Silvia Schreier - Chair of Data Processing Technology

University of Hagen - Faculty of Mathematics and Computer Science

Modeling RESTful applications

Silvia Schreier

University of Hagen - Faculty of Mathematics and Computer Science

3/30/11 Silvia Schreier - Chair of Data Processing Technology Slide 2

Problems during development

§  Many frameworks for implementation support §  Concentration on technical details instead of design §  Lack of support for early phases §  No (standardized) design language §  A lot of natural language, e.g. best practices and patterns §  No model-driven development / code generation possible

§  Possible solution: a REST metamodel

Intention: discussing the current version

University of Hagen - Faculty of Mathematics and Computer Science

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Metamodeling

§  Abstract Syntax: possible elements and their relations §  Vocabulary

§  Static Semantic: constraints for well-formed models §  Grammar

§  Concrete Syntax: textual or visual language

University of Hagen - Faculty of Mathematics and Computer Science

3/30/11 Silvia Schreier - Chair of Data Processing Technology Slide 4

Example: Web album

§  Albums §  (excellent) Pictures §  Excellent pictures can be suggested and must be reviewed

University of Hagen - Faculty of Mathematics and Computer Science

3/30/11 Silvia Schreier - Chair of Data Processing Technology Slide 5

REST metamodel

Elements and their relations

How does the application react

to requests?

University of Hagen - Faculty of Mathematics and Computer Science

3/30/11 Silvia Schreier - Chair of Data Processing Technology Slide 6

Structural Model – ResourceTypes

University of Hagen - Faculty of Mathematics and Computer Science

3/30/11 Silvia Schreier - Chair of Data Processing Technology Slide 7

Structural Model – Overview

University of Hagen - Faculty of Mathematics and Computer Science

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Structural Model – Example

University of Hagen - Faculty of Mathematics and Computer Science

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Behavioral Model

University of Hagen - Faculty of Mathematics and Computer Science

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Behavioral Model – Example §  States of Suggestion

University of Hagen - Faculty of Mathematics and Computer Science

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Conclusion

in future

University of Hagen - Faculty of Mathematics and Computer Science

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Future Work

§  Application to various scenarios §  Testing vocabulary §  Adding more details §  Code generation for different languages §  Textual and visual language §  Modeling representations §  Connecting legacy systems

University of Hagen - Faculty of Mathematics and Computer Science

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Thank you for your attention!

University of Hagen - Faculty of Mathematics and Computer Science

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References §  M. Nottingham. Web Linking. Request for Comments: 5988.

Internet Engineering Task Force (IETF), October 2010. §  M. Nottingham and R. Sayre. The atom syndication format.

Request for Comments: 4287. Internet Engineering Task Force (IETF), December 2005.

§  L. Richardson and S. Ruby. RESTful Web Services. O'Reilly Media, 2007.

§  T. Stahl, M. Völter, S. Etinge, and A. Haase. Modellgetriebene Softwareentwicklung: Techniken, Engineering, Management. dpunkt.verlag, 2007.

§  D. Steinberg, F. Budinsky, M. Paternostro, and E. Merks. EMF: Eclipse Modeling Framework. Addison-Wesley Longman, 2009.

§  S. Tilkov. REST und HTTP: Einsatz der Architektur des Webs für Integrationsszenarien. dpunkt.verlag, 2009.