An interface that must be implemented when a Driver wants to be
notified by DriverManager.
A DriverAction implementation is not intended to be used
directly by applications. A JDBC Driver may choose
to create its DriverAction implementation in a private class
to avoid it being called directly.
The JDBC driver's static initialization block must call
DriverManager.registerDriver(java.sql.Driver, java.sql.DriverAction) in order
to inform DriverManager which DriverAction implementation to
call when the JDBC driver is de-registered.