Advanced-Assignments

Building a Weather Monitoring System

To Build a Weather Monitoring System I implemented the Observer design pattern with the addition of decorator pattern to extend the behavior of observers.

In the Observer design pattern identifying the weather_subject interface watch is defined the method add, remove notify Observers, identifying weather_subject that implements the subject interface that notify the observers, identifying weather_observer interface that implemented by current_conditions & statistics that need notify of change weather state.

In the decorator pattern identifying the weather_decortor that is base for decorators classes , that implements the weather_observer interface, the temperature_units,wind_spee, precipitation extend, and the adding the additional responsibilities to display additional information

And that achieves design principles :

• Single Responsibility Principle: Thet achieved in the weather_subject, current_conditions, statistics classes have a single clear purpose.
• Open/Closed Principle: Thet achieved in the weather_observer interface and its implementations are closed for modification but open for extension via decorators.
• Interface Segregation Principle: Thet achieved in the iweather_subject, weather_observer contain specifically what's needed.
• Dependency Inversion: Thet achieved in the High-level weather_subject depends on abstraction weather_observer. This decouples the design.

class diagram