A look at Continuous Integration and the most powerful CI server, Jenkins.

1. CONTINUOUS INTEGRATION
~ A GLANCE AT AGILE DEVELOPMENT AND EXTREME
PROGRAMMING~
Tran Duc Thang
Framgia 22/6/2013

2. Contents
I. Introduction to Continuous Integration
II. Practice Continuous Integration
III. Introduction to Jenkins
IV. Disadvantages

3. Introduction to CONTINUOUS INTEGRATION
Agile Development
• Agile development is a philosophy, not a
method or process.
• An Agile method is a process that support the
agile philosophy.
• One of the Agile methods is Extreme
Programming. (XP)

4. Introduction to CONTINUOUS INTEGRATION
Extreme Programming (XP)
• XP is the most prominent Agile Development method.
• XP, like other Agile Development methods, is a set of practices.
• The XP core practices
 Whole Team
 Planning Game
 Small Releases
 Customer Tests
 Simple Design
 Pair Programming
 Test-Driven Development
 Design Improvement
 Continuous Integration
 Collective Code Ownership
 Coding Standard
 Metaphor
 Sustainable Pace

5. Introduction to CONTINUOUS INTEGRATION
Continuous Integration – The concept
• one of the Agile practices ! CI was first named and proposed as part of XP. Now, many
organizations have adopted CI without adopting all of XP.
• requires developers to integrate code into a shared repository several times a day.
• each check-in is verified by an automated build, allowing teams to detect problems early.

6. Introduction to CONTINUOUS INTEGRATION
Continuous Integration – The goal
• “Continuous Integration doesn’t get rid of bugs, but it does make them dramatically
easier to find and remove.”
• To make your project able to deploy at any time !

7. Introduction to CONTINUOUS INTEGRATION
Continuous Integration feat Test-Drive Development
• CI was originally intended to be used in combination with TDD.
• CI without TDD is too risky.
• TDD without CI only proves your code work well on your own computer.

8. Practice Continuous Integration
Only one rule : NEVER BREAK THE BUILD !
• What works on your computer will work on anybody's computer. The reason like “It has been
working well on my computer” is just invalid !
• The code that has not been proven to build successfully should not appear in the mainline.

9. Practice Continuous Integration
You need a spare development machine to act as a centre integration machine. It is called
CI Server.
• https://circleci.com/
• https://drone.io/
• https://www.codeship.io/
• CruiseControl
• TeamCity
• Hudson
• Jenkins
• …

10. Introduction to Jenkins
Jenkins – An Overview
• In 2004, Kohsuke Kawaguchi started the project as a hobby project under the name of
Hudson.
• In 2011, not long after Sun was purchased by Oracle, Kohsuke Kawaguchi and many other
core developers from Hudson forked to a new project, based on Hudson. It is Jenkins.
• By 2010 Jenkins (Hudson) had dominated the Continuous Integration Solution Market, with
the market share of over 70%.
• Jenkins is now used widely by many big companies: Mozilla, LinkedIn, Motorola, eBay,
Yahoo!, Red Hat, NTT Data, Gree, DeNa …

11. Introduction to Jenkins
Why Jenkins ?
• Cross-platform tool. (written in Java)
• Large community.
• Numbers of plug-in.
• Supports many programming languages (Java, PHP, Ruby, Python …)
• IT IS AN OPEN SOURCE PROJECT. IT IS FREE !!!

12. Introduction to Jenkins
What can Jenkins do ?
• DEMO
• http://jenkins.mozilla.org/
• http://ci.jenkins-ci.org/

13. Disadvantages
Nothing is perfect. CI still has disadvantages
• Take lots of time for the initial setup, as well as the training to get acquainted with CI
server.
• Requires many resources for running CI server.
• Required high programming skill. CI can not work well without the professional
programmers who can design and write well-developed test-suites.

14. References
• http://softwaretest.jp/quality/
• http://www.thoughtworks.com/continuous-integration
• http://www.jamesshore.com/agile-book/
• http://www.ibm.com/developerworks/rational/library/continuous-integration-agile-
development/
• http://jenkins-php.org/
• …

15. CONTINUOUS INTEGRATION is more than a practice,
IT IS AN ART!