data_store.hpp

//--------------------------------------------------------------------------------------------------
// Copyright (c) 2020 Marcus Geelnard
//
// This software is provided 'as-is', without any express or implied warranty. In no event will the
// authors be held liable for any damages arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose, including commercial
// applications, and to alter it and redistribute it freely, subject to the following restrictions:
//
//  1. The origin of this software must not be misrepresented; you must not claim that you wrote
//     the original software. If you use this software in a product, an acknowledgment in the
//     product documentation would be appreciated but is not required.
//
//  2. Altered source versions must be plainly marked as such, and must not be misrepresented as
//     being the original software.
//
//  3. This notice may not be removed or altered from any source distribution.
//--------------------------------------------------------------------------------------------------
 
#ifndef BUILDCACHE_DATA_STORE_HPP_
#define BUILDCACHE_DATA_STORE_HPP_
 
#include <base/time_utils.hpp>
 
#include <string>
 
namespace bcache {
class data_store_t {
public:
  class item_t {
  public:
    item_t(const std::string& value) : m_value(value), m_is_valid(true) {
    }
 
    item_t() {
    }
 
    const std::string& value() const {
      return m_value;
    }
 
    bool is_valid() const {
      return m_is_valid;
    }
 
  private:
    const std::string m_value;
    const bool m_is_valid = false;
  };
 
  data_store_t(const std::string& name);
 
  void store_item(const std::string& key, const std::string& value, const time::seconds_t timeout);
 
  item_t get_item(const std::string& key);
 
  void remove_item(const std::string& key);
 
  void clear();
 
private:
  std::string make_file_path(const std::string& key);
  void perform_housekeeping();
 
  std::string m_root_dir;
};
}  // namespace bcache
 
#endif  // BUILDCACHE_DATA_STORE_HPP_