pica/database/pool.h

//SPDX-FileCopyrightText: 2023 Yury Gubich <blue@macaw.me>
//SPDX-License-Identifier: GPL-3.0-or-later

#pragma once

#include <string>
#include <memory>
#include <queue>
#include <mutex>
#include <condition_variable>

#include "interface.h"
#include "resource.h"

namespace DB {
class Pool : public std::enable_shared_from_this<Pool> {
    struct Private {};
    friend class Resource;

    void free(std::unique_ptr<Interface> interface);

public:
    Pool(Private);
    Pool(const Pool&) = delete;
    Pool(Pool&&) = delete;
    ~Pool();
    Pool& operator = (const Pool&) = delete;
    Pool& operator = (Pool&&) = delete;

    static std::shared_ptr<Pool> create();
    Resource request();
    void addInterfaces(
        Interface::Type type,
        std::size_t amount,
        const std::string& login,
        const std::string& password,
        const std::string& database,
        const std::string& path
    );

private:
    std::mutex mutex;
    std::condition_variable conditional;
    std::queue<std::unique_ptr<Interface>> interfaces;

};
}