* This class is thread-safe.
 */
public class HostIntervalController extends DefaultIntervalController {

    /** Map storing the last access time for each host. */
    private final ConcurrentMap<String, AtomicLong> lastTimes = new ConcurrentHashMap<>();

    /**
     * Constructs a new HostIntervalController with default parameters.
     */
    public HostIntervalController() {
    }

    /**

        final UrlQueue q = CrawlingParameterUtil.getUrlQueue();
        for (int i = 0; i < numTasks; i++) {
            q.setUrl("http://example.com");
        }

        final HostIntervalController controller = new HostIntervalController();
        controller.delayMillisBeforeProcessing = waittime;
        controller.delayMillisAfterProcessing = 0L;
        controller.delayMillisForWaitingNewUrl = 0L;