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Mikado Method - Beheading the Legacy Beast - Agile India 2012
- 1. Beheading the legacy beast Refactorings & restructurings with The Mikado Method Daniel Brolund @danielbrolund #mikadomethod @mikadomethod
- 3. Code ch ange horr or st ories !!
- 4. Once upon a time, we were to change a codebase...
- 6. Lets say this was our system...
- 7. A change We were to make a change...
- 8. ✘ ✘ ✘✘ A change ✘✘✘ ✘ ...but we got some errors...
- 9. ✘ ✘ ✘✘ A change ✘✘✘ ✘ Patching led to more errors...
- 10. ✘ ✘ ✘✘ ✘ ✘ ✘ ✘ ✘ ✘✘ A change ✘✘✘ ✘ Patching led to more errors...
- 11. ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘✘ ✘ ✘ ✘ ✘ ✘ ✘✘ A change ✘✘✘ ✘ Patching led to more errors...
- 12. ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘✘ ✘ ✘ ✘ ✘ ✘ ✘✘ A change ✘✘✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘✘ ✘ Patching led to more errors...
- 13. ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘✘ ✘ ✘ ✘ ✘ ✘ ✘✘ A change ✘✘✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘✘ ✘ ...and each patch led to even more errors...
- 14. ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘✘ ✘ ✘ ✘ ✘ ✘ A change ✘✘✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ...and each patch led to even more errors...
- 15. ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘✘ ✘ ✘ ✘ ✘ ✘ A change ✘✘✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ Like trying to stop the shockwave with our hands...
- 16. ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘✘ ✘ ✘ ✘ ✘ ✘ A change ✘✘✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘✘ ✘ ✘ ✘ ✘ ✘ ✘ ✘ We could only revert.
- 17. We could only revert.
- 19. But we really needed to do that change!
- 21. ✘✘ ✘ ✘ A change ✘✘✘ ✘ ...the same errors...
- 22. This time, we noted a prerequisite for each of the errors... ✘✘ ✘ ✘ A change ✘✘✘ ✘
- 23. This time, we noted a prerequisite for each of the errors... Prereq ✘ ✘✘ ✘ A change ✘✘✘ ✘
- 24. This time, we noted a prerequisite for each of the errors... Prereq ✘ Prereq ✘✘ ✘ A change ✘✘✘ ✘
- 25. This time, we noted a prerequisite for each of the errors... Prereq ✘ Prereq ✘✘ ✘ A change ✘✘✘ Prereq ✘
- 26. ...then we reverted the errors, but we kept the notes! Prereq Prereq A change Prereq
- 27. Then we Prereq Prereq implemented the A change prerequisites, one at a time... Prereq
- 28. Then we Prereq Prereq implemented the A change prerequisites, one at a time... Prereq
- 29. ...got new errors... ✘ ✘ ✘✘ ✘✘ ✘ ✘ Prereq Prereq A change Prereq
- 30. ...noted the new prerequisites... ✘ ✘ ✘✘ ✘✘ ✘ ✘ Prereq Prereq A change Prereq
- 31. ...noted the new prerequisites... ✘ ✘ ✘✘ Prereq✘✘ ✘ ✘ Prereq Prereq A change Prereq
- 32. ...noted the new prerequisites... Prereq✘✘ ✘ ✘ Prereq✘✘ ✘ ✘ Prereq Prereq A change Prereq
- 33. ...and reverted again Prereq✘✘ ✘ ✘ Prereq✘✘ ✘ ✘ Prereq Prereq A change Prereq
- 34. ...and reverted again Prereq Prereq Prereq Prereq A change Prereq
- 35. Picked the next leaf a.s.o... Prereq Prereq Prereq Prereq A change Prereq
- 36. ...until we could do a prerequisite w/o errors Prereq Prereq ✔ Prereq Prereq A change Prereq
- 37. We continued with all leaves... Prereq ✔ Prereq ✔ Prereq Prereq A change Prereq
- 38. Prereq ✔ Prereq ✔ Prereq ✔ Prereq ...getting transient A change prerequisites in place... Prereq
- 39. Prereq ✔ Prereq ✔ Prereq ✔ ✔ ...fulfilling Prereq prerequisites... A change Prereq
- 40. Prereq ✔ Prereq ✔ Prereq ✔ ✔ Prereq A change ...working the way Prereq ✔ back to the original change
- 41. Prereq ✔ Prereq ✔ Prereq ✔ ✔ Prereq A change Prereq ✔ In time, all prerequisites for the original change were in place...
- 42. Prereq ✔ Prereq ✔ Prereq ✔ ✔ Prereq A change ✔ Prereq ✔ The change was now easy to implement.
- 43. Prereq ✔ Prereq ✔ Prereq ✔ ✔ Prereq A change ✔ Prereq ✔ We’re done!
- 44. Mikado Method “rules”
- 45. Mikado Method “rules” Write down yo ur goal
- 46. Mikado Method “rules” Write down yo ur goal Seek things to try
- 47. Mikado Method “rules” Write down yo ur goal Seek things to try Back out broken cod e
- 48. Mikado Method “rules” Write down yo ur goal Seek things to try Back out broken cod e es re cursively rere quisit Fix the p
- 49. Benefits
- 50. Benefits Always deliverable - from the main branch
- 51. Benefits Always deliverable - from the main branch Goal focus - do only the necessary
- 52. Benefits Always deliverable - from the main branch Goal focus - do only the necessary Visualization - memo and cooperation
- 56. ?!? Now, where’s the code...?!?
- 57. Let's do an example!
- 58. Welcome to Pasta Inc.
- 59. Exercise: D.I.Y. Instructions: http://mikadomethod.wordpress.com/exercises/ Code: https://github.com/mikadomethod/kata-java Git: git clone git://github.com/mikadomethod/kata-java.git git clone git://github.com/mikadomethod/kata-dotnet.git
- 60. The book Beheading the Legacy Beast Relentless restructurings with Daniel Brolund @danielbrolund The Mikado Method Ola Ellnestam @ellnestam #mikadomethod @mikadomethod http://mikadomethod.org http://mikadomethod.wordpress.com/book http://groups.google.com/group/mikado-method Daniel Brolund Ola Ellnestam Foreword by Tom Poppendieck
- 61. Questions? ??? ...or catch me later!