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https://github.com/rjNemo/design-patterns
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* doc: create package & update general TOCs * doc: add documentation * add code example * reformat using black
35 lines
714 B
Python
35 lines
714 B
Python
from abc import ABC, abstractmethod
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from behavioral.observer.observer import Observer
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class Subject(ABC):
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"""
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The Subject interface declares a set of methods for managing subscribers.
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"""
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@property
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@abstractmethod
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def state(self) -> int:
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pass
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@abstractmethod
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def attach(self, observer: Observer) -> None:
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"""
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Attach an observer to the subject.
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"""
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pass
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@abstractmethod
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def detach(self, observer: Observer) -> None:
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"""
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Detach an observer to the subject.
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"""
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pass
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@abstractmethod
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def notify(self) -> None:
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"""
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Notify all observers about an event.
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"""
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pass
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