* {@link #isContinue(int)} method returns {@code false}.
 * </p>
 *
 */
public class CrawlerThread implements Runnable {
    /**
     * Constructs a new CrawlerThread.
     */
    public CrawlerThread() {
        // Default constructor
    }

    /**
     * Service for managing URL queues during crawling.
     */
    @Resource

        for (int i = 0; i < crawlerContext.getNumOfThread(); i++) {
            final CrawlerThread crawlerThread = crawlerContainer.getComponent("crawlerThread");
            crawlerThread.setCrawlerContext(crawlerContext);
            crawlerThread.setClientFactory(clientFactory);
            threads[i] =
                    new Thread(crawlerThreadGroup, crawlerThread, "Crawler-" + crawlerContext.sessionId + "-" + Integer.toString(i + 1));

	<!-- Crawler -->
	<component name="crawler" class="org.codelibs.fess.crawler.Crawler" instance="prototype" >
	</component>

	<!-- Crawler Thread -->
	<component name="crawlerThread" class="org.codelibs.fess.crawler.CrawlerThread" instance="prototype" >
	</component>

	<!-- Entity -->
	<component name="accessResult"
		class="org.codelibs.fess.crawler.entity.OpenSearchAccessResult" instance="prototype">
	</component>

	<!-- Crawler -->
	<component name="crawler" class="org.codelibs.fess.crawler.Crawler" instance="prototype" >
	</component>

	<!-- Crawler Thread -->
	<component name="crawlerThread" class="org.codelibs.fess.crawler.CrawlerThread" instance="prototype" >
	</component>

	<!-- Entity -->
	<component name="accessResult" class="org.codelibs.fess.crawler.entity.AccessResultImpl" instance="prototype" >
	</component>

        })
                .prototype("accessResult", AccessResultImpl.class)
                .prototype("urlQueue", UrlQueueImpl.class)
                .prototype("crawlerThread", CrawlerThread.class)
                .prototype("crawler", Crawler.class)
                .prototype("urlFilterService", UrlFilterServiceImpl.class)
                .prototype("urlQueueService", UrlQueueServiceImpl.class)

```

### Key Components

#### Core Engine
- **Crawler**: Main orchestrator managing crawl execution
- **CrawlerContext**: Execution context and configuration
- **CrawlerThread**: Individual crawler thread implementation

#### Client Architecture
- **HcHttpClient**: HTTP/HTTPS client using Apache HttpComponents
- **FileSystemClient**: File system access
- **FtpClient**: FTP protocol support