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mediatorpattern.py
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mediatorpattern.py
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from abc import ABC, abstractmethod
class Colleague(ABC):
@abstractmethod
def place_bid(self, bid_amount):
pass
def receive_bid_notification(self, bid_amount):
pass
def get_name(self):
pass
class Bidder(Colleague):
def __init__(self, name, auction_mediator):
self.name = name
self.auction_mediator = auction_mediator
self.auction_mediator.add_bidder(self)
def place_bid(self, bid_amount):
self.auction_mediator.place_bid(self, bid_amount)
def receive_bid_notification(self, bid_amount):
print('Bidder:', self.name, 'got notification that someone has put a bid of:', bid_amount)
def get_name(self):
return self.name
# this is a mediator interface
class AuctionMediator(ABC):
@abstractmethod
def add_bidder(self, bidder):
pass
@abstractmethod
def place_bid(self, bidder, bid_amount):
pass
class Auction(AuctionMediator):
def __init__(self):
self.colleagues = []
def add_bidder(self, bidder):
self.colleagues.append(bidder)
def place_bid(self, bidder, bid_amount):
for colleague in self.colleagues:
if colleague.get_name() != bidder.get_name():
colleague.receive_bid_notification(bid_amount)
if __name__ == '__main__':
auction_mediator_obj = Auction()
bidder_1 = Bidder('A', auction_mediator_obj)
bidder_2 = Bidder('B', auction_mediator_obj)
bidder_1.place_bid(2000)
bidder_2.place_bid(3000)
bidder_1.place_bid(3001)