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+/****************************************************************************
+**
+** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the Qt Mobility Components.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef FREQUENCYMONITOR_H
+#define FREQUENCYMONITOR_H
+
+#include <QtCore/QObject>
+#include <QtCore/QTimer>
+
+class FrequencyMonitorPrivate;
+
+/**
+ * Class for measuring frequency of events
+ *
+ * Occurrence of the event is notified by the client via the notify() slot.
+ * On a regular interval, both an instantaneous and a rolling average
+ * event frequency are calculated.
+ */
+class FrequencyMonitor : public QObject
+{
+    Q_OBJECT
+    Q_DECLARE_PRIVATE(FrequencyMonitor)
+    Q_PROPERTY(QString label READ label WRITE setLabel NOTIFY labelChanged)
+    Q_PROPERTY(bool active READ active WRITE setActive NOTIFY activeChanged)
+    Q_PROPERTY(int samplingInterval READ samplingInterval WRITE setSamplingInterval NOTIFY samplingIntervalChanged)
+    Q_PROPERTY(int traceInterval READ traceInterval WRITE setTraceInterval NOTIFY traceIntervalChanged)
+    Q_PROPERTY(qreal instantaneousFrequency READ instantaneousFrequency NOTIFY instantaneousFrequencyChanged)
+    Q_PROPERTY(qreal averageFrequency READ averageFrequency NOTIFY averageFrequencyChanged)
+public:
+    FrequencyMonitor(QObject *parent = 0);
+    ~FrequencyMonitor();
+
+    static void qmlRegisterType();
+
+    const QString &label() const;
+    bool active() const;
+    int samplingInterval() const;
+    int traceInterval() const;
+    qreal instantaneousFrequency() const;
+    qreal averageFrequency() const;
+
+signals:
+    void labelChanged(const QString &value);
+    void activeChanged(bool);
+    void samplingIntervalChanged(int value);
+    void traceIntervalChanged(int value);
+    void frequencyChanged();
+    void instantaneousFrequencyChanged(qreal value);
+    void averageFrequencyChanged(qreal value);
+
+public slots:
+    Q_INVOKABLE void notify();
+    Q_INVOKABLE void trace();
+    void setActive(bool value);
+    void setLabel(const QString &value);
+    void setSamplingInterval(int value);
+    void setTraceInterval(int value);
+
+private:
+    FrequencyMonitorPrivate *d_ptr;
+};
+
+#endif // FREQUENCYMONITOR_H