Doubts on how to use the reactive paradigm with DDD - Domain repositories

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I am working on a project where the DDD methodology is going to be used for the development and, due to the business needs, a reactive programming approach is going to be used.

I am modeling the domain, and some doubts have arisen when I was working on the definition of the repositories. I see the problem when implementing the repositories, through an adapter, because using reactive programming, all methods return Uni or Multi (Mutiny! will be used). This is a problem because I am introducing dependencies with the framework in the domain, which violates DDD principles.

I have seen some posts on this forum (e.g.: DDD Java with Spring - Repository returning Mono/Flux), but I am not confident with the solution proposed. Has anyone been able to deal with this challenge effectively?

quarkus reactive-programming ddd-repositories domain-driven-design java
1 Answers

You can declare your domain repository interface with generic type:

public interface MyRepositoryOutgoingPort <T> {
  T persist(My my);
}

And in reactive (e.g. Mongo) implementation you can wrap the result:

@Repository
public interface MyRepositoryMongoImpl
extends ReactiveMongoRepository<My, UUID>,
    MyRepositoryOutgoingPort<Mono<My>> {

  @Override
  default Mono<My> persist(My my) {
    Mono<My> savedMy = save(my);
    return savedMy;
  }
}
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