Apresentação realizada no Agile Brazil em Fortaleza, 29/06/2011.

1. Uma abordagem efetiva para melhoria contínua da qualidade de
software
Roberto Pepato Mellado
@rpepato
Gabriel Moreira
@gspmoreira

3. George L. Kelling
James Q. Wilson

8. [ISO 9126 / 25000]
Maintainability
Analisability
Modificability
Stability
Testability

9. Maintenance Effort and
Software Maintainability
Accuracy
Preventive

10. why?

11. [Kemerer et. Al, 1999]

12. [Jones, 2007]

13. [Bennet, 2002]

14. Not me!

15. Programmers are constantly in
maintenance mode
“You are rarely writing original
code.”
"I'm maintaining from day one."
“It's only the first 10 minutes that
the code's original, when you type it
in the first time. That's it.”

16. Don’t Make This Common Mistake

17. Technical Debt

19. Quality or Fast Delivery?

26. It’s not my fault, but it is still my problem

28. Dreaming and Planning Software Quality
for his next project

30. Dijkstra
[design by
Philip Calçado]
is Watching

31. Formal Inspection

32. Lightweight Inspection

33. Next, please!

34. Static Code Analysis

35. What about tools?
http://en.wikipedia.org/wiki/List_of_tools_for_static_code_analysis

36. FxCop (.NET)

37. StyleCop (.NET)

38. Resharper (.NET)

39. NDepend (.NET)

40. JDepend (Java)

41. Find Bugs (Java)

42. CCFinder (C#, Java, C++, VB)

43. SimpleCov (Ruby)

44. SimpleCov (Ruby)

45. Metric-fu -- Churn (Ruby)

46. Metric-fu -- Flog(Ruby)

47. Metric-fu -- Reek(Ruby)

48. Metric-fu -- Stats(Ruby)

49. Metric-fu -- Hotspots(Ruby)

51. Continuous
Inspection
CI + SCA

54. Continuous
Improvement
Metrics
Bad Smells
Inspection
Refactoring

55. Conditional Complexity
Measure: Cyclomatic complexity
Tools
• JavaNCSS
• PMD
• NDepend
Refactorings
• Replace Conditional with
Polymorphism
• Extract Method

56. Duplicated Code
Measure: Code duplication
Tools: CheckStyle, PMD
Refactorings:
• Extract Method
• Pull Up Method
• Form Template Method
• Substitute Algorithm

57. Long Method / Class
Measure: Source lines of code
(SLOC)
Tool: PMD, JavaNCSS,
CheckStyle
Refactorings: Extract Method,
Replace Temp with Query,
Introduce Parameter Object,
Preserve Whole Object,
Replace Method with Method
Object

58. Excessive Dependency
Measure: Efferent coupling
(fan-out per class)
Tool: CheckStyle, NDepend
Refactorings:
• Move Method
• Extract Class

59. Inspection Automation in CI
<target name="inspect" >
<exec program="${tools.fxcop}"
commandline="/p:${reports.scripts}Mineradores.fxcop
/out:${reports.output}ccnet-fxcop-results.xml"
failonerror="false"/>
<exec program="${tools.stylecopcmd}"
commandline="-sf
&quot;${libandunittest.buildfile.path}LibAndUnitTest.sln&quot; -
of &quot;${reports.output}ccnet-libstylecop-output.xml&quot;"
failonerror="false"/>
<exec program="${tools.ndepend}" failonerror="false">
<arg value="${reports.scripts}Mineradores-NDepend.xml" />
<arg value="/OutDir &quot;${reports.ndepend.output}&quot;" />
</exec>
</target>

60. NDepend Report

61. NDepend Report

62. Combination from measures of attributes belonging to a
software product, or to its development process, which shows
quantitatively some of its characteristics.

63. Software Product Metrics
Métricas de Produto OO
Tamanho Complexida Acoplamento Coesão Herança Other Metrics
•LOC de •AC – Aferent •LCOM – Lack of •NOC - Number of •Churn
•N. Métodos Coupling Cohesion Children •Program
•CC - Methods
•N. Atributos •EC – Eferent •DIT - Depth of Vocabulary
Complexidade Coupling •LCOM-HS - Lack Inheritance Tree •...
Ciclomática •ABC – of Cohesion Of
•Métricas de Association Methods
Halstead Between Classes Henderson-
•MCD - Max Sellers
Conditional
Depth
•MLD - Max
Loop Depth
•DD - Decision
Density

64. How to Deal With Lots Of Data?

65. Metrics Analysis – Dashboards (Sonar)

66. Metrics Analysis – Temporal Series

67. Metrics Analysis - Control Charts

68. Metrics Analysis - OLAP

69. Metrics Analysis – Indicators from DW

70. Build Definition

71. Going Deeper

74. I need some help!

76. Roberto Pepato Mellado Gabriel Moreira
rpepato@gmail.com gabrielspmoreira@yahoo.com.br
@rpepato @gspmoreira
http://workingsweng.wordpress.com/

77. http://www.agilevale.com.br/
@agilevale
#agilevale
19 e 20 de Agosto de 2011