CSC309 Lecture 02

Software Engineering II
Software Metrics: Structural Quality
(202404)

Transcript

1. jgs CSC 309 Software Engineering II Lecture 02: Software Metrics: Structural Quality Dr. Javier Gonzalez-Sanchez javiergs@calpoly.edu www.javiergs.com Building 14 -227
2. jgs Previously …
3. jgs Javier Gonzalez-Sanchez | CSC 309 | Winter 2023 | 3 code Key Ideas CSC 309 idea requirements architecture design quality measure
4. jgs Javier Gonzalez-Sanchez | CSC 309 | Winter 2023 | 4 Metrics Size LOC eLOC lLOC Understandability Comments Whitespaces Complexity Average, Max, Min LOC Cyclomatic Complexity Software Metrics
5. jgs Structural Metrics
6. jgs Javier Gonzalez-Sanchez | CSC 309 | Winter 2023 | 7 Example A
7. jgs Javier Gonzalez-Sanchez | CSC 309 | Winter 2023 | 8 Example B
8. jgs Abstractness
9. jgs Javier Gonzalez-Sanchez | CSC 309 | Winter 2023 | 11 § 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) Abstractness of a Package
10. jgs Instability
11. jgs Javier Gonzalez-Sanchez | CSC 309 | Winter 2023 | 13 § Indicates whether (a) the item is mainly used by others (stable – hard to change); or (b) it mainly depends on other items (instable – changeable). § It is a value between 0 and 1: 0 only incoming dependencies to 1 (only outgoing dependencies) Instability
12. jgs Distance
13. jgs Javier Gonzalez-Sanchez | CSC 309 | Winter 2023 | 15 § Distance: how far a package is away from the Main Sequence § D = A + I – 1 § Values -1 to 1 § Absolute Distance |D| Distance
14. jgs Javier Gonzalez-Sanchez | CSC 309 | Winter 2023 | 16 Stable Abstraction Principle Abstract concrete Stable Hard to Change Only incoming dependencies Unstable Changeable Only outgoing dependencies
15. jgs Test Yourselves
16. jgs Javier Gonzalez-Sanchez | CSC 309 | Winter 2023 | 18 Question project3.common.model project3.client.UI project3.server.controller
17. jgs Javier Gonzalez-Sanchez | CSC 309 | Winter 2023 | 19 Question
18. jgs Javier Gonzalez-Sanchez | CSC 309 | Winter 2023 | 20 Questions
19. jgs Javier Gonzalez-Sanchez | CSC 309 | Winter 2023 | 21 Office Hours Tuesday and Thursday 3 - 5 pm But an appointment required Sent me an email – javiergs@calpoly.edu
20. jgs
21. jgs CSC 309 Software Engineering II Lab 02: Structural Metrics Dr. Javier Gonzalez-Sanchez javiergs@calpoly.edu www.javiergs.com Building 14 -227 Office Hours: By appointment
22. jgs Javier Gonzalez-Sanchez | CSC 309 | Winter 2023 | 24 Think about this Calculate metrics for your final project in CSC 308
23. jgs Javier Gonzalez-Sanchez | CSC 309 | Winter 2023 | 25 Let’s Work
24. jgs CSC 309 Software Engineering II Javier Gonzalez-Sanchez, Ph.D. javiergs@calpoly.edu Winter 2023 Copyright. These slides can only be used as study material for the class CSC308 at Cal Poly. They cannot be distributed or used for another purpose.