import jcifs.internal.util.SMBUtil;
import jcifs.smb.SmbFile;

/**
 * Handles directory change notifications for SMB3 directory leasing
 */
public class DirectoryChangeNotifier {

    private static final Logger log = LoggerFactory.getLogger(DirectoryChangeNotifier.class);

    // Backoff and timing constants (in ms)
    private static final long BASE_POLL_INTERVAL = 1000;
    private static final long MAX_POLL_INTERVAL = 30000;

        assertFalse(entry.hasChild("file1.txt"));

        // Test FILE_MODIFIED
        entry.updateChild("file2.txt", 2048L, 2000L, false, 0x20, 600L, 900L);
        directoryLeaseManager.handleDirectoryChange(directoryPath, "file2.txt", DirectoryChangeNotifier.DirectoryChangeType.FILE_MODIFIED);

    private final ConcurrentHashMap<String, DirectoryCacheEntry> directoryCache;
    private final ConcurrentHashMap<Smb2LeaseKey, String> leaseToPath;
    private final ScheduledExecutorService scheduler;
    private final DirectoryChangeNotifier changeNotifier;

    /**
     * Create a new directory lease manager
     *
     * @param context CIFS context
     * @param leaseManager base lease manager
     */

    private final ConcurrentHashMap<Smb2LeaseKey, String> leaseToPath;
    private final ScheduledExecutorService scheduler;
    
    // Change notification integration
    private final DirectoryChangeNotifier changeNotifier;
    
    public DirectoryLeaseManager(CIFSContext context, LeaseManager leaseManager) {
        this.context = context;
        this.baseLeaseManager = leaseManager;

        // Step 8: Test change notifications
        // Simulate file addition
        directoryLeaseManager.handleDirectoryChange(directoryPath, "newfile.txt", DirectoryChangeNotifier.DirectoryChangeType.FILE_ADDED);

        // Cache should be invalidated
        assertFalse(cacheEntry.isComplete());

        // Step 9: Test lease break
        // Re-populate cache

```
Package: jcifs.internal.smb2.lease
├── DirectoryLeaseContext.java    - Directory-specific lease context
├── DirectoryLeaseCache.java      - Directory metadata cache
└── DirectoryChangeNotifier.java  - Directory change tracking
```

#### 4.2 Implementation Tasks
- [ ] Extend lease implementation for directories
- [ ] Implement directory metadata caching