principles:high_cohesion
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principles:high_cohesion [2020-10-12 16:15] – old revision restored (2019-05-29 14:47) 159.69.186.191 | principles:high_cohesion [2020-10-12 16:15] – old revision restored (2016-09-03 22:28) 159.69.186.191 | ||
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The cohesion of a module is a measure for how well the internal parts of a module (e.g. the methods and attributes of a class) belong together. Having a high cohesion means, that a module should only comprise responsibilities which belong together. | The cohesion of a module is a measure for how well the internal parts of a module (e.g. the methods and attributes of a class) belong together. Having a high cohesion means, that a module should only comprise responsibilities which belong together. | ||
- | Several kinds of cohesion can be distinguished some of which are strong and some of which are loose. So strong forms of coupling should be preferred. | + | Several kinds of cohesion can be distinguished some of which are strong and some of which are loose. So strong forms of coupling should be preferred: FIXME add explanation of cohesion types |
===== Rationale ===== | ===== Rationale ===== | ||
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+ | ===== Strategies ===== | ||
+ | * Divide one large module into several smaller but more cohesive ones | ||
===== Caveats ===== | ===== Caveats ===== | ||
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===== Origin ===== | ===== Origin ===== | ||
- | W. P. Stevens, | + | W. P. Stevens, |
===== Evidence ===== | ===== Evidence ===== | ||
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==== Class level cohesion ==== | ==== Class level cohesion ==== | ||
- | Robert Cecil Martin (Uncle Bob) describes | + | Robert Cecil Martin (Uncle Bob) describe |
"In general the more variables a method manipulates the more cohesive that method is to its class." | "In general the more variables a method manipulates the more cohesive that method is to its class." |
principles/high_cohesion.txt · Last modified: 2021-10-18 21:36 by christian