// Shutdown scheduler
        scheduler.shutdown();
        
        // Close RPC client
        if (rpcClient != null) {
            rpcClient.close();
        }
    }
}
```

### 4.4 Witness RPC Client
```java
package jcifs.internal.witness;

import jcifs.dcerpc.*;
import jcifs.dcerpc.rpc.*;

public class WitnessRpcClient implements AutoCloseable {

	"cmd/internal/obj/wasm"
	"cmd/internal/obj/x86"
	"fmt"
	"strings"
)

// Pseudo-registers whose names are the constant name without the leading R.
const (
	RFP = -(iota + 1)
	RSB
	RSP
	RPC
)

// Arch wraps the link architecture object with more architecture-specific information.
type Arch struct {
	*obj.LinkArch
	// Map of instruction names to enumeration.
	Instructions map[string]obj.As

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package jcifs.smb1.dcerpc;

/**
 * DCE/RPC protocol constants for SMB1 compatibility
 */
public interface DcerpcConstants {

    /**
     * NDR syntax UUID for DCE/RPC protocol
     */
    UUID DCERPC_UUID_SYNTAX_NDR = new UUID("8a885d04-1ceb-11c9-9fe8-08002b104860");

    /**

import jcifs.smb1.dcerpc.ndr.NdrException;
import jcifs.smb1.dcerpc.ndr.NdrObject;

/**
 * Server Service RPC interface implementation for remote server administration (SMB1).
 */
public class srvsvc {

    /**
     * Private constructor to prevent instantiation.
     */
    private srvsvc() {
    }

    /**
     * Gets the RPC interface syntax string.
     * @return the interface UUID and version
     */

    // Output parameters for WitnessRegister
    private byte[] contextHandle;

    /**
     * Creates a new WitnessRegister RPC message.
     */
    public WitnessRegisterMessage() {
        super(WITNESS_REGISTER);
        this.contextHandle = new byte[20]; // Standard DCE/RPC context handle size
    }

    /**
     * Sets the witness protocol version.
     *
     * @param version the witness protocol version

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 */

package jcifs.smb1.dcerpc.msrpc;

import jcifs.smb1.dcerpc.rpc;

/**
 * MS-RPC SAMR close handle operation.
 *
 * This class implements the SAMR CloseHandle operation for releasing
 * Security Account Manager (SAM) handles.
 */
public class MsrpcSamrCloseHandle extends samr.SamrCloseHandle {

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package jcifs.dcerpc.msrpc;

import jcifs.dcerpc.rpc;

/**
 * MSRPC implementation for opening a domain handle.
 * This class provides functionality to open a handle to a SAM domain
 * using the SAMR RPC interface.
 */
public class MsrpcSamrOpenDomain extends samr.SamrOpenDomain {

    /**
     * Creates a new request to open a domain handle.

 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
package jcifs.dcerpc.msrpc;

import jcifs.dcerpc.rpc.policy_handle;

/**
 * Microsoft RPC SAM close handle request.
 * This class implements the SAMR close handle operation.
 *
 * @author mbechler
 */
public class MsrpcSamrCloseHandle extends samr.SamrCloseHandle {

    /**

    void testConstructorInitialization() {
        // Verify level is set to 200 for DFS root enumeration
        assertEquals(200, dfsRootEnum.level);

        // Verify DCE/RPC message properties
        assertEquals(0, dfsRootEnum.getPtype());
        assertEquals(DcerpcConstants.DCERPC_FIRST_FRAG | DcerpcConstants.DCERPC_LAST_FRAG, dfsRootEnum.getFlags());

        // Verify DFS enumeration structure

    }

    /**
     * Constructs a SID from an RPC sid_t structure.
     *
     * @param sid the RPC sid_t structure
     * @param type the SID type
     * @param domainName the domain name for this SID
     * @param acctName the account name for this SID
     * @param decrementAuthority whether to decrement the authority count
     */