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/*
* Copyright (C) 2011-2015 Canonical, Ltd.
*
* This program is free software: you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License version 3, as published by
* the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranties of MERCHANTABILITY,
* SATISFACTORY QUALITY, or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser 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>
// On construction QDBusInterface synchronously introspects the service, which will block the GUI
// thread if the service is busy. QDBusAbstractInterface does not perform this introspection, so
// let's subclass that and avoid the blocking scenario.
class AsyncDBusInterface : public QDBusAbstractInterface
{
public:
AsyncDBusInterface(const QString &service, const QString &path,
const QString &interface, const QDBusConnection &connection,
QObject *parent = 0)
: QDBusAbstractInterface(service, path, interface.toLatin1().data(), connection, parent)
{}
~AsyncDBusInterface() = default;
};
AbstractDBusServiceMonitor::AbstractDBusServiceMonitor(const QString &service, const QString &path,
const QString &interface, const QDBusConnection &connection,
QObject *parent)
: QObject(parent)
, m_service(service)
, m_path(path)
, m_interface(interface)
, m_busConnection(connection)
, m_watcher(new QDBusServiceWatcher(service, m_busConnection))
, m_dbusInterface(nullptr)
{
connect(m_watcher, &QDBusServiceWatcher::serviceRegistered, this, &AbstractDBusServiceMonitor::createInterface);
connect(m_watcher, &QDBusServiceWatcher::serviceUnregistered, this, &AbstractDBusServiceMonitor::destroyInterface);
// Connect to the service if it's up already
QDBusConnectionInterface* sessionBus = m_busConnection.interface();
QDBusReply<bool> reply = sessionBus->isServiceRegistered(m_service);
if (reply.isValid() && reply.value()) {
createInterface(m_service);
}
}
AbstractDBusServiceMonitor::~AbstractDBusServiceMonitor()
{
delete m_watcher;
delete m_dbusInterface;
}
void AbstractDBusServiceMonitor::createInterface(const QString &)
{
if (m_dbusInterface != nullptr) {
delete m_dbusInterface;
m_dbusInterface = nullptr;
}
m_dbusInterface = new AsyncDBusInterface(m_service, m_path, m_interface, m_busConnection);
Q_EMIT serviceAvailableChanged(true);
}
void AbstractDBusServiceMonitor::destroyInterface(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;
}
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