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命令模式

模式说明

将请求封装成对象,从而使可用不同的请求对客户进行参数化;对请求排队或记录请求日志,以及支持可撤消的操作。

模式结构图

程序示例

说明:调用者是遥控器,接受者是电视

代码:

class TV(object):    def open(self):        print turn on tv    def close(self):        print turn off tv    def changeChannel(self):        print change channelclass Command(object):    _tv = TV()    def __init__(self,tv):        self._tv = tv    def execute(self):        passclass TurnOnCommand(Command):    def execute(self):        self._tv.open()class TurnOffCommand(Command):    def execute(self):        self._tv.close()class ChangeChannelCommand(Command):    def execute(self):        self._tv.changeChannel()class Controller(object):    #_turnon = None    #_turnoff = None    #_changechannel = None    def __init__(self,turnon,turnoff,changechannel):        self._changechannel = changechannel        self._turnon = turnon        self._turnoff = turnoff    def open(self):        self._turnon.execute()    def close(self):        self._turnoff.execute()    def changechannel(self):        self._changechannel.execute()if __main__ == __name__:    tv = TV()    turnon = TurnOnCommand(tv)    turnoff = TurnOffCommand(tv)    changechannel = ChangeChannelCommand(tv)    controller = Controller(turnon,turnoff,changechannel)    controller.open()    controller.changechannel()    controller.close()

运行结果:

参考来源:

http://www.cnblogs.com/chenssy/p/3679190.html

http://www.cnblogs.com/wuyuegb2312/archive/2013/04/09/3008320.html

http://www.cnblogs.com/Terrylee/archive/2006/07/17/334911.html

 

命令模式