Spring WebFlux - Convert Flux to List<Object> - spring

Question

I am learning Spring WebFlux.
My Entity goes like this:
#Table("users")
public class User {
#Id
private Integer id;
private String name;
private int age;
private double salary;
}
I have a Repository (R2 using H2 Database) like below:
public interface UserRepository extends ReactiveCrudRepository<User,Integer> {
}
And my controller is:
#Autowired
private UserRepository userRepository;
private static List<User> userList = new ArrayList<>();
#PostConstruct
public void initializeStockObjects() {
User stock1 = new User(11, "aaaa", 123, 123);
User stock2 = new User(12, "bbb", 123, 123);
User stock3 = new User(13, "ccc", 123, 123);
userList.add(stock1);
userList.add(stock2);
userList.add(stock3);
}
#RequestMapping(value = "/livelistofusers", method = RequestMethod.GET, produces = MediaType.TEXT_EVENT_STREAM_VALUE)
public Flux<List<User>> getUsers() {
return getUserData(userList);
}
public Flux<List<User>> getUserData(List<User> userList) {
Flux<Long> interval = Flux.interval(Duration.ofSeconds(3));
interval.subscribe((i) -> userList.forEach(user -> addNewUser(user)));
Flux<List<User>> transactionFlux = Flux.fromStream(Stream.generate(() -> userList));
return Flux.zip(interval, transactionFlux).map(Tuple2::getT2);
}
All good till this point. I am able to return the the entire list of users every 3 seconds to the view. No issues at all here.
Now, I want to send the Flue i.e. Flux flux2 = userRepository.findAll() to the view. That means, instead of return getUserData(userList); how can I do return getUserData(flux2(...what should I do here ???... I tried couple of things but I end up making the Blocking list instead of Non-Blocking ...)); ?
Question: How can I achieve this? i.e. How can I send the entire Flux every 3 seconds to my view. I am feeling lost here and clueless. Any relevant help links or solution will be greatly appreciated.
Edit:
As per Nipuna's comments I tried this:
#RequestMapping(value = "/livelistofusersall", method = RequestMethod.GET, produces = MediaType.TEXT_EVENT_STREAM_VALUE)
public Flux<List<User>> getUsersall() {
Flux<Long> interval = Flux.interval(Duration.ofSeconds(3));
interval.subscribe((i) -> userRepository.findAll());
Flux<List<User>> transactionFlux = userRepository.findAll().collectList().flatMapMany(Flux::just);
return Flux.zip(interval, transactionFlux).map(Tuple2::getT2);
}
But now at my context path, the list loads but "only once" after a wait of 3 seconds. What I am missing here?

Answer 1

You can use collectList() operator in Flux for this which gives a Mono of List.
userRepository.findAll().collectList().flatMapMany(Flux::just);