// Verify all expected states are present
        assertNotNull(WitnessRegistration.WitnessRegistrationState.REGISTERING);
        assertNotNull(WitnessRegistration.WitnessRegistrationState.REGISTERED);
        assertNotNull(WitnessRegistration.WitnessRegistrationState.UNREGISTERING);
        assertNotNull(WitnessRegistration.WitnessRegistrationState.FAILED);

    checkArgument(
        !DEFAULTS.containsKey(type), "A default value was already registered for %s", type);
    checkArgument(
        implementations.put(type, implementation) == null,
        "Implementation for %s was already registered",
        type);
  }

  static {
    setImplementation(Appendable.class, StringBuilder.class);

        lenient().when(parent.getLocator()).thenReturn(locator);
        lenient().when(locator.getUNCPath()).thenReturn("\\\\SERVER\\Share\\dir\\"); // ends with \\

        // Create URL with registered handler
        URL smbUrl = new URL("smb://server/share/dir/");
        lenient().when(locator.getURL()).thenReturn(smbUrl);
    }

    // Helper: reflectively set private/protected field on an object

        ResourceHolder holder = new ResourceHolder(resourceId, resource, referenceQueue);

        activeResources.put(resourceId, holder);
        totalAllocated.incrementAndGet();

        log.trace("Registered resource: {} ({})", resourceId, resource.getClass().getSimpleName());

        return resourceId;
    }

    /**
     * Mark a resource as closed
     *
     * @param resourceId the resource ID

        if (component == null) {
            throw new IllegalStateException(
                    "Component '" + componentName + "' not found in crawler container. Please verify the component is registered.");
        }
        return (T) component;
    }

    /**
     * Wraps an object instance into a pooled object.
     *
     * @param obj The object to wrap

  /**
   * <a href="http://en.wikipedia.org/wiki/Embedded_OpenType">Embedded OpenType</a> fonts. This is
   * <a href="http://www.iana.org/assignments/media-types/application/vnd.ms-fontobject">registered
   * </a> with the IANA.
   *
   * @since 17.0
   */
  public static final MediaType EOT = createConstant(APPLICATION_TYPE, "vnd.ms-fontobject");

  /**

import java.util.concurrent.atomic.AtomicLong;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

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

   * one of the listener's callbacks will execute at once. However, multiple listeners' callbacks
   * may execute concurrently, and listeners may execute in an order different from the one in which
   * they were registered.
   *
   * <p>RuntimeExceptions thrown by a listener will be caught and logged. Any exception thrown
   * during {@code Executor.execute} (e.g., a {@code RejectedExecutionException}) will be caught and
   * logged.

  /**
   * Map generator that verifies that {@code setUp()} methods are called in all the test cases. The
   * {@code setUpRan} parameter is set true by the {@code setUp} that every test case is supposed to
   * have registered, and set false by the {@code tearDown}. We use a dynamic proxy to intercept all
   * of the {@code Map} method calls and check that {@code setUpRan} is true.
   */

     */
    public abstract void connect() throws IOException;

    /**
     * Send data using RDMA
     *
     * @param data data buffer to send
     * @param region registered memory region for the data
     * @throws IOException if send fails
     */
    public abstract void send(ByteBuffer data, RdmaMemoryRegion region) throws IOException;

    /**
     * Receive data using RDMA