principles:low_coupling
Differences
This shows you the differences between two versions of the page.
| Both sides previous revisionPrevious revision | Next revisionBoth sides next revision | ||
| principles:low_coupling [2013-08-10 12:23] – [Description Status] christian | principles:low_coupling [2013-11-06 16:43] – [Rationale] christian | ||
|---|---|---|---|
| Line 46: | Line 46: | ||
| If a module //A// interacts with a module //B//, there is a certain dependency between these modules. When for example //A// uses a certain functionality of //B//, then //A// depends on //B//. //A// makes the assumption that //B// provides a certain service, and moreover it makes assumptions on how this service can be used (by which mechanism, which parameters, etc.). If one of these assumptions is not true anymore because //B// has changed for some reason, //A// also has to change. So the fewer dependencies there are, the less likely it is that //A// stops working and has to be changed. | If a module //A// interacts with a module //B//, there is a certain dependency between these modules. When for example //A// uses a certain functionality of //B//, then //A// depends on //B//. //A// makes the assumption that //B// provides a certain service, and moreover it makes assumptions on how this service can be used (by which mechanism, which parameters, etc.). If one of these assumptions is not true anymore because //B// has changed for some reason, //A// also has to change. So the fewer dependencies there are, the less likely it is that //A// stops working and has to be changed. | ||
| - | Furthermore //A// makes many and detailed assumptions about //B//, there is also a high probability that //A// has to change despite only relying one one other module. This is because in such a case //A// also needs to change when only a certain detail of //B// changes. | + | Furthermore |
| But if coupling is low, there are only few assumptions between the modules which can be violated. This reduces the chance of [[glossary: | But if coupling is low, there are only few assumptions between the modules which can be violated. This reduces the chance of [[glossary: | ||
principles/low_coupling.txt · Last modified: 2021-10-18 21:49 by christian