Module tokio::prelude::stream

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

Modules

futures_unordered

An unbounded set of futures.

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	[ Deprecated ] 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.
FutureSender	[ Deprecated ] Future returned by Sender::send.
FuturesOrdered	An unbounded queue of futures.
Inspect	Do something with the items of a stream, passing it on.
InspectErr	Do something with the error of a stream, passing it on.
Iter	[ Deprecated ] A stream which is just a shim over an underlying instance of Iterator.
IterOk	A stream which is just a shim over an underlying instance of Iterator.
IterResult	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	[ Deprecated ] 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.
PollFn	A stream which adapts a function returning Poll.
Receiver	[ Deprecated ] The receiving end of a channel which implements the Stream trait.
Repeat	Stream that produces the same element repeatedly.
ReuniteError	Error indicating a SplitSink<S> and SplitStream<S> were not two halves of a Stream + Split, and thus could not be reunited.
Select	An adapter for merging the output of two streams.
SendError	[ Deprecated ] Error type for sending, used when the receiving end of the channel is dropped
Sender	[ Deprecated ] The transmission end of a channel which is used to send values.
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

[ Deprecated ] 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

channel	[ Deprecated ] Creates an in-memory channel implementation of the Stream trait.
empty	Creates a stream which contains no elements.
futures_ordered	Converts a list of futures into a Stream of results from the futures.
futures_unordered	Converts a list of futures into a Stream of results from the futures.
iter	[ Deprecated ] Converts an Iterator over Results into a Stream which is always ready to yield the next value.
iter_ok	Converts an Iterator into a Stream which is always ready to yield the next value.
iter_result	Converts an Iterator over Results into a Stream which is always ready to yield the next value.
once	Creates a stream of single element
poll_fn	Creates a new stream wrapping around a function returning Poll.
repeat	Create a stream which produces the same item repeatedly.
unfold	Creates a Stream from a seed and a closure returning a Future.