mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
synced 2026-05-09 23:28:00 +00:00
Bastian Köcher
e3e651f72c
* Happy new year Updates the copyright years and fixes wrong license headers. * Fix the template * Split HEADER into HEADER-APACHE & HEADER-GPL
65 lines
1.8 KiB
Rust
65 lines
1.8 KiB
Rust
// This file is part of Substrate.
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// Copyright (C) 2020-2021 Parity Technologies (UK) Ltd.
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// SPDX-License-Identifier: GPL-3.0-or-later WITH Classpath-exception-2.0
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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use futures::stream::Stream;
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use futures::future::FutureExt;
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use futures::ready;
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use futures_timer::Delay;
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use std::pin::Pin;
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use std::task::{Context, Poll};
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use std::time::Duration;
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/// Exponentially increasing interval
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///
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/// Doubles interval duration on each tick until the configured maximum is reached.
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pub struct ExpIncInterval {
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max: Duration,
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next: Duration,
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delay: Delay,
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}
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impl ExpIncInterval {
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/// Create a new [`ExpIncInterval`].
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pub fn new(start: Duration, max: Duration) -> Self {
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let delay = Delay::new(start);
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Self {
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max,
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next: start * 2,
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delay,
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}
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}
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/// Fast forward the exponentially increasing interval to the configured maximum.
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pub fn set_to_max(&mut self) {
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self.next = self.max;
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self.delay = Delay::new(self.next);
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}
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}
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impl Stream for ExpIncInterval {
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type Item = ();
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fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<Option<Self::Item>> {
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ready!(self.delay.poll_unpin(cx));
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self.delay = Delay::new(self.next);
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self.next = std::cmp::min(self.max, self.next * 2);
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Poll::Ready(Some(()))
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}
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}
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