The larger a project gets, often the more the developers think about
being able to refactor, reuse, and integrate across developers and
Launchpad is a large, ambitious project that offers to connect the
open-source community from the upstream libraries to the downstream
applications. For a given project, it can provide bug trackers, code
hosting, translation management, blueprint management and more, all with
relations between other projects, even incorporating externally hosted
bug trackers and code repositories.
When the project leads first approached the problem, they settled on
using a dynamic language, Python, for development speed; combined with a contract-based component architecture, as provided by a few Zope 3 libraries, to promote refactoring, reuse, and integration.
The talk will quickly introduce the basic ideas of the component
architecture libraries used.
It will then discuss how the decision to use a component architecture
led to gains, losses, and opportunities for refactoring in the newly
open-sourced Launchpad code. The story suggests when a component
architecture might be a win, and when not; and what further development might help the use of these particular libraries. One highlight of this discussion will be the way the application leverages the component architecture to provide a REST web service, using open-sourced libraries created by Launchpad developers.
The talk will close with pointers to other examples of how parts of the Zope 3 component architecture libraries are used in some current web frameworks (Plone, Trac, Twisted, Grok, Repoze); and a brief, concrete (code) example of how they might be integrated smoothly into other frameworks such as Django.
Gary Poster is a Senior Web Developer on the Foundations team of Canonical’s Launchpad project. He has previously been a Senior Software Engineer and team lead at Zope Corporation, a Senior Internet Developer at AOL Time Warner, and a professional, classically-trained opera singer.
He has contributed to many open-source projects, including BuildBot, ReportLab, ClientForm, and Zope, and is the author of numerous open-source Python packages. Gary was the primary technical reviewer of the primary book on the Zope 3 libraries, Philipp von Weitershausen’s Web Component Development with Zope 3.
Gary has taught graduate level programming courses, as well as music theory and voice lessons. Now, based in Fredericksburg, VA, he tries to teach his two boys whatever they are willing to learn.
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