Start-up messages for features.
Announcer allows feature libraries to announce themselves upon start-up. A provided just provides an implementation of the following class:
public interface Announcer {
/**
* Returns a greeting that is to be output upon
* system start-up.
* <p>
* Returning an empty String prevents output.
*
* @return a greeting that is to be output upon
* system start-up
*/
String greeting();
}