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feat: provide send-wrapper to contidionally implement Send for operat…
…ors (#4443) * feat: provide send-wrapper to contidionally implement Send for operators Signed-off-by: Ruihang Xia <waynestxia@gmail.com> * implement IntoSend* Signed-off-by: Ruihang Xia <waynestxia@gmail.com> * fix typo Signed-off-by: Ruihang Xia <waynestxia@gmail.com> --------- Signed-off-by: Ruihang Xia <waynestxia@gmail.com>
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| // Licensed to the Apache Software Foundation (ASF) under one | ||
| // or more contributor license agreements. See the NOTICE file | ||
| // distributed with this work for additional information | ||
| // regarding copyright ownership. The ASF licenses this file | ||
| // to you under the Apache License, Version 2.0 (the | ||
| // "License"); you may not use this file except in compliance | ||
| // with the License. You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, | ||
| // software distributed under the License is distributed on an | ||
| // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | ||
| // KIND, either express or implied. See the License for the | ||
| // specific language governing permissions and limitations | ||
| // under the License. | ||
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| //! Conditionally add the `Send` marker trait for the wrapped type. | ||
| //! Only take effect when the `send_wrapper` feature is enabled. | ||
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| use futures::Stream; | ||
| #[cfg(feature = "send_wrapper")] | ||
| pub use send_wrapper::SendWrapper; | ||
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| #[cfg(not(feature = "send_wrapper"))] | ||
| pub use noop_wrapper::NoopWrapper as SendWrapper; | ||
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| #[cfg(not(feature = "send_wrapper"))] | ||
| mod noop_wrapper { | ||
| use std::{ | ||
| pin::Pin, | ||
| task::{Context, Poll}, | ||
| }; | ||
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| use futures::{Future, Stream}; | ||
| use pin_project::pin_project; | ||
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| #[pin_project] | ||
| pub struct NoopWrapper<T> { | ||
| #[pin] | ||
| item: T, | ||
| } | ||
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| impl<T> Future for NoopWrapper<T> | ||
| where | ||
| T: Future, | ||
| { | ||
| type Output = T::Output; | ||
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| fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { | ||
| let this = self.project(); | ||
| this.item.poll(cx) | ||
| } | ||
| } | ||
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| impl<T> Stream for NoopWrapper<T> | ||
| where | ||
| T: Stream, | ||
| { | ||
| type Item = T::Item; | ||
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| fn poll_next(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> { | ||
| let this = self.project(); | ||
| this.item.poll_next(cx) | ||
| } | ||
| } | ||
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| impl<T> NoopWrapper<T> { | ||
| pub fn new(item: T) -> Self { | ||
| Self { item } | ||
| } | ||
| } | ||
| } | ||
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| pub trait IntoSendFuture { | ||
| type Output; | ||
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| fn into_send(self) -> Self::Output; | ||
| } | ||
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| impl<T> IntoSendFuture for T | ||
| where | ||
| T: futures::Future, | ||
| { | ||
| type Output = SendWrapper<T>; | ||
| fn into_send(self) -> Self::Output { | ||
| SendWrapper::new(self) | ||
| } | ||
| } | ||
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| pub trait IntoSendStream { | ||
| type Output; | ||
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| fn into_send(self) -> Self::Output; | ||
| } | ||
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| impl<T> IntoSendStream for T | ||
| where | ||
| T: Stream, | ||
| { | ||
| type Output = SendWrapper<T>; | ||
| fn into_send(self) -> Self::Output { | ||
| SendWrapper::new(self) | ||
| } | ||
| } |