设计模式 chain 实现
golang 设计模式 chain 代码实现
package chain
import "fmt"
type Manager interface {
HaveRight(money int) bool
HandleFeeRequest(name string, money int) bool
}
type RequestChain struct {
Manager
successor *RequestChain
}
func (r *RequestChain) SetSuccessor(m *RequestChain) {
r.successor = m
}
func (r *RequestChain) HandleFeeRequest(name string, money int) bool {
if r.Manager.HaveRight(money) {
return r.Manager.HandleFeeRequest(name, money)
}
if r.successor != nil {
return r.successor.HandleFeeRequest(name, money)
}
return false
}
func (r *RequestChain) HaveRight(money int) bool {
return true
}
type ProjectManager struct{}
func NewProjectManagerChain() *RequestChain {
return &RequestChain{
Manager: &ProjectManager{},
}
}
func (*ProjectManager) HaveRight(money int) bool {
return money < 500
}
func (*ProjectManager) HandleFeeRequest(name string, money int) bool {
if name == "bob" {
fmt.Printf("Project manager permit %s %d fee request\n", name, money)
return true
}
fmt.Printf("Project manager don't permit %s %d fee request\n", name, money)
return false
}
type DepManager struct{}
func NewDepManagerChain() *RequestChain {
return &RequestChain{
Manager: &DepManager{},
}
}
func (*DepManager) HaveRight(money int) bool {
return money < 5000
}
func (*DepManager) HandleFeeRequest(name string, money int) bool {
if name == "tom" {
fmt.Printf("Dep manager permit %s %d fee request\n", name, money)
return true
}
fmt.Printf("Dep manager don't permit %s %d fee request\n", name, money)
return false
}
type GeneralManager struct{}
func NewGeneralManagerChain() *RequestChain {
return &RequestChain{
Manager: &GeneralManager{},
}
}
func (*GeneralManager) HaveRight(money int) bool {
return true
}
func (*GeneralManager) HandleFeeRequest(name string, money int) bool {
if name == "ada" {
fmt.Printf("General manager permit %s %d fee request\n", name, money)
return true
}
fmt.Printf("General manager don't permit %s %d fee request\n", name, money)
return false
}
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