责任链模式是一种行为型设计模式

type department interface {

execute(*patient)

setNext(department)

}

medical.go

import "fmt"

type medical struct {

next department

}

func (m *medical) execute(p *patient) {

if p.medicineDone {

fmt.Println("Medicine already given to patient")

m.next.execute(p)

return

}

fmt.Println("Medical giving medicine to patient")

p.medicineDone = true

m.next.execute(p)

}

func (m *medical) setNext(next department) {

m.next = next

}

cashier.go

import "fmt"

type cashier struct {

next department

}

func (c *cashier) execute(p *patient) {

if p.paymentDone {

fmt.Println("Payment Done")

}

fmt.Println("Cashier getting money from patient patient")

c.next.execute(p)

}

func (c *cashier) setNext(next department) {

c.next = next

}

doctor.go

import "fmt"

type doctor struct {

next department

}

func (d *doctor) execute(p *patient) {

if p.doctorCheckUpDone {

fmt.Println("Doctor checkup already done")

d.next.execute(p)

return

}

fmt.Println("Doctor checking patient")

p.doctorCheckUpDone = true

d.next.execute(p)

}

func (d *doctor) setNext(next department) {

d.next = next

}

reception.go

import "fmt"

type reception struct {

next department

}

func (r *reception) execute(p *patient) {

if p.registrationDone {

fmt.Println("Patient registration already done")

r.next.execute(p)

return

}

fmt.Println("Reception registering patient")

p.registrationDone = true

r.next.execute(p)

}

func (r *reception) setNext(next department) {

r.next = next

}

patient.go

type patient struct {

name string

registrationDone bool

doctorCheckUpDone bool

medicineDone bool

paymentDone bool

}

　　main.go

func main() {

medical := &medical{}

//Set next for cashier department

cashier := &cashier{}

cashier.setNext(medical)

//Set next for doctor department

doctor := &doctor{}

doctor.setNext(cashier)

//Set next for reception department

reception := &reception{}

reception.setNext(doctor)

patient := &patient{name: "abc"}

//Patient visiting

reception.execute(patient)

}

执行结果如下：

Reception registering patient

Doctor checking patient

Cashier getting money from patient patient

Medical giving medicine to patient