hmchzb19's blog

复习下python的design_pattern Command_mediator_pattern

 
  • Feb 25, 2018

看了个韩国人做的Python Design Pattern视频，决定把以前的代码拿出来重新复习下.

  1. command Pattern

     #!/usr/bin/env python3
 # -*- coding: utf-8 -*-

 from abc import ABCMeta,abstractmethod

 class Order(metaclass=ABCMeta):
     @abstractmethod
     def execute(self):
         pass

 class BuyStockOrder(Order):
     def __init__(self,stock):
         self.stock=stock

     def execute(self):
         self.stock.buy()

 class SellStockOrder(Order):
     def __init__(self,stock):
         self.stock=stock

     def execute(self):
         self.stock.sell()

 class StockTrade:
     def buy(self):
         print("You will buy stocks")
        
     def sell(self):
         print("You will sell stocks")


 class Agent:
     def __init__(self):
         self.__orderQueue=[]

     def placeOrder(self,other):
         self.__orderQueue.append(other)
         other.execute()

 def test_agent():
     #client
     stock=StockTrade()
     buyStock=BuyStockOrder(stock)
     sellStock=SellStockOrder(stock)

     #Inovker
     agent=Agent()
     agent.placeOrder(buyStock)
     agent.placeOrder(sellStock)

 test_agent()

  2. Mediator pattern

     #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 # Author: hezhb
 # Created Time: Sat 24 Feb 2018 03:21:20 PM CST

 from abc import ABCMeta,abstractmethod
 import sys

 class Colleague(metaclass=ABCMeta):
        
     def __init__(self, mediator, id):
         self._mediator = mediator
         self._id = id
        
     def getId(self):
         return self._id
        
     @abstractmethod
     def send(self, msg):
         pass
        
     @abstractmethod
     def receive(self, msg):
         pass
            

 class ConcreteColleague(Colleague):
     def __init__(self, mediator, id):
         super().__init__(mediator, id)
        
     def send(self, msg):
         print("Message {} sent by Colleague {}".format(msg, self._id))
         self._mediator.distribute(self, msg)
        
     def receive(self, msg):
         print("Message {} received by Colleague {}".format(msg, self._id))
        

 class Mediator(metaclass=ABCMeta):
        
     @abstractmethod
     def add(self, colleague):
         pass
        
     @abstractmethod
     def distribute(self, sender, msg):
         pass
        

 class ConcreteMediator(Mediator):
     def __init__(self):
         Mediator.__init__(self)
         self._colleagues = []
        
     def add(self, colleague):
         self._colleagues.append(colleague)
            
     def distribute(self, sender, msg):
         for coll in self._colleagues:
             if coll.getId() != sender.getId():
                 coll.receive(msg)

 def main():
     mediator = ConcreteMediator()
        
     c1 = ConcreteColleague(mediator, 1)
     c2 = ConcreteColleague(mediator, 2)
     c3 = ConcreteColleague(mediator, 3)
        
     mediator.add(c1)
     mediator.add(c2)
     mediator.add(c3)
        
     c1.send("Good morning")
        
        
 if __name__=="__main__":
     main()

 #pyzo里面执行
 In [12]: %run -i /usr/local/src/py/design_pattern/mediator_pattern.py
 Message Good morning sent by Colleague 1
 Message Good morning received by Colleague 2
 Message Good morning received by Colleague 3
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