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feat: adapt the
CompleteReader (#3861)
* feat: add `TwoWaysReader` and `FourWaysReader` * refactor: refactor `CompleteReader`
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,159 @@ | ||
| // 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 std::{ | ||
| io::SeekFrom, | ||
| task::{Context, Poll}, | ||
| }; | ||
|
|
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| use crate::raw::*; | ||
|
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| /// TwoWaysReader is used to implement [`Read`] based on two ways. | ||
| /// | ||
| /// Users can wrap two different readers together. | ||
| pub enum TwoWaysReader<ONE, TWO> { | ||
| /// The first type for the [`TwoWaysReader`]. | ||
| One(ONE), | ||
| /// The second type for the [`TwoWaysReader`]. | ||
| Two(TWO), | ||
| } | ||
|
|
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| impl<ONE: oio::Read, TWO: oio::Read> oio::Read for TwoWaysReader<ONE, TWO> { | ||
| fn poll_read(&mut self, cx: &mut Context<'_>, buf: &mut [u8]) -> Poll<crate::Result<usize>> { | ||
| match self { | ||
| Self::One(one) => one.poll_read(cx, buf), | ||
| Self::Two(two) => two.poll_read(cx, buf), | ||
| } | ||
| } | ||
|
|
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| fn poll_seek(&mut self, cx: &mut Context<'_>, pos: SeekFrom) -> Poll<crate::Result<u64>> { | ||
| match self { | ||
| Self::One(one) => one.poll_seek(cx, pos), | ||
| Self::Two(two) => two.poll_seek(cx, pos), | ||
| } | ||
| } | ||
|
|
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| fn poll_next(&mut self, cx: &mut Context<'_>) -> Poll<Option<crate::Result<bytes::Bytes>>> { | ||
| match self { | ||
| Self::One(one) => one.poll_next(cx), | ||
| Self::Two(two) => two.poll_next(cx), | ||
| } | ||
| } | ||
| } | ||
|
|
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| impl<ONE: oio::BlockingRead, TWO: oio::BlockingRead> oio::BlockingRead for TwoWaysReader<ONE, TWO> { | ||
| fn read(&mut self, buf: &mut [u8]) -> crate::Result<usize> { | ||
| match self { | ||
| Self::One(one) => one.read(buf), | ||
| Self::Two(two) => two.read(buf), | ||
| } | ||
| } | ||
|
|
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| fn seek(&mut self, pos: SeekFrom) -> crate::Result<u64> { | ||
| match self { | ||
| Self::One(one) => one.seek(pos), | ||
| Self::Two(two) => two.seek(pos), | ||
| } | ||
| } | ||
|
|
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| fn next(&mut self) -> Option<crate::Result<bytes::Bytes>> { | ||
| match self { | ||
| Self::One(one) => one.next(), | ||
| Self::Two(two) => two.next(), | ||
| } | ||
| } | ||
| } | ||
|
|
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| /// FourWaysReader is used to implement [`Read`] based on four ways. | ||
| /// | ||
| /// Users can wrap four different readers together. | ||
| pub enum FourWaysReader<ONE, TWO, THREE, FOUR> { | ||
| /// The first type for the [`TwoWaysReader`]. | ||
| One(ONE), | ||
| /// The second type for the [`TwoWaysReader`]. | ||
| Two(TWO), | ||
| /// The third type for the [`TwoWaysReader`]. | ||
| Three(THREE), | ||
| /// The fourth type for the [`TwoWaysReader`]. | ||
| Four(FOUR), | ||
| } | ||
|
|
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| impl<ONE: oio::Read, TWO: oio::Read, THREE: oio::Read, FOUR: oio::Read> oio::Read | ||
| for FourWaysReader<ONE, TWO, THREE, FOUR> | ||
| { | ||
| fn poll_read(&mut self, cx: &mut Context<'_>, buf: &mut [u8]) -> Poll<crate::Result<usize>> { | ||
| match self { | ||
| Self::One(one) => one.poll_read(cx, buf), | ||
| Self::Two(two) => two.poll_read(cx, buf), | ||
| Self::Three(three) => three.poll_read(cx, buf), | ||
| Self::Four(four) => four.poll_read(cx, buf), | ||
| } | ||
| } | ||
|
|
||
| fn poll_seek(&mut self, cx: &mut Context<'_>, pos: SeekFrom) -> Poll<crate::Result<u64>> { | ||
| match self { | ||
| Self::One(one) => one.poll_seek(cx, pos), | ||
| Self::Two(two) => two.poll_seek(cx, pos), | ||
| Self::Three(three) => three.poll_seek(cx, pos), | ||
| Self::Four(four) => four.poll_seek(cx, pos), | ||
| } | ||
| } | ||
|
|
||
| fn poll_next(&mut self, cx: &mut Context<'_>) -> Poll<Option<crate::Result<bytes::Bytes>>> { | ||
| match self { | ||
| Self::One(one) => one.poll_next(cx), | ||
| Self::Two(two) => two.poll_next(cx), | ||
| Self::Three(three) => three.poll_next(cx), | ||
| Self::Four(four) => four.poll_next(cx), | ||
| } | ||
| } | ||
| } | ||
|
|
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| impl< | ||
| ONE: oio::BlockingRead, | ||
| TWO: oio::BlockingRead, | ||
| THREE: oio::BlockingRead, | ||
| FOUR: oio::BlockingRead, | ||
| > oio::BlockingRead for FourWaysReader<ONE, TWO, THREE, FOUR> | ||
| { | ||
| fn read(&mut self, buf: &mut [u8]) -> crate::Result<usize> { | ||
| match self { | ||
| Self::One(one) => one.read(buf), | ||
| Self::Two(two) => two.read(buf), | ||
| Self::Three(three) => three.read(buf), | ||
| Self::Four(four) => four.read(buf), | ||
| } | ||
| } | ||
|
|
||
| fn seek(&mut self, pos: SeekFrom) -> crate::Result<u64> { | ||
| match self { | ||
| Self::One(one) => one.seek(pos), | ||
| Self::Two(two) => two.seek(pos), | ||
| Self::Three(three) => three.seek(pos), | ||
| Self::Four(four) => four.seek(pos), | ||
| } | ||
| } | ||
|
|
||
| fn next(&mut self) -> Option<crate::Result<bytes::Bytes>> { | ||
| match self { | ||
| Self::One(one) => one.next(), | ||
| Self::Two(two) => two.next(), | ||
| Self::Three(three) => three.next(), | ||
| Self::Four(four) => four.next(), | ||
| } | ||
| } | ||
| } |
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