What is relationship between Repository and Unit of Work?
The Repository Pattern and the Unit of Work pattern are often used together in software development, particularly when dealing with data access and persistence. They serve distinct but complementary purposes. Here’s an explanation of their relationship:
- Repository Pattern: The Repository Pattern provides an abstraction layer between the business logic of an application and the underlying data access layer. It encapsulates the logic for querying, retrieving, updating, and deleting entities, providing a consistent and uniform interface for accessing and managing data.
- Repositories are responsible for encapsulating the logic for interacting with individual entities or aggregates. They abstract away the specific details of how data is stored or retrieved, providing a high-level API to the application’s business logic.
- Repositories typically expose methods for querying entities based on specific criteria, as well as methods for saving, updating, and deleting entities.
- Repositories can be seen as the bridge between the business logic and the persistence layer, providing a clean and organized way to interact with the underlying data storage.
- Unit of Work: The Unit of Work pattern is concerned with managing a unit of work, which typically represents a single transaction or a logical unit of work within the application. It provides a way to track and manage changes to entities and coordinate their persistence to the underlying data storage.
- The Unit of Work pattern ensures that multiple database operations related to a particular business operation or use case are treated as a single atomic operation. It allows for the coordination and consistency of data changes within a transaction.
- The Unit of Work typically wraps the repository operations within a transaction scope, ensuring that changes made to entities are committed or rolled back as a single unit. It provides methods for marking entities as new, modified, or deleted, and it handles the persistence of these changes when the unit of work is committed.
The relationship between the Repository Pattern and the Unit of Work pattern is that the Unit of Work often utilizes one or more repositories to perform the necessary data access and persistence operations. The Unit of Work coordinates the repository operations and ensures that changes made within a unit of work are handled correctly.
In practice, the Unit of Work pattern manages the lifecycle of a transaction or a logical unit of work, while repositories handle the specific data access operations within that unit of work. Repositories provide a higher-level interface for the business logic to interact with entities, and the Unit of Work handles the coordination and persistence of changes made to those entities.
By using both patterns together, you can achieve a clean separation of concerns, modularize data access operations, and ensure the consistency and atomicity of database transactions within the context of a unit of work.