It's time to practice incorporating the observer pattern into a design. Practice the observer pattern on a simple weather station design in this video.
(high energy music) … - [Narrator] The observer pattern can be used … to loosely couple objects together. … Whenever you have objects that want to be notified … when another object is updated. … In this challenge, you'll design a weather station … and various classes that are interested … in the weather station's data. … Including a user interface, a logger, and an alert system. … The weather station has a set of sensors that are used … to measure temperature, wind speed, and pressure. … The user interface, logger, and alert system … are all interested in the data, and want to be notified … when the weather station gets new data from the sensors. … Make sure your design allows for other observers … to easily be added to the design. … For instance, you might want your business to get notified … by the weather station too, and you don't want … to have to change the code in the weather station. … …
- 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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