Presentation of mu.semte.ch given at ESWC2016 workshop SALAD.

1. State-of-the-art Web Applications using
Microservices and Linked Data
Aad Versteden & Erika Pauwels
www.tenforce.com
yourdatastories.eu

2. What is mu.semte.ch?

10. We were able to reuse a lot :-)

11. Supported by yourdatastories.eu
- Integrating data sources
- Making investigative journalism easy
- Check http://yourdatastories.eu :)

12. Runs on Big Data Europe platform
Used by ESCO (& others)

13. How we think about it

14. Why did we build it?

15. Why did we build it?
- Personal projects
- Need code reuse
- Uncertain future (who will be the next big player)
- Change in web frontend landscape
- Change in web backend landscape
- Change in deployment landscape
- Need to roll your own

16. Many actors, one semantic model

19. Semantic model in mu.semte.ch
- Semantic model is the application’s domain
- Each microservice is an actor
- Integration is easy
- [FUTURE] Evaluate reasoning for complex or evolving applications

20. Automatic integration of services is awesome
… it is the bulk of what we explain to the un-indulged ...
… but you already know that ...
… give a taste of semantic technologies without a full buy-in.

21. Productivity is key

22. [Docker] Ease of installation & deployment
- Completely isolated environment (like a Virtual Machine)
- Automatic download & installation
books:
image: madnificent/books-service:1.0.0
links:
- db:database

23. [JSONAPI] Automatic communication with frontend
- Guidelines for REST resources on JSON APIs
- Limit discussion, point to jsonapi.org
{ "data": [{
"attributes": {
"name": "db",
"scaling": 1
},
"id": "ff9a62f3-6ecd-47da-95b1-aa310d29ffa5",
"type": "services",
"relationships": {
"pipeline": {
"links": { "self": "/services/ff9a62f3-6ecd-47da-95b1-aa310d29ffa5/links/pipeline-instance",
"related": "/services/ff9a62f3-6ecd-47da-95b1-aa310d29ffa5/pipeline-instance" }
}
}
}]}

24. - Make simple tasks simple
- Help follow best practices, don’t force
[Templates] Simple microservices
== Dockerfile ==
FROM semtech/mu-ruby-template:1.2.0-ruby2.1
MAINTAINER Aad Versteden <madnificent@gmail.com>
== web.rb ==
get '/:id/count' do
resp = query "
PREFIX votes: <http://mu.semte.ch/vocabularies/ext/votes/>
PREFIX mu: <http://mu.semte.ch/vocabularies/core/>
SELECT (COUNT(?user) AS ?votes)
WHERE { GRAPH <#{settings.graph}> {
?user votes:plusOne/mu:uuid "#{sparql_string params['id']}"
} } "
status 200
{ data: { attributes: { votes: resp.first["votes"].to_i } } }.to_json
end

25. [Templates] Extensible services
- Make simple tasks simple
- Help follow best practices, don’t force
(define-resource catalog ()
:class (s-prefix "dcat:Catalog")
:properties `((:title :string ,(s-prefix "dct:title"))
(:description :string ,(s-prefix "dct:description")))
:has-one `((publisher :via ,(s-prefix "dct:publisher")
:as "publisher"))
:has-many `((dataset :via ,(s-prefix "dcat:dataset")
:as "datasets"))
:resource-base (s-url "http://tenforce.com/catalogs/")
:on-path "catalogs")

26. - Some backend services have standard frontend components
- The road towards web components
- Not semantic
[Ember addons] Sharing frontend code
> ember install ember-mu-login
= application.hbs =
{{login-form}}

27. Ease mental model

28. - A step towards semantic applications
- Extensive sharing of code
- Encourages experimentation
- State-of-the-art frontend applications
- It’s just a step
In conclusion

29. <Thank You>
need more?
Erika Pauwels
- erika.pauwels@tenforce.com
- @ErikaPauwels
- http://github.com/erikap
- erika.pauwels@gmail.com
Aad Versteden
- aad.versteden@tenforce.com
- @impulsater
- http://github.com/madnificent
- madnificent@gmail.com
http://mu.semte.ch - http://tenforce.com - http://github.com/mu-semtech
This study was funded by yourdatastories.eu, as were parts of the microservices.