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The Road to REST One link at a time Rickard berg, Neo Technology - PowerPoint PPT Presentation

Jan 28, 2024 •570 likes •861 views

The Road to REST One link at a time Rickard berg, Neo Technology QCon code: 7817 How it all began The Mission A fork in the road RMI? SOAP? REST? Exploring Richardson Maturity model Level 0 SOAP , XML RPC, POX Single URI Level 1 URI

  1. The Road to REST One link at a time Rickard Öberg, Neo Technology QCon code: 7817

  2. How it all began

  3. The Mission

  4. A fork in the road RMI? SOAP? REST?

  5. Exploring

  6. Richardson Maturity model Level 0 SOAP , XML RPC, POX – Single URI Level 1 URI Tunnelling – Many URIs, Single verb Level 2 Many URIs, many verbs CRUD services (e.g. Amazon S3) Level 3 Level 2 + Hypermedia – RESTful Services

  7. REST to the rescue! “Representational State Transfer (REST) is a style of software architecture for distributed hypermedia systems such as the World Wide Web”

  8. 
 Guidelines Client–server Stateless Cacheable Layered system Uniform interface http://en.wikipedia.org/wiki/Representational_State_Transfer#Constraints

  9. More guidelines Identification of resources Manipulation of resources through these representations Self-descriptive messages H ypermedia A s T he E ngine O f A pplication S tate (HATEOAS)

  10. The narrow road

  11. What shall we expose? Client Data Server

  12. What shall we expose? Client Domain model Server

  13. How? Servlets? JAX-RS? Restlet www.restlet.org

  14. What the...? /users/rickard/changepassword /users/rickard/resetpassword

  15. Where is HATEOAS?!? “The next control state of an application resides in the representation of the first requested resource, … The application state is controlled and stored by the user agent … anticipate changes to that state (e.g., link maps and prefetching of representations) … The model application is therefore an engine that moves from one state to the next by examining and choosing from among the alternative state transitions in the current set of representations .” - Roy Fielding

  16. What now?!?

  17. One step at a time

  18. What shall we expose? Client Use cases Server

  19. From the user perspective /account/changepassword /administration/server/users/rickard/resetpassword

  20. Who can do what? /workspace/cases/<123>/ /administrator/... /overview/...

  21. Follow the named link Links Link Query Command REST API

  22. Application flow GET ..../index GET <link with rel="possiblelabels"> addlabel?id=1234, rel=addlabel, "Urgent!" POST the link

  23. Link checking What can the user do? Check for links!

  24. Wohoo!

  25. Versioning HATEOAS helps Exposing use cases helps Send header Ex. X-STREAMFLOW-API: 1.2 Client libraries

  26. Performance Exposing use cases really helps Use e.g. GQL for table queries Client decides columns and filtering from fixed set

  27. TL;DL A Good REST API is like an ugly website RESTful clients should follow links and submit forms

  28. Q & A rickard.oberg@neotechnology.com @rickardoberg http://rickardoberg.wordpress.com http://qi4j.org

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