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abstractdbusservicemonitor.cpp
/*
* Copyright (C) 2011-2014 Canonical Ltd.
*
* Authors:
* Ugo Riboni <ugo.riboni@canonical.com>
*
* 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; version 3.
*
* 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 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 "abstractdbusservicemonitor.h"
#include <QDBusInterface>
#include <QDBusServiceWatcher>
#include <QDBusConnection>
#include <QDBusConnectionInterface>
#include <QDBusReply>
AbstractDBusServiceMonitor::AbstractDBusServiceMonitor(const QString &service, const QString &path,
const QString &interface, const Bus bus,
QObject *parent)
: QObject(parent)
, m_service(service)
, m_path(path)
, m_interface(interface)
, m_bus(bus)
, m_watcher(new QDBusServiceWatcher(service,
(bus == SystemBus) ? QDBusConnection::systemBus()
: QDBusConnection::sessionBus()))
, m_dbusInterface(nullptr)
{
connect(m_watcher, &QDBusServiceWatcher::serviceRegistered, this, &AbstractDBusServiceMonitor::onServiceRegistered);
connect(m_watcher, &QDBusServiceWatcher::serviceUnregistered, this, &AbstractDBusServiceMonitor::onServiceUnregistered);
// Connect to the service if it's up already
QDBusConnectionInterface* sessionBus = QDBusConnection::sessionBus().interface();
QDBusReply<bool> reply = sessionBus->isServiceRegistered(m_service);
if (reply.isValid() && reply.value()) {
onServiceRegistered(m_service);
}
}
AbstractDBusServiceMonitor::~AbstractDBusServiceMonitor()
{
delete m_watcher;
delete m_dbusInterface;
}
void AbstractDBusServiceMonitor::onServiceRegistered(const QString &)
{
if (m_dbusInterface != nullptr) {
delete m_dbusInterface;
m_dbusInterface = nullptr;
}
m_dbusInterface = createInterface(m_service, m_path, m_interface,
(m_bus == SystemBus) ? QDBusConnection::systemBus()
: QDBusConnection::sessionBus());
Q_EMIT serviceAvailableChanged(true);
}
/*
* Default implementation creates a QDBusInterface. This performs blocking introspection of the
* service at initialization, which may be undesirable if the service is slow/blocked.
*/
QDBusAbstractInterface*
AbstractDBusServiceMonitor::createInterface(const QString &service, const QString &path,
const QString &interface, const QDBusConnection &connection)
{
return new QDBusInterface(service, path, interface, connection);
}
void AbstractDBusServiceMonitor::onServiceUnregistered(const QString &)
{
if (m_dbusInterface != nullptr) {
delete m_dbusInterface;
m_dbusInterface = nullptr;
}
Q_EMIT serviceAvailableChanged(false);
}
QDBusAbstractInterface* AbstractDBusServiceMonitor::dbusInterface() const
{
return m_dbusInterface;
}
bool AbstractDBusServiceMonitor::serviceAvailable() const
{
return m_dbusInterface != nullptr;
}