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behavior/06_chain_of_responsibility/README.md
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15
behavior/06_chain_of_responsibility/README.md
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# 职责链模式
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职责链模式用于动态组合一些行为,在go实现相对更为简单,行为模式中提到的option模式跟此模式很像,但是两者场景用例不同,op模式的行为常常用于对象初始化或者某一过程中设置参数,职责链主要作用在于动态组合行为链,以便处理特定的对象或者问题。
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中间件模式就是一个典型的职责链模式,一个对象,在中间件中层层传递,每一层都可以进行自己的处理。
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Golang实现职责链模式时候,因为没有继承的支持,使用链对象包涵职责的方式,即:
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* 链对象包含当前职责对象以及下一个职责链。
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* 职责对象提供接口表示是否能处理对应请求。
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* 职责对象提供处理函数处理相关职责。
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同时可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是用。
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behavior/06_chain_of_responsibility/responsibility_chain.go
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behavior/06_chain_of_responsibility/responsibility_chain.go
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package chain
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import "fmt"
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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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type RequestChain struct {
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Manager
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successor *RequestChain
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}
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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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type ProjectManager struct{}
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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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func (*ProjectManager) HaveRight(money int) bool {
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return money < 500
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}
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func (*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 don't permit %s %d fee request\n", name, money)
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return false
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}
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type DepManager struct{}
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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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func (*DepManager) HaveRight(money int) bool {
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return money < 5000
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}
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func (*DepManager) HandleFeeRequest(name string, money int) bool {
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if name == "tom" {
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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 don't permit %s %d fee request\n", name, money)
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return false
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}
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type GeneralManager struct{}
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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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func (*GeneralManager) HaveRight(money int) bool {
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return true
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}
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func (*GeneralManager) HandleFeeRequest(name string, money int) bool {
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if name == "ada" {
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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 don't permit %s %d fee request\n", name, money)
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return false
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}
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package chain
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func ExampleChain() {
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c1 := NewProjectManagerChain()
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c2 := NewDepManagerChain()
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c3 := NewGeneralManagerChain()
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c1.SetSuccessor(c2)
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c2.SetSuccessor(c3)
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var c Manager = c1
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c.HandleFeeRequest("bob", 400)
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c.HandleFeeRequest("tom", 1400)
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c.HandleFeeRequest("ada", 10000)
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c.HandleFeeRequest("floar", 400)
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// Output:
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// Project manager permit bob 400 fee request
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// Dep manager permit tom 1400 fee request
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// General manager permit ada 10000 fee request
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// Project manager don't permit floar 400 fee request
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}
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