// Get a region and release it
        RdmaMemoryRegion region1 = bufferManager.getSendRegion(1024);
        bufferManager.releaseSendRegion(region1);

        // Get another region - should potentially reuse from pool
        RdmaMemoryRegion region2 = bufferManager.getSendRegion(1024);
        assertNotNull(region2);

        // Both regions should be valid

     * Release a send region back to the pool
     *
     * @param region memory region to release
     */
    public void releaseSendRegion(RdmaMemoryRegion region) {
        if (region.getSize() == sendBufferSize && availableSendRegions.size() < initialSendBuffers * 2) {
            availableSendRegions.offer(region);
        } else {
            region.close();
            totalReleased.incrementAndGet();
        }
    }

/**
 * TCP memory region implementation.
 *
 * For TCP fallback, memory regions are just wrappers around
 * ByteBuffers since no real RDMA registration is needed.
 */
public class TcpMemoryRegion extends RdmaMemoryRegion {

    private static final AtomicInteger keyGenerator = new AtomicInteger(1000);

    /**
     * Create new TCP memory region
     *
     * @param buffer memory buffer

 * RDMA memory access permissions for registered memory regions.
 * These flags control what operations can be performed on a memory region.
 */
public enum RdmaAccess {
    /**
     * Local read access to the memory region
     */
    LOCAL_READ,

    /**
     * Local write access to the memory region
     */
    LOCAL_WRITE,

    /**
     * Remote read access to the memory region
     */
    REMOTE_READ,

    /**

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    /** Access permissions for this memory region */
    protected final EnumSet<RdmaAccess> accessFlags;
    /** Local key for accessing this memory region */
    protected final int localKey;
    /** Remote key for remote RDMA access */
    protected final int remoteKey;
    /** Virtual address of the memory region */
    protected final long address;
    /** Flag indicating if the memory region is still valid */

import org.slf4j.LoggerFactory;

import jcifs.internal.smb2.rdma.RdmaAccess;
import jcifs.internal.smb2.rdma.RdmaMemoryRegion;

/**
 * DiSNI memory region implementation.
 *
 * This class would integrate with DiSNI to provide registered
 * memory regions for high-performance RDMA operations.
 *
 * Note: This is a skeleton implementation. A real implementation would

        // Assert: copied region equals the source slice.
        for (int i = 0; i < len; i++) {
            assertEquals(src[off + i], dst[dstIndex + i], "Byte mismatch at " + i);
        }

        // Assert: bytes before and after region remain unchanged.
        for (int i = 0; i < dstIndex; i++) {
            assertEquals((byte) 0x55, dst[i], "Unexpected change before copy region at " + i);
        }

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        RdmaMemoryRegion region = provider.registerMemory(buffer, access);
        assertNotNull(region, "Memory region should not be null");
        assertEquals(buffer, region.getBuffer(), "Buffer should match");
        assertEquals(1024, region.getSize(), "Size should match buffer size");
        assertTrue(region.hasAccess(RdmaAccess.LOCAL_READ), "Should have local read access");