课程: Python: Design Patterns (2021)

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Observer

Observer - Python教程

课程: Python: Design Patterns (2021)

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Observer

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- [Narrator] The observer pattern establishes a one too many relationship between a subject and multiple observers. Our problem here is that a subject needs to be monitored and other observer objects should be notified when there is a change in the subject. In our scenario, we keep track of the core temperatures of reactors at a power plant. When there is a change in the core temperature, registered observers must be notified. Our solution uses an abstract class called subject, which has the interface that allows operations such as attaching, detaching, and notifying observers. We also need concrete subject classes inheriting from the abstract subject class. Singleton is related to the observer design pattern.

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