Measure and Improve code quality. Using automation.
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Slides from my talk given at MCJUG on 9/17/2014 on measuring and improving code quality using tools such as Sonar.
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Measure and Improve code quality. Using automation.
- 1. Measure and improve code quality Using automation
- 2. About myself MCJUG 2 / 42
- 3. Vlad Korolev Been doing software development for 20+ years Have seen (and wrote) code of varying quality Personally experienced many problems discussed in this talk MCJUG 3 / 42
- 4. What is Code Quality? MCJUG 4 / 42
- 5. What is Quality? MCJUG 5 / 42
- 6. David Garvin Five Dimensions of Quality 1 Transcendental 2 Product 3 User 4 Manufacturing 5 Value MCJUG 6 / 42
- 7. Transcendental Plato A characteristic of an object that could not be described. But could be learned when one is exposed to a succession of high quality objects. MCJUG 7 / 42
- 8. Transcendental Aristotle Quality is not an act, but a habit. MCJUG 7 / 42
- 9. Transcendental Robert Pirsig I think there is such a thing as Quality, but that as soon as you try to de
- 10. ne it, something goes haywire. You can't do it. MCJUG 7 / 42
- 11. Transcendental Pirsig No way to explain, but everybody knows it through repeated exposure to low / high quality product MCJUG 7 / 42
- 12. Product: Precise measurement of known variable Ice Cream More butterfat ! higher quiality MCJUG 8 / 42
- 13. Product: Precise measurement of known variable Persian rugs More knots per square inch ! higher quiality MCJUG 8 / 42
- 14. User More desirable products are of higher quality. MCJUG 9 / 42
- 15. User Better selling products are of higher quality. MCJUG 9 / 42
- 16. Manufacturing Conformance to well de
- 17. ned standard. MCJUG 10 / 42
- 18. Manufacturing Lower variance ! higher quality. MCJUG 10 / 42
- 19. Value : Monetary More expensive products are of higher quality. MCJUG 11 / 42
- 20. Value : Monetary Ferrari is of higher quality than Pinto. MCJUG 11 / 42
- 21. What is Code Quality? MCJUG 12 / 42
- 22. Code Quality External Internal MCJUG 13 / 42
- 23. External Code Quality MCJUG 14 / 42
- 24. External Code Quality MCJUG 14 / 42
- 25. External Code Quality MCJUG 14 / 42
- 26. External Code Quality MCJUG 14 / 42
- 27. External Code Quality MCJUG 14 / 42
- 28. External Code Quality MCJUG 14 / 42
- 29. External Code Quality MCJUG 14 / 42
- 30. External Code Quality Ad hoc tests MCJUG 15 / 42
- 31. External Code Quality Ad hoc tests QA Tests MCJUG 15 / 42
- 32. External Code Quality Ad hoc tests QA Tests Regression tests MCJUG 15 / 42
- 33. External Code Quality Ad hoc tests QA Tests Regression tests User reports MCJUG 15 / 42
- 34. External Code Quality Ad hoc tests QA Tests Regression tests User reports Your boss comes up to you saying : MCJUG 15 / 42
- 35. External Code Quality Ad hoc tests QA Tests Regression tests User reports Your boss comes up to you saying : 1 All systems are down MCJUG 15 / 42
- 36. External Code Quality Ad hoc tests QA Tests Regression tests User reports Your boss comes up to you saying : 1 All systems are down 2 The system is crediting wrong accounts MCJUG 15 / 42
- 37. External Code Quality Ad hoc tests QA Tests Regression tests User reports Your boss comes up to you saying : 1 All systems are down 2 The system is crediting wrong accounts 3 The system is delivering messages to the wrong users MCJUG 15 / 42
- 38. Internal Code Quality When you're a carpenter making a beautiful chest of drawers, you're not going to use a piece of plywood on the back, even though it faces the wall and nobody will ever see it. Youll know its there, so youre going to use a beautiful piece of wood on the back. For you to sleep well at night, the aesthetic, the quality, has to be carried all the way through. Steve Jobs MCJUG 16 / 42
- 39. Internal Code Quality How do we measure it? MCJUG 17 / 42
- 40. Internal Code Quality How do we measure it? What's our equivalent of plywood? MCJUG 17 / 42
- 41. 7 Axes of Code Quality Bad Patterns [ Bugs ] MCJUG 18 / 42
- 42. 7 Axes of Code Quality Bad Patterns [ Bugs ] Bad Style [ Coding Rules ] MCJUG 18 / 42
- 43. 7 Axes of Code Quality Bad Patterns [ Bugs ] Bad Style [ Coding Rules ] Tests / Tests coverage MCJUG 18 / 42
- 44. 7 Axes of Code Quality Bad Patterns [ Bugs ] Bad Style [ Coding Rules ] Tests / Tests coverage Duplicated Code [ Cut and paste ] MCJUG 18 / 42
- 45. 7 Axes of Code Quality Bad Patterns [ Bugs ] Bad Style [ Coding Rules ] Tests / Tests coverage Duplicated Code [ Cut and paste ] Comments MCJUG 18 / 42
- 46. 7 Axes of Code Quality Bad Patterns [ Bugs ] Bad Style [ Coding Rules ] Tests / Tests coverage Duplicated Code [ Cut and paste ] Comments Architecture Lack of Cohesion of Methods Cicular dependencies MCJUG 18 / 42
- 47. 7 Axes of Code Quality Bad Patterns [ Bugs ] Bad Style [ Coding Rules ] Tests / Tests coverage Duplicated Code [ Cut and paste ] Comments Architecture Lack of Cohesion of Methods Cicular dependencies Complexity God classes God methods MCJUG 18 / 42
- 48. Lack of Cohesion of Methods [LCOM4] MCJUG 19 / 42
- 49. Lack of Cohesion of Methods [LCOM4] MCJUG 19 / 42
- 50. Code Complexity MCJUG 20 / 42
- 51. Response for Class MCJUG 21 / 42
- 52. Cyclomatic Complexity Keywords that increment complexity: if, for, while, case, catch, throw, return (that is not the last statement of a method), conditionals, else Keywords that don't increment complexity: default, finally MCJUG 22 / 42
- 53. Sonar MCJUG 23 / 42
- 54. What is Sonar? Web based tool. MCJUG 24 / 42
- 55. What is Sonar? Web based tool. Collects collects metrics from multiple projects MCJUG 24 / 42
- 56. What is Sonar? Web based tool. Collects collects metrics from multiple projects Repository of rules MCJUG 24 / 42
- 57. What is Sonar? Web based tool. Collects collects metrics from multiple projects Repository of rules Ticketing system for quality improvement MCJUG 24 / 42
- 58. What is Sonar? Web based tool. Collects collects metrics from multiple projects Repository of rules Ticketing system for quality improvement Dashboards / Reports MCJUG 24 / 42
- 59. Why should I use sonar ? Tester: Pinpoint the weak spots Overly complex code No coverage MCJUG 25 / 42
- 60. Why should I use sonar ? Developer: Education Thread Safety Resource management Language subtleties MCJUG 26 / 42
- 61. Why should I use sonar ? Developer: Maintainability Readability Complexity Missing or incorrect documentation MCJUG 27 / 42
- 62. Why should I use sonar ? Developer: Adherence to standards Naming convention Formatting Use of bad methods System.out.println Coding rule compliance Boilerplate code MCJUG 28 / 42
- 63. Why should I use sonar ? Architect: Is design being degraded? Circular dependencies Lack of cohesion Over complex classes and methods MCJUG 29 / 42
- 64. Why should I use sonar ? Big Boss MCJUG 30 / 42
- 65. Why should I use sonar ? Big Boss : Metrics MCJUG 30 / 42
- 66. Platforms Java MCJUG 31 / 42
- 67. Platforms Java .NET MCJUG 31 / 42
- 68. Platforms Java .NET C++ MCJUG 31 / 42
- 69. Platforms Java .NET C++ Python MCJUG 31 / 42
- 70. Demo MCJUG 32 / 42
- 71. Main Dashboard MCJUG 33 / 42
- 72. Project Drill-Down MCJUG 34 / 42
- 73. Project Issues Drill-Down MCJUG 35 / 42
- 74. Project Issues Drill-Down MCJUG 35 / 42
- 75. Issue Tracking MCJUG 36 / 42
- 76. Issue Tracking MCJUG 36 / 42
- 77. Issue Tracking MCJUG 36 / 42
- 78. Cut and Paste MCJUG 37 / 42
- 79. Lack of Cohesion MCJUG 38 / 42
- 80. Lack of Cohesion MCJUG 38 / 42
- 81. Project Health MCJUG 39 / 42
- 82. Project Health MCJUG 39 / 42
- 83. Project Health MCJUG 39 / 42
- 84. Project Health MCJUG 39 / 42
- 85. Quality Pro
- 86. les MCJUG 40 / 42
- 87. Quality Pro
- 88. les MCJUG 40 / 42
- 89. Questions ??? MCJUG 41 / 42
- 90. End MCJUG 42 / 42