Architecture principles

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We can have ~7 entities in same time in mind

Architecture principles

Metrics

Optimal values: http://stackoverflow.com/questions/2033743/code-metrics-calculation-in-visual-studio

Metrics types

Weighted Methods per Class (WMC)

Sum of complexity of all class methods

http://staff.unak.is/andy/StaticAnalysis0809/metrics/wmc.html

Response for Class (RFC)

lower RFC - lower bugs

inokation complexity on message

http://staff.unak.is/andy/StaticAnalysis0809/metrics/rfc.html

What is metrics: https://msdn.microsoft.com/en-us/library/bb385914.aspx

Design Patters

Command

Chain of responsibility

wiki(ru): https://ru.wikipedia.org/wiki/%D0%A6%D0%B5%D0%BF%D0%BE%D1%87%D0%BA%D0%B0_%D0%BE%D0%B1%D1%8F%D0%B7%D0%B0%D0%BD%D0%BD%D0%BE%D1%81%D1%82%D0%B5%D0%B9

Relay messages

Principles

Law of Demetr (LOD)

Layer architecture is an implementation of LOD

Cons

Wrappers time & space overhead

Pros

Potentialy lower Response for Class (RFC) Metric

Lower dependencies between classes

Safer code change

Links

Why its needed (ru): https://toster.ru/q/44822

Wiki (en): https://en.wikipedia.org/wiki/Law_of_Demeter

Base postulates

Only talk to your immediate friends

Each unit should only talk to its friends; don't talk to stangers

Every unit should have limited knowledge about other units: only "closely" related to the current unit