*/
    @Override
    public void setLastModified(final Long lastModified) {
        this.lastModified = lastModified;
    }

    @Override
    public float getWeight() {
        return weight;
    }

    @Override
    public void setWeight(float weight) {
        this.weight = weight;
    }

    /**
     * Returns a string representation of this object.
     * @return A string representation.

    /**
     * Constructs a new MarkdownExtractor and initializes the parser.
     */
    public MarkdownExtractor() {
        super();
        initializeParser();
    }

    @Override
    public int getWeight() {
        return 2; // Higher priority than TikaExtractor (weight=1)
    }

    /**
     * Initializes the Markdown parser with extensions.
     */
    protected void initializeParser() {

                    uq.setParentUrl(url);
                    uq.setSessionId(crawlerContext.getSessionId());
                    uq.setUrl(d.getUrl());
                    uq.setWeight(d.getWeight());
                    return uq;
                })
                .collect(Collectors.toList());

        if (!childList.isEmpty()) {

            @Override
            public void setCreateTime(Long createTime) {
            }

            @Override
            public float getWeight() {
                return 0;
            }

            @Override
            public void setWeight(float weight) {
            }
        };
    }

    public void test_urlQueue_setAndGet() {
        // Initially should be null

        final OpenSearchUrlQueue first = urlQueueService.poll(sessionId);
        assertNotNull(first);
        // Weight should be highest
        assertTrue(first.getWeight() >= 1);

        urlQueueService.delete(sessionId);
    }

    public void test_offerAll_emptyListTx() {
        final String sessionId = "offer_session1";
        final List<OpenSearchUrlQueue> emptyList = new ArrayList<>();

    /**
     * Constructs a new CsvExtractor.
     */
    public CsvExtractor() {
        super();
    }

    @Override
    public int getWeight() {
        return 2; // Higher priority than TikaExtractor (weight=1)
    }

    @Override
    public ExtractData getText(final InputStream in, final Map<String, String> params) {
        validateInputStream(in);

    protected int maxArrayElements = 100;

    /**
     * Constructs a new JsonExtractor.
     */
    public JsonExtractor() {
        super();
    }

    @Override
    public int getWeight() {
        return 2; // Higher priority than TikaExtractor (weight=1)
    }

    @Override
    public ExtractData getText(final InputStream in, final Map<String, String> params) {
        validateInputStream(in);

                        // head method
                        responseData =
                                client.execute(RequestDataBuilder.newRequestData().head().url(url).weight(urlQueue.getWeight()).build());
                        if (responseData == null) {
                            return true;
                        }

      return new DummyValueReference<>();
    }

    @Override
    public V get() {
      return value;
    }

    @Override
    public int getWeight() {
      return 1;
    }

    @Override
    public @Nullable ReferenceEntry<K, V> getEntry() {
      return null;
    }

    @Override
    public ValueReference<K, V> copyFor(

      return new DummyValueReference<>();
    }

    @Override
    public V get() {
      return value;
    }

    @Override
    public int getWeight() {
      return 1;
    }

    @Override
    public @Nullable ReferenceEntry<K, V> getEntry() {
      return null;
    }

    @Override
    public ValueReference<K, V> copyFor(