Continuous Integration
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Get the skinny on Continuous Integration. What to do and what NOT to do.
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Continuous Integration
- 1. Continuous Integration Todd Papaioannou
- 2. Or, how to build software better, faster, cheaper
- 3. What??
- 4. What is CI? a development methodology of daily developer integrations verified by automated builds
- 5. What is it not? nightly builds developer branches scheduled Integration Points building via IDEs
- 6. Continuous Compilation != Continuous Integration
- 7. ‘Fraid Not!
- 8. Why do it?
- 9. Building software can be a risky business
- 10. Risk 1: Fixing bugs late is costly Source: http://www.agitar.com/solutions/ why_unit_testing.html
- 11. So why is most software built Requirements this way? Design Implementation Testing
- 12. Risk 2: Lack of team cohesion “Your changes to Bar are incompatible with mine. How do we merge now?” “When did we decided to upgrade to version 2.0-alpha of the Super library??” “I thought you fixed that 2 months ago!”
- 13. Risk 3: Poor quality code base “We have 3 classes doing the same thing??” “Everybody knows double checked locking is a Bad Idea!” “Why can’t I just include Foo and not require all of the other 13 libs?”
- 14. Risk 4: Lack of project visibility “What do you mean the tests are failing?” “What’s in version 1.2.3 of the build?” “What’s our code coverage now?
- 15. Risk 5: Lack of deployable software “It works on my machine!” “I need a new build to test with” “The [boss|customer|patron] is coming, we need to demo progress asap”
- 16. Use Continuous Integration to reduce the risks
- 17. Wait! Didn’t you say better, faster, cheaper?
- 18. Better Build better quality software That is tested early and often That adheres to best practices and coding standards
- 19. Faster Test in parallel, not at the end No integration points Builds become a non event
- 20. Cheaper Identify defects earlier Fix when least costly Easily repeatable testing
- 21. So what constitutes a build?
- 22. Compilation != A Build
- 23. Build Ingredients Compilation Test execution Database integration Code inspection Automated deployment Documentation generation
- 24. Compilation Ensures code actually compiles On every target platform
- 25. Test Execution Ensures product functions as expected Through repeatable testing
- 26. DB Integration Ensures DB and code in sync Automates (re)creation of DB and test data
- 27. Code Inspections Ensures a healthy code base Identifies problems early Enforces best practices
- 28. Automated Deployment Products can be released anytime Continually demo-able state Eliminates “works on my machine”
- 29. Documentation Generation Ensures documentation is current Removes burden from developers Produces build reports and metrics
- 30. How do I get started?
- 31. When do I build? At every check-in Every time a dependency changes
- 33. How do I build? Use a single build script That can run from the cmdline Do not depend on an IDE
- 34. Do it continuously Use a dedicated CI server, not cron Trigger on all daily check-ins Not [only] at midnight
- 35. Pay attention to your builds Provide immediate feedback Make it easily accessible Require no developer effort
- 36. Metrics Matter Identify key metrics and track them visually Act on them immediately
- 37. The 7 step program
- 38. Learn it, Use it!
- 39. Step 1 Commit Early, Commit Often
- 40. Step 2 Never commit broken code
- 41. Step 3 Fix build failures immediately
- 42. Step 4 Fail Fast
- 43. Step 5 Act on metrics
- 44. Step 6 Build in every target environment
- 45. Step 7 Create artifacts from every build
- 46. print me! 1. Commit Early, Commit Often 2. Never Commit Broken Code 3. Fix build failures immediately 4. Fail Fast 5. Act on metrics 6. Build in every target environment 7. Create artifacts from every build
- 47. Summary
- 48. Continuous Integration can help you build better quality software faster, with more confidence
- 49. Start using it!
- 50. The End
- 51. Roll the Photo Credits http://www.flickr.com/photos/24263322@N05/2403969648/ http://www.flickr.com/photos/destinme/1267500829/ http://www.flickr.com/photos/legacyalive/891467616/ http://www.flickr.com/photos/tizianoj/1294103746/ http://www.flickr.com/photos/xeophin/2181342710/ http://www.flickr.com/photos/booddin/2190614236 http://www.flickr.com/photos/thomashawk/176219254 http://www.flickr.com/photos/7446536@N03/430561725 http://www.flickr.com/photos/gallerisager/471366272 http://www.flickr.com/photos/mccain007/2092664145