Recently a colleague asked me why I’m so against using singletons… why do I think they’re so bad. The answer is quite simple… when you use a singleton you’re essentially saying that your object accepts this dependency and only this dependency, it will take no substitutes. Since the dependency isn’t substitutable, it’s difficult to swap [...]
Archive for the ‘Object Design’ Category
Express Your Dependencies
December 29th, 2009
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Recently I gave a presentation on Test Doubles at a client site and while fielding questions at the end, one person asked how they could use Mockito (which I used to demonstrate Test Doubles) when autowiring fields with Spring. The problem he had was he was autowiring the fields, which were private, and which had [...]
Code Comments: The Lowest Form of Communication
October 15th, 2009
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Recently I’ve been working with lots and lots of legacy code written by lots and lots of people who have been separated by lots and lots of distance between them. As a side effect, a lot of the code has comments that either explain what is going on, rationale behind doing it, and sometimes even [...]
Using AOP for Measuring Elapsed Time
December 27th, 2007
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Recently I’ve been knee deep in some legacy code doing a fair bit of refactoring, and one of the patterns I keep coming across is processes that need their elapsed time measured. You know what I’m talking about… a procedural mess shock full of primitive obsession all over, something like the following (except imagine that [...]
Taking Eiffel for a Spin
November 20th, 2006
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Lately I’ve been playing around with a multitude of languages, hoping to not only have yet more to add to my list of fluent languages to brag about, but to also gain further insight in other implementations and design from them. For this reason, I decided to play with Eiffel over the weekend.
OOPSLA 2006: Design Fest Round 2
November 4th, 2006
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As I mentioned earlier, I had attended the day long DesignFest session at OOPSLA my first day there. Since the whole experience picqued my interest, I decided to go ahead and attend a second session on Tuesday afternoon in an effort to perhaps inject myself more, and give it another shot. I spotted Eric Evans [...]
