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18 lines
570 B
Python
18 lines
570 B
Python
"""
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Concrete Observers react to the updates issued by the Subject they had been
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attached to.
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"""
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from behavioral.observer.observer import Observer
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from behavioral.observer.subject import Subject
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class ConcreteObserverA(Observer):
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def update(self, subject: Subject) -> None:
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if subject.state < 3:
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print("ConcreteObserverA: Reacted to the event")
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class ConcreteObserverB(Observer):
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def update(self, subject: Subject) -> None:
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if subject.state == 0 or subject.state >= 2:
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print("ConcreteObserverB: Reacted to the event")
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