Struct hyper_static_server::tokio::io::BufWriter

pub struct BufWriter<W> { /* fields omitted */ }

Wraps a writer and buffers its output.

It can be excessively inefficient to work directly with something that implements AsyncWrite. A BufWriter keeps an in-memory buffer of data and writes it to an underlying writer in large, infrequent batches.

BufWriter can improve the speed of programs that make small and repeated write calls to the same file or network socket. It does not help when writing very large amounts at once, or writing just one or a few times. It also provides no advantage when writing to a destination that is in memory, like a Vec<u8>.

When the BufWriter is dropped, the contents of its buffer will be discarded. Creating multiple instances of a BufWriter on the same stream can cause data loss. If you need to write out the contents of its buffer, you must manually call flush before the writer is dropped.

Implementations

impl<W> BufWriter<W> where
    W: AsyncWrite, 

pub fn new(inner: W) -> BufWriter<W>

Creates a new BufWriter with a default buffer capacity. The default is currently 8 KB, but may change in the future.

pub fn with_capacity(cap: usize, inner: W) -> BufWriter<W>

Creates a new BufWriter with the specified buffer capacity.

pub fn get_ref(&self) -> &W

Gets a reference to the underlying writer.

pub fn get_mut(&mut self) -> &mut W

Gets a mutable reference to the underlying writer.

It is inadvisable to directly write to the underlying writer.

pub fn get_pin_mut(self: Pin<&mut BufWriter<W>>) -> Pin<&mut W>

Gets a pinned mutable reference to the underlying writer.

It is inadvisable to directly write to the underlying writer.

pub fn into_inner(self) -> W

Consumes this BufWriter, returning the underlying writer.

Note that any leftover data in the internal buffer is lost.

pub fn buffer(&self) -> &[u8]

Returns a reference to the internally buffered data.

Trait Implementations

impl<W> AsyncBufRead for BufWriter<W> where
    W: AsyncBufRead + AsyncWrite, 

pub fn poll_fill_buf(
    self: Pin<&mut BufWriter<W>>,
    cx: &mut Context<'_>
) -> Poll<Result<&[u8], Error>>

Attempts to return the contents of the internal buffer, filling it with more data from the inner reader if it is empty.

pub fn consume(self: Pin<&mut BufWriter<W>>, amt: usize)

Tells this buffer that amt bytes have been consumed from the buffer, so they should no longer be returned in calls to poll_read.

impl<W> AsyncRead for BufWriter<W> where
    W: AsyncRead + AsyncWrite, 

pub fn poll_read(
    self: Pin<&mut BufWriter<W>>,
    cx: &mut Context<'_>,
    buf: &mut ReadBuf<'_>
) -> Poll<Result<(), Error>>

Attempts to read from the AsyncRead into buf.

impl<W> AsyncWrite for BufWriter<W> where
    W: AsyncWrite, 

pub fn poll_write(
    self: Pin<&mut BufWriter<W>>,
    cx: &mut Context<'_>,
    buf: &[u8]
) -> Poll<Result<usize, Error>>

Attempt to write bytes from buf into the object.

pub fn poll_flush(
    self: Pin<&mut BufWriter<W>>,
    cx: &mut Context<'_>
) -> Poll<Result<(), Error>>

Attempts to flush the object, ensuring that any buffered data reach their destination.

pub fn poll_shutdown(
    self: Pin<&mut BufWriter<W>>,
    cx: &mut Context<'_>
) -> Poll<Result<(), Error>>

Initiates or attempts to shut down this writer, returning success when the I/O connection has completely shut down.

pub fn poll_write_vectored(
    self: Pin<&mut Self>,
    cx: &mut Context<'_>,
    bufs: &[IoSlice<'_>]
) -> Poll<Result<usize, Error>>

Like poll_write, except that it writes from a slice of buffers.

pub fn is_write_vectored(&self) -> bool

Determines if this writer has an efficient poll_write_vectored implementation.

impl<W> Debug for BufWriter<W> where
    W: Debug, 

pub fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl<RW> From<BufWriter<BufReader<RW>>> for BufStream<RW>

pub fn from(b: BufWriter<BufReader<RW>>) -> BufStream<RW>

Performs the conversion.

impl<'__pin, W> Unpin for BufWriter<W> where
    __Origin<'__pin, W>: Unpin,