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srp analysis
Spotting multiple responsibilies in your design
Most of the time, you can spot classes that aren’t using the SRP
with a simple test:
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On a sheet of paper, write down a bunch of lines like this: The [blank]
[blanks] itself. You should have a line like this for every method in the class
you’re testing for the SRP.
In the first blank of each line, write down the class name. In the second
blank, write down one of the methods in the class. Do this for each
method in the class.
Read each line out loud (you may have to add a letter or word to get it to
read normally). Does what you just said make any sense? Does your class
really have the responsibility that the method indicates it does?
156 Chapter 5
If what you’ve just said doesn’t make sense,
then you’re probably violating the SRP with that
method. The method might belong in a different
class—think about moving the method.
SRP Analysis for
Write the class name
in this blank, all the
way down the sheet.
The itself.
The itself.
The itself.
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Write each method
from the class in this
blank, one per line.
Repeat this line for each
method in your class.
Here’s what your
SRP analysis sheet
should look like.