devel/libmdw/trunk/libmdw/src/QueueManager.h

/***************************************************************************
 *   Copyright (C) 2010 by Jean-Baptiste Wons   *
 *   wonsjb@gmail.com   *
 *                                                                         *
 *   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; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 ***************************************************************************/
#ifndef MDWQUEUEMANAGER_H
#define MDWQUEUEMANAGER_H

#include <string>
#include <set>

namespace mdw
{
class QueueManager;
class QueueImpl
{
    virtual void * dequeue() = 0;
    virtual void enqueue (void *) = 0;
    virtual int count() = 0;
};

template <class T>
class Queue
{
public:
    const std::string &getName()
    {
        return _name;
    }
    T* dequeue()
    {
        return (T*) _impl->dequeue();
    }
    void enqueue (T& t)
    {
        return _impl->enqueue ( (void*) &t);
    }
    int getSize()
    {
        return _size;
    }
    int count()
    {
        return _impl->count();
    }
    friend class QueueManager;
private:
    std::string _name;
    int _size;
    QueueImpl * _impl;
};

class QueueManager
{
public:
    typedef enum { One_e, Several_e } Cardinal_t;
    static void initialise();
    static QueueManager &getInstance();

    template <class T>
    Queue<T> createQueue (int size, const std::string &name, Cardinal_t producer,
                          Cardinal_t consumer, bool lockFree)
    {
        Queue<T> aQueue;
        aQueue.name = name;
        aQueue._size = size;
        aQueue._impl = createInternal (size, name, producer,
                                       consumer, lockFree);
    }
    template <class T>
    void deleteQueue (Queue<T> &queue)
    {
        destroyInternal (queue._impl);
    }

private:
    std::set<QueueImpl *> _queues;
    static QueueManager * _instance;
    void init();

    QueueImpl * createInternal (int size, const std::string &name, Cardinal_t producer,
                                Cardinal_t consumer, bool lockFree);
    void destroyInternal (QueueImpl *queue);

    QueueManager();

    ~QueueManager();

};

}

#endif

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