如何在不阻塞的情况下从 Flux 获取列表？

Question

I have a repository that returns a flux and wanted to set the result to another object which is expecting a list. Is there any other way to get the results as a list without blocking?

The block is working but it is taking long time.

public class FluxToListTest {

    @Autowired PostRepository postRepository;

    public void setUserPosts(User user) {
      user.setPostList(postRepository.findAllByOrderId(user.getId()).collectList().block());
  }
}


interface PostRepository {

    Flux<Post> findAllByOrderId(final UUID userId);
}


@Data
class User {
  UUID id;
  List<Post> postList;
}


class Post {
    UUID id;
    String content;
}

Answer 1

In short - NO . You don't need to extract List from Flux . If you've started use Reactor Streams - stay with it.

Try this code:

public void setUserPosts(User user) {
    postRepository.findAllByOrderId(user.getId())
        .collectList()
        .doOnNext(user::setPostList)// (1)
        .subscribe();               // (2) 
}  

1. if you set operation is blocking please use publishOn / subscribeOn to avoid blocking for the all stream.
2. it starts your stream performing