* - Persistent storage for persistent handles
 * - Expiration tracking for durable handles
 * - Thread-safe access to handle information
 */
public class PersistentHandleManager {

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

    private final ConcurrentHashMap<String, HandleInfo> handles;
    private final ConcurrentHashMap<HandleGuid, HandleInfo> guidToHandle;

```java
// In SmbSession.java
private PersistentHandleManager handleManager;

public SmbSession(CIFSContext context, SmbTransport transport) {
    // ... existing initialization ...
    
    if (context.getConfig().isUseDurableHandles()) {
        this.handleManager = new PersistentHandleManager(context);
    }
}

public PersistentHandleManager getHandleManager() {
    return handleManager;
}

#### 2.1 Core Persistent Handle Infrastructure
```
Package: jcifs.internal.smb2.persistent
├── PersistentHandleContext.java     - Persistent handle create context
├── PersistentHandleManager.java     - Handle persistence management
├── DurableHandleRequest.java        - Durable handle v1 support
├── DurableHandleV2Request.java      - Durable handle v2 with timeout