Refactoring

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presentation about the tecnhical refactoring in english.

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Refactoring

  1. 1. AS – Global Business Services Refactoring For Programmers Camilo Lopes Brazilian Java AS Competency 12/12/08 © 2007 IBM Corporation
  2. 2. AS – Global Business Services Topics to be addressed  Objective  Why Refactoring?  What is Refactoring ?  Advantage  When Refactoring  Tools  Results  Example Java  Questions © 2007 IBM Corporation 2 Brazilian Java AS Competency 12/12/08
  3. 3. AS – Global Business Services Objective Assist in the development of system Object Oriented implements in the Java language that have fall reusability of code, maintaining hard and the add or adequacy of news requirement sue a lot of work of engineer Software, programmer, Analyst System, points that can generate big cost the project. © 2007 IBM Corporation 3 Brazilian Java AS Competency 12/12/08
  4. 4. AS – Global Business Services Time x Spent Time Spent Picture 1 believe that about 50% of time of an engineer Software is spent with task of maintaining and comprehension of code. Fonte: Maia (2004) © 2007 IBM Corporation 4 Brazilian Java AS Competency 12/12/08
  5. 5. AS – Global Business Services Cost x Spent Cost Spent Picture 2 The long of last three decade more of 60% of cost of development of Software of enterprise was spent with © 2007 IBM Corporation 5 Brazilian Java AS Competency 12/12/08
  6. 6. AS – Global Business Services Why Refactoring? Refactoring help the become the code more legible and solve problem of bad code write © 2007 IBM Corporation 6 Brazilian Java AS Competency 12/12/08
  7. 7. AS – Global Business Services Definition Refactoring Refactoring is the process of re-structure the system without change your functionality (Fowler,2004). © 2007 IBM Corporation 7 Brazilian Java AS Competency 12/12/08
  8. 8. AS – Global Business Services Motive to use Refactoring  Improve the project Software  Have a Software easier of comprehension the level code  Programmer faster © 2007 IBM Corporation 8 Brazilian Java AS Competency 12/12/08
  9. 9. AS – Global Business Services Advantage  The technical of refactoring can be applicate in the development and maintaining of Software;  Refactoring possibility the add of new functionality of mode easy averting the re-structure of code;  With the use of refactoring spent less time possible in maintaining the level code, improve the legibility and structure the code. © 2007 IBM Corporation 9 Brazilian Java AS Competency 12/12/08
  10. 10. AS – Global Business Services Tools  Xrefactoring: the languages compatible are C and Java this tools possibility the generation of documentation on format HTML;  RefactorIT: is a tools to refactoring that can be integrate in several IDEs.  Jfactor: is a tools that permit the application automatic of refactoring the program in Java. © 2007 IBM Corporation 10 Brazilian Java AS Competency 12/12/08
  11. 11. AS – Global Business Services When Refactoring ?  Code duplicate;  Method long;  Comments superfluous;  Command switch © 2007 IBM Corporation 11 Brazilian Java AS Competency 12/12/08
  12. 12. AS – Global Business Services Results  Easy in the process of maintaining and development of Software;  Can be applicate the any language Oriented Object;  Become the Software flexible to add of new functionality without re-structure of code;  Maintain the behavior of Software; © 2007 IBM Corporation 12 Brazilian Java AS Competency 12/12/08
  13. 13. AS – Global Business Services Example – Substitute a number literal by constant symbolic  Are numbers with value special in system;  Sometimes are use in more of a place;  To make the reading and comprehension  double energiaPotencial(double massa, double altura{ return massa * 9.81 * altura; } // code do not refactoring © 2007 IBM Corporation 13 Brazilian Java AS Competency 12/12/08
  14. 14. AS – Global Business Services Code Factored static final double CONSTANTE_GRAVITACIONAL = 9.81; double energiaPotencial(double massa, double altura){ return massa * CONSTANTE_GRAVITACIONAL * altura; } MECHANICS declare a constant and attribute a value to number literal; find where this number appear; see if the change can be to do, case positive change the number by constant; compile and test. © 2007 IBM Corporation 14 Brazilian Java AS Competency 12/12/08
  15. 15. AS – Global Business Services Questions?! Thanks! http://camilolopes.wordpress.com © 2007 IBM Corporation 15 Brazilian Java AS Competency 12/12/08
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