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/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the test suite of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
** General Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QtTest/QtTest>
#include <qcoreapplication.h>
#include <qobject.h>
class tst_QObjectPerformance : public QObject
{
Q_OBJECT
public:
private slots:
void emitToManyReceivers();
};
class SimpleSenderObject : public QObject
{
Q_OBJECT
signals:
void signal();
public:
void emitSignal()
{
emit signal();
}
};
class SimpleReceiverObject : public QObject
{
Q_OBJECT
public slots:
void slot()
{
}
};
void tst_QObjectPerformance::emitToManyReceivers()
{
// ensure that emission times remain mostly linear as the number of receivers increase
SimpleSenderObject sender;
int elapsed = 0;
const int increase = 3000;
const int base = 5000;
for (int i = 0; i < 4; ++i) {
const int size = base + i * increase;
const double increaseRatio = double(size) / (double)(size - increase);
QList<SimpleReceiverObject *> receivers;
for (int k = 0; k < size; ++k) {
SimpleReceiverObject *receiver = new SimpleReceiverObject;
QObject::connect(&sender, SIGNAL(signal()), receiver, SLOT(slot()));
receivers.append(receiver);
}
QTime timer;
timer.start();
sender.emitSignal();
int e = timer.elapsed();
if (elapsed > 1) {
qDebug() << size << "receivers, elapsed time" << e << "compared to previous time" << elapsed;
QVERIFY(double(e) / double(elapsed) <= increaseRatio * 2.0);
} else {
qDebug() << size << "receivers, elapsed time" << e << "cannot be compared to previous, unmeasurable time";
}
elapsed = e;
qDeleteAll(receivers);
receivers.clear();
}
}
QTEST_MAIN(tst_QObjectPerformance)
#include "tst_qobjectperformance.moc"
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