```
public interface ShutdownListener
```
A listener that can be registered to control the shutdown process and implement graceful shutdown. Shutdown happens in two phases. In the pre shutdown phase the application should function normally, but should notify external systems that it is about to go away. In the shutdown phase the app should disallow new external requests, however allow existing requests to complete normally.

All Methods Instance Methods Default Methods
Modifier and Type	Method	Description
`default void`	`preShutdown(ShutdownListener.ShutdownNotification notification)`	Pre shutdown notification, the listener can use this to notify external systems this application is about to shut down.
`default void`	`shutdown(ShutdownListener.ShutdownNotification notification)`	The shutdown notification.

Interface ShutdownListener