messagequeue.cpp

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// Copyright (C) 2015 F4EXB                                                      //
// written by Edouard Griffiths                                                  //
//                                                                               //
// 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 as version 3 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 V3 for more details.                               //
//                                                                               //
// You should have received a copy of the GNU General Public License             //
// along with this program. If not, see <http://www.gnu.org/licenses/>.          //

#include <QDebug>
#include <QMutexLocker>
#include "util/messagequeue.h"
#include "util/message.h"

MessageQueue::MessageQueue(QObject* parent) :
    QObject(parent),
    m_lock(QMutex::Recursive),
    m_queue()
{
}

MessageQueue::~MessageQueue()
{
    Message* message;

    while ((message = pop()) != 0)
    {
        qDebug() << "MessageQueue::~MessageQueue: message: " << message->getIdentifier() << " was still in queue";
        delete message;
    }
}

void MessageQueue::push(Message* message, bool emitSignal)
{
    if (message)
    {
        m_lock.lock();
        m_queue.append(message);
        m_lock.unlock();
    }

    if (emitSignal)
    {
        emit messageEnqueued();
    }
}

Message* MessageQueue::pop()
{
    QMutexLocker locker(&m_lock);

    if (m_queue.isEmpty())
    {
        return 0;
    }
    else
    {
        return m_queue.takeFirst();
    }
}

int MessageQueue::size()
{
    QMutexLocker locker(&m_lock);

    return m_queue.size();
}

void MessageQueue::clear()
{
    QMutexLocker locker(&m_lock);

    while (!m_queue.isEmpty()) {
        delete m_queue.takeFirst();
    }
}