/**
 * Marks a custom annotation as a defining an identifier generator.
 * <p/>
 * Custom annotations must have retention policy {@link RetentionPolicy#RUNTIME}.
 */
public interface CustomIdentifierGeneratorAnnotationMarker {
    Class<? extends IdentifierGeneratorBuilder> builder();
}

public interface IdentifierGeneratorBuilder {
    public IdentifierGenerator getIdentifierGenerator(Annotation customAnnotation, ... );
}