Application Service: An Application Service is a stateless service that implements use cases of the application. An application service typically gets and returns DTOs. It is used by the Presentation Layer. It uses and coordinates the domain objects to implement the use cases. A use case is typically considered as a Unit Of Work. Data Transfer Object (DTO): A DTO is a simple object without any business logic that is used to transfer state (data) between the Application and Presentation Layers. Unit of Work (UOW): A Unit of Work is an atomic work that should be done as a transaction unit. All the operations inside a UOW should be committed on success or rolled back on a failure.
Building blocks
- Application service. Stateless. Typically gets and returns DTO.
- Data Transfer Object (DTO). Simple object without any business logic used for transfers between application and presentation layers.