Completable Future - 1milio/notes GitHub Wiki
#Some help:
- https://www.baeldung.com/java-completablefuture
- https://books.google.it/books?id=AH_EDwAAQBAJ&pg=PA249&lpg=PA249&dq=quarkus+CompletionStage&source=bl&ots=ZIfRA9nMld&sig=ACfU3U3pUMCO7C7u5KKug6o3rw3_WeKkmA&hl=it&sa=X&ved=2ahUKEwjZl_a71unmAhXS3KQKHZXTBTUQ6AEwBHoECAoQAQ#v=onepage&q=quarkus%20CompletionStage&f=false