import jcifs.CIFSContext;
import jcifs.Configuration;
import jcifs.smb.SmbFile;

/**
 * Manager for directory leases and caching
 */
public class DirectoryLeaseManager {

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

    private final CIFSContext context;
    private final LeaseManager baseLeaseManager;

        // Verify all cache entries exist
        assertNotNull(directoryLeaseManager.getCacheEntry(dir1));
        assertNotNull(directoryLeaseManager.getCacheEntry(dir2));
        assertNotNull(directoryLeaseManager.getCacheEntry(dir3));

        // Verify different scopes
        assertEquals(DirectoryCacheScope.IMMEDIATE_CHILDREN, directoryLeaseManager.getCacheEntry(dir1).getScope());

        baseLeaseManager = new LeaseManager(context);
        directoryLeaseManager = new DirectoryLeaseManager(context, baseLeaseManager);
    }

    @AfterEach
    public void tearDown() throws Exception {
        if (directoryLeaseManager != null) {
            directoryLeaseManager.shutdown();
        }
        if (baseLeaseManager != null) {
            baseLeaseManager.shutdown();

```java
// In SmbSession.java
private DirectoryLeaseManager directoryLeaseManager;

public void initializeDirectoryLeasing() {
    if (context.getConfig().isUseDirectoryLeasing() && supports(SMB3_0)) {
        directoryLeaseManager = new DirectoryLeaseManager(context, leaseManager);
    }
}

public DirectoryLeaseManager getDirectoryLeaseManager() {
    return directoryLeaseManager;
}

@Override

import java.util.List;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import jcifs.CIFSException;
import jcifs.internal.smb2.lease.DirectoryCacheScope;
import jcifs.internal.smb2.lease.DirectoryLeaseManager;
import jcifs.internal.smb2.lease.Smb2LeaseKey;
import jcifs.internal.smb2.lease.Smb2LeaseState;

/**
 * Extension methods for SmbFile to support directory leasing functionality.
 *

    private static final long BASE_RETRY_DELAY = 1000;
    private static final long MAX_RETRY_DELAY = 30000;
    private static final int MAX_BACKOFF_SHIFT = 3; // Maximum 8 seconds (2^3 * 1000ms)

    private final DirectoryLeaseManager leaseManager;
    private final ConcurrentHashMap<String, ChangeNotificationHandle> activeWatchers;
    private final ConcurrentHashMap<String, Integer> failureCounts;

    /**
     * Directory change types
     */