queue-size.h

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/*
 * Copyright (c) 2018 Universita' degli Studi di Napoli Federico II
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation;
 *
 * 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
 *
 * Author: Stefano Avallone <stavallo@unina.it>
 */
 
#ifndef QUEUE_SIZE_H
#define QUEUE_SIZE_H
 
#include "ns3/abort.h"
#include "ns3/attribute-helper.h"
#include "ns3/attribute.h"
 
#include <iostream>
#include <string>
 
namespace ns3
{
 
enum QueueSizeUnit
{
    PACKETS, 
    BYTES,   
};
 
class QueueSize
{
  public:
    QueueSize();
    QueueSize(QueueSizeUnit unit, uint32_t value);
    QueueSize(std::string size);
 
    bool operator<(const QueueSize& rhs) const;
 
    bool operator<=(const QueueSize& rhs) const;
 
    bool operator>(const QueueSize& rhs) const;
 
    bool operator>=(const QueueSize& rhs) const;
 
    bool operator==(const QueueSize& rhs) const;
 
    bool operator!=(const QueueSize& rhs) const;
 
    QueueSizeUnit GetUnit() const;
 
    uint32_t GetValue() const;
 
  private:
    static bool DoParse(const std::string s, QueueSizeUnit* unit, uint32_t* value);
 
    // Uses DoParse
    friend std::istream& operator>>(std::istream& is, QueueSize& size);
 
    QueueSizeUnit m_unit; 
    uint32_t m_value;     
};
 
std::ostream& operator<<(std::ostream& os, const QueueSize& size);
 
std::istream& operator>>(std::istream& is, QueueSize& size);
 
ATTRIBUTE_HELPER_HEADER(QueueSize);
 
template <typename Item>
QueueSize operator+(const QueueSize& lhs, const Ptr<Item>& rhs);
template <typename Item>
QueueSize operator+(const Ptr<Item>& lhs, const QueueSize& rhs);
 
template <typename Item>
QueueSize operator-(const QueueSize& lhs, const Ptr<Item>& rhs);
template <typename Item>
QueueSize operator-(const Ptr<Item>& lhs, const QueueSize& rhs);
 
template <typename Item>
QueueSize
operator+(const QueueSize& lhs, const Ptr<Item>& rhs)
{
    if (lhs.GetUnit() == QueueSizeUnit::PACKETS)
    {
        return QueueSize(lhs.GetUnit(), lhs.GetValue() + 1);
    }
    if (lhs.GetUnit() == QueueSizeUnit::BYTES)
    {
        return QueueSize(lhs.GetUnit(), lhs.GetValue() + rhs->GetSize());
    }
    NS_FATAL_ERROR("Unknown queue size mode");
}
 
template <typename Item>
QueueSize
operator+(const Ptr<Item>& lhs, const QueueSize& rhs)
{
    if (rhs.GetUnit() == QueueSizeUnit::PACKETS)
    {
        return QueueSize(rhs.GetUnit(), rhs.GetValue() + 1);
    }
    if (rhs.GetUnit() == QueueSizeUnit::BYTES)
    {
        return QueueSize(rhs.GetUnit(), rhs.GetValue() + lhs->GetSize());
    }
    NS_FATAL_ERROR("Unknown queue size mode");
}
 
template <typename Item>
QueueSize
operator-(const QueueSize& lhs, const Ptr<Item>& rhs)
{
    if (lhs.GetUnit() == QueueSizeUnit::PACKETS)
    {
        NS_ABORT_IF(lhs.GetValue() < 1);
        return QueueSize(lhs.GetUnit(), lhs.GetValue() - 1);
    }
    if (lhs.GetUnit() == QueueSizeUnit::BYTES)
    {
        NS_ABORT_IF(lhs.GetValue() < rhs->GetSize());
        return QueueSize(lhs.GetUnit(), lhs.GetValue() - rhs->GetSize());
    }
    NS_FATAL_ERROR("Unknown queue size mode");
}
 
template <typename Item>
QueueSize
operator-(const Ptr<Item>& lhs, const QueueSize& rhs)
{
    if (rhs.GetUnit() == QueueSizeUnit::PACKETS)
    {
        NS_ABORT_IF(rhs.GetValue() < 1);
        return QueueSize(rhs.GetUnit(), rhs.GetValue() - 1);
    }
    if (rhs.GetUnit() == QueueSizeUnit::BYTES)
    {
        NS_ABORT_IF(rhs.GetValue() < lhs->GetSize());
        return QueueSize(rhs.GetUnit(), rhs.GetValue() - lhs->GetSize());
    }
    NS_FATAL_ERROR("Unknown queue size mode");
}
 
} // namespace ns3
 
#endif /* QUEUE_SIZE_H */