命令模式(python)

命令模式：将一个请求封装为一个对象，从而使你可用不同的请求对客户进行参数化；支持对请求排队、记录请求日志，以及可撤销的操作。

优点：把请求一个操作的对象与知道怎么执行一个操作的对象分隔开。

#encoding=utf-8
#
#by panda
#命令模式

def printInfo(info):
    print unicode(info, 'utf-8').encode('gbk')

import time
#Command
class Command():
    receiver = None
    def __init__(self, receiver):
        self.receiver = receiver
    
    def Execute(self):
        pass    

#具体命令类：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'
    
        
#具体命令类：拷鸡翅
class BakeChickenWingCommand(Command):
    def SetHandsetSoft(self, receiver):
        Command.__init__(self,receiver)
    
    def Execute(self):
        self.receiver.BakeChickenWing()   
    
    def ToString(self):
        return '拷鸡翅'
        
#Receiver：拷肉串的人
class Barbecuer():
    def BakeChickenWing(self):
        printInfo('拷鸡翅！')
    
    def BakeMutton(self):
        printInfo('拷羊肉串！')
        
#Invoker：服务员
class Waiter():
    commandList = []
    
    def SetOrder(self,command):
        printInfo('%s 增加订单：%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 取消订单：%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('运行手机通信录')

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()
    return

if __name__ == '__main__':
    clientUI();

类图：