since its 2.3 release, SpringBoot has the feature called "graceful shutdown". When a certain signal is received by the JVM, SpringBoot executes some code (because it registers a callback within the JVM) so that the application is shut down gracefully.
In the course of the shutdown process, the application context is closed, traffic is not accepted anymore, beans get destroyed etc. This is described in this section of the SpringBoot docs and elsewhere.
My question is: is it possible to get notified about the fact that SpringBoot has initiated a shutdown? By "get notified" I mean (ideally) this: I want to have a bean which would be part of the application context. This bean should get a notification (one of its methods should be called or via events) when the shutdown is initiated but before any actions are taken in that direction. I.e. @PreDestroy and other lifecycle callbacks are too late IMO. My desired notification should come earlier (when the traffic is still accepted).
I could of course register my own callback within the JVM but it wouldn't look good and also I could not be sure whether my callback is executed before or after the SpringBoot's one.
Thank you for any hints.
