Abstract Factory Design Pattern

Text version of the video http://csharp-video-tutorials.blogspot.com/2017/08/abstract-factory-design-pattern.html Healthy diet is very important both for the body and mind. If you like Aarvi Kitchen recipes, please support by sharing, subscribing and liking our YouTube channel. Hope you can help. https://www.youtube.com/channel/UC7sEwIXM_YfAMyonQCrGfWA/?sub_confirmation=1 Slides http://csharp-video-tutorials.blogspot.com/2017/08/abstract-factory-design-pattern_21.html Design Patterns Tutorial playlist https://www.youtube.com/playlist?list=PL6n9fhu94yhUbctIoxoVTrklN3LMwTCmd Design Patterns Text articles and slides http://csharp-video-tutorials.blogspot.com/2017/06/design-patterns-tutorial-for-beginners.html All Dot Net and SQL Server Tutorials in English https://www.youtube.com/user/kudvenkat/playlists?view=1&sort=dd All Dot Net and SQL Server Tutorials in Arabic https://www.youtube.com/c/KudvenkatArabic/playlists In this session we will learn 1. What is Abstract Factory Design Pattern 2. Implementation Guidelines 3. Abstract factory implementation 4. Differences between Factory Method and Abstract Factory Pattern What is Abstract Factory Design Pattern Gang Of Four Definition : "The Abstract factory pattern provides a way to encapsulate a group of individual factories that have a common theme without specifying their concrete classes" The Abstract Factory Pattern provides an interface for creating families of related or dependent objects without specifying their concrete classes Abstract Factory pattern belongs to creational patterns and is one of the most used design patterns in real world applications Abstract factory is a super factory that creates other factories Implementation Guidelines We need to Choose Abstract Factory Pattern when 1. The application need to create multiple families of objects or products 2. We need to use only one of the subset of families of objects at a given point of time 3. We want to hide the implementations of the families of products by decoupling the implementation of each of these operations Business Requirement : Handout computers to Contract and Permanent employees based on the designation and employee type with below specifications Permanent Employee 1. Managerial Position is eligible for Apple MAC Book Laptop 2. Non Managerial Position is eligible for Apple IMac desktop Contract Employee 1. Managerial Position is eligible for Dell Laptop 2. Non Managerial Position is eligible for Dell desktop Abstract Factory Representation 1. Client is a class which use AbstractFactory and AbstractProduct interfaces to create a family of related objects. 2. AbstractFactory is an interface which is used to create abstract product 3. ConcreteFactory is a class which implements the AbstractFactory interface to create concrete products. 4. AbstractProduct is an interface which declares a type of product. 5. ConcreteProduct is a class which implements the AbstractProduct interface to create product. Difference between Abstract Factory and Factory Method 1. Abstract factory pattern adds a layer of abstraction to the factory method pattern 2. Abstract factory pattern implementation can have multiple factory methods 3. Similar products of a factory implementation are grouped in Abstract factory 4. Abstract Factory uses object composition to decouple applications form specific implementations 5. Factory Method uses inheritance to decouple applications form specific implementations