rocketmq-store 0.6.0

Storage layer for Apache RocketMQ in Rust.
Documentation 
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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 std::collections::VecDeque;
use std::sync::Arc;
use std::sync::Mutex;

use tracing::warn;

pub struct TransientStorePool {
    pool_size: usize,
    file_size: usize,
    available_buffers: Arc<Mutex<VecDeque<Vec<u8>>>>,
    is_real_commit: Arc<Mutex<bool>>,
}

impl TransientStorePool {
    pub fn new(pool_size: usize, file_size: usize) -> Self {
        let available_buffers = Arc::new(Mutex::new(VecDeque::with_capacity(pool_size)));
        let is_real_commit = Arc::new(Mutex::new(true));
        TransientStorePool {
            pool_size,
            file_size,
            available_buffers,
            is_real_commit,
        }
    }

    pub fn init(&self) {
        let mut available_buffers = self.available_buffers.lock().unwrap();
        for _ in 0..self.pool_size {
            let buffer = vec![0u8; self.file_size];
            available_buffers.push_back(buffer);
        }
    }

    pub fn destroy(&self) {
        let mut available_buffers = self.available_buffers.lock().unwrap();
        available_buffers.clear();
    }

    pub fn return_buffer(&self, buffer: Vec<u8>) {
        let mut available_buffers = self.available_buffers.lock().unwrap();
        available_buffers.push_front(buffer);
    }

    pub fn borrow_buffer(&self) -> Option<Vec<u8>> {
        let mut available_buffers = self.available_buffers.lock().unwrap();
        let buffer = available_buffers.pop_front();
        if available_buffers.len() < self.pool_size / 10 * 4 {
            warn!(
                "TransientStorePool only remain {} sheets.",
                available_buffers.len()
            );
        }
        buffer
    }

    pub fn available_buffer_nums(&self) -> usize {
        let available_buffers = self.available_buffers.lock().unwrap();
        available_buffers.len()
    }

    pub fn is_real_commit(&self) -> bool {
        let is_real_commit = self.is_real_commit.lock().unwrap();
        *is_real_commit
    }

    pub fn set_real_commit(&self, real_commit: bool) {
        let mut is_real_commit = self.is_real_commit.lock().unwrap();
        *is_real_commit = real_commit;
    }
}

impl Clone for TransientStorePool {
    fn clone(&self) -> Self {
        TransientStorePool {
            pool_size: self.pool_size,
            file_size: self.file_size,
            available_buffers: self.available_buffers.clone(),
            is_real_commit: self.is_real_commit.clone(),
        }
    }
}