Struct tokio_serde_json::WriteJson

pub struct WriteJson<T: Sink, U> { /* fields omitted */ }

Adapts a buffer sink to a value sink by serializing the values as JSON.

WriteJson implements Sink by serializing the submitted values to a buffer. The buffer is then sent to the inner stream, which is responsible for handling framing on the wire.

If a WriteJson is used concurrently from two or more threads, it is guaranteed that the bytes of different objects written will not be interleaved. In other words, if two calls to WriteJson::send overlap, then the bytes of one object will be written entirely before the bytes of the other.

Methods

impl<T, U> WriteJson<T, U> where     T: Sink<SinkItem = Bytes>,     T::SinkError: From<Error>,     U: Serialize,

pub fn new(inner: T) -> WriteJson<T, U>

Creates a new WriteJson with the given buffer sink.

impl<T: Sink, U> WriteJson<T, U>

pub fn get_ref(&self) -> &T

Returns a reference to the underlying sink wrapped by WriteJson.

Note that care should be taken to not tamper with the underlying sink as it may corrupt the sequence of frames otherwise being worked with.

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

Returns a mutable reference to the underlying sink wrapped by WriteJson.

Note that care should be taken to not tamper with the underlying sink as it may corrupt the sequence of frames otherwise being worked with.

pub fn into_inner(self) -> T

Consumes the WriteJson, returning its underlying sink.

Note that care should be taken to not tamper with the underlying sink as it may corrupt the sequence of frames otherwise being worked with.

Trait Implementations

impl<T, U> Sink for WriteJson<T, U> where     T: Sink<SinkItem = Bytes>,     T::SinkError: From<Error>,     U: Serialize,

type SinkItem = U

The type of value that the sink accepts.

type SinkError = T::SinkError

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

fn start_send(&mut self, item: U) -> StartSend<U, T::SinkError>

Begin the process of sending a value to the sink.

fn poll_complete(&mut self) -> Poll<(), T::SinkError>

Flush all output from this sink, if necessary.

fn close(&mut self) -> Poll<(), T::SinkError>

A method to indicate that no more values will ever be pushed into this sink.

fn wait(self) -> Wait<Self>

Creates a new object which will produce a synchronous sink.

fn with<U, F, Fut>(self, f: F) -> With<Self, U, F, Fut> where     F: FnMut(U) -> Fut,     Fut: IntoFuture<Item = Self::SinkItem>,     <Fut as IntoFuture>::Error: From<Self::SinkError>,

Composes a function in front of the sink.

fn with_flat_map<U, F, St>(self, f: F) -> WithFlatMap<Self, U, F, St> where     F: FnMut(U) -> St,     St: Stream<Item = Self::SinkItem, Error = Self::SinkError>,

Composes a function in front of the sink.

fn sink_map_err<F, E>(self, f: F) -> SinkMapErr<Self, F> where     F: FnOnce(Self::SinkError) -> E,

Transforms the error returned by the sink.

fn sink_from_err<E>(self) -> SinkFromErr<Self, E> where     E: From<Self::SinkError>,

Map this sink's error to any error implementing From for this sink's Error, returning a new sink.

fn buffer(self, amt: usize) -> Buffer<Self>

Adds a fixed-size buffer to the current sink.

fn fanout<S>(self, other: S) -> Fanout<Self, S> where     S: Sink<SinkItem = Self::SinkItem, SinkError = Self::SinkError>,     Self::SinkItem: Clone,

Fanout items to multiple sinks.

fn flush(self) -> Flush<Self>

A future that completes when the sink has finished processing all pending requests.

fn send(self, item: Self::SinkItem) -> Send<Self>

A future that completes after the given item has been fully processed into the sink, including flushing.

fn send_all<S>(self, stream: S) -> SendAll<Self, S> where     S: Stream<Item = Self::SinkItem>,     Self::SinkError: From<<S as Stream>::Error>,

A future that completes after the given stream has been fully processed into the sink, including flushing.

impl<T, U> Stream for WriteJson<T, U> where     T: Stream + Sink,

type Item = T::Item

The type of item this stream will yield on success.

type Error = T::Error

The type of error this stream may generate.

fn poll(&mut self) -> Poll<Option<T::Item>, T::Error>

Attempt to pull out the next value of this stream, returning None if the stream is finished.

fn wait(self) -> Wait<Self>

Creates an iterator which blocks the current thread until each item of this stream is resolved.

fn into_future(self) -> StreamFuture<Self>

Converts this stream into a Future.

fn map<U, F>(self, f: F) -> Map<Self, F> where     F: FnMut(Self::Item) -> U,

Converts a stream of type T to a stream of type U.

fn map_err<U, F>(self, f: F) -> MapErr<Self, F> where     F: FnMut(Self::Error) -> U,

Converts a stream of error type T to a stream of error type U.

fn filter<F>(self, f: F) -> Filter<Self, F> where     F: FnMut(&Self::Item) -> bool,

Filters the values produced by this stream according to the provided predicate.

fn filter_map<F, B>(self, f: F) -> FilterMap<Self, F> where     F: FnMut(Self::Item) -> Option<B>,

Filters the values produced by this stream while simultaneously mapping them to a different type.

fn then<F, U>(self, f: F) -> Then<Self, F, U> where     F: FnMut(Result<Self::Item, Self::Error>) -> U,     U: IntoFuture,

Chain on a computation for when a value is ready, passing the resulting item to the provided closure f.

fn and_then<F, U>(self, f: F) -> AndThen<Self, F, U> where     F: FnMut(Self::Item) -> U,     U: IntoFuture<Error = Self::Error>,

Chain on a computation for when a value is ready, passing the successful results to the provided closure f.

fn or_else<F, U>(self, f: F) -> OrElse<Self, F, U> where     F: FnMut(Self::Error) -> U,     U: IntoFuture<Item = Self::Item>,

Chain on a computation for when an error happens, passing the erroneous result to the provided closure f.

fn collect(self) -> Collect<Self>

Collect all of the values of this stream into a vector, returning a future representing the result of that computation.

fn concat2(self) -> Concat2<Self> where     Self::Item: Extend<<Self::Item as IntoIterator>::Item>,     Self::Item: IntoIterator,     Self::Item: Default,

Concatenate all results of a stream into a single extendable destination, returning a future representing the end result.

fn concat(self) -> Concat<Self> where     Self::Item: Extend<<Self::Item as IntoIterator>::Item>,     Self::Item: IntoIterator,

Deprecated since 0.1.14

: please use Stream::concat2 instead

Concatenate all results of a stream into a single extendable destination, returning a future representing the end result.

fn fold<F, T, Fut>(self, init: T, f: F) -> Fold<Self, F, Fut, T> where     F: FnMut(T, Self::Item) -> Fut,     Fut: IntoFuture<Item = T>,     Self::Error: From<<Fut as IntoFuture>::Error>,

Execute an accumulating computation over a stream, collecting all the values into one final result.

fn flatten(self) -> Flatten<Self> where     Self::Item: Stream,     <Self::Item as Stream>::Error: From<Self::Error>,

Flattens a stream of streams into just one continuous stream.

fn skip_while<P, R>(self, pred: P) -> SkipWhile<Self, P, R> where     P: FnMut(&Self::Item) -> R,     R: IntoFuture<Item = bool, Error = Self::Error>,

Skip elements on this stream while the predicate provided resolves to true.

fn take_while<P, R>(self, pred: P) -> TakeWhile<Self, P, R> where     P: FnMut(&Self::Item) -> R,     R: IntoFuture<Item = bool, Error = Self::Error>,

Take elements from this stream while the predicate provided resolves to true.

fn for_each<F, U>(self, f: F) -> ForEach<Self, F, U> where     F: FnMut(Self::Item) -> U,     U: IntoFuture<Item = (), Error = Self::Error>,

Runs this stream to completion, executing the provided closure for each element on the stream.

fn from_err<E>(self) -> FromErr<Self, E> where     E: From<Self::Error>,

Map this stream's error to any error implementing From for this stream's Error, returning a new stream.

fn take(self, amt: u64) -> Take<Self>

Creates a new stream of at most amt items of the underlying stream.

fn skip(self, amt: u64) -> Skip<Self>

Creates a new stream which skips amt items of the underlying stream.

fn fuse(self) -> Fuse<Self>

Fuse a stream such that poll will never again be called once it has finished.

fn by_ref(&mut self) -> &mut Self

Borrows a stream, rather than consuming it.

fn catch_unwind(self) -> CatchUnwind<Self> where     Self: UnwindSafe,

Catches unwinding panics while polling the stream.

fn buffered(self, amt: usize) -> Buffered<Self> where     Self::Item: IntoFuture,     <Self::Item as IntoFuture>::Error == Self::Error,

An adaptor for creating a buffered list of pending futures.

fn buffer_unordered(self, amt: usize) -> BufferUnordered<Self> where     Self::Item: IntoFuture,     <Self::Item as IntoFuture>::Error == Self::Error,

An adaptor for creating a buffered list of pending futures (unordered).

fn merge<S>(self, other: S) -> Merge<Self, S> where     S: Stream<Error = Self::Error>,

Deprecated

: functionality provided by select now

An adapter for merging the output of two streams.

fn zip<S>(self, other: S) -> Zip<Self, S> where     S: Stream<Error = Self::Error>,

An adapter for zipping two streams together.

fn chain<S>(self, other: S) -> Chain<Self, S> where     S: Stream<Item = Self::Item, Error = Self::Error>,

Adapter for chaining two stream.

fn peekable(self) -> Peekable<Self>

Creates a new stream which exposes a peek method.

fn chunks(self, capacity: usize) -> Chunks<Self>

An adaptor for chunking up items of the stream inside a vector.

fn select<S>(self, other: S) -> Select<Self, S> where     S: Stream<Item = Self::Item, Error = Self::Error>,

Creates a stream that selects the next element from either this stream or the provided one, whichever is ready first.

fn forward<S>(self, sink: S) -> Forward<Self, S> where     S: Sink<SinkItem = Self::Item>,     Self::Error: From<<S as Sink>::SinkError>,

A future that completes after the given stream has been fully processed into the sink, including flushing.

fn split(self) -> (SplitSink<Self>, SplitStream<Self>) where     Self: Sink,

Splits this Stream + Sink object into separate Stream and Sink objects.

fn inspect<F>(self, f: F) -> Inspect<Self, F> where     F: FnMut(&Self::Item),

Do something with each item of this stream, afterwards passing it on.

fn inspect_err<F>(self, f: F) -> InspectErr<Self, F> where     F: FnMut(&Self::Error),

Do something with the error of this stream, afterwards passing it on.