public boolean isDirectory() { return fileInfo.isDirectory(); }
            // ... other attribute methods
        });
        
        return file;
    }
}
```

### 4.4 Directory Change Notifier
```java
package jcifs.internal.smb2.lease;

import jcifs.internal.smb2.ServerMessageBlock2;
import java.util.concurrent.ConcurrentHashMap;

public class DirectoryChangeNotifier {

    }
    
    public RdmaProvider getProvider() {
        return provider;
    }
    
    public RdmaConnection getConnection() {
        return rdmaConnection;
    }
}
```

### 4.4 RDMA Buffer Manager
```java
package jcifs.internal.smb2.rdma;

import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.atomic.AtomicLong;

public class RdmaBufferManager {

        SMBUtil.writeInt8(500000, buffer, 28); // Caller available units
        SMBUtil.writeInt8(600000, buffer, 36); // Actual available units
        SMBUtil.writeInt4(512, buffer, 44); // Sectors per unit
        SMBUtil.writeInt4(4096, buffer, 48); // Bytes per sector

        int result = response.readBytesWireFormat(buffer, bufferIndex);

        assertNotNull(response.getInfo());

            assertEquals(1024, SMBUtil.readInt4(buffer, 40)); // Remaining bytes

            // ReadChannelInfo
            assertEquals(0, SMBUtil.readInt2(buffer, 44)); // ReadChannelInfoOffset
            assertEquals(0, SMBUtil.readInt2(buffer, 46)); // ReadChannelInfoLength

            // Buffer byte
            assertEquals(0, buffer[48]); // One byte in buffer must be zero

        // 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 {
    private final DcerpcHandle handle;

        pos += 8;
        final int userOff = writeSecurityBuffer(type3, 36, userBytes);
        pos += 8;
        final int wsOff = writeSecurityBuffer(type3, 44, workstationBytes);
        pos += 8;
        final int skOff = writeSecurityBuffer(type3, 52, sessionKeyBytes);
        pos += 8;

        writeULong(type3, pos, getFlags());
        pos += 4;

        writeInt8(buffer, dataOffset + 12, 0);  // Reserved
        System.arraycopy(createGuid.toBytes(), 0, buffer, dataOffset + 20, 16);  // CreateGuid
    }
}
```

### 4.4 Durable Handle Reconnect Context
```java
package jcifs.internal.smb2.persistent;

public class DurableHandleReconnect extends Smb2CreateContext {
    public static final String NAME = "DHnC";  // Durable Handle Reconnect

            } catch (Exception e) {
                log.debug("Error closing channel", e);
            }
        }
        
        channels.clear();
    }
}
```

### 4.4 Channel Load Balancer
```java
package jcifs.internal.smb2.multichannel;

import java.util.*;
import java.util.concurrent.ThreadLocalRandom;

public class ChannelLoadBalancer {

            }
        } else {
            if (key != 0xFFFF) {
                return null;
            }
            final int cmd = this.sbuf[4 + 4];
            if (cmd == 0x24) {
                return new SmbComLockingAndX(getContext().getConfig());
            }
        }
        return null;
    }

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