Repository Pattern

Repository pattern is one of the Data Access Pattern, which is used to access the data from database or other data source. A repository pattern encapsulates the data access so the consumer no longer has to know about the underlying data structure.

Problem that repository pattern solves

• The controller / UI is tightly coupled with data access layer , if we are using data access from controller / UI.
• It is difficult to write a test for the controller / UI without side effects
• Hard to extends entities with domain specific behaviour.

Benefits of repository pattern

• The consumer is now separated (decoupled) from the data access
• Easy to write a test without side-effects.
• Modify and extend entities before they are passed on to the consumer.
• A sharable abstraction resulting in less duplication of code.
• Improved maintainability.