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Dependency Broadcaster 13

Posted by tottinger Tue, 17 Jul 2007 01:34:00 GMT

I’m not sure if there is already a code smell name for this situation. The idea is rather like “Large Class” or “God Class” but isn’t really related to behaviour. It’s just a matter of dependency.

Michael Feathers refers to “horrible include dependencies”, and that’s the right idea.

So what if you have a class file that includes (or forward-declares) a few hundred other classes, and that class is used by almost every other class in the system?

This is perhaps what comes from writing a very class-rich architectural layer as a single class.

Mainly the idea is that the class takes a lot of ugly dependencies and spreads them evenly over the application. I would call that “broadcasting” although the correct agrarian term is “manure spreader.” I will stick with the less evocative “dependency broadcaster.”

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    Sebastian Kübeck about 13 hours later:

    I’d rather call it “Widow Maker”. Whoever is assigned to fix it will inevitably break the whole system…

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    Steve Lewis about 15 hours later:

    I see this as a type of “Global Hub”

    A Component Global Hub is a structural antipattern for a component that has many global dependencies and many global dependents. A global hub is often affected when anything is changed, and it affects a significant percentage of the system when it changes. Global hubs are undesirable because they indicate fragility and lack of modularity in the system.

    fn1.http://publib.boulder.ibm.com/infocenter/rtnlhelp/v6r0m0/index.jsp?topic=/com.ibm.r2a.archdisc.doc/topics/rstructuralpatterns.html

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