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

jgs 516 00010000 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

jgs Previously… Structural Quality

jgs 516 00010000 Principles 1. Acyclic Dependency Principle (ADP) 2. Stable Dependency Principle (SDP) 3. Stable Abstraction Principle (SAP)

jgs Stable Abstraction Principle

jgs 516 00010000 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)

jgs 516 00010000 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)

jgs 516 00010000 • Instability = Cout (Cin + Cout) Stable Abstraction Principle IC = ?, A= ? IX = ?, A= ? IA = ?, A= ?

jgs 516 00010000 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)

jgs 516 00010000 • Instability = Cout (Cin + Cout) Stable Abstraction Principle IC = 1.0, A= ? IX = 0.5, A= ? IA = 0.0, A= ?

jgs To be continued …

jgs SER 516 Software Agility Javier Gonzalez-Sanchez [email protected] 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.