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Unpack the bag
There’s a common pattern where an object is constructed with a Context object that carries all the dependencies the new object might need. It’s often used, for example, with classes that package up...
View ArticleExpressiveness makes the difference
I was chatting with Keith about what the Software Craftsmanship event should really be about, in the context of a discussion of whether some of Jason Gorman’s list of guitar heroes are actually worth...
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SOLID Development Principles – In Motivational Pictures
Excellent series of images from Derick Bailey. Here’s an example: Single Responsibility Principle Just because you can, doesn’t mean you should. RT @Jtf
View ArticleMock Roles not Objects, live and in person.
At the recent Software Craftsmanship conference in London, Willem and Marc ran a session on Responsibility-Driven Development with Mocks for about 30 people. Nat Pryce and I were sitting at the back...
View ArticleJava synchronisation bug on OS/X?
I’ve come across what might be a synchronisation bug while working on the book. The end-to-end tests for our example application use the WindowLicker framework to drive the Swing user interface. Our...
View ArticleIWonderAboutInterfaceNames
InfoQ has just published Udi Dahan’s talk from QCon 2008 on “Intentions and Interfaces”. It’s good to see the message about focussing on Roles rather than Classes being pitched to a new audience....
View ArticleKeep tests concrete
This popped up on a technical discussion site recently. The original question was how to write tests for code that invokes a method on particular values in a list. The problem was that the tests were...
View ArticleCalling an Oracle stored procedure with a Table parameter with Spring’s...
I don’t normally do this sort of thing, but this took my colleague Tony Lawrence and me a while to figure out and we didn’t find a good explanation on the web. This will be a very dull posting unless...
View ArticleMachiavelli on code quality
As the doctors say of a wasting disease, to start with, it is easy to cure but difficult to diagnose. After a time, unless it has been diagnosed and treated at the outset, it becomes easy to diagnose...
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Is Dependency Injection like Facebook?
The problem with social networks I think there’s a description in Paul Adams’ talk about online vs. offline social networks of how Dependency Injection goes bad, particularly when using one of the many...
View ArticleAn example of an unhedged software call option
At a client, we’ve been reworking some particularly hairy calculation code. For better or worse, the convention is that we call a FooFetcher to get hold of a Foo when we need one. Here’s an example...
View ArticleTest-First Development 1968
Seeing Kevlin Henney again at the Goto conference reminded me of a quotation he cited at Agile on the Beach last month. In 1968, NATO funded a conference with the then provocative title of Software...
View ArticleAnother reason not to log directly in your code
I’ve been ranting for some time that it’s a bad idea directly to mix logging with production code. The right thing to do is to introduce a collaborator that has a responsibility to provide structured...
View ArticleOn the composeability of Hamcrest matchers
A recent discussion on the hamcrest java users list got me thinking that I should write up a little style guide, in particular about how to create custom Hamcrest matchers. Reporting negative scenarios...
View ArticleSome mocks
“I don’t use a knife when I eat, if need one it means the food hasn’t been cut up enough.” “Forks are unnecessary, I can do everything I want with a pointed knife.” [1] One of the things we realised...
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