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Diffstat (limited to 'src/monitor-lib/iostatus.cpp')
| -rw-r--r-- | src/monitor-lib/iostatus.cpp | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/src/monitor-lib/iostatus.cpp b/src/monitor-lib/iostatus.cpp new file mode 100644 index 00000000..1fada231 --- /dev/null +++ b/src/monitor-lib/iostatus.cpp @@ -0,0 +1,188 @@ +/**************************************************************************** +** +** Copyright (C) 2018 Pelagicore AG +** Contact: https://www.qt.io/licensing/ +** +** This file is part of the Pelagicore Application Manager. +** +** $QT_BEGIN_LICENSE:LGPL-QTAS$ +** Commercial License Usage +** Licensees holding valid commercial Qt Automotive Suite 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 The Qt Company. For +** licensing terms and conditions see https://www.qt.io/terms-conditions. +** For further information use the contact form at https://www.qt.io/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 3 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL3 included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 3 requirements +** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 2.0 or (at your option) the GNU General +** Public license version 3 or any later version approved by the KDE Free +** Qt Foundation. The licenses are as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 +** included in the packaging of this file. Please review the following +** information to ensure the GNU General Public License requirements will +** be met: https://www.gnu.org/licenses/gpl-2.0.html and +** https://www.gnu.org/licenses/gpl-3.0.html. +** +** $QT_END_LICENSE$ +** +** SPDX-License-Identifier: LGPL-3.0 +** +****************************************************************************/ + +#include "iostatus.h" + +#include <QFile> + +/*! + \qmltype IoStatus + \inqmlmodule QtApplicationManager + \ingroup common-instantiatable + \brief Provides information on the status of I/O devices. + + IoStatus provides information on the status of I/O devices. + Its property values are updated whenever the method update() is called. + + You can use this component as a MonitorModel data source if you want to plot its + previous values over time. + + \qml + import QtQuick 2.11 + import QtApplicationManager 1.0 + ... + MonitorModel { + IoStatus { + deviceNames: ["sda", "sdb"] + } + } + \endqml + + You can also use it alongside a Timer for instance, when you're only interested in its current value. + + \qml + import QtQuick 2.11 + import QtApplicationManager 1.0 + ... + IoStatus { + id: ioStatus + deviceNames: ["sda", "sdb"] + } + Timer { + interval: 500 + running: true + repeat: true + onTriggered: ioStatus.update() + } + Text { + property string loadPercent: Number(ioStatus.ioLoad.sda * 100).toLocaleString(Qt.locale("en_US"), 'f', 1) + text: "sda load: " + loadPercent + "%" + } + \endqml +*/ + +QT_USE_NAMESPACE_AM + +IoStatus::IoStatus(QObject *parent) + : QObject(parent) +{ +} + +IoStatus::~IoStatus() +{ + qDeleteAll(m_ioHash); +} + +/*! + \qmlproperty list<string> IoStatus::deviceNames + + Names of the I/O devices to be probed. + + \note Currently this is only supported on Linux: device names have to match to filenames in + the \c /sys/block directory. +*/ +QStringList IoStatus::deviceNames() const +{ + return m_deviceNames; +} + +void IoStatus::setDeviceNames(const QStringList &value) +{ + qDeleteAll(m_ioHash); + m_ioHash.clear(); + + m_deviceNames = value; + + for (auto it = m_deviceNames.cbegin(); it != m_deviceNames.cend(); ++it) + addIoReader(*it); + + emit deviceNamesChanged(); +} + +/*! + \qmlproperty var IoStatus::ioLoad + \readonly + + A map of devices registered in deviceNames and their corresponding I/O loads in the + range [0, 1]. For instance the load of a device named "sda" can be accessed through + \c ioLoad.sda. + + Devices whose status could not be fetched won't be present in this property. + + The value of this property is updated when update() is called. + + \sa update +*/ +QVariantMap IoStatus::ioLoad() const +{ + return m_ioLoad; +} + +/*! + \qmlproperty list<string> IoStatus::roleNames + \readonly + + Names of the roles provided by IoStatus when used as a MonitorModel data source. + + \sa MonitorModel +*/ +QStringList IoStatus::roleNames() const +{ + return { qSL("ioLoad") }; +} + +/*! + \qmlmethod IoStatus::update + + Updates the ioLoad property. + + \sa ioLoad +*/ +void IoStatus::update() +{ + m_ioLoad.clear(); + for (auto it = m_ioHash.cbegin(); it != m_ioHash.cend(); ++it) { + qreal ioVal = it.value()->readLoadValue(); + m_ioLoad.insert(it.key(), ioVal); + } + emit ioLoadChanged(); +} + +void IoStatus::addIoReader(const QString &deviceName) +{ + if (!QFile::exists(qSL("/dev/") + deviceName)) + return; + if (m_ioHash.contains(deviceName)) + return; + + IoReader *ior = new IoReader(deviceName.toLocal8Bit().constData()); + m_ioHash.insert(deviceName, ior); +} |