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Le 12 pratiche Un introduzione a XP

Andrea Francia mini IAD di Vimercate (11 febbraio 2017)

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Cos’è XP?

@andreafranciaRoyce, Winston (1970), "Managing the Development of Large Software Systems" (PDF), Proceedings of IEEE WESCON, 26 (August): 1–9

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@andreafranciaKent Beck. 1999. Extreme Programming Explained: Embrace Change

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What if?

Kent Beck. 1999. Extreme Programming Explained: Embrace Change

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Ok ma da dove si comincia?

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Cominciamo dalle pratiche

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Chi sei?Andrea Francia

• Programmatore

• Appassionato di TDD

• Studio Agile da 8 anni

• Uso XP quotidianamente da 4 anni

• Coordino il TDD Milano

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XP -vs- Scrum

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XP Scrum

(about programming) (anything)

Iterations Sprints

Planning Game Sprint Planning Meeting

Stories/Cards Product Backlog Items

Not so fixed Fixed Sprint Backlog

Engineering Practices See XP

Engineering Practices: TDD, Pair Prorgramming, Simple Design, Refactoring

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Le pratiche classiche

@andreafranciahttp://ronjeffries.com/xprog/what-is-extreme-programming/

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Quante sono le 12 pratiche?

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Quante sono le pratiche XP?

12!1999

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Quante sono le pratiche XP?

13!2002

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Quante sono le pratiche XP?

13!

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24! 2004

Quante sono le pratiche XP?

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un momento…

• e la retrospettiva?

• … ci sono anche le pratiche Scrum!

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~50

Le pratiche che possono portare vantaggio ad un team XP sono …

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Questo libro le spiega quasi tutte:

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Pratiche “Business”

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Small Releases

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Small Releases“Every release should be as small as possible,

containing the most valuable business requirements”

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Planning Game

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Planning Game

• Quickly determine the scope of the next release by combining business priorities and technical estimates. As reality overtakes the plan, update the plan.

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Acceptance Tests

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Acceptance Tests

“The details about the user stories are captured in the form of acceptance tests specified by the customer.”

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Customer On-Site

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Customer On-Site

“A real customer (*) must sit with the team, available full-time to answer questions.”

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Le pratiche “di team”

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Sustainable Pace

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Sustainable Pace

• “In order to finish quickly, the team must run at a sustainable pace.”

• “A team is not allowed to work overtime"

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GitLab incident

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work long hour

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Collective Code Ownership

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Collective Code Ownership

• “Anyone can change any code anywhere in the system at any time.”

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Coding Standards

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Coding Standards

• Programmers write all code in accordance with rules emphasizing communication through the code.

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Pair Programming

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Pair Programming

• “All production code is written by pairs of programmers working on same workstation.”

https://it.wikipedia.org/wiki/File:Pair_programming_1.jpg Author: Lisamarie Babik

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Pair Programming

• Cosa succede quando non si fa pair?

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Continuous Integration

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Continuous Integration

Definizione:

• “Integrate and build the system many times a day, every time a task is completed.”

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Pratiche di design

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Metaphor

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Metaphor

• “Guide all development with a simple shared story of how the whole system works.”

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Test-Driven Development

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Test-Driven Development

Definizione:

• “Any program feature without an automated test simply doesn’t exists”

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Refactoringaka Incremental Design

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Refactoring

• Programmers restructure the system without changing its behavior to remove duplication, improve communication, simplify, or add flexibility.

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Refactoring?

• Ok ma a cosa serve?

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Simple Design

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Simple Design

Un pezzo di codice è semplice quando:

1. Fa passare tutti i test

2. Non contiene duplicazione

3. È chiaro ed esprime l’intento per cui è scritto

4. Non contiene parti superflue

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Per approfondire

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TDD Milanohttps://www.meetup.com/it-IT/TDD-Milano/

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GrazieAndrea Francia