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

The Road to REST One link at a time Rickard Öberg, 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 Tunnelling – Many URIs, Single verb Level 2 Many URIs, many verbs CRUD services (e.g. Amazon S3) Level 3 Level 2 + Hypermedia – RESTful Services
REST to the rescue! “Representational State Transfer (REST) is a style of software architecture for distributed hypermedia systems such as the World Wide Web”
  Guidelines Client–server Stateless Cacheable Layered system Uniform interface http://en.wikipedia.org/wiki/Representational_State_Transfer#Constraints
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)
The narrow road
What shall we expose? Client Data Server
What shall we expose? Client Domain model Server
How? Servlets? JAX-RS? Restlet www.restlet.org
What the...? /users/rickard/changepassword /users/rickard/resetpassword
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
What now?!?
One step at a time
What shall we expose? Client Use cases Server
From the user perspective /account/changepassword /administration/server/users/rickard/resetpassword
Who can do what? /workspace/cases/<123>/ /administrator/... /overview/...
Follow the named link Links Link Query Command REST API
Application flow GET ..../index GET <link with rel="possiblelabels"> addlabel?id=1234, rel=addlabel, "Urgent!" POST the link
Link checking What can the user do? Check for links!
Wohoo!
Versioning HATEOAS helps Exposing use cases helps Send header Ex. X-STREAMFLOW-API: 1.2 Client libraries
Performance Exposing use cases really helps Use e.g. GQL for table queries Client decides columns and filtering from fixed set
TL;DL A Good REST API is like an ugly website RESTful clients should follow links and submit forms
Q & A rickard.oberg@neotechnology.com @rickardoberg http://rickardoberg.wordpress.com http://qi4j.org

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