unixfilewatcher.hpp

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/*
    Copyright (C) 2014-2016 Leosac
 
    This file is part of Leosac.
 
    Leosac is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
 
    Leosac is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    GNU Affero General Public License for more details.
 
    You should have received a copy of the GNU Affero General Public License
    along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
 
#ifndef UNIXFILEWATCHER_HPP
#define UNIXFILEWATCHER_HPP
 
#include <atomic>
#include <map>
#include <string>
#include <thread>
 
namespace Leosac
{
namespace Tools
{
 
class UnixFileWatcher
{
    using UnixFd = int;
    struct WatchParams
    {
        std::string path;
        int mask;
    };
    using Watches = std::map<UnixFd, WatchParams>;
 
    static const long DefaultTimeoutMs = 2000;
 
  public:
    explicit UnixFileWatcher();
 
    ~UnixFileWatcher();
 
    UnixFileWatcher(const UnixFileWatcher &other) = delete;
 
    UnixFileWatcher &operator=(const UnixFileWatcher &other) = delete;
 
  public:
    void start();
 
    void stop();
 
  public:
    void watchFile(const std::string &path);
 
    bool fileHasChanged(const std::string &path) const;
 
    void fileReset(const std::string &path);
 
    std::size_t size() const;
 
  private:
    void run();
 
  private:
    std::thread _thread;
    std::atomic<bool> _isRunning;
    UnixFd _inotifyFd;
    Watches _watches;
};
}
}
 
#endif // UNIXFILEWATCHER_HPP