MQMutex.h

/*
 * Copyright (c) 2015 Pavel Vainerman.
 *
 * 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, version 2.1.
 *
 * 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 Lesser 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 MQMutex_H_
#define MQMutex_H_
//--------------------------------------------------------------------------
#include <deque>
#include <list>
#include <memory>
#include "Mutex.h"
#include "MessageType.h"
//--------------------------------------------------------------------------
namespace uniset
{
    //--------------------------------------------------------------------------
    typedef std::shared_ptr<uniset::VoidMessage> VoidMessagePtr;
    //--------------------------------------------------------------------------
 
    class MQMutex
    {
        public:
            MQMutex( size_t qsize = 2000 );
 
            void push( const VoidMessagePtr& msg );
 
            VoidMessagePtr top() noexcept;
 
            size_t size();
            bool empty();
 
            // ----- Настройки  -----
            // неявно подразумевается, что всё настраивается до первого использования
            // ----------------------
            void setMaxSizeOfMessageQueue( size_t s ) noexcept;
            size_t getMaxSizeOfMessageQueue() const noexcept;
 
            enum LostStrategy
            {
                lostOldData, // default
                lostNewData
            };
 
            void setLostStrategy( LostStrategy s ) noexcept;
 
            // ---- Статистика ----
            inline size_t getMaxQueueMessages() const noexcept
            {
                return stMaxQueueMessages;
            }
 
            inline size_t getCountOfLostMessages() const noexcept
            {
                return stCountOfLostMessages;
            }
 
        protected:
 
        private:
 
            //typedef std::queue<VoidMessagePtr> MQueue;
            typedef std::deque<VoidMessagePtr> MQueue;
 
            MQueue mqueue;
            std::mutex qmutex;
 
            LostStrategy lostStrategy = { lostOldData };
 
            size_t SizeOfMessageQueue = { 2000 };
 
            // статистическая информация
            size_t stMaxQueueMessages = { 0 };    
            size_t stCountOfLostMessages = { 0 };    
    };
    // -------------------------------------------------------------------------
} // end of uniset namespace
//---------------------------------------------------------------------------
#endif
//---------------------------------------------------------------------------