```

### 4.3 Witness Client
```java
package jcifs.internal.witness;

import jcifs.dcerpc.*;
import jcifs.dcerpc.rpc.*;
import java.util.concurrent.*;

public class WitnessClient implements AutoCloseable {
    private final InetAddress witnessServer;
    private final int port;
    private final CIFSContext context;
    private final ConcurrentHashMap<String, WitnessRegistration> registrations;

/**
 * SMB Witness Protocol client implementation as defined in MS-SWN specification.
 * Manages witness registrations, notifications, and heartbeats for cluster failover support.
 */
public class WitnessClient implements AutoCloseable {
    private static final Logger log = LoggerFactory.getLogger(WitnessClient.class);

    // Polling and backoff constants (in ms)
    private static final long MAX_POLL_INTERVAL = 5000; // Normal polling: max 5 seconds

  }

  public void testAutoCloseable() throws Exception {
    AutoCloseable autoCloseable = closeable1::close;
    ClosingFuture<String> closingFuture =
        ClosingFuture.submit(
            new ClosingCallable<String>() {
              @Override
              public String call(DeferredCloser closer) throws Exception {
                closer.eventuallyClose(autoCloseable, closingExecutor);
                return "foo";
              }

        } finally {
            concurrentLimiter.close();
        }
    }

    @Test
    public void testAutoCloseableInterface() throws Exception {
        // Test that rate limiter implements AutoCloseable correctly
        try (AuthenticationRateLimiter autoLimiter = new AuthenticationRateLimiter()) {
            assertTrue(autoLimiter.checkAttempt("user", "192.168.1.13"));
        }

/**
 * Abstract base class for DCE/RPC communication handles.
 * This class provides the foundation for DCE/RPC client communication.
 */
public abstract class DcerpcHandle implements DcerpcConstants, AutoCloseable {

    /*
     * Bindings are in the form:
     * proto:\\server[key1=val1,key2=val2]
     * or
     * proto:server[key1=val1,key2=val2]
     * or
     * proto:[key1=val1,key2=val2]
     *

 * may also refer to servers and workgroups.
 *
 * @see jcifs.smb.SmbFile for the main implementation of this interface
 * @author mbechler
 */
public interface SmbResource extends AutoCloseable {

    /**
     * Gets the file locator for this file
     *
     * The file locator provides details about
     *
     * @return the fileLocator
     */
    SmbResourceLocator getLocator();

                    this.session.acquire();
                }
            }
        }
        return this;
    }

    /**
     * {@inheritDoc}
     *
     * @see java.lang.AutoCloseable#close()
     */
    @Override
    public void close() {
        release(false);
    }

    public void release() {
        release(true);
    }

    /**
     * @param track

 * - Automatic key cleanup on close
 * - Thread-safe key management
 * - Key derivation utilities
 * - Memory wiping capabilities
 */
public class SecureKeyManager implements AutoCloseable {

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

    private final Map<String, SecretKey> sessionKeys = new ConcurrentHashMap<>();

 * It implements rank fusion techniques to combine results from different search engines
 * and provides a unified search interface.
 */
public class RankFusionProcessor implements AutoCloseable {

    private static final Logger logger = LogManager.getLogger(RankFusionProcessor.class);

    /** Array of rank fusion searchers available for processing search requests */

 * Handles both AES-CCM (SMB 3.0/3.0.2) and AES-GCM (SMB 3.1.1) cipher suites.
 *
 * @author mbechler
 */
public class Smb2EncryptionContext implements AutoCloseable {

    private static final Logger log = LoggerFactory.getLogger(Smb2EncryptionContext.class);

    private final int cipherId;
    private final DialectVersion dialect;
    private byte[] encryptionKey;