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IT/ETC

Chapter 2

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Observer pattern can be visualized as newspaper subscription service with its publishers and subscribers.

 

the subject is the publisher, observers are the subscribers.

 

The observer pattern - defines a one-to-many dependency between objects so that when one object changes state, all of its dependents are notified and updated automatically. 

 

Design principles : Strive for loosely coupled designs between objects that interact

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