*
     * Changes in between these calls (as long as the file is open) are buffered by the server, so iteratively calling
     * this method should provide all changes (size of that buffer can be adjusted through
     * {@link jcifs.Configuration#getNotifyBufferSize()}).
     * If the server cannot fulfill the request because the changes did not fit the buffer
     * it will return an empty list of changes.
     *

     */
    @Override
    protected int readBytesWireFormat(final byte[] buffer, int bufferIndex) throws SMBProtocolDecodingException {
        final int start = bufferIndex;
        final int structureSize = SMBUtil.readInt2(buffer, bufferIndex);
        if (structureSize != 4) {
            throw new SMBProtocolDecodingException("Expected structureSize = 4");
        }

import jcifs.internal.smb2.ServerMessageBlock2Request;
import jcifs.internal.smb2.Smb2Constants;
import jcifs.internal.util.SMBUtil;

/**
 * SMB2 Flush request message.
 *
 * This command is used to flush buffered data to the
 * underlying storage device for a given file handle.
 *
 * @author mbechler
 */
public class Smb2FlushRequest extends ServerMessageBlock2Request<Smb2FlushResponse> implements RequestWithFileId {

    void availableReturnsUnderlyingWhenNoMessage() throws IOException {
        // Mock input stream that reports available bytes
        InputStream mockIn = mock(InputStream.class);
        when(mockIn.available()).thenReturn(42);

        SocketInputStream sis = new SocketInputStream(mockIn);

        // When no message is buffered, should return underlying stream's available

    public static final int FILE_WRITE_THROUGH = 0x2;
    /**
     * Access to the file is sequential only
     */
    public static final int FILE_SEQUENTIAL_ONLY = 0x4;
    /**
     * File cannot be cached or buffered at intermediate levels
     */
    public static final int FILE_NO_IMTERMEDIATE_BUFFERING = 0x8;
    /**
     * All operations on the file are performed synchronously with alerts
     */

        WeakReference<SmbFile> ref = fileCache.get(path);
        if (ref != null) {
            SmbFile file = ref.get();
            if (file != null) {
                try {
                    // Force flush any buffered writes
                    // This would typically call file's internal flush method
                    // For now, we log the action as the actual implementation

Here we `POST` a request body as a stream. The content of this request body is being generated as it's being written. This example streams directly into the [Okio](https://github.com/square/okio) buffered sink. Your programs may prefer an `OutputStream`, which you can get from `BufferedSink.outputStream()`.

=== ":material-language-kotlin: Kotlin"
    ```kotlin
      private val client = OkHttpClient()

  /** Number of (unsynchronized) retries in the containsValue method. */
  static final int CONTAINS_VALUE_RETRIES = 3;

  /**
   * Number of cache access operations that can be buffered per segment before the cache's recency
   * ordering information is updated. This is used to avoid lock contention by recording a memento

            assertNotNull(buffer, "Buffer should not be null even when cache is full");
            assertEquals(SmbComTransaction.TRANSACTION_BUF_SIZE, buffer.length, "Buffer should have correct size");
            buffers.add(buffer);
        }

        // When - Release all buffers back
        for (byte[] buffer : buffers) {
            BufferCache.releaseBuffer(buffer);
        }

        fileInternalInfo.decode(buffer2, 0, buffer2.length);
        assertEquals(indexNumber2, fileInternalInfo.getIndexNumber());

        // Third decode - should overwrite again
        byte[] buffer3 = new byte[8];
        long indexNumber3 = 0x3333333333333333L;
        SMBUtil.writeInt8(indexNumber3, buffer3, 0);
        fileInternalInfo.decode(buffer3, 0, buffer3.length);