Model-Driven Software Development - Web Abstractions 1
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The document discusses the WebDSL domain-specific language for developing web applications. It introduces key concepts of the WebDSL language like defining entity models, templates for displaying data, navigation between pages, and access control rules. The document provides examples of how these concepts are used in WebDSL to build features of a sample wiki application. It also outlines some directions for future work, like additional web abstractions, language implementation details, and language modeling techniques.
Model-Driven Software Development - Web Abstractions 1
- 1. Web Abstractions 1 data models, user interface templates, access control Lecture 3 Course IN4308 Eelco Visser Master Computer Science http://eelcovisser.org Delft University of Technology Wednesday, March 10, 2010
- 2. Application Model = Domain Model + Interaction Design System Domain Model = State? Interaction Design = Behaviour? Wednesday, March 10, 2010
- 3. From high-level declarative model Model automatically generate efficient & complete implementation System Wednesday, March 10, 2010
- 4. How to model applications? Wednesday, March 10, 2010
- 5. Wat makes a blog? Wednesday, March 10, 2010
- 6. Wat makes a webshop? Wednesday, March 10, 2010
- 7. Wat makes a chair? Wednesday, March 10, 2010
- 8. Wat makes a chair? Wednesday, March 10, 2010
- 9. Purpose => Features ? Wednesday, March 10, 2010
- 10. Application Model = Collection of UML Diagrams generate implementation from model Wednesday, March 10, 2010
- 11. Details make the difference - Consider ★ interaction styles ★ layout ★ color schemes ★ fonts ★ personalization ★ ... - Parameters of the modeling language? ★ generic, orthogonal definition? Wednesday, March 10, 2010
- 12. UI programming is like assembly programming concerned with screen components not with interaction styles & concepts want: declaration of user interaction Wednesday, March 10, 2010
- 13. Problem: ‘UI tweaking’ - code generation produces standardized/limited UI Alternative: extra ‘hand coding’ e.g. UI templates not part of model Conclusion: - modeling not adequate for interaction design - user interface programming is low-level Wednesday, March 10, 2010
- 14. instead of a general purpose solution (UML) address specific class of software systems Wednesday, March 10, 2010
- 15. Intermediate Goal for MDSD develop better programming abstractions for horizontal domains before tackling vertical domains ‘let’s first make it easier to build web apps’ Wednesday, March 10, 2010
- 16. vertical (‘business’) domains UI DM DB accounting horizontal (technical) domains Wednesday, March 10, 2010
- 17. Properties of Domain-Specific Languages DSL design requires tradeoff between - Expressivity - Coverage - Portability - Interoperability - Completeness - Maintainability Extensive discussion in Quarter 4 Wednesday, March 10, 2010
- 18. The Web Domain Wednesday, March 10, 2010
- 19. browser server database app.war a web application lives on the server Wednesday, March 10, 2010
- 20. Concerns in Web Programming - Persistent data ★ data integrity ★ search - User interface ★ data validation ★ styling, layout ★ navigation ★ actions - Workflow d mo re ... - Access control an Wednesday, March 10, 2010
- 21. Problems in Web Programming - Separate language for separate concerns ★ (that’s good) - Lack of integration ★ no consistency checking ★ different language styles - Low-level configuration ★ boilerplate code Wednesday, March 10, 2010
- 22. WebDSL a domain-specific language for web applications separation of concerns & linguistic integration Wednesday, March 10, 2010
- 23. <screenshot webdsl.org> Wednesday, March 10, 2010
- 24. <screenshot researchr> Wednesday, March 10, 2010
- 25. <screenshot tweetview> Wednesday, March 10, 2010
- 26. <screenshot yellowgrass> Wednesday, March 10, 2010
- 27. <screenshot department> Wednesday, March 10, 2010
- 28. Web Abstractions from a declarative point of view (we’ll investigate underlying mechanisms later) Eelco Visser. WebDSL: A Case Study in Domain-Specific Language Engineering. GTTSE 2008: 291-373 Wednesday, March 10, 2010
- 29. Data Model Definition entity declaration property Wednesday, March 10, 2010
- 30. Data Model for Wiki object identifier domain-specific type Wednesday, March 10, 2010
- 31. Page Definition & Navigation page navigation (page call) page definiti on Wednesday, March 10, 2010
- 32. Displaying Data rendering values markup Wednesday, March 10, 2010
- 33. Templates (Page Fragments) template definition template call parameter Wednesday, March 10, 2010
- 34. wiki.css Wednesday, March 10, 2010
- 35. Modifying Data data binding submit page flow Wednesday, March 10, 2010
- 36. Core Wiki navigate action Wednesday, March 10, 2010
- 37. Core Wiki navigate action Wednesday, March 10, 2010
- 38. Creating Objects find/create object by id Wednesday, March 10, 2010
- 39. Modifying Data pass string Wednesday, March 10, 2010
- 40. Core Wiki navigate creates page action Wednesday, March 10, 2010
- 41. Page Index Wednesday, March 10, 2010
- 42. Output Object = Navigation Wednesday, March 10, 2010
- 43. Output Object = Navigation custom definition default definition Wednesday, March 10, 2010
- 44. Access Control Danny M. Groenewegen, Eelco Visser. Declarative Access Control for WebDSL: Combining Language Integration and Separation of Concerns. ICWE 2008: 175-188 Wednesday, March 10, 2010
- 45. Principal representation of principal turn on access control Wednesday, March 10, 2010
- 46. Principal representation of principal turn on access control Wednesday, March 10, 2010
- 47. Authentication Wednesday, March 10, 2010
- 48. Authentication Wednesday, March 10, 2010
- 49. Authentication Wednesday, March 10, 2010
- 50. Registration Wednesday, March 10, 2010
- 51. Access Control Rules ‘may access page f with argument x if boolean expression e is true’ Wednesday, March 10, 2010
- 52. Wiki Access Control Rules ‘anyone can view existing pages, only logged in users can create pages’ ‘only logged in users may edit pages’ Wednesday, March 10, 2010
- 53. Wiki Access Control Rules Wednesday, March 10, 2010
- 54. Wiki Access Control Rules Wednesday, March 10, 2010
- 55. Wiki Access Control Rules Wednesday, March 10, 2010
- 56. Wiki Access Control Rules Wednesday, March 10, 2010
- 57. More Web Abstractions - Access control policies ★ constraints over objects ★ role-based AC, discretionary AC - Data validation ★ form validation ★ data integrity - Loading/accessing templates (partial pages) ★ (AJAX) - Search - Workflow Wednesday, March 10, 2010
- 58. The Future of Quarter 3 - Lecture 4 ★ More web abstractions - Lecture 5 ★ What does WebDSL abstract from? ★ Or: from DSL to Code - Lecture 6 ★ Language workbenches ★ Grammars - Lecture 7 ★ Language modeling Wednesday, March 10, 2010
- 59. Schedule Lab this week ★ Finish & submit proposal Design 1 ★ Entity declarations ★ Basic setup for user interface Cases ★ Case 1: domain analysis in digital library domain ★ Case 2: web abstractions Next ★ Week 4 is ‘spring’ break; Week 5: lecture no, lab yes ★ Week 6: access control policies, validation, search, ... Wednesday, March 10, 2010