src/java.sql/share/classes/java/sql/DriverAction.java

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package java.sql;

/**
 * An interface that must be implemented when a {@linkplain Driver} wants to be
 * notified by {@code DriverManager}.
 *<P>
 * A {@code DriverAction} implementation is not intended to be used
 * directly by applications. A JDBC Driver  may choose
 * to create its {@code DriverAction} implementation in a private class
 * to avoid it being called directly.
 * <p>
 * The JDBC driver's static initialization block must call
 * {@linkplain DriverManager#registerDriver(java.sql.Driver, java.sql.DriverAction) } in order
 * to inform {@code DriverManager} which {@code DriverAction} implementation to
 * call when the JDBC driver is de-registered.
 * @since 1.8
 */
public interface DriverAction {
    /**
     * Method called by
     * {@linkplain DriverManager#deregisterDriver(Driver) }
     *  to notify the JDBC driver that it was de-registered.
     * <p>
     * The {@code deregister} method is intended only to be used by JDBC Drivers
     * and not by applications.  JDBC drivers are recommended to not implement
     * {@code DriverAction} in a public class.  If there are active
     * connections to the database at the time that the {@code deregister}
     * method is called, it is implementation specific as to whether the
     * connections are closed or allowed to continue. Once this method is
     * called, it is implementation specific as to whether the driver may
     * limit the ability to create new connections to the database, invoke
     * other {@code Driver} methods or throw a {@code SQLException}.
     * Consult your JDBC driver's documentation for additional information
     * on its behavior.
     * @see DriverManager#registerDriver(java.sql.Driver, java.sql.DriverAction)
     * @see DriverManager#deregisterDriver(Driver)
     * @since 1.8
     */
    void deregister();

}