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by unclebobmartin
4419 days ago
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SRP is very simple. If two different people want to change a class for two different reasons, then pull those reasons into two different classes. That is the SRP. Example: A class that analyzes a data stream and prints a report. The data analysis will interest one group of people. The format of the report will interest another, different, group. The first group will ask for changes to the algorithms. The second will ask for changes to the format. The principle says to separate those two concerns. This goes all the way back to David Parnas and the separation of concerns. His papers that describe it are freely available on the web. I suggest that they be studied, because they are full of wisdom and insight. |
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>SRP is very simple...different people want to change a class for ... different reasons...
Back in October 2009, in https://sites.google.com/site/unclebobconsultingllc/getting-... I asked you a question on the SRP and you replied as follows:
"SRP says to keep together things that change for the same reason, and separate things that change for different reasons. Divergent change occurs when you group together things that change for different reasons. Shotgun surgery happens when you keep apart those things that change for the same reason. So, SRP is about both Divergent Change and Shotgun Surgery. Failure to follow SRP leads to both symptoms."
Has the avoidance of Shotgun Surgery taken a back seat?
Philip