Single Responsibility Principle @ AgileCamp Feb, 27 2010

SRP Andrea Francia

What is SRP?
Why you should apply SRP?
Why you shouldn’t apply SRP?

The Principle
Single Responsibility Principle:
“ A class should have only one reason to change”
from the PPP Book: “Agile Software Development Principle, Patterns, and Practice” by Robert C. Martin

Problems without SRP
Problems:
Linking of gui.lib in CalcApp
If a change in GraphApp forces a change in Rectangle we may be force to rebuild, retest and redeploy CalcApp.

Applying SRP
Is better? Depends
More Complex
Less Fragile … but in respect of what type of change?

Violation example: use of wxWidgets instead of wxBase

Violation example: bad use of wxWidgets
Solution: extract responsibiliy

Too much SRP

Bad use of JPA Entities

Thanks
Andrea Francia
[email_address]
http:// www.andreafrancia.it /
http:// blog.andreafrancia.it /

Single Responsibility Principle @ AgileCamp Feb, 27 2010

by Andrea Francia on Feb 27, 2010

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Single Responsibility Principle @ AgileCamp Feb, 27 2010 — Presentation Transcript