Repository Pattern

Definitions

1. A design pattern that mediates between domain logic and data mapping layers, providing a collection-like interface for accessing domain objects. The repository abstracts the data source — business logic calls userRepo.findByEmail() without knowing whether it queries SQL, an API, or an in-memory store. Enables easy mocking in tests.

   In plain English: An abstraction layer that hides where data comes from, so business code just asks for objects without knowing about the database.

   Example: "The UserRepository interface has findById, save, and delete — the PostgresUserRepository implements it, but tests use an InMemoryUserRepository."

Related Terms

• Webhook vs. Polling
• Hexagonal Architecture
• Factory Pattern
• Observer Pattern
• Strategy Pattern
• Builder Pattern
• Adapter Pattern
• Clean Architecture