How does loose coupling relate to the observer pattern? This video shows how to couple objects, but not too tightly.
- [Instructor] Let's talk about how the observable pattern … helps make our design loosely coupled. … We can say that the subjects and observers … are loosely coupled because, while they interact, … which makes them coupled, they really don't know a lot … about each other, which makes them loosely coupled. … If you look at the subject, the subject knows … only that the observer implements a certain interface. … It doesn't need to know the concrete class of the observer. … In fact, any class can implement the observable interface … and effectively subscribe to the subject. … So what about the observer? … Well, the subject doesn't know any details … of the observer. … All the subject knows is that it has a list of objects … that implement the observable interface. … And it uses that list to notify those observers … when something changes. … The observers are free to add themselves to the list … at any time, they can also remove themselves, … or even be replaced by another observer at any time. …
- What are design patterns?
- Encapsulating code that varies with the Strategy pattern
- The limitations of inheritance
- Using the Adapter pattern
- Implementing the Observer pattern
- Extending behavior with composition and the Decorator pattern
- Encapsulating iteration with the Iterator pattern
- Object creation with the Factory Method pattern
- Using design principles to guide your object-oriented design
Skill Level Intermediate
1. Design Patterns
2. The Strategy Pattern
3. The Adapter Pattern
4. The Observer Pattern
Using the Observer pattern2m 23s
5. The Decorator Pattern
6. The Iterator Pattern
7. The Factory Patterns
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