Code refactoring with symfony2

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Part 1 - Refactoring 101 What is refactoring? Reasons to Refactor Refactor v.s. Rewrite From developers view Part 2 - A Case Study: X2R What is X2R and What it does? Reasons to Refactor in X2R Code review in X2R component - USS Refactoring USS with symfony2

Software

Code refactoring
with symfony2
蘇展 (bookjan)
2015/3/14

bookjan
Linkedin：https://www.linkedin.com/in/bookjan
E-mail：johnsonsu@iis.sinica.edu.tw
TEL： (02) 2788-3799 ext. 1478

In This Talk
• Part 1 - Refactoring 101
• What is refactoring?
• Reasons to Refactor
• Refactor v.s. Rewrite
• From developers view
• Part 2 - A Case Study: X2R
• What is X2R and What it does?
• Reasons to Refactor in X2R
• Code review in X2R component
- USS
• Refactoring USS with symfony2

https://www.ﬂickr.com/photos/katy_tresedder/4902791464/

• Code is duplicated.
• A function is too long.
• A loop is to long or too deeply nested.
• Global variables are used.
• A function has a poor name.
• Comments are used to explain difﬁcult code.
• And more…
Code Complete - Chapter 24

• Code refactoring is the process of restructuring
existing computer code - without changing its external
behavior. (Wikipedia)
• “a change made to the internal structure of the soft-
ware to make it easier to understand and cheaper to
modify without changing its observable
behavior” (Fowler 1999).
Code Refactoring
https://www.ﬂickr.com/photos/pascalbrax/5429971163

Code Rewrite
A rewrite in computer programming is the act or result
of re-implementing a large portion of existing
functionality without re-use of its source code or
writing inscription.

From developers view
Refactor v.s. Rewrite
http://www.groomers-online.com/news/wp-content/uploads/2013/04/dog-computer.jpg

Rewrite
http://wallpaperist.net/ﬁle/413/dogs-animals-computer-bald.jpg

Refactor
http://www.graphics99.com/funny-dog-with-laptop-picture/

Part 2 -
A Case Study for Refactoring with symfony2 :
鏈結資料轉換⼯工具 (X2R)

沒有 X2R 的狀況
開發者
CSV
XML
JSON
RDF
觀測資料
氣象局
⽔水利署
地球所
csv2rdf4lod
Open
Refiner
RDF
Translator
針對不同來源不同格式的資料，
要去學習各種 RDFizer 的設定
跟使⽤用。︒
RDFizers
Raw Data

沒有 X2R 的狀況
開發者
要學習
SPARQL
語⾔言
還要到不同的
Endpoints
去找合⽤用的 URIs
Endpoints

X2R - Workflow
開發者
開發者可以把
上述的繁瑣步驟，
通通交給 X2R
輸入既有資料
輸出鏈結資料
X2R 幫開發者處理
中間繁瑣的步驟

現有資料
(多種不同格式，利
⽤用變數 X 表⽰示)
鏈結資料
(RDF，利⽤用
開頭字母 R表⽰示)
X R2
轉換成
(To ~⾳音同~ Two)
X2R
幫助程式設計師輕鬆地將現有資料轉換成
⾼高品質的鏈結資料

A brief of code review in X2R
components:
URI Search Service (USS)

24
Input: search term
1. - Compose query and ﬁlter the endpoint-list
to extract requested endpoint URL.
Loop
2.1 - Connect individual endpoint and send
query
Loop
2.2 - Integrates resultsLoop
Output: Results

A brief of demo:
URI Search Service (USS)

The Refactoring Strategies in general
• Easy to maintain both Front&Back end
• Separate different classes and function
• restructuring existing code and logic
• DRY - Don’t repeat yourself

The Refactoring Strategies in Symfony2
• MVC - Model-View-Control pattern
• Modularized - Reusable functions of X2R
• Symfony2 Components

A brief of Demo after
refactoring with symfony2

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歡迎⾮非商業⺫⽬目的的重製、散布或修改本簡報的內容，但請標明：
(1)原作者姓名；(2)本簡報標題；(3)演講⽇日期。
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THANK YOU
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Phone: 02-2788-3799 ext. 1478

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Code refactoring with symfony2

1. Code refactoring with symfony2 蘇展 (bookjan) 2015/3/14

2. bookjan Linkedin：https://www.linkedin.com/in/bookjan E-mail：johnsonsu@iis.sinica.edu.tw TEL： (02) 2788-3799 ext. 1478

3. In This Talk • Part 1 - Refactoring 101 • What is refactoring? • Reasons to Refactor • Refactor v.s. Rewrite • From developers view • Part 2 - A Case Study: X2R • What is X2R and What it does? • Reasons to Refactor in X2R • Code review in X2R component - USS • Refactoring USS with symfony2

4. Part 1 - Refactoring 101

5. What is Refactoring?

6. https://www.ﬂickr.com/photos/katy_tresedder/4902791464/

7. Reasons to Refactor?

8. • Code is duplicated. • A function is too long. • A loop is to long or too deeply nested. • Global variables are used. • A function has a poor name. • Comments are used to explain difﬁcult code. • And more… Code Complete - Chapter 24

9. Refactor v.s. Rewrite

10. • Code refactoring is the process of restructuring existing computer code - without changing its external behavior. (Wikipedia) • “a change made to the internal structure of the software to make it easier to understand and cheaper to modify without changing its observable behavior” (Fowler 1999). Code Refactoring https://www.ﬂickr.com/photos/pascalbrax/5429971163

11. Code Rewrite A rewrite in computer programming is the act or result of re-implementing a large portion of existing functionality without re-use of its source code or writing inscription.

12. From developers view Refactor v.s. Rewrite http://www.groomers-online.com/news/wp-content/uploads/2013/04/dog-computer.jpg

13. Rewrite http://wallpaperist.net/ﬁle/413/dogs-animals-computer-bald.jpg

14. Refactor http://www.graphics99.com/funny-dog-with-laptop-picture/

15. Part 2 - A Case Study for Refactoring with symfony2 : 鏈結資料轉換⼯工具 (X2R)

16. 沒有 X2R 的狀況開發者 CSV XML JSON RDF 觀測資料氣象局⽔水利署地球所 csv2rdf4lod Open Refiner RDF Translator 針對不同來源不同格式的資料，要去學習各種 RDFizer 的設定跟使⽤用。︒ RDFizers Raw Data

17. What is X2R and What it does

18. 沒有 X2R 的狀況開發者要學習 SPARQL 語⾔言還要到不同的 Endpoints 去找合⽤用的 URIs Endpoints

19. X2R - Workflow 開發者開發者可以把上述的繁瑣步驟，通通交給 X2R 輸入既有資料輸出鏈結資料 X2R 幫開發者處理中間繁瑣的步驟

20. 現有資料 (多種不同格式，利⽤用變數 X 表⽰示) 鏈結資料 (RDF，利⽤用開頭字母 R表⽰示) X R2 轉換成 (To ~⾳音同~ Two) X2R 幫助程式設計師輕鬆地將現有資料轉換成⾼高品質的鏈結資料

21. Reasons to Refactor in X2R

22. • Code is duplicated. • A function is too long. • A loop is to long or too deeply nested. • Global variables are used. • A function has a poor name. • Comments are used to explain difﬁcult code. • And more… Code Complete - Chapter 24

23. A brief of code review in X2R components: URI Search Service (USS)

24. 24 Input: search term 1. - Compose query and ﬁlter the endpoint-list to extract requested endpoint URL. Loop 2.1 - Connect individual endpoint and send query Loop 2.2 - Integrates resultsLoop Output: Results

25. A brief of demo: URI Search Service (USS)

26. The Refactoring Strategies in general • Easy to maintain both Front&Back end • Separate different classes and function • restructuring existing code and logic • DRY - Don’t repeat yourself

27. The Refactoring Strategies in Symfony2 • MVC - Model-View-Control pattern • Modularized - Reusable functions of X2R • Symfony2 Components

28. A brief of Demo after refactoring with symfony2

29. Thank You!

30. Q & A

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