}

    /**
     * Sets the maximum depth for nested structure extraction.
     *
     * @param maxDepth the maximum depth
     */
    public void setMaxDepth(final int maxDepth) {
        this.maxDepth = maxDepth;
    }

    /**
     * Sets the field separator for key-value pairs.
     *
     * @param fieldSeparator the field separator
     */

        if (dataMap.remove(getParamValue(paramMap, "field.max_depth", "max_depth")) instanceof final String maxDepth
                && StringUtil.isNotBlank(maxDepth)) {
            try {
                return Integer.parseInt(maxDepth);
            } catch (final NumberFormatException e) {
                if (logger.isDebugEnabled()) {
                    logger.warn("Failed to parse max_depth: '{}'. Expected: integer value", maxDepth, e);

     * @return The maximum depth.
     */
    public int getMaxDepth() {
        return maxDepth;
    }

    /**
     * Sets the maximum depth.
     * @param maxDepth The maximum depth.
     */
    public void setMaxDepth(final int maxDepth) {
        this.maxDepth = maxDepth;
    }

    /**
     * Returns the maximum access count.
     * @return The maximum access count.

        assertFalse(result);
    }

    /**
     * Test isValid method with depth exceeding maxDepth.
     */
    public void test_isValid_exceedsMaxDepth() throws Exception {
        final UrlQueue<?> urlQueue = new UrlQueueImpl<>();
        urlQueue.setUrl("http://example.com/");
        urlQueue.setDepth(5); // Exceeds maxDepth of 3

        when(urlFilter.match(anyString())).thenReturn(true);

        crawlerContext.maxThreadCheckCount = maxThreadCheckCount;
    }

    /**
     * Sets the maximum depth.
     * @param maxDepth The maximum depth.
     */
    public void setMaxDepth(final int maxDepth) {
        crawlerContext.maxDepth = maxDepth;
    }

    /**
     * Sets the maximum access count.
     * @param maxAccessCount The maximum access count.
     */

```java
String sessionId                // Format: yyyyMMddHHmmssSSS
volatile CrawlerStatus status   // DONE, RUNNING
AtomicLong accessCount          // Thread-safe counter
int numOfThread = 10            // Crawler threads
int maxDepth = -1               // Max depth (-1 = unlimited)
long maxAccessCount = 0         // Max URLs (0 = unlimited)
```

### CrawlerThread (`CrawlerThread.java`)

Worker thread for crawling.

        crawlerContext.setMaxThreadCheckCount(Integer.MAX_VALUE);
        assertEquals(Integer.MAX_VALUE, crawlerContext.getMaxThreadCheckCount());
    }

    /**
     * Test maxDepth getter and setter
     */
    public void test_maxDepth() {
        assertEquals(-1, crawlerContext.getMaxDepth());

        crawlerContext.setMaxDepth(5);
        assertEquals(5, crawlerContext.getMaxDepth());

	<component name="filenameExtractor"
		class="org.codelibs.fess.crawler.extractor.impl.FilenameExtractor" />
	<component name="jsonExtractor"
		class="org.codelibs.fess.crawler.extractor.impl.JsonExtractor">
		<property name="maxDepth">10</property>
		<property name="extractMetadata">true</property>
	</component>
	<component name="csvExtractor"
		class="org.codelibs.fess.crawler.extractor.impl.CsvExtractor">
		<property name="hasHeader">true</property>