| <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/futures-util-0.3.28/src/stream/futures_ordered.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>futures_ordered.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../../normalize.css"><link rel="stylesheet" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../../ayu.css" disabled><link rel="stylesheet" href="../../../dark.css" disabled><link rel="stylesheet" href="../../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../../storage.js"></script><script defer src="../../../source-script.js"></script><script defer src="../../../source-files.js"></script><script defer src="../../../main.js"></script><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../../futures_util/index.html"><div class="logo-container"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../../futures_util/index.html"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| </pre><pre class="rust"><code><span class="kw">use </span><span class="kw">crate</span>::stream::{FuturesUnordered, StreamExt}; |
| <span class="kw">use </span>alloc::collections::binary_heap::{BinaryHeap, PeekMut}; |
| <span class="kw">use </span>core::cmp::Ordering; |
| <span class="kw">use </span>core::fmt::{<span class="self">self</span>, Debug}; |
| <span class="kw">use </span>core::iter::FromIterator; |
| <span class="kw">use </span>core::pin::Pin; |
| <span class="kw">use </span>futures_core::future::Future; |
| <span class="kw">use </span>futures_core::ready; |
| <span class="kw">use </span>futures_core::stream::Stream; |
| <span class="kw">use </span>futures_core::{ |
| task::{Context, Poll}, |
| FusedStream, |
| }; |
| <span class="kw">use </span>pin_project_lite::pin_project; |
| |
| <span class="macro">pin_project! </span>{ |
| <span class="attribute">#[must_use = <span class="string">"futures do nothing unless you `.await` or poll them"</span>] |
| #[derive(Debug)] |
| </span><span class="kw">struct </span>OrderWrapper<T> { |
| <span class="attribute">#[pin] |
| </span>data: T, <span class="comment">// A future or a future's output |
| </span>index: isize, |
| } |
| } |
| |
| <span class="kw">impl</span><T> PartialEq <span class="kw">for </span>OrderWrapper<T> { |
| <span class="kw">fn </span>eq(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span><span class="self">Self</span>) -> bool { |
| <span class="self">self</span>.index == other.index |
| } |
| } |
| |
| <span class="kw">impl</span><T> Eq <span class="kw">for </span>OrderWrapper<T> {} |
| |
| <span class="kw">impl</span><T> PartialOrd <span class="kw">for </span>OrderWrapper<T> { |
| <span class="kw">fn </span>partial_cmp(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span><span class="self">Self</span>) -> <span class="prelude-ty">Option</span><Ordering> { |
| <span class="prelude-val">Some</span>(<span class="self">self</span>.cmp(other)) |
| } |
| } |
| |
| <span class="kw">impl</span><T> Ord <span class="kw">for </span>OrderWrapper<T> { |
| <span class="kw">fn </span>cmp(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span><span class="self">Self</span>) -> Ordering { |
| <span class="comment">// BinaryHeap is a max heap, so compare backwards here. |
| </span>other.index.cmp(<span class="kw-2">&</span><span class="self">self</span>.index) |
| } |
| } |
| |
| <span class="kw">impl</span><T> Future <span class="kw">for </span>OrderWrapper<T> |
| <span class="kw">where |
| </span>T: Future, |
| { |
| <span class="kw">type </span>Output = OrderWrapper<T::Output>; |
| |
| <span class="kw">fn </span>poll(<span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, cx: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>) -> Poll<<span class="self">Self</span>::Output> { |
| <span class="kw">let </span>index = <span class="self">self</span>.index; |
| <span class="self">self</span>.project().data.poll(cx).map(|output| OrderWrapper { data: output, index }) |
| } |
| } |
| |
| <span class="doccomment">/// An unbounded queue of futures. |
| /// |
| /// This "combinator" is similar to [`FuturesUnordered`], but it imposes a FIFO order |
| /// on top of the set of futures. While futures in the set will race to |
| /// completion in parallel, results will only be returned in the order their |
| /// originating futures were added to the queue. |
| /// |
| /// Futures are pushed into this queue and their realized values are yielded in |
| /// order. This structure is optimized to manage a large number of futures. |
| /// Futures managed by `FuturesOrdered` will only be polled when they generate |
| /// notifications. This reduces the required amount of work needed to coordinate |
| /// large numbers of futures. |
| /// |
| /// When a `FuturesOrdered` is first created, it does not contain any futures. |
| /// Calling `poll` in this state will result in `Poll::Ready(None))` to be |
| /// returned. Futures are submitted to the queue using `push`; however, the |
| /// future will **not** be polled at this point. `FuturesOrdered` will only |
| /// poll managed futures when `FuturesOrdered::poll` is called. As such, it |
| /// is important to call `poll` after pushing new futures. |
| /// |
| /// If `FuturesOrdered::poll` returns `Poll::Ready(None)` this means that |
| /// the queue is currently not managing any futures. A future may be submitted |
| /// to the queue at a later time. At that point, a call to |
| /// `FuturesOrdered::poll` will either return the future's resolved value |
| /// **or** `Poll::Pending` if the future has not yet completed. When |
| /// multiple futures are submitted to the queue, `FuturesOrdered::poll` will |
| /// return `Poll::Pending` until the first future completes, even if |
| /// some of the later futures have already completed. |
| /// |
| /// Note that you can create a ready-made `FuturesOrdered` via the |
| /// [`collect`](Iterator::collect) method, or you can start with an empty queue |
| /// with the `FuturesOrdered::new` constructor. |
| /// |
| /// This type is only available when the `std` or `alloc` feature of this |
| /// library is activated, and it is activated by default. |
| </span><span class="attribute">#[must_use = <span class="string">"streams do nothing unless polled"</span>] |
| </span><span class="kw">pub struct </span>FuturesOrdered<T: Future> { |
| in_progress_queue: FuturesUnordered<OrderWrapper<T>>, |
| queued_outputs: BinaryHeap<OrderWrapper<T::Output>>, |
| next_incoming_index: isize, |
| next_outgoing_index: isize, |
| } |
| |
| <span class="kw">impl</span><T: Future> Unpin <span class="kw">for </span>FuturesOrdered<T> {} |
| |
| <span class="kw">impl</span><Fut: Future> FuturesOrdered<Fut> { |
| <span class="doccomment">/// Constructs a new, empty `FuturesOrdered` |
| /// |
| /// The returned `FuturesOrdered` does not contain any futures and, in this |
| /// state, `FuturesOrdered::poll_next` will return `Poll::Ready(None)`. |
| </span><span class="kw">pub fn </span>new() -> <span class="self">Self </span>{ |
| <span class="self">Self </span>{ |
| in_progress_queue: FuturesUnordered::new(), |
| queued_outputs: BinaryHeap::new(), |
| next_incoming_index: <span class="number">0</span>, |
| next_outgoing_index: <span class="number">0</span>, |
| } |
| } |
| |
| <span class="doccomment">/// Returns the number of futures contained in the queue. |
| /// |
| /// This represents the total number of in-flight futures, both |
| /// those currently processing and those that have completed but |
| /// which are waiting for earlier futures to complete. |
| </span><span class="kw">pub fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.in_progress_queue.len() + <span class="self">self</span>.queued_outputs.len() |
| } |
| |
| <span class="doccomment">/// Returns `true` if the queue contains no futures |
| </span><span class="kw">pub fn </span>is_empty(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.in_progress_queue.is_empty() && <span class="self">self</span>.queued_outputs.is_empty() |
| } |
| |
| <span class="doccomment">/// Push a future into the queue. |
| /// |
| /// This function submits the given future to the internal set for managing. |
| /// This function will not call `poll` on the submitted future. The caller |
| /// must ensure that `FuturesOrdered::poll` is called in order to receive |
| /// task notifications. |
| </span><span class="attribute">#[deprecated(note = <span class="string">"use `push_back` instead"</span>)] |
| </span><span class="kw">pub fn </span>push(<span class="kw-2">&mut </span><span class="self">self</span>, future: Fut) { |
| <span class="self">self</span>.push_back(future); |
| } |
| |
| <span class="doccomment">/// Pushes a future to the back of the queue. |
| /// |
| /// This function submits the given future to the internal set for managing. |
| /// This function will not call `poll` on the submitted future. The caller |
| /// must ensure that `FuturesOrdered::poll` is called in order to receive |
| /// task notifications. |
| </span><span class="kw">pub fn </span>push_back(<span class="kw-2">&mut </span><span class="self">self</span>, future: Fut) { |
| <span class="kw">let </span>wrapped = OrderWrapper { data: future, index: <span class="self">self</span>.next_incoming_index }; |
| <span class="self">self</span>.next_incoming_index += <span class="number">1</span>; |
| <span class="self">self</span>.in_progress_queue.push(wrapped); |
| } |
| |
| <span class="doccomment">/// Pushes a future to the front of the queue. |
| /// |
| /// This function submits the given future to the internal set for managing. |
| /// This function will not call `poll` on the submitted future. The caller |
| /// must ensure that `FuturesOrdered::poll` is called in order to receive |
| /// task notifications. This future will be the next future to be returned |
| /// complete. |
| </span><span class="kw">pub fn </span>push_front(<span class="kw-2">&mut </span><span class="self">self</span>, future: Fut) { |
| <span class="kw">let </span>wrapped = OrderWrapper { data: future, index: <span class="self">self</span>.next_outgoing_index - <span class="number">1 </span>}; |
| <span class="self">self</span>.next_outgoing_index -= <span class="number">1</span>; |
| <span class="self">self</span>.in_progress_queue.push(wrapped); |
| } |
| } |
| |
| <span class="kw">impl</span><Fut: Future> Default <span class="kw">for </span>FuturesOrdered<Fut> { |
| <span class="kw">fn </span>default() -> <span class="self">Self </span>{ |
| <span class="self">Self</span>::new() |
| } |
| } |
| |
| <span class="kw">impl</span><Fut: Future> Stream <span class="kw">for </span>FuturesOrdered<Fut> { |
| <span class="kw">type </span>Item = Fut::Output; |
| |
| <span class="kw">fn </span>poll_next(<span class="kw-2">mut </span><span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, cx: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>) -> Poll<<span class="prelude-ty">Option</span><<span class="self">Self</span>::Item>> { |
| <span class="kw">let </span>this = <span class="kw-2">&mut *</span><span class="self">self</span>; |
| |
| <span class="comment">// Check to see if we've already received the next value |
| </span><span class="kw">if let </span><span class="prelude-val">Some</span>(next_output) = this.queued_outputs.peek_mut() { |
| <span class="kw">if </span>next_output.index == this.next_outgoing_index { |
| this.next_outgoing_index += <span class="number">1</span>; |
| <span class="kw">return </span>Poll::Ready(<span class="prelude-val">Some</span>(PeekMut::pop(next_output).data)); |
| } |
| } |
| |
| <span class="kw">loop </span>{ |
| <span class="kw">match </span><span class="macro">ready!</span>(this.in_progress_queue.poll_next_unpin(cx)) { |
| <span class="prelude-val">Some</span>(output) => { |
| <span class="kw">if </span>output.index == this.next_outgoing_index { |
| this.next_outgoing_index += <span class="number">1</span>; |
| <span class="kw">return </span>Poll::Ready(<span class="prelude-val">Some</span>(output.data)); |
| } <span class="kw">else </span>{ |
| this.queued_outputs.push(output) |
| } |
| } |
| <span class="prelude-val">None </span>=> <span class="kw">return </span>Poll::Ready(<span class="prelude-val">None</span>), |
| } |
| } |
| } |
| |
| <span class="kw">fn </span>size_hint(<span class="kw-2">&</span><span class="self">self</span>) -> (usize, <span class="prelude-ty">Option</span><usize>) { |
| <span class="kw">let </span>len = <span class="self">self</span>.len(); |
| (len, <span class="prelude-val">Some</span>(len)) |
| } |
| } |
| |
| <span class="kw">impl</span><Fut: Future> Debug <span class="kw">for </span>FuturesOrdered<Fut> { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { |
| <span class="macro">write!</span>(f, <span class="string">"FuturesOrdered {{ ... }}"</span>) |
| } |
| } |
| |
| <span class="kw">impl</span><Fut: Future> FromIterator<Fut> <span class="kw">for </span>FuturesOrdered<Fut> { |
| <span class="kw">fn </span>from_iter<T>(iter: T) -> <span class="self">Self |
| </span><span class="kw">where |
| </span>T: IntoIterator<Item = Fut>, |
| { |
| <span class="kw">let </span>acc = <span class="self">Self</span>::new(); |
| iter.into_iter().fold(acc, |<span class="kw-2">mut </span>acc, item| { |
| acc.push_back(item); |
| acc |
| }) |
| } |
| } |
| |
| <span class="kw">impl</span><Fut: Future> FusedStream <span class="kw">for </span>FuturesOrdered<Fut> { |
| <span class="kw">fn </span>is_terminated(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.in_progress_queue.is_terminated() && <span class="self">self</span>.queued_outputs.is_empty() |
| } |
| } |
| |
| <span class="kw">impl</span><Fut: Future> Extend<Fut> <span class="kw">for </span>FuturesOrdered<Fut> { |
| <span class="kw">fn </span>extend<I>(<span class="kw-2">&mut </span><span class="self">self</span>, iter: I) |
| <span class="kw">where |
| </span>I: IntoIterator<Item = Fut>, |
| { |
| <span class="kw">for </span>item <span class="kw">in </span>iter { |
| <span class="self">self</span>.push_back(item); |
| } |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="futures_util" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
