苏州培训网站建设,怎么恢复wordpress设定值,医院网站建设方案大全,清河网站建设电话golang 架构设计原则 依赖倒置原则缘起最近复习设计模式拜读谭勇德的该书以java语言演绎了常见设计模式本系列笔记拟采用golang练习之依赖倒置原则依赖倒置原则(Dependence Inversion Principle, DIP)指设计代码结构时#xff0c;高层模块不应该依赖底层模块#xff…golang 架构设计原则 依赖倒置原则缘起最近复习设计模式拜读谭勇德的该书以java语言演绎了常见设计模式本系列笔记拟采用golang练习之依赖倒置原则依赖倒置原则(Dependence Inversion Principle, DIP)指设计代码结构时高层模块不应该依赖底层模块二者都应该依赖其抽象。抽象不应该依赖细节细节应该依赖抽象。常见的依赖注入方式有: 方法参数注入, 构造器参数注入, setter方法注入_场景线上学校有一系列课程用户可选择若干门课程进行学习如果把学习课程的过程直接实现为用户的方法, 则每增加一门课程, 就需要增加一个学习方法根据依赖倒置原则, 可以把学习过程抽象为学习接口, 由不同的课程实例各自实现BadUser.goBadUser以不同方法实现各种课程的学习过程, 课程的增加导致BadUser代码越来越臃肿package dependence_inversionimport fmttype BadUser struct {iID intsName string}func NewBadUser(id int, name string) *BadUser {return BadUser{iID: id,sName: name,}}func (me *BadUser) StudyJavaCourse() {fmt.Printf(%v is learning %v\n, me.sName, java)}func (me *BadUser) StudyGolangCourse() {fmt.Printf(%v is learning %v\n, me.sName, golang)}GoodUser.goGoodUser通过实现IUser接口提供用户基本信息, 并把不同课程的学习过程, 委托给ICourse接口去实现package dependence_inversiontype IUser interface {ID() intName() stringStudy(ICourse)}type GoodUser struct {iID intsName string}func NewGoodUser(id int, name string) IUser {return GoodUser{iID: id,sName: name,}}func (me *GoodUser) ID() int {return me.iID}func (me *GoodUser) Name() string {return me.sName}func (me *GoodUser) Study(course ICourse) {course.SetUser(me)course.Study()}GolangCourse.go通过setter方法注入IUser, ICourse接口封装了具体课程的学习过程package dependence_inversionimport fmttype ICourse interface {ID() intName() stringSetUser(IUser)Study()}type GolangCourse struct {iID intsName stringxCurrentUser IUser}func NewGolangCourse() ICourse {return GolangCourse{iID: 11,sName: golang,xCurrentUser: nil,}}func (me *GolangCourse) ID() int {return me.iID}func (me *GolangCourse) Name() string {return me.sName}func (me *GolangCourse) SetUser(user IUser) {me.xCurrentUser user}func (me *GolangCourse) Study() {fmt.Printf(%v is learning %v\n, me.xCurrentUser.Name(), me.Name())}dependence_inversion_test.go测试用例package mainimport testingimport (dip learning/gooop/principles/dependence_inversion)func TestDIP(t *testing.T) {bu : dip.NewBadUser(1, Tom)bu.StudyGolangCourse()gu : dip.NewGoodUser(2, Mike)gu.Study(dip.NewGolangCourse())}测试输出$ go test -v main/dependence_inversion_test.go RUN TestDIPTom is learning golangMike is learning golang--- PASS: TestDIP (0.00s)PASSok command-line-arguments 0.002s有疑问加站长微信联系(非本文作者)
