Simple one liners :- Design pattern and MVC training in Mumbai.

Our trainer Mr. Shivprasad Koirala completed almost 100 lectures of design pattern in SBS ( and big companies.

Below are simple one liner revisions from his class.

These are not GOF, EVANS, Grady definitions as i find them pretty complex. So its in my own words what i understood. Any rectifications let me know.

DDD :- Your code architecture should reflect the domain model.

Ubiquitous Language :- Developer and end users who will use the software should speak same language.

Repository :- Decouples Dal and Model.

UOW :- Implements transaction in Repositories.

Aggregate root :- All contained objects are controlled through a central object.

Iterator :- You want to browse Aggregate root contained objects and also respect integrity of Aggregate root.

Context Boundary :- A Customer object of validation is different from a DTO customer object.

CQRS :- Insert , update , delete objects are different from Search and query objects.

Simple Factory :- Decouples simple single object creation.

Factory pattern :- Complex permutation and combination object creation.

Prototype :- Create a clone copy of the current object.

Mediator :- Simplifies complex and chatty communication between objects.

Facade :- Simplified interface over lot of subsystems.

Decorator :- Add logics dynamically without touching the main logic. Good for maintenance scenarios.

Template method :- Fixed sequence but you want to override the individual steps of the sequence.

Composite :- Treat aggregate and composed objects in a uniform manner.

Adapter :- You have third party interfaces which you want to make it compatible with your project interfaces.

NULL pattern :- Object does nothing , its like by just bypassing / mocking.

Proxy :- Not used much , in .NET auto implemented mostly by WCF, WS.

Flyweight :- Reduce RAM stress by creating shared copy of same data.

Singleton :- A single instance which supports thread safety and lazy loading.

Interpreter :- For creating language elements like “Book ticket del-mum” and it should just work.

Memento :- Capture object state so that it can be reversed. Like Cancel and Reset functionality.

DTO :- Simple setters and getter for transferring data across layers.



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