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/*
* UltraStar Deluxe - Karaoke Game
*
* UltraStar Deluxe is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#ifndef EVENT_MANAGER_HPP
#define EVENT_MANAGER_HPP
#include <SDL/SDL.h>
#include <boost/bind.hpp>
#include <boost/circular_buffer.hpp>
#include <boost/progress.hpp>
#include <boost/shared_ptr.hpp>
#include <boost/thread/condition.hpp>
#include <boost/thread/shared_mutex.hpp>
#include <boost/thread/thread.hpp>
#include <boost/signals2.hpp>
#include <log4cpp/Category.hh>
namespace usdx
{
/**
* This class is the junction point between the SDL Thread (with the SDL
* main loop) and the event thread. The EventManager buffers the SDL
* Events until the thread has time to handle the events. Because one
* thread pushes the events and an other thread is reading the access to
* the buffer have to be mutual exclusive.
*/
class EventManager
{
private:
static log4cpp::Category& log;
EventManager(const EventManager&); //< no copy
EventManager& operator=(const EventManager&); //< no assignment
/**
* Type of the buffer for the Events.
*/
typedef boost::circular_buffer<const SDL_Event*> buffer_type;
/**
* Buffer to store the events.
*/
buffer_type buffer;
/**
* How many events currently waiting to getting handled.
*/
buffer_type::size_type waiting;
/**
* Mutex to guaranty the mutual exclusion between the multiple
* threads.
*/
mutable boost::shared_mutex mutex;
boost::condition not_empty;
boost::condition not_full;
/**
* Returns if the buffer is contains at least one element or
* not.
* This functions is not thread-safe! Intended to use as
* condition for boost::condition#wait.
*/
bool is_not_empty() const;
/**
* Returns if the buffer has at least space for one element left
* or not.
* This functions is not thread-safe! Intended to use as
* condition for boost::condition#wait.
*/
bool is_not_full() const;
/**
* This function is used to get the next event from the
* buffer. If no event is waiting, this method blocks until
* there is one event available.
*/
void get_next_event(SDL_Event& event);
public:
EventManager(int capacity = 20);
virtual ~EventManager();
void add_event(const SDL_Event& item);
/**
* This function is intended to be used as separate thread. It
* will run forever until for example a
* boost::thread_interrupted is thrown.
*/
void handle_events(void);
/**
* This function returns (thread-safe) weather there is space in
* left the buffer for a new element or not.
*/
bool available(void);
boost::signals2::signal<void (int, int)> mouse_move;
};
};
#endif
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