Golang设计模式之责任链模式讲解和代码示例

package main
type Department interface {
	execute(*Patient)
	setNext(Department)
}

package main
import "fmt"
// 前台
type Reception struct {
	next Department
}
func (r *Reception) execute(p *Patient) {
	if p.registrationDone {
		fmt.Println("Patient registration already done")
		r.next.execute(p)
	}
	fmt.Println("Reception registering patient")
	p.registrationDone = true
	r.next.execute(p)
}
func (r *Reception) setNext(next Department) {
	r.next = next
}

package main
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
}

package main
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
}

package main
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")
}
func (c *Cashier) setNext(next Department) {
	c.next = next
}

package main
type Patient struct {
	name              string
	registrationDone  bool // 注册状态
	doctorCheckUpDone bool // 医生是否检查完成
	medicineDone      bool // 是否取完了药品
	paymentDone       bool // 是否已经支付
}

package main
func main() {
	cashier := &Cashier{}
	// set next for medical department
	medical := &Medical{}
	medical.setNext(cashier)
	//Set next for doctor department
	doctor := &Doctor{}
	doctor.setNext(medical)
	//Set next for reception department
	reception := &Reception{}
	reception.setNext(doctor)
	patient := &Patient{name: "abc"}
	//Patient visiting
	reception.execute(patient)
}