Module futures::stream [] [src]

Asynchronous streams

This module contains the Stream trait and a number of adaptors for this trait. This trait is very similar to the Iterator trait in the standard library except that it expresses the concept of blocking as well. A stream here is a sequential sequence of values which may take some amount of time in between to produce.

A stream may request that it is blocked between values while the next value is calculated, and provides a way to get notified once the next value is ready as well.

You can find more information/tutorials about streams online at https://tokio.rs

Structs

AndThen

A stream combinator which chains a computation onto values produced by a stream.

BufferUnordered

An adaptor for a stream of futures to execute the futures concurrently, if possible, delivering results as they become available.

Buffered

An adaptor for a stream of futures to execute the futures concurrently, if possible.

CatchUnwind

Stream for the catch_unwind combinator.

Chain

An adapter for chaining the output of two streams.

Chunks

An adaptor that chunks up elements in a vector.

Collect

A future which collects all of the values of a stream into a vector.

Concat

A stream combinator to concatenate the results of a stream into the first yielded item.

Concat2

A stream combinator to concatenate the results of a stream into the first yielded item.

Empty

A stream which contains no elements.

Filter

A stream combinator used to filter the results of a stream and only yield some values.

FilterMap

A combinator used to filter the results of a stream and simultaneously map them to a different type.

Flatten

A combinator used to flatten a stream-of-streams into one long stream of elements.

Fold

A future used to collect all the results of a stream into one generic type.

ForEach

A stream combinator which executes a unit closure over each item on a stream.

Forward

Future for the Stream::forward combinator, which sends a stream of values to a sink and then waits until the sink has fully flushed those values.

FromErr

A stream combinator to change the error type of a stream.

Fuse

A stream which "fuse"s a stream once it's terminated.

FuturesUnordered

An unbounded queue of futures.

Iter

A stream which is just a shim over an underlying instance of Iterator.

IterStream

A stream which is just a shim over an underlying instance of Iterator.

Map

A stream combinator which will change the type of a stream from one type to another.

MapErr

A stream combinator which will change the error type of a stream from one type to another.

Merge

An adapter for merging the output of two streams.

Once

A stream which emits single element and then EOF.

OrElse

A stream combinator which chains a computation onto errors produced by a stream.

Peekable

A Stream that implements a peek method.

Repeat

Stream that produces the same element repeatedly.

Select

An adapter for merging the output of two streams.

Skip

A stream combinator which skips a number of elements before continuing.

SkipWhile

A stream combinator which skips elements of a stream while a predicate holds.

SplitSink

A Sink part of the split pair

SplitStream

A Stream part of the split pair

StreamFuture

A combinator used to temporarily convert a stream into a future.

Take

A stream combinator which returns a maximum number of elements.

TakeWhile

A stream combinator which takes elements from a stream while a predicate holds.

Then

A stream combinator which chains a computation onto each item produced by a stream.

Unfold

A stream which creates futures, polls them and return their result

Wait

A stream combinator which converts an asynchronous stream to a blocking iterator.

Zip

An adapter for merging the output of two streams.

Enums

MergedItem

An item returned from a merge stream, which represents an item from one or both of the underlying streams.

Traits

Stream

A stream of values, not all of which may have been produced yet.

Functions

empty

Creates a stream which contains no elements.

futures_unordered

Converts a list of futures into a Stream of results from the futures.

iter

Converts an Iterator over Results into a Stream which is always ready to yield the next value.

once

Creates a stream of single element

repeat

Create a stream which produces the same item repeatedly.

unfold

Creates a Stream from a seed and a closure returning a Future.

Type Definitions

BoxStream

A type alias for Box<Stream + Send>