Code as a Crime Scene @AdamTornhill Empear AB - - PowerPoint PPT Presentation

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Code as a Crime Scene @AdamTornhill Empear AB - - PowerPoint PPT Presentation

Jan 21, 2023 132 likes •558 views

Treat Your Code as a Crime Scene @AdamTornhill Empear AB http://www.adamtornhill.com/ Understanding Code @AdamTornhill Cyclomatic Complexity @AdamTornhill Syntactic complexity metrics cannot capture the whole picture of software

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SLIDE 1

Treat Your

Code as a Crime Scene

@AdamTornhill Empear AB http://www.adamtornhill.com/

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SLIDE 2

Understanding Code

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SLIDE 3

@AdamTornhill

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SLIDE 4

Cyclomatic Complexity

@AdamTornhill

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SLIDE 5

“Syntactic complexity metrics cannot capture the whole picture of software complexity” (Herraiz & Hassan) “The use of metrics to manage software projects has not even reached a state of infancy” (Glass)

@AdamTornhill

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Intuition Doesn’t Scale

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SLIDE 7

Forensic Psychology

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SLIDE 8
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SLIDE 9

G e

  • g

r a p h i c a l

O f f e n d e r

P r

  • fi

l i n g

  • a

2 M i n u t e s

I n t r

  • d

u c t i

  • n
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SLIDE 10

Profiling the Ripper

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How can we use this in Code?

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A geography of code

Code City, http://www.inf.usi.ch/phd/wettel/codecity.html

@AdamTornhill

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Spatial Movement in Code

[0a05fba] Adam Tornhill 2013-09-17 Added an identity analysis as debug aid
 5 1 README.md
 5 5 src/code_maat/analysis/authors.clj
 3 4 src/code_maat/app/app.clj
 1 1 src/code_maat/core.clj
 18 1 test/code_maat/end_to_end/scenario_tests.clj

Who? When? Where!

@AdamTornhill

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Geographical profiling of Code

@AdamTornhill

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Geographical profiling of Code

Hotspot

@AdamTornhill

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SLIDE 16

Case Study

400.000 Lines of Code 89 Software Developers 18 Months 18 258 Commits to the codebase

@AdamTornhill

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SLIDE 17

From: https://pragprog.com/book/atcrime/code-as-a-crime-scene

Hotspot Hotspot

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Hotspots and Defects

7 out of 8 most defect dense parts 4% of the Code, 72% of all defects!

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Improve 4% of your code,

get rid of most defects

@AdamTornhill

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Evolution of a Program

Time

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Complexity Trend

method-to-ir.c

2010 2014 Time Complexity

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Software Development is a social activity

@AdamTornhill

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C

  • d

e Doesn’t

L i e?

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FuelInjector.cs

Temporal Coupling

Diagnostics.cs Combustion.cs Commit #1 Commit #2 Commit #3 Time

@AdamTornhill

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?

Logical coupling Physical coupling

@AdamTornhill

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Temporal Coupling

@AdamTornhill

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Conway’s Law

Legacy Code?

and

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SLIDE 28

@AdamTornhill

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Team #1 Team #2 Team #3

A Perfect World

@AdamTornhill

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Team #2 Team #3 Team #1 Team #4

@AdamTornhill

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Team #1 Team #2 Team #3 Team #4

@AdamTornhill

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Align Your Architecture and Organisation

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Number of Programmers Q u a l i t y

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Idea from: Fractal Figures: Visualizing Development Effort for CVS Entities (D’Ambros, Lanza, & Gall)

Fractal Figures

@AdamTornhill

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Identify Main developers

Main Developer “Knowledge Owner”

@AdamTornhill

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Your map as a Guide

@AdamTornhill

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Team #1 Team #2 Team #3

@AdamTornhill

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Social Networks in Code

@AdamTornhill

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Loss of Knowledge

@AdamTornhill

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Abandoned subsystem

@AdamTornhill

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Code <3 Forensics

@AdamTornhill

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@AdamTornhill adam.tornhill@empear.com Empear AB

Read More: http://www.adamtornhill.com/ The Book: https://pragprog.com/book/atcrime/your-code-as-a-crime-scene