shmipc 0.1.1

Shared memory IPC for Rust
Documentation 
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// Copyright 2025 CloudWeGo Authors
//
// Licensed 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::{collections::VecDeque, sync::Mutex};

use crate::{Error, stream::Stream};

#[derive(Debug)]
pub struct StreamPool {
    streams: Mutex<VecDeque<Stream>>,
}

impl StreamPool {
    pub fn new(pool_capacity: usize) -> Self {
        Self {
            streams: Mutex::new(VecDeque::with_capacity(pool_capacity)),
        }
    }

    pub async fn push(&self, mut stream: Stream) -> Result<(), Error> {
        {
            let mut streams = self.streams.lock().unwrap();
            if streams.len() < streams.capacity() {
                streams.push_back(stream);
                return Ok(());
            }
        }
        stream.safe_close_notify();
        _ = stream.close().await;
        Err(Error::StreamPoolFull)
    }

    pub fn pop(&self) -> Option<Stream> {
        self.streams.lock().unwrap().pop_front()
    }

    pub async fn close(&self) {
        while let Some(mut s) = self.pop() {
            s.safe_close_notify();
            _ = s.close().await;
        }
    }
}