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How does the repository service pattern work in a web application?
Further, they introduce a layer of abstraction between the web application and the Repositories so that they can change more independently. The Repository-Service pattern relies on dependency injection to work properly. Classes at each layer of the architecture will have classes they need from the “lower” layers injected into them.
Conceptually, a repository encapsulates a set of objects stored in the database and operations that can be performed on them, providing a way that is closer to the persistence layer. Repositories, also, support the purpose of separating, clearly and in one direction, the dependency between the work domain and the data allocation or mapping.
Which is the upper layer repository or service?
So, if your models are Dogs, Cats, and Rats, you would have a Repository for each, the DogRepository would not call anything in the CatRepository, and so on. The upper layer is the Services.
How is a repository related to a unit of work?
A repository marks the data with the operations you want to perform in the memory of a unit of work object (as in EF when using the DbContext class), but these updates aren’t performed immediately to the database. A unit of work is referred to as a single transaction that involves multiple insert, update, or delete operations.
How does a service write to a repository?
The repository writes to an external service (using a Gateway and the Circuit Breaker patterns underneath). We also have some other services and repositores that read data from Table Storage, Queues, etc., all of which can be abstracted into a Repository. Why go through all this trouble?
How does a repository work in a model class?
These classes handle getting data into and out of our data store, with the important caveat that each Repository only works against a single Model class. So, if your models are Dogs, Cats, and Rats, you would have a Repository for each, the DogRepository would not call anything in the CatRepository, and so on.
Which is the upper layer of the repository pattern?
The upper layer is the Services. These classes will have Repositories injected to them and can query multiple Repository classes and combine their data to form new, more complex business objects. Further, they introduce a layer of abstraction between the web application and the Repositories so that they can change more independently.