Listener for Configuration Events. When a {@code ConfigurationEvent} isfired, it is asynchronously delivered to a {@code ConfigurationListener}.
{@code ConfigurationListener} objects are registered with the Frameworkservice registry and are notified with a {@code ConfigurationEvent} objectwhen an event is fired.
{@code ConfigurationListener} objects can inspect the received{@code ConfigurationEvent} object to determine its type, the pid of the{@code Configuration} object with which it is associated, and theConfiguration Admin service that fired the event.
Security Considerations. Bundles wishing to monitor configuration events will require {@code ServicePermission[ConfigurationListener,REGISTER]} to registera {@code ConfigurationListener} service.
@author $Id: b21e83c93cdb61cfd63205eec28b0baf36fd5da2 $
@since 1.2