敏捷软件开发读书笔记3

IV Planning Game from XP

Initial Exploration

Spiking ,Splitting,and Velocity

Release Plannning

Iteration Planning

Defining "Done"

Tast Planning

Iterating

Tracking

 

V Testing

Test-Driven Development

Test Isolation

Serendipitous Decoupling

Acceptance Tests

Serendipitous Architecture

 

VI Refactoring

Refactoring : the process of changing a software system in such a way that it does not alter the external behavior of the code yet improves its internal structure.

 

3 functions of software module

1. the function it performs while executing.

2. to afford change

3. to communicate to its readers.

 

3Steps

Unit testing

Refactoring

The final Reread

 

 

VI A programming Episode

 

 

Agile Design

Symptoms of poor design

Rigidity

Fragility

Immobility

Viscosity

Needless complexity

Needless repetition

Opacity

 

OO design priciples

SRP Single-Responsibility Principle

OCP Open/Closed Principle

LSP Liskov Substitution Principle

DIP Dependency-Inversion

ISP  Interface Segregation

 

The single-Respnsibility Principle
A class should have only one reason to change

Defining a Responsibility

Seperating Coupled Responsibilites
The Open/Closed Principle(OCP)
Software entities should be open for extension but closed for modification.
Anticipation and "Natural" Stucture
Putting the "Hooks" In
 Fool me once
 Stimulating change
Using Abstraction to Gain Explicit Closure
Using a Data-Driven Approach to Achieve Closure.

Liskove Substitution Principle
Subtypes must be substitutable for their base types