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BufWriter

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tokio::io

结构体 BufWriter 

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pub struct BufWriter<W> { /* private fields */ }
展开描述

包装一个写入器并对其输出进行缓冲。

直接使用实现 AsyncWrite 的类型可能效率很低。 BufWriter 在内存中维护一个数据缓冲区，然后以少量但较大的批次写入到底层写入器。

BufWriter 可以提升对同一文件或网络套接字进行少量且重复写入调用的程序速度。 但它在一次性写入大量数据、只写一次或几次的情况下没有帮助。 对于写入到内存中的目标（如 Vec<u8>），它也不会带来任何优势。

当 BufWriter 被丢弃时，其缓冲区中的内容也会被丢弃。 在同一流上创建多个 BufWriter 实例可能会导致数据丢失。 如果需要将缓冲区内容写出，则必须在写入器被丢弃之前手动调用 flush。

实现§

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impl<W: AsyncWrite> BufWriter<W>

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pub fn new(inner: W) -> Self

使用默认缓冲区容量创建一个新的 BufWriter。当前默认为 8 KB，但未来可能会更改。

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

使用指定的缓冲区容量创建一个新的 BufWriter。

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pub fn get_ref(&self) -> &W

获取底层写入器的引用。

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

获取底层写入器的可变引用。

不建议直接写入到底层写入器。

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

获取底层写入器的固定可变引用。

不建议直接写入到底层写入器。

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pub fn into_inner(self) -> W

消耗此 BufWriter，返回底层的写入器。

请注意内部缓冲区中的任何剩余数据都将丢失。

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pub fn buffer(&self) -> &[u8] ⓘ

返回对内部缓冲数据的引用。

Trait 实现§

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

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

Attempts to return the contents of the internal buffer, filling it with more data from the inner reader if it is empty. 更多信息
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fn consume(self: Pin<&mut Self>, 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. 更多信息
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impl<W: AsyncWrite + AsyncRead> AsyncRead for BufWriter<W>

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

Attempts to read from the AsyncRead into buf. 更多信息
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impl<W: AsyncWrite + AsyncSeek> AsyncSeek for BufWriter<W>

在底层写入器中按字节偏移量定位。

定位前始终会先写出内部缓冲区的内容。

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fn start_seek(self: Pin<&mut Self>, pos: SeekFrom) -> Result<()>

Attempts to seek to an offset, in bytes, in a stream. 更多信息
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fn poll_complete( self: Pin<&mut Self>, cx: &mut Context<'_>, ) -> Poll<Result<u64>>

Waits for a seek operation to complete. 更多信息
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impl<W: AsyncWrite> AsyncWrite for BufWriter<W>

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

Attempt to write bytes from buf into the object. 更多信息
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fn poll_write_vectored( self: Pin<&mut Self>, cx: &mut Context<'_>, bufs: &[IoSlice<'_>], ) -> Poll<Result<usize>>

Like poll_write, except that it writes from a slice of buffers. 更多信息
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fn is_write_vectored(&self) -> bool

Determines if this writer has an efficient poll_write_vectored implementation. 更多信息
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fn poll_flush(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<()>>

Attempts to flush the object, ensuring that any buffered data reach their destination. 更多信息
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fn poll_shutdown(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<()>>

Initiates or attempts to shut down this writer, returning success when the I/O connection has completely shut down. 更多信息
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impl<W: Debug> Debug for BufWriter<W>

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

使用给定的格式化器格式化此值。 更多信息
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impl<RW> From<BufWriter<BufReader<RW>>> for BufStream<RW>

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

从输入类型转换为此类型。
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impl<'__pin, W> Unpin for BufWriter<W>
where PinnedFieldsOf<__Origin<'__pin, W>>: Unpin,

自动 Trait 实现§

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

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

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

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

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

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

Blanket 实现§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. 更多信息
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impl<R> AsyncBufReadExt for R
where R: AsyncBufRead + ?Sized,

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fn read_until<'a>( &'a mut self, byte: u8, buf: &'a mut Vec<u8>, ) -> ReadUntil<'a, Self>
where Self: Unpin,

Reads all bytes into buf until the delimiter byte or EOF is reached. 更多信息
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fn read_line<'a>(&'a mut self, buf: &'a mut String) -> ReadLine<'a, Self>
where Self: Unpin,

Reads all bytes until a newline (the 0xA byte) is reached, and append them to the provided buffer. 更多信息
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fn split(self, byte: u8) -> Split<Self>
where Self: Sized + Unpin,

Returns a stream of the contents of this reader split on the byte byte. 更多信息
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fn fill_buf(&mut self) -> FillBuf<'_, Self>
where Self: Unpin,

Returns the contents of the internal buffer, filling it with more data from the inner reader if it is empty. 更多信息
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fn consume(&mut self, amt: usize)
where Self: Unpin,

Tells this buffer that amt bytes have been consumed from the buffer, so they should no longer be returned in calls to read. 更多信息
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fn lines(self) -> Lines<Self>
where Self: Sized,

Returns a stream over the lines of this reader. This method is the async equivalent to BufRead::lines. 更多信息
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impl<R> AsyncReadExt for R
where R: AsyncRead + ?Sized,

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fn chain<R>(self, next: R) -> Chain<Self, R>
where Self: Sized, R: AsyncRead,

Creates a new AsyncRead instance that chains this stream with next. 更多信息
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fn read<'a>(&'a mut self, buf: &'a mut [u8]) -> Read<'a, Self>
where Self: Unpin,

Pulls some bytes from this source into the specified buffer, returning how many bytes were read. 更多信息
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fn read_buf<'a, B>(&'a mut self, buf: &'a mut B) -> ReadBuf<'a, Self, B>
where Self: Unpin, B: BufMut + ?Sized,

Pulls some bytes from this source into the specified buffer, advancing the buffer’s internal cursor. 更多信息
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fn read_exact<'a>(&'a mut self, buf: &'a mut [u8]) -> ReadExact<'a, Self>
where Self: Unpin,

Reads the exact number of bytes required to fill buf. 更多信息
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fn read_u8(&mut self) -> ReadU8<&mut Self>
where Self: Unpin,

Reads an unsigned 8 bit integer from the underlying reader. 更多信息
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fn read_i8(&mut self) -> ReadI8<&mut Self>
where Self: Unpin,

Reads a signed 8 bit integer from the underlying reader. 更多信息
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fn read_u16(&mut self) -> ReadU16<&mut Self>
where Self: Unpin,

Reads an unsigned 16-bit integer in big-endian order from the underlying reader. 更多信息
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fn read_i16(&mut self) -> ReadI16<&mut Self>
where Self: Unpin,

Reads a signed 16-bit integer in big-endian order from the underlying reader. 更多信息
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fn read_u32(&mut self) -> ReadU32<&mut Self>
where Self: Unpin,

Reads an unsigned 32-bit integer in big-endian order from the underlying reader. 更多信息
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fn read_i32(&mut self) -> ReadI32<&mut Self>
where Self: Unpin,

Reads a signed 32-bit integer in big-endian order from the underlying reader. 更多信息
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fn read_u64(&mut self) -> ReadU64<&mut Self>
where Self: Unpin,

Reads an unsigned 64-bit integer in big-endian order from the underlying reader. 更多信息
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fn read_i64(&mut self) -> ReadI64<&mut Self>
where Self: Unpin,

Reads an signed 64-bit integer in big-endian order from the underlying reader. 更多信息
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fn read_u128(&mut self) -> ReadU128<&mut Self>
where Self: Unpin,

Reads an unsigned 128-bit integer in big-endian order from the underlying reader. 更多信息
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fn read_i128(&mut self) -> ReadI128<&mut Self>
where Self: Unpin,

Reads an signed 128-bit integer in big-endian order from the underlying reader. 更多信息
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fn read_f32(&mut self) -> ReadF32<&mut Self>
where Self: Unpin,

Reads an 32-bit floating point type in big-endian order from the underlying reader. 更多信息
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fn read_f64(&mut self) -> ReadF64<&mut Self>
where Self: Unpin,

Reads an 64-bit floating point type in big-endian order from the underlying reader. 更多信息
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fn read_u16_le(&mut self) -> ReadU16Le<&mut Self>
where Self: Unpin,

Reads an unsigned 16-bit integer in little-endian order from the underlying reader. 更多信息
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fn read_i16_le(&mut self) -> ReadI16Le<&mut Self>
where Self: Unpin,

Reads a signed 16-bit integer in little-endian order from the underlying reader. 更多信息
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fn read_u32_le(&mut self) -> ReadU32Le<&mut Self>
where Self: Unpin,

Reads an unsigned 32-bit integer in little-endian order from the underlying reader. 更多信息
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fn read_i32_le(&mut self) -> ReadI32Le<&mut Self>
where Self: Unpin,

Reads a signed 32-bit integer in little-endian order from the underlying reader. 更多信息
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fn read_u64_le(&mut self) -> ReadU64Le<&mut Self>
where Self: Unpin,

Reads an unsigned 64-bit integer in little-endian order from the underlying reader. 更多信息
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fn read_i64_le(&mut self) -> ReadI64Le<&mut Self>
where Self: Unpin,

Reads an signed 64-bit integer in little-endian order from the underlying reader. 更多信息
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fn read_u128_le(&mut self) -> ReadU128Le<&mut Self>
where Self: Unpin,

Reads an unsigned 128-bit integer in little-endian order from the underlying reader. 更多信息
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fn read_i128_le(&mut self) -> ReadI128Le<&mut Self>
where Self: Unpin,

Reads an signed 128-bit integer in little-endian order from the underlying reader. 更多信息
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fn read_f32_le(&mut self) -> ReadF32Le<&mut Self>
where Self: Unpin,

Reads an 32-bit floating point type in little-endian order from the underlying reader. 更多信息
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fn read_f64_le(&mut self) -> ReadF64Le<&mut Self>
where Self: Unpin,

Reads an 64-bit floating point type in little-endian order from the underlying reader. 更多信息
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fn read_to_end<'a>(&'a mut self, buf: &'a mut Vec<u8>) -> ReadToEnd<'a, Self>
where Self: Unpin,

Reads all bytes until EOF in this source, placing them into buf. 更多信息
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fn read_to_string<'a>( &'a mut self, dst: &'a mut String, ) -> ReadToString<'a, Self>
where Self: Unpin,

Reads all bytes until EOF in this source, appending them to buf. 更多信息
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fn take(self, limit: u64) -> Take<Self>
where Self: Sized,

Creates an adaptor which reads at most limit bytes from it. 更多信息
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impl<S> AsyncSeekExt for S
where S: AsyncSeek + ?Sized,

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fn seek(&mut self, pos: SeekFrom) -> Seek<'_, Self>
where Self: Unpin,

Creates a future which will seek an IO object, and then yield the new position in the object and the object itself. 更多信息
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fn rewind(&mut self) -> Seek<'_, Self>
where Self: Unpin,

Creates a future which will rewind to the beginning of the stream. 更多信息
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fn stream_position(&mut self) -> Seek<'_, Self>
where Self: Unpin,

Creates a future which will return the current seek position from the start of the stream. 更多信息
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impl<W> AsyncWriteExt for W
where W: AsyncWrite + ?Sized,

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fn write<'a>(&'a mut self, src: &'a [u8]) -> Write<'a, Self>
where Self: Unpin,

Writes a buffer into this writer, returning how many bytes were written. 更多信息
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fn write_vectored<'a, 'b>( &'a mut self, bufs: &'a [IoSlice<'b>], ) -> WriteVectored<'a, 'b, Self>
where Self: Unpin,

Like write, except that it writes from a slice of buffers. 更多信息
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fn write_buf<'a, B>(&'a mut self, src: &'a mut B) -> WriteBuf<'a, Self, B>
where Self: Sized + Unpin, B: Buf,

Writes a buffer into this writer, advancing the buffer’s internal cursor. 更多信息
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fn write_all_buf<'a, B>( &'a mut self, src: &'a mut B, ) -> WriteAllBuf<'a, Self, B>
where Self: Sized + Unpin, B: Buf,

Attempts to write an entire buffer into this writer. 更多信息
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fn write_all<'a>(&'a mut self, src: &'a [u8]) -> WriteAll<'a, Self>
where Self: Unpin,

Attempts to write an entire buffer into this writer. 更多信息
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fn write_u8(&mut self, n: u8) -> WriteU8<&mut Self>
where Self: Unpin,

Writes an unsigned 8-bit integer to the underlying writer. 更多信息
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fn write_i8(&mut self, n: i8) -> WriteI8<&mut Self>
where Self: Unpin,

Writes a signed 8-bit integer to the underlying writer. 更多信息
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fn write_u16(&mut self, n: u16) -> WriteU16<&mut Self>
where Self: Unpin,

Writes an unsigned 16-bit integer in big-endian order to the underlying writer. 更多信息
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fn write_i16(&mut self, n: i16) -> WriteI16<&mut Self>
where Self: Unpin,

Writes a signed 16-bit integer in big-endian order to the underlying writer. 更多信息
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fn write_u32(&mut self, n: u32) -> WriteU32<&mut Self>
where Self: Unpin,

Writes an unsigned 32-bit integer in big-endian order to the underlying writer. 更多信息
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fn write_i32(&mut self, n: i32) -> WriteI32<&mut Self>
where Self: Unpin,

Writes a signed 32-bit integer in big-endian order to the underlying writer. 更多信息
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fn write_u64(&mut self, n: u64) -> WriteU64<&mut Self>
where Self: Unpin,

Writes an unsigned 64-bit integer in big-endian order to the underlying writer. 更多信息
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fn write_i64(&mut self, n: i64) -> WriteI64<&mut Self>
where Self: Unpin,

Writes an signed 64-bit integer in big-endian order to the underlying writer. 更多信息
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fn write_u128(&mut self, n: u128) -> WriteU128<&mut Self>
where Self: Unpin,

Writes an unsigned 128-bit integer in big-endian order to the underlying writer. 更多信息
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fn write_i128(&mut self, n: i128) -> WriteI128<&mut Self>
where Self: Unpin,

Writes an signed 128-bit integer in big-endian order to the underlying writer. 更多信息
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fn write_f32(&mut self, n: f32) -> WriteF32<&mut Self>
where Self: Unpin,

Writes an 32-bit floating point type in big-endian order to the underlying writer. 更多信息
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fn write_f64(&mut self, n: f64) -> WriteF64<&mut Self>
where Self: Unpin,

Writes an 64-bit floating point type in big-endian order to the underlying writer. 更多信息
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fn write_u16_le(&mut self, n: u16) -> WriteU16Le<&mut Self>
where Self: Unpin,

Writes an unsigned 16-bit integer in little-endian order to the underlying writer. 更多信息
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fn write_i16_le(&mut self, n: i16) -> WriteI16Le<&mut Self>
where Self: Unpin,

Writes a signed 16-bit integer in little-endian order to the underlying writer. 更多信息
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fn write_u32_le(&mut self, n: u32) -> WriteU32Le<&mut Self>
where Self: Unpin,

Writes an unsigned 32-bit integer in little-endian order to the underlying writer. 更多信息
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fn write_i32_le(&mut self, n: i32) -> WriteI32Le<&mut Self>
where Self: Unpin,

Writes a signed 32-bit integer in little-endian order to the underlying writer. 更多信息
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fn write_u64_le(&mut self, n: u64) -> WriteU64Le<&mut Self>
where Self: Unpin,

Writes an unsigned 64-bit integer in little-endian order to the underlying writer. 更多信息
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fn write_i64_le(&mut self, n: i64) -> WriteI64Le<&mut Self>
where Self: Unpin,

Writes an signed 64-bit integer in little-endian order to the underlying writer. 更多信息
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fn write_u128_le(&mut self, n: u128) -> WriteU128Le<&mut Self>
where Self: Unpin,

Writes an unsigned 128-bit integer in little-endian order to the underlying writer. 更多信息
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fn write_i128_le(&mut self, n: i128) -> WriteI128Le<&mut Self>
where Self: Unpin,

Writes an signed 128-bit integer in little-endian order to the underlying writer. 更多信息
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fn write_f32_le(&mut self, n: f32) -> WriteF32Le<&mut Self>
where Self: Unpin,

Writes an 32-bit floating point type in little-endian order to the underlying writer. 更多信息
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fn write_f64_le(&mut self, n: f64) -> WriteF64Le<&mut Self>
where Self: Unpin,

Writes an 64-bit floating point type in little-endian order to the underlying writer. 更多信息
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fn flush(&mut self) -> Flush<'_, Self>
where Self: Unpin,

Flushes this output stream, ensuring that all intermediately buffered contents reach their destination. 更多信息
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fn shutdown(&mut self) -> Shutdown<'_, Self>
where Self: Unpin,

Shuts down the output stream, ensuring that the value can be dropped cleanly. 更多信息
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. 更多信息
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. 更多信息
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impl<T> From<T> for T

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fn from(t: T) -> T

原样返回传入的参数。

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

调用 U::from(self)。

也就是说，此转换的具体行为取决于 From<T> for U 的实现方式。

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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

转换出错时返回的类型。
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

执行转换。
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

转换出错时返回的类型。
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

执行转换。