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principles:low_coupling [2013-01-15 11:17] – pragprog christianprinciples:low_coupling [2021-09-02 20:34] – old revision restored (2021-03-29 03:10) 65.21.179.175
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 ===== Strategies ===== ===== Strategies =====
  
 +  * Indirection: 
 +  * Dependency Inversion/Abstract Couplings:
 +  * Use lower form of coupling:
 +  * Merge modules:
 +  * Hide information
  
 ===== Origin ===== ===== Origin =====
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 ==== Specializations ==== ==== Specializations ====
  
-  * [[principles:Information Expert]] +  * [[Tell, don't Ask/Information Expert]] (TdA/IE): Adhering to the information expert principle leads to low coupling as there is less need to communicate with other modules to get the necessary information. 
-  * [[principles:Constantine's Law]]+  * [[Constantine's Law]]: Constantine's Law is just the combination of the two principles LC and HC. 
 +  * [[Dependency Inversion Principle]] (DIP): LC aims at reducing the dependencies to other modules. One way to do so is to only depend on abstractions. DIP is about this aspect.
  
 ==== Contrary Principles ==== ==== Contrary Principles ====
  
-  * [[principles:Keep It Simple Stupid]]: Reducing the coupling often involves the use of complicated interaction patterns, indirections, etc.+  * [[Keep It Simple Stupid]] (KISS): Reducing the coupling often involves the use of complicated interaction patterns, indirections, etc. 
 +  * [[High Cohesion]] (HC): A system consisting of one single module has a very low coupling as there are no dependencies on other modules. But such a system also has low cohesion. The other extreme, very many highly cohesive modules, naturally has a higher coupling between the modules. So here a compromise has to be found.
  
 ==== Complementary Principles ==== ==== Complementary Principles ====
  
-  * [[principles:High Cohesion]] +  * [[Model Principle]] (MP): LC aims at reducing the dependencies to other modules. So a module shall depend on only a few others. MP now tells which dependencies are allowed and which aren't. 
-  * [[principles:Model Principle]]+  * [[Information Hiding/Encapsulation]] (IH/E): Higher forms of couplings (especially content couplings) break encapsulation.
  
 ==== Principle Collections ==== ==== Principle Collections ====
principles/low_coupling.txt · Last modified: 2021-10-18 21:49 by christian