Description: MediatR is a simple and unambitious mediator implementation in .NET that allows communication between components of an application in a decoupled manner. Its main goal is to facilitate interaction between different parts of a system, such as commands, queries, and events, without these parts needing to know about each other. This is achieved through the Mediator design pattern, which promotes separation of concerns and improves code maintainability. MediatR is characterized by its simplicity and lightweight nature, making it an attractive option for developers looking for an efficient solution to manage internal communication in applications. Additionally, its integration with dependency injection containers allows for smooth configuration and intuitive use. MediatR is particularly useful in architectures based on CQRS (Command Query Responsibility Segregation), where read and write operations are separated, allowing for greater clarity and organization in the code. In summary, MediatR is a powerful tool that helps developers build cleaner and more scalable applications, promoting a design approach that favors modularity and code reuse.
History: MediatR was created by Jimmy Bogard and was first released in 2014. Since then, it has evolved and become one of the most popular libraries for implementing the Mediator pattern in applications. Its development has been driven by the community, with ongoing contributions and improvements that have expanded its functionality and ease of use.
Uses: MediatR is primarily used in applications to manage communication between components in a decoupled manner. It is especially useful in architectures that follow the CQRS pattern, where read and write operations are separated. It can also be used to handle events and notifications within an application, facilitating the implementation of patterns like Event Sourcing.
Examples: A practical example of MediatR is its use in an order management application, where commands to create, update, or delete orders are sent through MediatR, allowing the application’s controllers to remain clean and focused on presentation logic. Another example is in a blogging application, where queries to retrieve posts are handled through MediatR, separating data access logic from presentation logic.
