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120 lines
2.7 KiB
Go
120 lines
2.7 KiB
Go
/**
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* @Author:zhoutao
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* @Date:2020/12/12 下午3:46
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* @Desc:
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*/
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package chain
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import "fmt"
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//责任链模式：用于分离不同职责，并且动态组合相关职责
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//golang因为没有继承的支持，在实现责任链的时候，使用链对象 涵盖 职责的方式，
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//即：
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//1、链对象包含当前职责对象以及下一个职责链
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//2、职责对象提供接口表示 是否能处理对应请求
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//3、职责对象提供处理函数的相关职责
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// 同时在职责链类中实现职责接口相关函数，使职责链对象可以当做一般职责对象使用
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type Manager interface {
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HaveRight(money int) bool
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HandleFeeRequest(name string, money int) bool
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}
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//
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type RequestChain struct {
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Manager
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successor *RequestChain
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}
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//connected r Chain with m Chain
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func (r *RequestChain) SetSuccessor(m *RequestChain) {
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r.successor = m
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}
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func (r *RequestChain) HandleFeeRequest(name string, money int) bool {
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if r.Manager.HaveRight(money) {
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return r.Manager.HandleFeeRequest(name, money)
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}
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if r.successor != nil {
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return r.successor.HandleFeeRequest(name, money)
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}
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return false
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}
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func (r *RequestChain) HaveRight(money int) bool {
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return true
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}
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//new chain by projectManager
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//职责：ProjectManager
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func NewProjectManagerChain() *RequestChain {
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return &RequestChain{
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Manager: &ProjectManager{},
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}
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}
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type ProjectManager struct {
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}
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func (p *ProjectManager) HaveRight(money int) bool {
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return money < 50
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}
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func (p *ProjectManager) HandleFeeRequest(name string, money int) bool {
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if name == "bob" {
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fmt.Printf("Project manager permit %s %d fee request\n", name, money)
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return true
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}
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fmt.Printf("Project manager do not permit %s fee request\n", name, money)
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return false
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}
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//new chain by DepManager
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//职责：DepManager
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func NewDepManagerChain() *RequestChain {
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return &RequestChain{
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Manager: &DepManager{},
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}
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}
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type DepManager struct {
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}
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func (d *DepManager) HaveRight(money int) bool {
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return money < 5000
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}
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func (d *DepManager) HandleFeeRequest(name string, money int) bool {
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if name == "bob" {
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fmt.Printf("dep manager permit %s %d fee request\n", name, money)
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return true
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}
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fmt.Printf("dep manager do not permit %s fee request\n", name, money)
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return false
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}
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//new chain by GeneralManager
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//职责：GeneralManager
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func NewGeneralManagerChain() *RequestChain {
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return &RequestChain{
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Manager: &GeneralManager{},
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}
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}
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type GeneralManager struct {
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}
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func (g *GeneralManager) HaveRight(money int) bool {
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return true
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}
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func (g *GeneralManager) HandleFeeRequest(name string, money int) bool {
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if name == "bob" {
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fmt.Printf("general manager permit %s %d fee request\n", name, money)
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return true
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}
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fmt.Printf("general manager do not permit %s fee request\n", name, money)
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return false
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}
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