Mijn presentatie over REST en Beans in een IBM Domino XPages omgeving, van het XPages & Beer evenement op 12 december 2012.

1. Of REST and Beans
Door Thimo Jansen

2. Introductie
* Thimo Jansen
* IBM Domino web developer
* http://www.thimojansenit.nl

3. Agenda
* REST
* JSON
* Architectuur
* Demo
* Code

4. REST

5. REST // Definitie
Representational State Transfer
A set of recommended architectural
constraints in order for a system to be
described as RESTful
Door Roy Fielding, ook HTTP 1.0 en 1.1

6. REST // Constraints
* Client - Server
* Stateless
* Cacheable
* Layered system
* Code on demand
* Uniform interface

7. REST // Communicatie
Data uitwisseling
Client doet weergave
Server doet opslag

8. REST // Communicatie
Via HTTP
* GET - Ophalen
* POST - Aanmaken
* PUT - Vervangen
* DELETE - Verwijderen
Lijkt op CRUD

9. JSON

10. JSON // Definitie
JavaScript Object Notation
* lightweight text-data interchange
* taal onafhankelijk
* "self-describing", easy to understand

11. JSON // Voorbeeld
Object:
{
"firstName":"John",
"lastName":"Doe"
}

12. JSON // Voorbeeld
Array:
[
100, 200, 300
]

13. JSON // Voorbeeld
Array met twee objecten:
[
{"firstName":"John", "lastName":"Doe"},
{"firstName":"Hello", "lastName":"World"}
]

14. JSON // Voorbeeld
Object met arrays en objecten:
{
"event":"XPages & Beer",
"location":"Houten",
"speakers" : [
{"firstName":"Tom", "lastName":"Steenbergen"},
{"firstName":"Thimo", "lastName":"Jansen"},
{"firstName":"Erik", "lastName":"van der Arend"}
]
}
(Syntax: http://www.json.org/, JSON Validator: http://jsonlint.com/)

15. JSON // Conversie
Javascript -> JSON
XPages: toJson(myObject);
Browser: JSON.stringify(myObject);

16. JSON // Conversie
JSON -> Javascript
var myJSON = '{"firstName":"John", "lastName":"Doe"}';
XPages: fromJson(myJSON);
Browser: JSON.parse(myJSON);

17. JSON // Conversie
Test of iets JSON is
XPages: isJson('{<some JSON string>}');

18. JSON vs REST
JSON != Hypermedia
JSON != REST
Ja, en?
http://norestforjson.blogspot.nl/2012/08/json-is-not-restful.html
http://roy.gbiv.com/untangled/2008/rest-apis-must-be-hypertext-driven

19. Architectuur

20. Architectuur // HTML
Browser
Request Response
GET/POST HTML
Web server
Application logic (SSJS, Beans)

21. Architectuur // REST
Browser
AJAX Request
Request Response Response
GET/POST/PUT/
GET/POST HTML JSON
DELETE
Web server
Application logic (SSJS, Beans)

22. Architectuur // REST
Browser
AJAX Request Response
Request Response
GET/POST/PUT/ JSON
GET/POST HTML
DELETE
Web server Web server
Application logic Application logic

23. Demo

24. Code

25. Contact
thimo@jansenit.nl // @thimo
http://blog.thimojansenit.nl
http://linkedin.com/in/thimojansen