138 lines
2.9 KiB
Go
138 lines
2.9 KiB
Go
package main
|
|
|
|
import "fmt"
|
|
|
|
/*
|
|
实例：
|
|
汤宝宝成为一国之王，手下有一个传令官和三个大臣，分别是内政大臣、外交大臣和军事大臣。
|
|
有一天，汤宝宝想要发布一个命令，传令官负责将命令传达给大臣们，大臣们根据命令的内容决定是否执行。
|
|
*/
|
|
|
|
// 接收者接口
|
|
type Receiver interface {
|
|
perform()
|
|
abort()
|
|
}
|
|
|
|
// 内政大臣
|
|
type HomeSecretary struct {
|
|
isPerforming bool
|
|
}
|
|
|
|
func (h *HomeSecretary) perform() {
|
|
h.isPerforming = true
|
|
fmt.Println("内政大臣开始执行命令")
|
|
}
|
|
|
|
func (h *HomeSecretary) abort() {
|
|
h.isPerforming = false
|
|
fmt.Println("内政大臣取消执行命令")
|
|
}
|
|
|
|
// 外交大臣
|
|
type ForeignSecretary struct {
|
|
isPerforming bool
|
|
}
|
|
|
|
func (f *ForeignSecretary) perform() {
|
|
f.isPerforming = true
|
|
fmt.Println("外交大臣开始执行命令")
|
|
}
|
|
|
|
func (f *ForeignSecretary) abort() {
|
|
f.isPerforming = false
|
|
fmt.Println("外交大臣取消执行命令")
|
|
}
|
|
|
|
// 军事大臣
|
|
type DefenseSecretary struct {
|
|
isPerforming bool
|
|
}
|
|
|
|
func (d *DefenseSecretary) perform() {
|
|
d.isPerforming = true
|
|
fmt.Println("军事大臣开始执行命令")
|
|
}
|
|
|
|
func (d *DefenseSecretary) abort() {
|
|
d.isPerforming = false
|
|
fmt.Println("军事大臣取消执行命令")
|
|
}
|
|
|
|
// 命令接口
|
|
type Command interface {
|
|
execute()
|
|
}
|
|
|
|
// 执行命令
|
|
type PerformCommand struct {
|
|
receiver Receiver
|
|
}
|
|
|
|
func (c *PerformCommand) execute() {
|
|
c.receiver.perform()
|
|
}
|
|
|
|
// 取消命令
|
|
type AbortCommand struct {
|
|
receiver Receiver
|
|
}
|
|
|
|
func (c *AbortCommand) execute() {
|
|
c.receiver.abort()
|
|
}
|
|
|
|
// Invoker - 传令官
|
|
type Herald struct {
|
|
commands []Command
|
|
}
|
|
|
|
func (h *Herald) addCommand(command Command) {
|
|
h.commands = append(h.commands, command)
|
|
}
|
|
|
|
func (h *Herald) executeCommands() {
|
|
for _, command := range h.commands {
|
|
command.execute()
|
|
}
|
|
h.commands = []Command{} // 清空命令列表
|
|
}
|
|
|
|
func main() {
|
|
fmt.Println("========= 命令模式 =========")
|
|
// 创建接收者
|
|
homeSecretary := &HomeSecretary{}
|
|
foreignSecretary := &ForeignSecretary{}
|
|
defenseSecretary := &DefenseSecretary{}
|
|
|
|
// 创建命令
|
|
performHomeCommand := &PerformCommand{receiver: homeSecretary}
|
|
abortHomeCommand := &AbortCommand{receiver: homeSecretary}
|
|
performForeignCommand := &PerformCommand{receiver: foreignSecretary}
|
|
abortForeignCommand := &AbortCommand{receiver: foreignSecretary}
|
|
performDefenseCommand := &PerformCommand{receiver: defenseSecretary}
|
|
abortDefenseCommand := &AbortCommand{receiver: defenseSecretary}
|
|
|
|
// 创建传令官
|
|
herald := &Herald{}
|
|
|
|
// 添加命令
|
|
herald.addCommand(performHomeCommand)
|
|
herald.addCommand(performForeignCommand)
|
|
herald.addCommand(performDefenseCommand)
|
|
|
|
// 执行命令
|
|
herald.executeCommands()
|
|
|
|
// 取消命令
|
|
herald.addCommand(abortHomeCommand)
|
|
herald.addCommand(abortForeignCommand)
|
|
herald.addCommand(abortDefenseCommand)
|
|
|
|
// 执行取消命令
|
|
herald.executeCommands()
|
|
|
|
fmt.Println()
|
|
fmt.Println("======= 命令模式结束 =======")
|
|
}
|