/**
 * 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);