Working with legacy code

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Gunnar Peipman

Technologie

About me
 Name: Gunnar Peipman
 Job: Chief Everything Officer
 Company: Peipman Consult Ltd
 Hobbies: Coding, reading, travelling, beers
 In family: boyfriend, step father and father
 Animals: white fluffy bunny
 Me & MS: ASP.NET/IIS MVP, blogger, speaker
 Community: ENETA (www.eneta.ee)
 http://weblogs.asp.net/gunnarpeipman/
 E-mail: me@gunnarpeipman.com

Agenda
 What is legacy code and where it comes from?
 How to fight back?
 Tools and techniques
 Examples
 Questions and answers

What is legacy code?
 The code we already released to users
 Code covered with no tests
 Messy code

LEGACY CODE
messyconfusing
bad dependencies
hard to read spaghetti
untestable
ugly
don‘t touch it
in production
undocumented
tricky
problematic
just works

Where legacy code comes from?
 Death march projects
 Unskilled developers
 Impossible dead-lines
 Bleeding-edge technologies
 Complex technologies
 Silver-bullet tools
 Digital slavery

Dynamics of legacy code
All problems happen every day with
small steps under our own eyes

How to fight back?
 Write readable code
 Write testable code
 Refactor
 Avoid hacks
 Look how others have solved similar problems
 Study different patterns
 Improve your coding skills
 If you find mess then clean it up

Process for single developers
Find mess
Investigate
RefactorRedesign
Validate

Process for teams
Code
review
Detect
problems
Agree on
solutions
Redesign
code
Validate

Refactoring
 Refactoring - making changes that doesn’t
change code functionality
 Different tools provided by IDE-s

Patterns
 Design patterns
 Unit testing patterns
 Analysis patterns
 Enterprise applications architecture patterns
 Enterprise integration patterns
 SOA patterns
 Universal data models

Testing
 Unit tests
 Integration tests
 Stress tests
 Performance tests
 User Interface tests
 Database tests
 Acceptance tests
 Tracer bullet tests

Quality assurance
 Automated and manual testing
 Code reviews
 Paired programming
 Set up goals for developers

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Working with legacy code

1. Working with legacy code GUNNAR PEIPMAN, ASP.NET/IIS MVP

2. About me  Name: Gunnar Peipman  Job: Chief Everything Officer  Company: Peipman Consult Ltd  Hobbies: Coding, reading, travelling, beers  In family: boyfriend, step father and father  Animals: white fluffy bunny  Me & MS: ASP.NET/IIS MVP, blogger, speaker  Community: ENETA (www.eneta.ee)  http://weblogs.asp.net/gunnarpeipman/  E-mail: me@gunnarpeipman.com

3. Agenda  What is legacy code and where it comes from?  How to fight back?  Tools and techniques  Examples  Questions and answers

4. Essentials of legacy code

5. What is legacy code?  The code we already released to users  Code covered with no tests  Messy code

6. LEGACY CODE messyconfusing bad dependencies hard to read spaghetti untestable ugly don‘t touch it in production undocumented tricky problematic just works

7. Where legacy code comes from?  Death march projects  Unskilled developers  Impossible dead-lines  Bleeding-edge technologies  Complex technologies  Silver-bullet tools  Digital slavery

8. Dynamics of legacy code All problems happen every day with small steps under our own eyes

9. War plan

10. How to fight back?  Write readable code  Write testable code  Refactor  Avoid hacks  Look how others have solved similar problems  Study different patterns  Improve your coding skills  If you find mess then clean it up

11. Process for single developers Find mess Investigate RefactorRedesign Validate

12. Process for teams Code review Detect problems Agree on solutions Redesign code Validate

13. Winning the battle

14. Refactoring  Refactoring - making changes that doesn’t change code functionality  Different tools provided by IDE-s

15. Patterns  Design patterns  Unit testing patterns  Analysis patterns  Enterprise applications architecture patterns  Enterprise integration patterns  SOA patterns  Universal data models

16. Testing  Unit tests  Integration tests  Stress tests  Performance tests  User Interface tests  Database tests  Acceptance tests  Tracer bullet tests

17. Quality assurance  Automated and manual testing  Code reviews  Paired programming  Set up goals for developers

18. Examples

19. Thank you!

20. Q&A

Working with legacy code

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