SER516 Lecture 20a

Software Agility
Dependency Metrics II
(202103)

Transcript

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   SER 516
   Software Agility
   Lecture 20: Dependency Principles II
   Dr. Javier Gonzalez-Sanchez
   javiergs@asu.edu
   javiergs.engineering.asu.edu | javiergs.com
   PERALTA 230U
   Office Hours: By appointment
   

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   Assignment 05
   § Third Sprint
   Sprint Backlog
   Burndown Chart
   Retrospective
   Review
   Product – Source Code – Clean Source Code
   Product – Class Diagram– Clean Design
   Due date Assignment 5.3 – March 30
   

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   Previously…
   Structural Quality
   

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   Principles
   1. Acyclic Dependency Principle (ADP)
   2. Stable Dependency Principle (SDP)
   3. Stable Abstraction Principle (SAP)
   

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   Stable Abstraction Principle
   

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   Abstractness of a Package
   § Express the portion of contained abstract types.
   § It is a value 0 to 1:
   0 (only concrete classes) to
   1 (only interfaces and abstract classes)
   

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   Instability of a Package
   § Indicates whether the package is mainly used by other artifacts (stable –
   hard to change) or
   if it mainly depends on other artifacts (instable – changeable).
   § It is a value 0 to 1:
   0 only incoming dependencies to
   1 (only outgoing dependencies)
   

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   • Instability = Cout
   (Cin + Cout)
   Stable Abstraction Principle
   IC
   = ?, A= ?
   IX
   = ?, A= ?
   IA
   = ?, A= ?
   

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   Instability of a Package
   § Indicates whether the package is mainly used by other artifacts (stable –
   hard to change) or
   if it mainly depends on other artifacts (instable – changeable).
   § It is a value 0 to 1:
   0 only incoming dependencies to
   1 (only outgoing dependencies)
   

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    • Instability = Cout
    (Cin + Cout)
    Stable Abstraction Principle
    IC
    = 1.0, A= ?
    IX
    = 0.5, A= ?
    IA
    = 0.0, A= ?
    

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    To be continued …
    

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    SER 516 Software Agility
    Javier Gonzalez-Sanchez
    javiergs@asu.edu
    Spring 2021
    Disclaimer. These slides can only be used as study material for the class SER516 at ASU. They cannot be distributed or used for another purpose.
    

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