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Unless you have been living under a rock for the past year you might know of Travis CI, the continuous integration service for the open source community. Travis started as a single GitHub project which was a rails app and a resque background task. Compare that to 12 months later where Travis is now four separate deployable apps, uses two different rubies (1.9.2 and jruby), and comprises a total of 10 GitHub projects. Apart from looking at how Travis works now, we will also look at how it got there, and how we broke Travis up into smaller more manageable, more concise encapsulated services.
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The video titled "Deconstructing Travis" features Josh Kalderimis at Rails Conf 2012 discussing the evolution and architecture of Travis CI, a continuous integration service designed for the open-source community. Kalderimis begins by providing background on Travis CI, explaining its growth from a single GitHub project to a robust system serving over 10,300 projects. He then outlines key themes in his talk: - **Growth and Infrastructure**: Travis CI started as a simple Rails application with a worker running on a dedicated box. However, as the demand grew, the architecture needed reworking to manage increasing complexity and maintainability. - **Modular Architecture**: Kalderimis describes how they transitioned to smaller, more manageable services. Travis CI evolved into four separate deployable apps, which improved scalability and reduced coupling among components. - **Key Technologies Used**: The architecture now incorporates technologies such as VirtualBox for virtualization, JRuby for specific workflows, and RabbitMQ for message queuing, enhancing the performance of build processing. - **Handling Dependencies**: With multiple components, they faced challenges in updating shared dependencies. The use of a core module, Travis Core, was implemented to encapsulate common logic used across different services, providing a reliable way to share functionality without tight coupling. - **Adding New Features**: The architecture's complexity necessitates careful planning before implementing changes, exemplified by the addition of pull request support which required adjustments in multiple components, indicating the need for coordination and foresight with new features. - **Future Enhancements**: Kalderimis concludes by discussing plans for further improvements, such as reducing reliance on VirtualBox, potentially switching to true VM solutions and better log handling mechanisms. There is also a mention of prioritizing private repository support through upcoming enhancements to Travis Pro. In conclusion, the session showcases Travis CI's journey from a simplistic prototype to a complex service-oriented architecture designed for reliability and performance in continuous integration for open-source projects. Kalderimis emphasizes the importance of careful design and architecture in handling growth and ensuring maintainability as they continue to evolve their service.
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