qt5base-lts/tests/auto/other/qobjectperformance/tst_qobjectperformance.cpp
Iikka Eklund be15856f61 Change copyrights from Nokia to Digia
Change copyrights and license headers from Nokia to Digia

Change-Id: If1cc974286d29fd01ec6c19dd4719a67f4c3f00e
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
Reviewed-by: Sergio Ahumada <sergio.ahumada@digia.com>
2012-09-22 19:20:11 +02:00

124 lines
3.7 KiB
C++

/****************************************************************************
**
** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the test suite of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, 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, Digia gives you certain additional
** rights. These rights are described in the Digia 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.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#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"