Observer Designer

This repository contains implementations of the Observer design pattern in various programming languages. The Observer pattern defines a one-to-many dependency between objects so that when one object changes state, all its dependents are notified and updated automatically.

Java Implementation

ObserverDesign Package

Channel Class

• Represents a channel that subscribers can subscribe to.
• Methods:
  • Subscribe(Subscriber sub): Subscribes a subscriber to the channel.
  • UnSubscribe(Subscriber sub): Unsubscribes a subscriber from the channel.
  • NotifySubscriber(): Notifies all subscribers when an upload occurs.
  • Upload(String title): Uploads a new video with the given title.

Subscriber Interface

• Represents an observer that can subscribe to channels.
• Methods:
  • Update(): Method to be implemented by concrete subscribers to update them about changes.
  • SubscribeChannel(Channel ch): Subscribes the observer to a specific channel.

Main Class

• Contains the main method for testing the Observer pattern implementation.

C++ Implementation

ObserverDesign Namespace

IObserver Class

• Abstract class representing an observer.
• Methods:
  • Update(): Virtual method to be overridden by concrete observers.

Channel Class

• Represents a channel that observers can subscribe to.
• Methods:
  • Subscribe(IObserver* observer): Subscribes an observer to the channel.
  • UnSubscribe(IObserver* observer): Unsubscribes an observer from the channel.
  • NotifyObservers(): Notifies all subscribed observers.
  • Upload(std::string title): Uploads a new video with the given title.

Subscriber Class

• Represents a subscriber that observes a channel.
• Methods:
  • Update(): Updates the subscriber about changes in the channel.

Main Function

• Contains the main function for testing the C++ Observer pattern implementation.

C# Implementation

ObserverDesign Namespace

Channel Class

• Represents a channel that subscribers can subscribe to.
• Methods:
  • Subscribe(Subscriber sub): Subscribes a subscriber to the channel.
  • UnSubscribe(Subscriber sub): Unsubscribes a subscriber from the channel.
  • NotifySubscriber(): Notifies all subscribers when an upload occurs.
  • Upload(String title): Uploads a new video with the given title.

IObserver Interface

• Represents an observer that can subscribe to channels.
• Methods:
  • Update(): Method to be implemented by concrete subscribers to update them about changes.
  • SubscribeChannel(Channel ch): Subscribes the observer to a specific channel.

Subscriber Class

• Represents a subscriber that observes a channel.
• Methods:
  • Update(): Updates the subscriber about changes in the channel.

Youtube Class

• Contains the main method for testing the C# Observer pattern implementation.

Feel free to explore each language-specific implementation for more details and usage examples.