Secret Assumption of Agile
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The document discusses agile methodologies, focusing on the productivity and iterative design aspects that allow for easier code changes. It emphasizes the importance of simple design, refactoring, and collaborative learning through an object-oriented (OO) boot camp. The training aims to improve programming skills across various languages, highlighting the significance of design patterns and code maintainability.
Secret Assumption of Agile
- 1. The Secret Assumption of Agile Fred George fredgeorge@acm.org @fgeorge52 Copyright © 2009-2013 by Fred George 1
- 2. Agile is Productive Traditional Agile 3 Months 12 Months 8 Months............. 5 Months 8 Months $28 / Hour $87 / Hour $2,000,000 6x $1,100,000 Copyright © 2009-2013 by Fred George 2
- 3. How? 1. Code That Can Change 2. Lean Management 3. Processing Power Copyright © 2009-2013 by Fred George 3
- 4. “Objects are only good for programs that change.” Rick DeNatale, IBM 1988 Copyright © 2009-2013 by Fred George 4
- 5. Stories Assume Easy Change Copyright © 2009-2013 by Fred George 5
- 6. Typical Program public void foo( ) { ... How many lines? ... ... ... ... 2.3 lines / method ... 25 lines / class ... ... Smalltalk: } 1.1 lines / method Copyright © 2009-2013 by Fred George 6
- 7. Replacement Application Old New Java Java Oracle DB Oracle DB Web UI Web UI 72 Classes 1400 Classes Copyright © 2009-2013 by Fred George 7
- 8. Tasking Cycle Task Integrate Design Ship Code Test Copyright © 2009-2013 by Fred George 8
- 9. Task Cycle Case Study Task Integrate Design 1,000,000 Lines of J2EE Code 2-4 Hours 50 Programmers 4000 Tests Cycle Time? Code Test Copyright © 2009-2013 by Fred George 9
- 10. Tasking Cycle Task 15 Minutes Integrate Design 15 Minutes Code Test Copyright © 2009-2013 by Fred George 10
- 11. Simple Design 1. Works 2. Communicates 3. No duplicate code 4. Least classes and methods Applies to Application and Tests Copyright © 2009-2013 by Fred George 12
- 12. Refactoring Martin Fowler Copyright © 2009-2013 by Fred George 13
- 13. Tasking Cycle Task Integrate Design Simple Design Refactoring Code Test Copyright © 2009-2013 by Fred George 14
- 14. Refactoring to Patterns Joshua Kerievsky Copyright © 2009-2013 by Fred George 15
- 15. Tasking Cycle Task Integrate Design Introduce Patterns Refactoring Refactoring Code Test Copyright © 2009-2013 by Fred George 16
- 16. Case Study: Complexity Cyclomatic Complexity 100 is Bad “...never seen less than 5” - Senior Architect Cyclomatic Complexity: 1.8 9 week test: 1 bug, fixed within 2 hours Copyright © 2009-2013 by Fred George 17
- 17. Path to Proficiency en ce xp eri E ng i ni Tra ng ki or W Copyright © 2009-2013 by Fred George 18
- 18. Product Requests (London) Payback: 28 Stories 11 Days 12 Days Class 23 Stories 5 Days 15 Days Copyright © 2009-2013 by Fred George 19
- 19. OO Boot Camp “...teaches you to think like a programmer...” Copyright © 2009-2013 by Fred George 20
- 20. “15 minutes after the class started, I realized I knew nothing about programming.” Lead Designer, Consulting Firm, commenting to CIO of a large US manufacturer. Copyright © 2009-2013 by Fred George 21
- 21. OO Boot Camp History: Since 1995 Over 1000 Students; 3 countries Java, VB, C#, Ruby Socratic Method (Question - Answer - Question) 60%+ Lab Pair Programming Test First (15 Minute Cycle) Students Present Solutions Copyright © 2009-2013 by Fred George 22
- 22. Master Journeyman Apprentice Copyright © 2009-2013 by Fred George 23
- 23. Master 2Y ear s- Ne ver Journeyman on ths 2- 6M Apprentice Copyright © 2009-2013 by Fred George 24
- 24. Part 1: Principles Encapsulation Collaborating Objects Object Relationships Interfaces Inheritance Coding Patterns Delegation Refactoring Polymorphism Recursion 40-50 Hours Copyright © 2009-2013 by Fred George 25
- 25. Part 2: Design Patterns Rationale Composite Pattern Patterns vs. Principles Visitor Pattern Observer Pattern Builder Pattern Iterator Pattern Concerts Mediator Pattern Survey of Patterns 40-50 Hours Copyright © 2009-2013 by Fred George 26
- 26. Suspicious Statements case - Almost always wrong else - Mostly wrong if - Suspicious Unless guard clause at start of method Substitute Design Patterns for all these Copyright © 2009-2013 by Fred George 27
- 27. Suspicious Methods getters - Violates Encapsulation setters - Worse: violates Encapsulation and Object integrity Methods with 2 or more levels of indenting Copyright © 2009-2013 by Fred George 28
- 28. Suspicious Classes Classes with names ending in -er or -or Special naming conventions for Interfaces Interface with a single implementing Class Classes with more than 2 instance variables Copyright © 2009-2013 by Fred George 29
- 29. Results Dropouts 20% Journeymen 20% Architecture, Design, Multiple Predictors Languages Retention Must be used within a month Support Journeymen, Masters Copyright © 2009-2013 by Fred George 30
- 30. Maintenance Old New Java Java Oracle DB Oracle DB Web UI Web UI 72 Classes 1400 Classes Copyright © 2009-2013 by Fred George 31
- 31. Transition Plan No Documentation No Training No Time No Problem! Copyright © 2009-2013 by Fred George 32
- 32. Training -- OO Boot Camp First class 1 October 9-12 students / class Include project managers and QA 4 classes so far Copyright © 2009-2013 by Fred George 33
- 33. Implementation Start development on 15 October Ruby used (never used before 1 October) No stories - just business problem First page ready for review by end of November Copyright © 2009-2013 by Fred George 34
- 34. Currently... 5 Tables running Each Table has it’s own business problem Only developers Speaker designated Processes are varying, particularly metrics Copyright © 2009-2013 by Fred George 35
- 35. Questions? Copyright © 2009-2013 by Fred George 36