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Posted by Mirko Stocker on Nov 05, 2009
Caliper provides metrics for Ruby projects, and it couldn't be any easier: just point Caliper to your Git repository, wait for a few seconds, and see how fit your code is.
Caliper is a free service provided by Devver, the company known for their test acceleration service (see Faster Ruby Test Execution With Devver on InfoQ). The calculation of the various metrics is done by metric_fu, wich in turn uses tools like Roodi (warns about design issues) and Saikuro (a cyclomatic complexity analyzer). Caliper aggregates all these data and provides a nice overview. For an example, take a look at these Sinatra hot spots.
Benjamin Brinckerhoff from Devver told us that they plan to integrate even more metrics:
We're not entirely sure which ones we'll add yet. This largely depends upon the responses we hear from our users. However, here are some ideas.
When we add these tools, we plan to add them to metric_fu as well (assuming the metric_fu teams agrees they would be good additions!). In the meantime, we're working hard to make the existing metric_fu data easier to understand and work with.
- Towelie, detects duplication, similar to Flay.
- rcov, already included in metric_fu, but not yet supported by Caliper.
- Railroad, class diagram generator.
- TODO detector, determines which files have the most instances of TODO (or other strings that serve as programmer notes). The exact strings would be customizable, we'd likely build this ourselves (it should be fairly easy).
Just calculating the metrics isn't enough, the code should also be refactored afterwards. This blog on Devver shows how Caliper's metrics were used to improve its own code base. Caliper also integrates well with other services like GitHub and rdoc.info via post-commit hooks.
The service is free for open source projects, a paid service for private projects is being considered.
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Brian Marick takes us through a quick tour of the most important values and challenges to adopting Agile successfully (they aren't the typical challenges and values we hear in the community).
The line between development and architecture is tricky. Does it exist at all? Is an ivory tower actually needed? There's a balance in the middle, but how do you move from developer to architect?
The word 'authority' sometimes produces an allergic response in hard-line agilists. Freedom and authority – both are bad if misused and both are good if used in right spirit for a noble cause.
"Getting Started with Grails" brings you up to speed on this modern web framework. Companies as varied as LinkedIn, Wired, and Taco Bell are all using Grails. Are you ready to get started as well?
Those familiar with only ITIL V2 often scoff at the thought that ITIL could serve as a governance framework for SOA. With ITIL V3, the focus of the framework shifted towards service-orientation.
SpringSource CTO Adrian Colyer discusses AspectJ, SpringSource's dm Server and tc Server products, OSGi and Scrum.
Heroku's Adam Wiggins talks about Rails, Background Jobs, Add-Ons, Ruby, and how Heroku manages to work around Ruby's inefficiencies using Erlang and other languages.
For Grady Booch the foundation of a good architecture is patterns, SOA being just one of many patterns. In this Second Life presentation, Booch attempts to bring more clarity on what architecture is.
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