Reactive Programming (Reactor)- Part 1

Introduction

In Traditional API servers, to deal with a large number of concurrent users, requests handling are made asynchronous. These solutions are based on several options (Callbacks, Future, CompletableFuture …).
We may think that using this kind of approach we can be completely asynchronous and be always available and performant, remember that each thread requires stack memory, there is always a limitation (error handling, call-back hell …), not to say that these are bad solutions, I just want to emphasize that it has not been designed to deal with…