命令模式(python)

命令模式：將一個請求封裝為一個對象，從而使你可用不同的請求對客戶進行參數化；支援對請求排隊、記錄請求日誌，以及可撤銷的操作。

優點：把請求一個操作的對象與知道怎麼執行一個操作的對象分隔開。

#encoding=utf-8##by panda#命令模式def printInfo(info):    print unicode(info, 'utf-8').encode('gbk')import time#Commandclass Command():    receiver = None    def __init__(self, receiver):        self.receiver = receiver        def Execute(self):        pass    #具體命令類：拷羊肉串class BakeMuttonCommand(Command):    def SetHandsetSoft(self, receiver):        Command.__init__(self,receiver)        def Execute(self):        self.receiver.BakeMutton()               def ToString(self):        return '拷羊肉串'            #具體命令類：拷雞翅class BakeChickenWingCommand(Command):    def SetHandsetSoft(self, receiver):        Command.__init__(self,receiver)        def Execute(self):        self.receiver.BakeChickenWing()           def ToString(self):        return '拷雞翅'        #Receiver：拷肉串的人class Barbecuer():    def BakeChickenWing(self):        printInfo('拷雞翅！')        def BakeMutton(self):        printInfo('拷羊肉串！')        #Invoker：服務員class Waiter():    commandList = []        def SetOrder(self,command):        printInfo('%s 增加訂單：%s' % (time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(time.time())),command.ToString()))        self.commandList.append(command)        def CancelOrder(self,command):        printInfo('%s 取消訂單：%s' % (time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(time.time())),command.ToString()))        self.commandList.remove(command)        def Notify(self):        printInfo('\n通知：')        for command in self.commandList:            command.Execute()    def Run(self):        printInfo('運行手機通訊錄')def clientUI():    boy = Barbecuer()    bakeMuttonCommand1 = BakeMuttonCommand(boy)    bakeMuttonCommand2 = BakeMuttonCommand(boy)    bakeChickenWingCommand1 = BakeChickenWingCommand(boy)    girl = Waiter()        girl.SetOrder(bakeMuttonCommand1)    girl.SetOrder(bakeMuttonCommand2)    girl.SetOrder(bakeChickenWingCommand1)    girl.CancelOrder(bakeMuttonCommand1)    girl.Notify()    returnif __name__ == '__main__':    clientUI();

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