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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.
use crate::raw::*;
use crate::*;
use bytes::Bytes;
use futures::SinkExt;
use std::pin::Pin;
use std::task::{Context, Poll};
/// FuturesBytesSink is the adapter of [`Sink`] generated by [`Writer::into_bytes_sink`].
///
/// Users can use this adapter in cases where they need to use [`Sink`] trait. FuturesBytesSink
/// reuses the same concurrent and chunk settings from [`Writer`].
///
/// FuturesBytesSink also implements [`Unpin`], [`Send`] and [`Sync`].
pub struct FuturesBytesSink {
sink: BufferSink,
}
impl FuturesBytesSink {
/// Create a new sink from a [`oio::Writer`].
#[inline]
pub(crate) fn new(w: oio::Writer) -> Self {
FuturesBytesSink {
sink: BufferSink::new(w),
}
}
}
impl futures::Sink<Bytes> for FuturesBytesSink {
type Error = std::io::Error;
fn poll_ready(
mut self: Pin<&mut Self>,
cx: &mut Context<'_>,
) -> Poll<Result<(), std::io::Error>> {
self.sink.poll_ready_unpin(cx).map_err(format_std_io_error)
}
fn start_send(mut self: Pin<&mut Self>, item: Bytes) -> Result<(), std::io::Error> {
self.sink
.start_send_unpin(Buffer::from(item))
.map_err(format_std_io_error)
}
fn poll_flush(
mut self: Pin<&mut Self>,
cx: &mut Context<'_>,
) -> Poll<Result<(), std::io::Error>> {
self.sink.poll_flush_unpin(cx).map_err(format_std_io_error)
}
fn poll_close(
mut self: Pin<&mut Self>,
cx: &mut Context<'_>,
) -> Poll<Result<(), std::io::Error>> {
self.sink.poll_close_unpin(cx).map_err(format_std_io_error)
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::raw::MaybeSend;
#[test]
fn test_trait() {
let v = FuturesBytesSink::new(Box::new(()));
let _: Box<dyn Unpin + MaybeSend + Sync + 'static> = Box::new(v);
}
}