CppCMS/session_win32_file_storage.h

///////////////////////////////////////////////////////////////////////////////
//                                                                             
//  Copyright (C) 2008-2010  Artyom Beilis (Tonkikh) <artyomtnk@yahoo.com>     
//                                                                             
//  This program is free software: you can redistribute it and/or modify       
//  it under the terms of the GNU Lesser General Public License as published by
//  the Free Software Foundation, either version 3 of the License, or
//  (at your option) any later version.
//
//  This program 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 Lesser General Public License for more details.
//
//  You should have received a copy of the GNU Lesser General Public License
//  along with this program.  If not, see <http://www.gnu.org/licenses/>.
//
///////////////////////////////////////////////////////////////////////////////
#ifndef CPPCMS_SESSION_POSIX_FILE_STORAGE_H
#define CPPCMS_SESSION_POSIX_FILE_STORAGE_H

#include "defs.h"
#include "session_storage.h"
#include <booster/hold_ptr.h>
#include <vector>


namespace cppcms {
namespace sessions {

	class session_file_storage_factory;

	class CPPCMS_API session_file_storage : public session_storage {
	public:
		session_file_storage(std::string path);
		virtual ~session_file_storage();
		virtual void save(std::string const &sid,time_t timeout,std::string const &in);
		virtual bool load(std::string const &sid,time_t &timeout,std::string &out);
		virtual void remove(std::string const &sid);
	private:
		struct locked_file;
		struct data;
		bool read_timestamp(void *h);
		bool read_from_file(void *h,time_t &timeout,std::string &data);
		void save_to_file(void *h,time_t timeout,std::string const &in);
		bool read_all(void *,void *vbuf,int n);
		bool write_all(void *,void const *vbuf,int n);
		void gc();
		std::string file_name(std::string const &sid);

		// members
	
		booster::hold_ptr<data> d;

		std::string path_;
		// friends 
		friend struct locked_file;
		friend class session_file_storage_factory;
	};

	class CPPCMS_API session_file_storage_factory : public session_storage_factory {
	public:
		session_file_storage_factory(std::string path);
		virtual intrusive_ptr<session_storage> get();
		virtual bool requires_gc();
		virtual void gc_job();
		virtual ~session_file_storage_factory();
	private:
		struct data;
		intrusive_ptr<session_file_storage> storage_;
	};
} // sessions
} // cppcms

#endif