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开闭原则

软件实体应该对扩展开放，对修改关闭。一个软件实体应该通过扩展来实现变化，而不是通过修改已有的代码来实现变化。

多扩展开放，修改关闭

• 逻辑变化
• 子模块变化
• 可见视图变化

为什么用开闭原则

• 开闭原则对测试的影响

保证不产生有毒代码（Poisonous Code）

• 开闭原则可以提高复用性

• 开闭原则可以提高可维护性

• 面向对象开发的要求

如何使用开闭原则

1.抽象约束

• 不出现接口不存在的public func
• 尽量使用接口，go中虽然没有继承，但是可以用组合
• 抽象层尽量稳定

2.元数据控制模块行为 3.制定项目章程 4.封装变化

Documentation

Index

• func PrintBook()
• func PrintMixBook()
• func PrintOffBook()
• type Book
• type BookStore
• type ComputerBook
  • func NewComputerBook(name, author, scope string, price int) *ComputerBook
• type IBook
• type IComputerBook
• type NovelBook
  • func NewNovelBook(name, author string, price int) *NovelBook
• type OffNovelBook
  • func NewOffNovelBook(name, author string, price int) *OffNovelBook

Functions

func PrintBook

func PrintBook()

func PrintMixBook

func PrintMixBook()

func PrintOffBook

func PrintOffBook()

Types

type Book

type Book struct {
}

type BookStore

type BookStore struct {
	// contains filtered or unexported fields
}

type ComputerBook

type ComputerBook struct {
	// contains filtered or unexported fields
}

func NewComputerBook

func NewComputerBook(name, author, scope string, price int) *ComputerBook

type IBook

type IBook interface {
	// contains filtered or unexported methods
}

type IComputerBook

type IComputerBook interface {
	IBook
	// contains filtered or unexported methods
}

type NovelBook

type NovelBook struct {
	// contains filtered or unexported fields
}

func NewNovelBook

func NewNovelBook(name, author string, price int) *NovelBook

type OffNovelBook

type OffNovelBook struct {
	// contains filtered or unexported fields
}

func NewOffNovelBook

func NewOffNovelBook(name, author string, price int) *OffNovelBook