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Navigation Framework using CF

Navigation Framework using CF. Architecture for a Client-Server Application using the open standards of the web. presented by. Kedar Desai. Navigation…a new paradigm. Queue based function control Non URL based navigation. What is Navigation?. User’s perspective:

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Navigation Framework using CF

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  1. Navigation Framework using CF Architecture for a Client-Server Application using the open standards of the web presented by Kedar Desai

  2. Navigation…a new paradigm • Queue based function control • Non URL based navigation

  3. What is Navigation? • User’s perspective: • Ability to use the system in the most efficient manner • Designer’s perspective: • Ability to manage or direct the course of the user using the system

  4. What is this“Client Server” Application? • MDI Interface • Thick Client • EXE • Built using PowerBuilder, Visual Basic, etc.

  5. Associated Problems • Maintaining a code base • DLL Hell • Distributing an EXE • Maintaining ‘Help’ files • Difficulties in adding new functionality

  6. About the Application • Justice Information System • Application Architecture ColdFusion Application Server Sybase Database Client Browser: HTML, JS, CSS

  7. Application Challenges • Consists of around 500 Functions • Over 200 database tables • Database Intensive • Transaction Intensive

  8. Application Frameworks • Two Main frameworks: • Navigation Framework • Navigation • Error Handler • Business Rule Engine • Security Framework • Each framework is independent

  9. What is so great about this Navigation framework? • Look and feel of a standard windows application • Excellent navigation • Uses ColdFusion

  10. Navigation Framework: Features • Driven by keys. • Works on a queue architecture. • Maintains State in Session variables.

  11. Message Module • Provides ability to maintain messages in the database • Functions include: • Message Search and List, Message Modify, Message Delete, Message New, Message Text Modify, Message Details

  12. Demo

  13. Function Architecture • Five ‘.cfm’ files per function • Five hidden fields per function

  14. The Five ‘.cfm’ files • Form Page • Main cfm file • OnError cfm file • CFForm cfm file • Presentation cfm file • Action Page • Action cfm file

  15. The Hidden Fields • Each function has five hidden fields • Function id • Page id • Main cfm file name • OnError cfm file name • Action cfm file name • Target Function id

  16. Navigation Controllers • Form Controller • Opens the function • Action Controller • Triggers the action of the function • OnError Controller • Controls display of errors • Key Controller • Controls ‘key’ and ‘queue’ maintenance

  17. What are keys? • Every function has a set of input and/or output keys • A key is a value that fetches data to be displayed on the function • Keys are kept in a queue • If no keys exists, the default function is opened

  18. What is a queue? • Maintains information about the activities that the user wants to perform in a sequence. • Function queue and keys queue are the major queues.

  19. How is state maintained? • Using Session variables • Each session has a ‘userid’ associated with it, thus enabling multiple sessions on the client browser.

  20. How does a function open? • Form Controller controls the opening of the form. • The file opening sequence is: • Main cfm • OnError cfm • CFForm cfm • Presentation cfm

  21. Navigation Flow Function List Action Controller Errors? Error Controller Yes No Function Displayed On Browser Form Controller

  22. Error Controller • Builds the error page • Appends the error page to the form page

  23. Features • Secure Access. • Centralized action and form pages. • Centralized error handling. • Everything is a custom tag. • Logic and presentation isolated. • F5 or Refresh works as in a browser.

  24. Points to ponder • Browser back and forward buttons unusable. • Even though everything is a custom tag, ‘Custom Tag’ directory is not helpful • Not much use for Application.cfm

  25. Productivity Metrics • Built in under 3 months • A function being developed every two days • A TEAM of five

  26. ThankYou

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