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Medium.hpp

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/*******************************************************************************
 * This file is part of openWNS (open Wireless Network Simulator)
 * _____________________________________________________________________________
 *
 * Copyright (C) 2004-2007
 * Chair of Communication Networks (ComNets)
 * Kopernikusstr. 16, D-52074 Aachen, Germany
 * phone: ++49-241-80-27910,
 * fax: ++49-241-80-22242
 * email: info@openwns.org
 * www: http://www.openwns.org
 * _____________________________________________________________________________
 *
 * openWNS is free software; you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License version 2 as published by the
 * Free Software Foundation;
 *
 * openWNS 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/>.
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#ifndef SIMPLETL_MEDIUM_HPP
#define SIMPLETL_MEDIUM_HPP


#include <WNS/events/scheduler/Callable.hpp>
#include <WNS/events/scheduler/Interface.hpp>
#include <WNS/simulator/Time.hpp>
#include <WNS/simulator/ISimulator.hpp>
#include <map>
#include <queue>

namespace simpletl {
    class Medium
    {
    public:
        static void send(wns::events::scheduler::Callable c, wns::simulator::Time delay)
        {
            if (busy)
            {
                // Medium is busy. Queue the event
                eventqueue.push(std::make_pair(c, delay));
            }
            else
            {
                // Medium was free. Now it is busy. Send the event.
                busy = true;
                wns::simulator::getEventScheduler()->scheduleDelay(c, delay);
            }
        }
        
        static void setFree();

    private:
        typedef std::pair<wns::events::scheduler::Callable, wns::simulator::Time> QEntry;
        typedef std::queue<QEntry> EventQueue;
        static bool busy;
        static EventQueue eventqueue;
    };
}

#endif // SIMPLETL_MEDIUM_HPP

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