Implementation of various design patterns in C++, Java and Python.

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Description: Strategy Pattern in implemented in a primitive VideoStreaming service, that automatically changes Streaming Strategy in run-time based on network speed of the client.

• Java Implementation
• Python Implementation

Description: A Digital News Agency and Subscriber has been designed to demonstrate the Observer pattern. Whenever there is a new news added to the NewsAgency(The Publisher/Observable), all its subscribers are notified.

• Java Implementation
• Python Implementation

Description: Decorator pattern adds additional functionality to the existing classes. This pattern satisfies the Open-Close principle.

Example Description: This example implements the Decorator Pattern to simulate a Coffee Shop billing system, where the users can customize the coffee with condiments in infinite possibilities.

• Java Implementation
• Python Implementation

Decorator Pattern is used to simulate a Notification system. The user can opt in for combination of multiple notification channels like SMS, Slack and Facebook along with the default Email notification channel.

• Java Implementation
• Python Implementation

Description:

Example Description: Simple Database Adapter - implements Factory method. Makes use of Two Factories - one for SQL and another for NoSQL that helps create different Databases, and perform queries on them.

• Java Implementation
• Python Implementation

Description: Abstract Factory is a creational design pattern that lets us produce families of related objects without specifying their concrete classes. Definition Source.

Example Description: Abstract Factory Pattern is implemented here with an example of a Furniture Store. We consider three different styles of furniture - Victorian, Modern and ArtDeco. Also, There are three furniture products in each style - Table, Chair and Sofa. Which essentially adds upto 9 products, and should be flexible to expand. Abstract Factory is implemented to approach this challenge.

• Java Implementation
• Python Implementation

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