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16 lines
337 B
Python
16 lines
337 B
Python
from abc import ABC, abstractmethod
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from structural.proxy.subject import Subject
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class Observer(ABC):
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"""
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The Observer interface declares the update method, used by subjects.
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"""
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@abstractmethod
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def update(self, subject: Subject) -> None:
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"""
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Receive update from subject.
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"""
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pass
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