Hands-On Spring Security 5 for Reactive Applications

The Mono reactive type

 

A Reactive Streams Publisher with basic Rx operators that completes successfully by emitting an element, or with an error.

– Mono JavaDoc

Mono<T> is a Publisher<T> that supports 0..1 elements.

The definition of Mono is as follows:

public abstract class Mono<T>    extends Object    implements Publisher<T>

As detailed in the documentation, the following figure shows the workings of Mono:

Figure 08: Working of Mono

Mono<Void> should be used for a Publisher that completes with no value. The documentation explains each method and how it works using a marble diagram, which is self-explanatory. Again, this type is also supported ...