Code Refactoring - Live Coding Demo (JavaDay 2014)
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Peter Kofler gives a live coding demonstration of refactoring code to add a new requirement to an inventory management system. He first refactors the existing code to make it more readable and maintainable by removing duplication, splitting methods, and simplifying conditions. He then implements the new requirement that conjured items degrade in quality twice as fast by extracting a strategy pattern. The demonstration shows how refactoring first makes it possible to easily add new features to the code while preserving its behavior.
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- 1. Code Refactoring Live Coding Demo Peter Kofler, ‘Code Cop’ @codecopkofler www.code-cop.org Copyright Peter Kofler, licensed under CC-BY.
- 2. Peter Kofler • Ph.D. (Appl. Math.) • Professional Software Developer for 15 years • Specialised in Re-Engineering of Legacy Code • “fanatic about code quality”
- 4. Yes, some but... • only what is already there • Trial & Error not popular in production • no practice - only production • time pressure
- 5. I help development teams with • Professionalism • Quality and Productivity • Continuous Improvement
- 6. Mentoring • Pair Programming • Programming Workshops • Deliberate Practice, e.g. Coding Dojos
- 8. Refactoring is a technique for restructuring an existing body of code, altering its internal structure without changing its external behaviour. (Martin Fowler)
- 9. Welcome to the Gilded Rose
- 10. The existing inventory system • We have items to sell. Items degrade in quality the older they get. • All items have a SellIn value which denotes the number of days we have to sell the item. • All items have a Quality value which denotes how valuable the item is.
- 11. Requirements • At the end of each day our system lowers both values for every item. • Once the sell by date has passed, Quality degrades twice as fast. • The Quality of an item is never negative. • The Quality of an item is never more than 50.
- 12. Special Item: Brie • Aged Brie actually increases in Quality the older it gets.
- 13. Backstage Passes • Backstage passes, increases in Quality as it's SellIn value approaches (by a complex formula) • but Quality drops to 0 after the concert.
- 14. Special Item • Sulfuras, a legendary item, never has to be sold or decreases in Quality.
- 15. New Requirement • We have recently signed a supplier of conjured items. This requires an update to our system: –Conjured items degrade in Quality twice as fast as normal items.
- 16. What Will We Do Now? ● I will implement the new requirement. ● We will change the code together. ● I will (need) to refactor the existing code.
- 17. Demo Step by step: https://bitbucket.org/pkofler/gilded-rose-refactoring/branch/refactor-7
- 21. Now the New Requirement! • We have recently signed a supplier of conjured items. This requires an update to our system: –Conjured items degrade in Quality twice as fast as normal items.
- 22. What I did • could not implement the requirement easily, had to refactor first. • made it more readable. • removed duplication (extracted duplicates). • split method into logically coherent blocks.
- 23. What I did • simplified complex boolean conditions. • replaced duplicated if-statements with polymorphy (extracted Strategy pattern). • moved common code into the strategy. • finally implemented the new requirement ;-)
- 24. Read these books now! Explore the Refactorings! Practice them in your IDE!
- 25. Peter Kofler @codecopkofler www.code-cop.org Gilded Rose Kata by Emily Bache @emilybache http://coding-is-like-cooking.info/2013/03/writing-good-tests-for-the-gilded-rose-kata/
- 26. CC Images ● Hamster http://www.flickr.com/photos/zebrapares/4529836138 ● master http://www.flickr.com/photos/sherpas428/4350620602/ ● pairing http://www.flickr.com/photos/dav/94735395/ ● inn http://www.flickr.com/photos/danielleblue/170496395/ ● Brie http://www.flickr.com/photos/chez_loulou/2767503201 ● pass http://www.flickr.com/photos/frf_kmeron/5556518514 ● Sulfuras https://www.flickr.com/photos/sharelabs/11195626116