you are misusing iff :/

@asdf—how so? I’ve always understood that ‘iff’ expands to ‘if and only if’, which makes sense in Uncle Bob’s sentence.

How do you keep the crap factor low on business objects?

If I have an object designed for holding patient data, typically used for sending data to the database layer or some OR-mapping entity class, this will largely be composed of properties with get- and set-methods, and a few of them might have simple logic, thus driving the cyclomatic complexity up. Do you just test the hell out of it to keep the crap factor down?

This patient class may not be the SRP-purists favourite class, but dividing this type of class into smaller ones will only cause more greef when I need the entire Patient object as input parameter to a method. Another problem emerging when making business objects comply with the SRP is that introducing several more specialised patient objects will probably force me to increase the number of parameters for most functions, which is also a bad thing. So, do I have it all backwards, or is there some special principle for business objects?

At what CRAP number is a method considered a crappy method?

Bjørn,

as a first step, you cold try to refactor the patient class into an inheritance chain. That way, you can increase cohesion AND preserve the interface by passing the bottom class around. That way, you don’t need to change the clients. In a further step, you could figure out which client uses which methods of the bottom class, change access to classes up the chain and finally refactor the inheritance chain into a tree. I have done this a couple of times and it worked pretty well. In my experience, those kinds of classes you mention tend to get bloated quickly and the sooner you step in, the easier it is to break up the class.

You might also have a look into Michael Feathers’ book “Working Effectively with Legacy Code” and Joshua Kerievsky’s book “Refactoring to Patterns” for further information.

Sebastian, Thank you for the tip, I’ll check out the books mentioned.

About the inheritance chain, I must admit I am sceptical. This is probably because I have seen the results of inheritance-mania at the previous company I worked at. They had migrated from java to .net, and still had some maintenance responsibility of the java code. Most of that code was written over a period of 10 years, and most of those 10 years were part of the “cowboy era” of the company. Long story short: I don’t think I’m lying to much if I estimate that you could find anything from 2 to 8 levels of inheritance. Refactoring, adding new features or introducing new developers to the code were all daunting tasks.

However, I do agree that inheritance, used with caution, is one possible solution to this particular situation. Any other suggestions?

Bjørn,

you can turn everything into a nightmare if you try hard enough ;-). However, inheritance (+delegation) helped me with the problem you mention. If you need further information you could place your question at stackoverflow.

Good luck!

When coverage is 100%, Crap == CC. If you have simple logic in your business object, then CC will be around 3 or 4. So Crap will be very low. So, yes, test the hell out of it.

We need CRAP4.net

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