Contents
How are DAOS and repositories the same?
Repositories and DAOs have the same purpose – to persist data permanently. Services on the other hand should be ignorant of persistence and have no knowledge about your database. They usually work tightly together with domain services, repositories, domain core.
How is a service defined in DDD terminology?
In DDD terminology, a service is an object that implements some logic without holding any state. Evans distinguishes between domain services, which encapsulate domain logic, and application services, which provide technical functionality, such as user authentication or sending an SMS message.
When to use tactical DDD in Business Design?
During the strategic phase of DDD, you are mapping out the business domain and defining bounded contexts for your domain models. Tactical DDD is when you define your domain models with more precision. The tactical patterns are applied within a single bounded context.
Can a domain service wrap a repository with persist?
But adding a domain service that wraps a repository with a method called persist adds little value. On that basis, if your application service is expressing a use case that calls for only working with a single aggregate, there is no problem using the repository directly from the application service.
How are domain services and repositories work together?
They usually work tightly together with domain services, repositories, domain core. Repositories are interfaces for storing and retrieving Aggregate Roots (AR), not single Entities. You have one Repository for each AR of your Domain Model.
How are repositories and DTOs similar to each other?
Repositories are – like you say – an abstraction. They originate from Martin Fowler’s Object Query Pattern. Both Repositories and DTOs can simplify database persistence by mapping persisted data to equivalent collection of entity objects.
Which is a common problem when applying DDD?
A common problem in applying DDD is when an entity requires access to data in a repository or other gateway in order to carry out a business operation. One solution is to inject repository dependencies directly into the entity, however this is often frowned upon.
https://www.youtube.com/watch?v=x6C20zhZHw8