protected CrawlerContext crawlerContext;

    /**
     * Flag indicating whether the crawler runs in background mode.
     */
    protected boolean background = false;

    /**
     * Flag indicating whether crawler threads run as daemon threads.
     */
    protected boolean daemon = false;

    /**
     * Priority for crawler threads.
     */
    protected int threadPriority = Thread.NORM_PRIORITY;

    GcFinalization.awaitClear(ref);
  }

  public void testDefaultBehaviorOfPeekForEmptyIteration() {

    AbstractIterator<Integer> empty =
        new AbstractIterator<Integer>() {
          private boolean alreadyCalledEndOfData;

          @Override
          public @Nullable Integer computeNext() {
            if (alreadyCalledEndOfData) {
              fail("Should not have been invoked again");
            }

      implements ListeningScheduledExecutorService {

    private volatile boolean shutdown;

    @Override
    public void shutdown() {
      shutdown = true;
    }

    @Override
    public List<Runnable> shutdownNow() {
      shutdown();
      return ImmutableList.of();
    }

    @Override
    public boolean isShutdown() {
      return shutdown;
    }

    @Override

    checkNotNull(action).accept(singleKey, singleValue);
  }

  @Override
  public boolean containsKey(@Nullable Object key) {
    return singleKey.equals(key);
  }

  @Override
  public boolean containsValue(@Nullable Object value) {
    return singleValue.equals(value);
  }

  @Override
  boolean isPartialView() {
    return false;
  }

  @Override
  ImmutableSet<Entry<K, V>> createEntrySet() {

     *
     * @return True if the item has been updated.
     */
    public boolean isUpdated() {
        return newToken != null;
    }

    /**
     * Returns true if the item has been deleted.
     *
     * @return True if the item has been deleted.
     */
    public boolean isDeleted() {
        return isUpdated() && newToken.length() == 0;
    }

    @Override

   */
  @Override
  @CanIgnoreReturnValue
  public boolean offer(E e) {
    return add(e);
  }

  /**
   * Adds the given element to this queue. If the queue is currently full, the element at the head
   * of the queue is evicted to make room.
   *
   * @return {@code true} always
   */
  @Override
  @CanIgnoreReturnValue
  public boolean add(E e) {
    checkNotNull(e); // check before removing

    long bits = doubleToRawLongBits(d);
    bits &= SIGNIFICAND_MASK;
    return (exponent == MIN_EXPONENT - 1) ? bits << 1 : bits | IMPLICIT_BIT;
  }

  static boolean isFinite(double d) {
    return getExponent(d) <= MAX_EXPONENT;
  }

  static boolean isNormal(double d) {
    return getExponent(d) >= MIN_EXPONENT;
  }

  /*
   * Returns x scaled by a power of 2 such that it is in the range [1, 2). Assumes x is positive,

 *
 * @since 4.0.0
 */
@Experimental
@Provider
public interface Log {
    /**
     * {@return true if the <b>debug</b> error level is enabled}
     */
    boolean isDebugEnabled();

    /**
     * Sends a message to the user in the <b>debug</b> error level.
     *
     * @param content the message to log
     */
    void debug(CharSequence content);

    /**

     * @return true if enabled, false otherwise
     */
    public boolean isEnabled() {
        return enabled;
    }

    /**
     * Sets whether robots.txt processing is enabled.
     * @param enabled true to enable, false to disable
     */
    public void setEnabled(final boolean enabled) {
        this.enabled = enabled;
    }

            logger.debug("Initializing {}", HcHttpClient.class.getName());
        }

        super.init();

        // robots.txt parser
        final Boolean robotsTxtEnabled = getInitParameter(ROBOTS_TXT_ENABLED_PROPERTY, Boolean.TRUE, Boolean.class);
        if (robotsTxtHelper != null) {
            robotsTxtHelper.setEnabled(robotsTxtEnabled);
        }

        // httpclient