public enum CrawlerStatus {
    /**
     * The crawler is initializing.
     */
    INITIALIZING,

    /**
     * The crawler is currently running.
     */
    RUNNING,

    /**
     * The crawler has completed its task.
     */
    DONE;

/**
 * Implementation of the {@link UrlFilterService} interface.
 * This class provides methods for managing URL filtering rules,
 * including adding include and exclude URL patterns, deleting patterns,
 * and retrieving lists of compiled URL patterns. It utilizes a
 * {@link MemoryDataHelper} to store and manage the URL patterns in memory.
 *
 */
public class UrlFilterServiceImpl implements UrlFilterService {

    /**

        crawler.urlFilter.addInclude("https://example.com/.*");
        
        // Execute crawling
        String sessionId = crawler.execute();
        System.out.println("Crawling completed. Session ID: " + sessionId);
    }
}
```

### File System Crawling

```java
import org.codelibs.fess.crawler.client.fs.FileSystemClient;

// Configure for file system crawling

      result of this License or out of the use or inability to use the
      Work (including but not limited to damages for loss of goodwill,
      work stoppage, computer failure or malfunction, or any and all
      other commercial damages or losses), even if such Contributor
      has been advised of the possibility of such damages.

     * @return a list of compiled regular expression patterns representing the URLs to include
     */
    List<Pattern> getIncludeUrlPatternList(String sessionId);

    /**
     * Retrieves a list of URL patterns to be excluded for a given session.
     *
     * @param sessionId the identifier of the session for which to retrieve the exclude URL patterns

        statusMap.put(CrawlerStatus.DONE, "Completed");

        // Verify entries
        assertEquals(3, statusMap.size());
        assertEquals("Starting up", statusMap.get(CrawlerStatus.INITIALIZING));
        assertEquals("In progress", statusMap.get(CrawlerStatus.RUNNING));
        assertEquals("Completed", statusMap.get(CrawlerStatus.DONE));

                    /**
                     * Loads filter patterns for the given session ID.
                     *
                     * @param key The session ID.
                     * @return The list of compiled patterns.
                     */
                    @Override
                    public List<Pattern> load(final String key) {

    public void addRule(final String key, final String regex) {
        regexMap.put(key, Pattern.compile(regex));
    }

    /**
     * Adds a compiled regular expression rule for the specified field.
     * @param key the field name to match against
     * @param pattern the compiled regular expression pattern
     */
    public void addRule(final String key, final Pattern pattern) {
        regexMap.put(key, pattern);
    }

      result of this License or out of the use or inability to use the
      Work (including but not limited to damages for loss of goodwill,
      work stoppage, computer failure or malfunction, or any and all
      other commercial damages or losses), even if such Contributor
      has been advised of the possibility of such damages.

                    }
                }
            });
        }

        startLatch.countDown();
        boolean completed = endLatch.await(30, TimeUnit.SECONDS);
        assertTrue("Test should complete within timeout", completed);
        executor.shutdown();

        assertEquals(threadCount * operationsPerThread * 2, successCount.get());