重構—改善既有程式的設計（chapter 12,13）

Jun 2, 2011Download as PPTX, PDF1 like591 views

Chris Huang

May. 2011 Jerry HsuRefactoring (ch 12, 13)

2ClassificationChapter 12. Big Refactorings本質沒有準確的重構步驟時間

3ClassificationChapter 12. Big Refactorings梳理並分解繼承體系將程序式設計轉化為物件設計將領域和表述/顯示分離提煉繼承體系

4Classification12.1 Tease Apart Inheritance梳理並分解繼承體系混亂的繼承體系重複的程式碼某個繼承體系承擔了兩項不同的責任交易種類顯示風格

5ClassificationTease Apart Inheritance1. Extract class

6Classification12.1 Tease Apart Inheritance2. Create sub class3. Move method

7Classification12.1 Tease Apart Inheritance

8Classification12.1 Tease Apart Inheritance

9Classification12.2 Convert Procedural Design to Objects將程序式設計轉化為物件設計

10Classification12.2 Convert Procedural Design to Objects作法: 看課本Ex: Page 5  Page 51

11Classification12.3 Separate Domain from Presentation 將領域和表述/顯示分離

12Classification12.3 Separate Domain from Presentation MVCModel  DomainView  PresentationControl  Logicone business logic  multiple views

13Classification12.3 Separate Domain from Presentation InvokerTable entityBusiness entityTransformDatabase

14Classification12.4 Extract Hierarchy 提煉繼承體系某個class做了太多工作，其中一部分的工作是以大量條件式完成的

16ClassificationChapter 13. Refactroing, Reuse and Reality為什麼開發者不願意重構他們的程式你不知道如何重構重構的效益要長時間才能展現出來重構是一項額外工作，老闆付錢給你是要你寫新功能重構會破壞現有程式

17ClassificationChapter 13. Refactroing, Reuse and Reality重構的效益要長時間才能展現出來短期利益程式碼總量變少重複的程式碼有錯誤只需要修改一個地方Trace, debug中期利益重構的抽象層對於定義後續檔案系統很有幫助長期利益我們的身體健康

18ClassificationChapter 13. Refactroing, Reuse and Reality降低重構帶來的額外開銷

Reduce the overhead of refactoring工具雖然重構需要額外開銷，但是可以從”在程式開發期間其他階段降低所需心力及滯怠時間”而獲得補償

19ClassificationChapter 13. Refactroing, Reuse and Reality安全的進行重構How相信自己的功力相信compiler相信test suite相信 code review

This document discusses various refactoring techniques for simplifying conditional expressions and logic in code. It provides examples of refactoring techniques like decomposing conditional expressions, consolidating duplicate conditional fragments, removing control flags, replacing nested conditionals with guard clauses, replacing conditionals with polymorphism, introducing null objects, and introducing assertions. The goal of these refactoring techniques is to simplify complex conditional logic and make the code easier to read, understand and maintain.

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重構—改善既有程式的設計（chapter 12,13）

1. May. 2011 Jerry HsuRefactoring (ch 12, 13)

2. 2ClassificationChapter 12. Big Refactorings本質沒有準確的重構步驟時間

3. 3ClassificationChapter 12. Big Refactorings梳理並分解繼承體系將程序式設計轉化為物件設計將領域和表述/顯示分離提煉繼承體系

4. 4Classification12.1 Tease Apart Inheritance梳理並分解繼承體系混亂的繼承體系重複的程式碼某個繼承體系承擔了兩項不同的責任交易種類顯示風格

5. 5ClassificationTease Apart Inheritance1. Extract class

6. 6Classification12.1 Tease Apart Inheritance2. Create sub class3. Move method

7. 7Classification12.1 Tease Apart Inheritance

8. 8Classification12.1 Tease Apart Inheritance

9. 9Classification12.2 Convert Procedural Design to Objects將程序式設計轉化為物件設計

10. 10Classification12.2 Convert Procedural Design to Objects作法: 看課本Ex: Page 5  Page 51

11. 11Classification12.3 Separate Domain from Presentation 將領域和表述/顯示分離

12. 12Classification12.3 Separate Domain from Presentation MVCModel  DomainView  PresentationControl  Logicone business logic  multiple views

13. 13Classification12.3 Separate Domain from Presentation InvokerTable entityBusiness entityTransformDatabase

14. 14Classification12.4 Extract Hierarchy 提煉繼承體系某個class做了太多工作，其中一部分的工作是以大量條件式完成的

15. 15Classification12.4 Extract Hierarchy

16. 16ClassificationChapter 13. Refactroing, Reuse and Reality為什麼開發者不願意重構他們的程式你不知道如何重構重構的效益要長時間才能展現出來重構是一項額外工作，老闆付錢給你是要你寫新功能重構會破壞現有程式

17. 17ClassificationChapter 13. Refactroing, Reuse and Reality重構的效益要長時間才能展現出來短期利益程式碼總量變少重複的程式碼有錯誤只需要修改一個地方Trace, debug中期利益重構的抽象層對於定義後續檔案系統很有幫助長期利益我們的身體健康

18. 18ClassificationChapter 13. Refactroing, Reuse and Reality降低重構帶來的額外開銷

19. Reduce the overhead of refactoring工具雖然重構需要額外開銷，但是可以從”在程式開發期間其他階段降低所需心力及滯怠時間”而獲得補償

20. 19ClassificationChapter 13. Refactroing, Reuse and Reality安全的進行重構How相信自己的功力相信compiler相信test suite相信 code review

21. 20ClassificationThank you

重構—改善既有程式的設計（chapter 12,13）

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