Struct actix_codec::Framed

pub struct Framed<T, U> { /* fields omitted */ }

A unified Stream and Sink interface to an underlying I/O object, using the Encoder and Decoder traits to encode and decode frames.

You can create a Framed instance by using the AsyncRead::framed adapter.

Methods

impl<T, U> Framed<T, U> where
    T: AsyncRead + AsyncWrite,
    U: Decoder + Encoder, 

pub fn new(io: T, codec: U) -> Framed<T, U>

Provides a Stream and Sink interface for reading and writing to this Io object, using Decode and Encode to read and write the raw data.

Raw I/O objects work with byte sequences, but higher-level code usually wants to batch these into meaningful chunks, called "frames". This method layers framing on top of an I/O object, by using the Codec traits to handle encoding and decoding of messages frames. Note that the incoming and outgoing frame types may be distinct.

This function returns a single object that is both Stream and Sink; grouping this into a single object is often useful for layering things like gzip or TLS, which require both read and write access to the underlying object.

If you want to work more directly with the streams and sink, consider calling split on the Framed returned by this method, which will break them into separate objects, allowing them to interact more easily.

pub fn new_with_caps(io: T, codec: U, lw: usize, hw: usize) -> Framed<T, U>

Same as Framed::new() with ability to specify write buffer low/high capacity watermarks.

impl<T, U> Framed<T, U>

pub fn from_parts(parts: FramedParts<T, U>) -> Framed<T, U>

Provides a Stream and Sink interface for reading and writing to this Io object, using Decode and Encode to read and write the raw data.

Raw I/O objects work with byte sequences, but higher-level code usually wants to batch these into meaningful chunks, called "frames". This method layers framing on top of an I/O object, by using the Codec traits to handle encoding and decoding of messages frames. Note that the incoming and outgoing frame types may be distinct.

This function returns a single object that is both Stream and Sink; grouping this into a single object is often useful for layering things like gzip or TLS, which require both read and write access to the underlying object.

This objects takes a stream and a readbuffer and a writebuffer. These field can be obtained from an existing Framed with the into_parts method.

If you want to work more directly with the streams and sink, consider calling split on the Framed returned by this method, which will break them into separate objects, allowing them to interact more easily.

pub fn get_codec(&self) -> &U

Returns a reference to the underlying codec.

pub fn get_codec_mut(&mut self) -> &mut U

Returns a mutable reference to the underlying codec.

pub fn get_ref(&self) -> &T

Returns a reference to the underlying I/O stream wrapped by Frame.

Note that care should be taken to not tamper with the underlying stream of data coming in as it may corrupt the stream of frames otherwise being worked with.

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

Returns a mutable reference to the underlying I/O stream wrapped by Frame.

Note that care should be taken to not tamper with the underlying stream of data coming in as it may corrupt the stream of frames otherwise being worked with.

pub fn is_write_buf_empty(&self) -> bool

Check if write buffer is empty.

pub fn is_write_buf_full(&self) -> bool

Check if write buffer is full.

pub fn into_inner(self) -> T

Consumes the Frame, returning its underlying I/O stream.

Note that care should be taken to not tamper with the underlying stream of data coming in as it may corrupt the stream of frames otherwise being worked with.

pub fn into_framed<U2>(self, codec: U2) -> Framed<T, U2>

Consume the Frame, returning Frame with different codec.

pub fn map_io<F, T2>(self, f: F) -> Framed<T2, U> where
    F: Fn(T) -> T2, 

Consume the Frame, returning Frame with different io.

pub fn map_codec<F, U2>(self, f: F) -> Framed<T, U2> where
    F: Fn(U) -> U2, 

Consume the Frame, returning Frame with different codec.

pub fn into_parts(self) -> FramedParts<T, U>

Consumes the Frame, returning its underlying I/O stream, the buffer with unprocessed data, and the codec.

Note that care should be taken to not tamper with the underlying stream of data coming in as it may corrupt the stream of frames otherwise being worked with.

impl<T, U> Framed<T, U>

pub fn write(
    &mut self,
    item: <U as Encoder>::Item
) -> Result<(), <U as Encoder>::Error> where
    T: AsyncWrite,
    U: Encoder, 

Serialize item and Write to the inner buffer

pub fn is_ready(&self) -> bool

pub fn next_item(
    &mut self,
    cx: &mut Context
) -> Poll<Option<Result<U::Item, U::Error>>> where
    T: AsyncRead,
    U: Decoder, 

pub fn flush(&mut self, cx: &mut Context) -> Poll<Result<(), U::Error>> where
    T: AsyncWrite,
    U: Encoder, 

pub fn close(&mut self, cx: &mut Context) -> Poll<Result<(), U::Error>> where
    T: AsyncWrite,
    U: Encoder, 

Trait Implementations

impl<'pin, T, U> Unpin for Framed<T, U> where
    __Framed<'pin, T, U>: Unpin, 

impl<T, U> Debug for Framed<T, U> where
    T: Debug,
    U: Debug, 

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

Formats the value using the given formatter.

impl<T, U> Sink<<U as Encoder>::Item> for Framed<T, U> where
    T: AsyncWrite,
    U: Encoder,
    U::Error: From<Error>, 

type Error = U::Error

The type of value produced by the sink when an error occurs.

fn poll_ready(
    self: Pin<&mut Self>,
    _: &mut Context
) -> Poll<Result<(), Self::Error>>

Attempts to prepare the Sink to receive a value.

fn start_send(
    self: Pin<&mut Self>,
    item: <U as Encoder>::Item
) -> Result<(), Self::Error>

Begin the process of sending a value to the sink. Each call to this function must be preceded by a successful call to poll_ready which returned Poll::Ready(Ok(())).

fn poll_flush(
    self: Pin<&mut Self>,
    cx: &mut Context
) -> Poll<Result<(), Self::Error>>

Flush any remaining output from this sink.

fn poll_close(
    self: Pin<&mut Self>,
    cx: &mut Context
) -> Poll<Result<(), Self::Error>>

Flush any remaining output and close this sink, if necessary.

impl<T, U> Stream for Framed<T, U> where
    T: AsyncRead,
    U: Decoder, 

type Item = Result<U::Item, U::Error>

Values yielded by the stream.

fn poll_next(self: Pin<&mut Self>, cx: &mut Context) -> Poll<Option<Self::Item>>

Attempt to pull out the next value of this stream, registering the current task for wakeup if the value is not yet available, and returning None if the stream is exhausted.

fn size_hint(&self) -> (usize, Option<usize>)

Returns the bounds on the remaining length of the stream.