What is the difference between doAfterSucces and doOnSuccess in Reactor?

Question

Reactor has a number of these methods, doOnSuccessOrError and doAfterSuccessOrError for example.

What is the material difference? The documentation doesn't clarify.

Answer 1

It is the matter of timing: "when the Mono terminates" and "after the Mono terminates". The doOnSuccessOrError notifies the handler before the downstream and the doAfterSuccessOrError notifies the handler after the downstream receives the respective terminal event.