Introducing REST
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  • 1. Introducing REST Dong Liu Dept. of Computer Science Univ. of Saskatchewan dong.liu@usask.ca http://blogs.usask.ca/dong_notes/
  • 2. Agenda What is REST RESTful services Comparing RESTful and SOAP-based approaches Useful resources Jan. 8 2008 Dong Liu
  • 3. REST Representational State Transfer The term comes from Roy Fielding’s PhD work More practical than theoretical It is an architectural style, not a technology, nor an architecture Software architecture = {Elements, Constraints, Rationale} * An architectural style abstracts elements and constraints from various specific architectures * Analogy: designs and design pattern * Perry & Wolf quot;Foundations for the study of software architecture,quot; SIGSOFT Softw. Eng. Notes. ACM, vol. 17, pp. 40-52, 1992. Jan. 8 2008 Dong Liu
  • 4. Deriving REST RR: replicated repository from Roy T. Fielding quot;Architectural styles and the design of network-based software architectures,quot; University of California, Irvine, 2000. $: cache CS: client-server LS: layered system S: stateless VM: virtual machine COD: code on demand U: uniform interface Jan. 8 2008 Dong Liu
  • 5. Uniform interface Resources are identified by ONE resource identifier mechanism Access methods are the same for all resources Resources are manipulated by exchanging representations Representations are in self-descriptive messages Hypermedia acts as the engine of application state Jan. 8 2008 Dong Liu
  • 6. REST rationale Maximize reuse Minimize coupling Eliminate partial failure condition Scale without bound Simplify from Roy T. Fielding quot;The Rest of REST,quot; RailsConf Europe, 2007. Jan. 8 2008 Dong Liu
  • 7. Generic process to design RESTful services 1. Identify resources 2. Design URIs 3. Expose a subset of the uniform interface 4. Design the representations from and to the client 5. Integrate this resource into existing resources, using hypermedia links and forms 6. Consider typical flows 7. Consider error conditions A revised version of P216 in Leonard Richardson & Sam Ruby quot;RESTful Web Services,quot; O'Reilly, 2007. Jan. 8 2008 Dong Liu
  • 8. RESTful design of del.icio.us services (1) The example comes from Leonard Richardson & Sam Ruby quot;RESTful Web Services,quot; O'Reilly, 2007. Jan. 8 2008 Dong Liu
  • 9. RESTful design of del.icio.us services (2) Jan. 8 2008 Dong Liu
  • 10. RESTful design of del.icio.us services (3) Jan. 8 2008 Dong Liu
  • 11. WS stack from http://www.innoq.com/resources/ws-standards-poster/ Jan. 8 2008 Dong Liu
  • 12. Interoperability? Support for the Basic Profile is the baseline for interoperable Web services. from http://www.ws-i.org/Default.aspx Customers should demand that all of their Web services-enabled technology be compliant with the Basic Profile, and that in turn will lay the foundation for Web services to fulfill their promise and provide technology independent interoperability. Dan Sholler, Gartner Jan. 8 2008 Dong Liu
  • 13. WS-Babel from http://www.flickr.com/photos/psd/1805565187/in/set-72157602805227511/ Jan. 8 2008 Dong Liu
  • 14. WS-Addressing from http://www.flickr.com/photos/psd/406077535/in/set-72157602131510927/ Jan. 8 2008 Dong Liu
  • 15. Jan. 8 2008 The Web is agreement Dong Liu from http://www.archive.org/details/TheWebIsAgreement
  • 16. Two must-read’s Jan. 8 2008 Dong Liu
  • 17. The community Yahoo rest-discuss group Steve Vinoski Paul Downey Sam Ruby Bill de hÓra Joe Gregorio Mark Nottingham Pete Lacey Stefan Tilkov Stuart Charlton Mark Baker … Jan. 8 2008 Dong Liu
  • 18. Thanks