* and ignored. Otherwise, they will be re-thrown as {@link CrawlerSystemException}.
 * </p>
 *
 */
public abstract class AbstractIntervalController implements IntervalController {

    private static final Logger logger = LogManager.getLogger(AbstractIntervalController.class);

    /**
     * Indicates whether exceptions during the delay process should be ignored.

 * and when waiting for new URLs.
 * The delays are configurable via constructor parameters.
 *
 */
public class DefaultIntervalController extends AbstractIntervalController {

    /** Delay in milliseconds after processing a URL */
    protected long delayMillisAfterProcessing = 0L;

    /** Delay in milliseconds when no URL is in the queue */