- Send email/tweet by writing it to the triplestore
Reactive programming

31. More performance
- ember-fastboot:
Faster first page render
- mu-cache:
Smart caching strategies
in core microservices
- mu-cl-resources:
Partial resource caching

32. More authority
Describe authorization outside the microservices:
- Simplify mental model
- Help in sharing content
- Open gate to advanced
applications
search for Jonathan Langens if you want to know more

33. More interactivity
Push cache updates to all visiting clients.
Almost no development time to create
basic interactive applications
(eg: updating KPIs, chat applications, …)

34. More links

35. Lego Time Star Wars: https://www.flickr.com/photos/eurobricks-starwars/5223334274/in/photolist-8XyXiu-7BJ9Xp-c2btBw-davQBK- nAQJCC-9XVSZs-
a3vVhy-vPZaHw-r6NB6c-4ajSXh-rX7ezA-BBhAWf-BiWDpc-rED79Q-rX7f8u-mtctqc-wtp245-fcNzVb-CgXNsA-D4Uxps-wKj5u9-rX7fVm- rUWnBU-uhC54v-rXeB4g-
zVknPq-qxEqXx-8GSCNc-nzg79j-biFNa6-9fXjwV-biFMTa-a1kbsX-5HnKDa-dQCdnW-a54g8X-bm9TRN-8zJUzU-fbGRan-sdr4hw- e9DMFz-q3qQqf-aAZwyV- bm9Tsw-
dQCdpb-sdpUWU-rkow4K-wazJmK-bz4Md8-pyU2QM Wendelstein 7X: http://www.sciencemag.org/news/2015/10/ bizarre-reactor-might-save- nuclear-
fusion 300SL: https://www.flickr.com/photos/smfan/7181631212/in/photolist-bWBJKN-o52kEN- 5pCCRH-6NezBh-oF2nYm-gHtRrE-6KAHDv-cPKKj9-2aj2ur-
s3A8ua-5pH14j-bQk48B-omejVV-q2tAx7-o8yCtS-nRauVz-5pCNWB-o525H4-o9dqig-sk2we8- o4EApo-N2NDc-o7jxQM-5pCG4c-81DnQh-exNBvp-kc9m4-exS223-cm2nm5-
aPXHgc-7Tg5XD-6HQ5Q9-6w1JtR-5pCGWi-eb6dJe-pJYFdi-azFSaU-p5y4mb- 6GjCy2-q2kGp6-o52baX-9XtXDc-4GqX86-pJXbk1-8canak-q2tu1j-6HQ6eo-sjZQkD-
dhaPyf-bBqucA http://www.quickmeme.com/meme/3stqet Big Data Europe: https://www.big-data-europe.eu/ Docker Logo:
http://www.silicon.de/41608942/microsoft-optimiert-windows-server-2016-fuer-die- cloud/ webCAT: https://github.com/tenforce/webcat Banksy
Van: http://artcentron.com/2016/06/22/banksy-graffiti-art-swat-van-sale/ #prettyPhoto Banksy Bananas:
https://www.touchofmodern.com/sales/banksy-8a9ea26d-040f-4435-ada1-86e7a6b4a05c/pulp-fiction-bananas Your Data Stories platoform:
http://platform.yourdatastories.eu/ Star Wars Clones box: https://www.flickr.com/photos/kalexanderson/ 5410769283/in/photolist-9f8Bcz-
5SJTDj-55MnH2-4WEfzr-in3p6t-drf7fp-3b46gb-bKfRW4-3aYzBt-4xztdx-35E11y-9jVQVR-9wuv3f-9r3mWe-9hNTVz- 7JzMxg-7JYZFM-Hw1QSq-8FW8eh-nVj9Sc-
8ytJvH-aPPKYz-dYyYWK-7fhBFE-7GgZYm-e5M9jV-bwm6S9-7fhyGd-e5SNkL-5LDPWB-e5SNdf-4MKWht-e5SLrb- 5zPWDw-74Yjyb-8xh5Vr-9Apdwp-4XUn5j-jSHfRS-
9fAZ86-eueiqp-e5SPwu-e5MbcZ-9tJQdd- 5f4rJT-9HsoqF-9hud4U-e5MaQX-52mMrQ-e5M9WX/ GitHub Logo: https://blog.adafruit.com/2012/12/31/github-
has-big-dreams-for- open-source-software-and-more/ Twitter Logo: https://en.wikipedia.org/wiki/File:Twitter_bird_logo_2012.svg mu-ruby-
template: https://github.com/mu-semtech/mu-ruby-template mu-cl-resources: https://github.com/mu-semtech/mu-cl-resources mu-project:
https://github.com/mu-semtech/mu-project
Resources used & interesting links

36. More questions
right now, or ask later

37. Erika Pauwels
erika.pauwels@gmail.com
erikap
@ErikaPauwels
http://mu.semte.ch
http://github.com/mu-semtech
Aad Versteden
madnificent@gmail.com
aad.versteden@tenforce.com
madnificent
@impulsater
http://www.tenforce.com http://dacota.one http://big-data-europe.eu
Come talk to us