* @param remoteKey remote access key
     * @param length number of bytes to write
     * @return number of bytes written
     * @throws IOException if operation fails
     */
    public int rdmaWrite(ByteBuffer buffer, long remoteAddress, int remoteKey, int length) throws IOException {
        if (!isRdmaConnected()) {
            throw new IOException("RDMA connection not available");
        }

        try {

        // TCP fallback doesn't support real RDMA read
        throw new UnsupportedOperationException("RDMA read not supported by TCP fallback");
    }

    @Override
    public void rdmaWrite(RdmaMemoryRegion localRegion, long remoteAddress, int remoteKey, int length) throws IOException {
        // TCP fallback doesn't support real RDMA write

     * @param remoteAddress remote memory address
     * @param remoteKey remote memory key
     * @param length number of bytes to write
     * @throws IOException if write fails
     */
    public abstract void rdmaWrite(RdmaMemoryRegion localRegion, long remoteAddress, int remoteKey, int length) throws IOException;

    /**
     * Negotiate RDMA parameters
     *
     * @param request negotiation request parameters

    }
    
    public void recordRdmaWrite(int bytes) {
        rdmaWrites.incrementAndGet();
        bytesTransferred.addAndGet(bytes);
    }
    
    public void recordError() {
        operationErrors.incrementAndGet();
    }
    
    public double getErrorRate() {
        long total = rdmaReads.get() + rdmaWrites.get() + rdmaSends.get() + rdmaReceives.get();
        if (total == 0) return 0.0;

        } catch (Exception e) {
            state = RdmaConnectionState.ERROR;
            throw new IOException("DiSNI RDMA read failed", e);
        }
    }

    @Override
    public void rdmaWrite(RdmaMemoryRegion localRegion, long remoteAddress, int remoteKey, int length) throws IOException {
        if (state != RdmaConnectionState.ESTABLISHED) {
            throw new IOException("Connection not established");
        }

     * Creates a new RDMA statistics tracker
     */
    public RdmaStatistics() {
        // Default constructor
    }

    private final AtomicLong rdmaReads = new AtomicLong();
    private final AtomicLong rdmaWrites = new AtomicLong();
    private final AtomicLong rdmaSends = new AtomicLong();
    private final AtomicLong rdmaReceives = new AtomicLong();
    private final AtomicLong bytesTransferred = new AtomicLong();

 * by an RDMA provider implementation.
 */
public enum RdmaCapability {
    /**
     * Remote direct read operations
     */
    RDMA_READ,

    /**
     * Remote direct write operations
     */
    RDMA_WRITE,

    /**
     * Traditional send/receive with RDMA
     */
    RDMA_SEND_RECEIVE,

    /**
     * Dynamic memory registration
     */
    MEMORY_REGISTRATION,

    /**

        assertFalse(capabilities.contains(RdmaCapability.RDMA_READ), "Should not support RDMA read");
        assertFalse(capabilities.contains(RdmaCapability.RDMA_WRITE), "Should not support RDMA write");
    }

    @Test
    public void testCreateConnection() throws Exception {
        InetSocketAddress remote = new InetSocketAddress("localhost", 445);