code: final void dispatchToAppender(final String message) {
      // dispatch a copy, since events should be treated as being immutable
      final FoundationFileRollingAppender appender = this.getSource();
      if (appender != null) {
        appender.append(new FileRollEvent(this, message));
      }
    }
docs: Convenience method dispatches this object to the source appender, which
  will result in the custom message being appended to the new file.
  
  @param message
  The custom logging message to be appended.