ITEC 370

Lecture 16Implementation

Implementation

Review

• Questions?• Design document on F, feedback

tomorrow• Midterm on F• Implementation–Management (MMM)– Team roles– Code reviews / Pair programming

Implementation

Objectives

• Look at version control

Implementation

Scenario

• You spend 4 hours working on a feature

• Another teammate also spends 4 hours working on a feature

• Both work• Both include changes to the same

system• Which code should be accepted?

Implementation

Issues

• What files are part of the repository• Who can modify each file• How are conflicts (merges) handled• Who can add files to the repository• Who can remove files from the

repository• Are all changes logged so reversion

is possible

Implementation

Updating

• When you change the repository you can leave a message

• Extremely useful in maintenance• Also useful for keeping track of

developers

Implementation

Bad version control

• Fruit can / USB key• Issues– Backup?– Source hog

Implementation

Types

• Simple– Only one person can write at a time

• Centralized– One server to rule them all

• Distributed– Spread out all over the place

Implementation

Access

• GUI– Integrated into IDE

• Non-GUI– Command line app– Type in commands to handle it

(preferred method)

Implementation

Git

• Free for open source, low cost for private repositories

• Distributed system– Local / remote repository

• Supports branching and merging– Good for experiments– Takes extra effort

Implementation

Visually

Initial Prototype 1

Prototype 2

Alpha 1

Implementation

Starting a repository in Git

• First off create content• Second, store content in a directory• Commands– git init– git add .– git commit –m “Initial commit”

Implementation

Updating

• Use git diff to see what is different between working copy and repository

• Use git commit –a to add local changes to repository

• Warning: Have to add new files manually– git –A .

• Fun– git blame filename

Implementation

Remote repository

• Want to get code from someone?– git remote add origin

git@github.com:vogella/gitbook.git– Switch to a different directory– git clone --bare . path/gitbook.git

• Want to send code to someone?– git push –u name master

Implementation

Guide

• Excellent tutorial

• Branching / merging• Specifics / examples

http://www.vogella.com/articles/Git/article.html

Implementation

Review

• Version control–Why–What is typically used– Example of Git