What are the applicable scenarios for the observer pattern?
Applicable scenarios for the observer pattern include: 1. When an abstract model has two aspects, one of which depends on the other; 2. When changes to one object require changes to other objects at the same time, without Know how many objects need to be changed; 3. When an object must notify other objects, it cannot assume who the other objects are.
Observer Pattern
Defines a one-to-many dependency relationship between objects. When an object's state changes, all objects that depend on it are notified and automatically updated
Applicability
When an abstract The model has two aspects, one of which depends on the other. Encapsulate the two in independent objects so that they can be changed and reused independently
When changes to one object require changes to other objects at the same time, and you do not know the specific How many objects are left to change
When an object must notify other objects, but it cannot assume who the other objects are. In other words, you don’t know that these objects are tightly coupled
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