* Manages connection state, credit flow control, and provides
 * abstract methods for RDMA operations that must be implemented
 * by specific provider implementations.
 */
public abstract class RdmaConnection implements AutoCloseable {

    /**
     * RDMA connection state enumeration
     */
    public enum RdmaConnectionState {
        /** Connection is not established */
        DISCONNECTED,

        // Configure with shorter intervals for testing
        resourceManager.configure(1000, 100, true, true);
    }

    /**
     * Test resource for tracking
     */
    static class TestResource implements AutoCloseable {
        private final AtomicBoolean closed = new AtomicBoolean(false);
        private final String name;

        TestResource(String name) {
            this.name = name;
        }

        @Override

            assertNull(smbPipeHandle.unwrap(SmbPipeHandle.class), "Unwrap should return null for an unsupported type.");
        }
    }

    /**
     * Tests the contract for {@link AutoCloseable}.
     */
    @Nested
    public class AutoCloseableContractTest {

        /**
         * Verifies that the handle is automatically closed in a try-with-resources statement.

     * its parameter type is {@code Object}, not {@code AutoCloseable} or {@code Closeable}.
     *
     * @param closeable the object to be closed (see notes above)
     * @param closingExecutor the object will be closed on this executor
     * @return the first argument
     */
    @CanIgnoreReturnValue
    @ParametricNullness
    public <C extends @Nullable Object & @Nullable AutoCloseable> C eventuallyClose(

- **Authentication**: NTLM, Kerberos, SPNEGO unified subsystem
- **SLF4J Logging**: Comprehensive logging throughout the codebase
- **Resource Management**: AutoCloseable patterns for file handles and connections
- **Thread Safety**: Components support concurrent access
- **DFS Support**: Distributed File System resolution
- **Streaming Operations**: Efficient directory listings and file operations

/**
 * Unit tests for RDMA buffer manager
 */
public class RdmaBufferManagerTest {

    @Mock
    private RdmaProvider mockProvider;

    private RdmaBufferManager bufferManager;
    private AutoCloseable mocks;

    @BeforeEach
    public void setUp() throws Exception {
        mocks = MockitoAnnotations.openMocks(this);

        // Set up mock provider to return TCP memory regions

/**
 * Mock witness service for integration testing.
 * Simulates a basic witness service that can accept registrations
 * and send notifications.
 */
public class MockWitnessService implements AutoCloseable {
    private static final Logger log = LoggerFactory.getLogger(MockWitnessService.class);

    private ServerSocket serverSocket;
    private final AtomicBoolean running = new AtomicBoolean(false);

    GcFinalization.awaitDone(finalizeReferentRan::get);
    assertThat(serverSocket.isClosed()).isTrue();
  }

  @SuppressWarnings("Java8ApiChecker")
  static class MyServerExampleWithCleaner implements AutoCloseable {
    private static final Cleaner cleaner = Cleaner.create();

    private static Runnable closeServerSocketRunnable(
        ServerSocket serverSocket, AtomicBoolean cleanerRan) {
      return () -> {

    GcFinalization.awaitDone(finalizeReferentRan::get);
    assertThat(serverSocket.isClosed()).isTrue();
  }

  @SuppressWarnings("Java8ApiChecker")
  static class MyServerExampleWithCleaner implements AutoCloseable {
    private static final Cleaner cleaner = Cleaner.create();

    private static Runnable closeServerSocketRunnable(
        ServerSocket serverSocket, AtomicBoolean cleanerRan) {
      return () -> {

 *
 * Manages pools of pre-registered memory regions to avoid the overhead
 * of frequent registration/deregistration during RDMA operations.
 */
public class RdmaBufferManager implements AutoCloseable {

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

    private final RdmaProvider provider;
    private final ConcurrentLinkedQueue<RdmaMemoryRegion> availableSendRegions;