33 lines
1.3 KiB
Python
33 lines
1.3 KiB
Python
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from abc import ABC, abstractmethod
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class Handler(ABC):
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def __init__(self, successor=None): self.successor = successor # Следующий обработчик в цепи
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@abstractmethod
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def handle_request(self, request): pass
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class ConcreteHandlerA(Handler):
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def handle_request(self, request):
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if request == "A":
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return f"Handler A handled the request: {request}"
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elif self.successor:
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return self.successor.handle_request(request)
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return "Request not handled"
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class ConcreteHandlerB(Handler):
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def handle_request(self, request):
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if request == "B":
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return f"Handler B handled the request: {request}"
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elif self.successor:
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return self.successor.handle_request(request)
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return "Request not handled"
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class ConcreteHandlerC(Handler):
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def handle_request(self, request):
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if request == "C": return f"Handler C handled the request: {request}"
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elif self.successor: return self.successor.handle_request(request)
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return "Request not handled"
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handler_chain = ConcreteHandlerA(ConcreteHandlerB(ConcreteHandlerC())) # Цепочка обработчиков
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requests = ["A", "B", "C", "D"] # Примеры запросов
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for req in requests: print(handler_chain.handle_request(req))
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