Question: The Observer Design Pattern 1. The Observer pattern is an alternative to polling. What is polling and what are the drawbacks? 2. The observer pattern

The Observer Design Pattern

1. The Observer pattern is an alternative to polling. What is polling and what are the drawbacks?

2. The observer pattern uses notifications in two different ways: push notifications and pull notifications. What is a push notification? When would you use this kind of notification?

3. The observer pattern uses notifications in two different ways: push notifications and pull notifications. What is a pull notification? When would you use this kind of notification?

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