src/dbus/qdbusservicewatcher.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Wed, 18 Aug 2010 10:37:55 +0300
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/****************************************************************************
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**
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the QtDBus module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** No Commercial Usage
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** This file contains pre-release code and may not be distributed.
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** You may use this file in accordance with the terms and conditions
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** contained in the Technology Preview License Agreement accompanying
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** this package.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file.  Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights.  These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** If you have questions regarding the use of this file, please contact
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** Nokia at qt-info@nokia.com.
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**
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**
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**
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**
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**
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**
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "qdbusservicewatcher.h"
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#include "qdbusconnection.h"
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#include "qdbus_symbols_p.h"
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#include <QStringList>
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#include <private/qobject_p.h>
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#ifndef QT_NO_DBUS
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QT_BEGIN_NAMESPACE
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Q_GLOBAL_STATIC_WITH_ARGS(QString, busService, (QLatin1String(DBUS_SERVICE_DBUS)))
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Q_GLOBAL_STATIC_WITH_ARGS(QString, busInterface, (QLatin1String(DBUS_INTERFACE_DBUS)))
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Q_GLOBAL_STATIC_WITH_ARGS(QString, signalName, (QLatin1String("NameOwnerChanged")))
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class QDBusServiceWatcherPrivate: public QObjectPrivate
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{
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    Q_DECLARE_PUBLIC(QDBusServiceWatcher)
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public:
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    QDBusServiceWatcherPrivate(const QDBusConnection &c, QDBusServiceWatcher::WatchMode wm)
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        : connection(c), watchMode(wm)
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    {
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    }
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    QStringList servicesWatched;
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    QDBusConnection connection;
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    QDBusServiceWatcher::WatchMode watchMode;
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    void _q_serviceOwnerChanged(const QString &, const QString &, const QString &);
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    void setConnection(const QStringList &services, const QDBusConnection &c, QDBusServiceWatcher::WatchMode watchMode);
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    QStringList matchArgsForService(const QString &service);
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    void addService(const QString &service);
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    void removeService(const QString &service);
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};
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void QDBusServiceWatcherPrivate::_q_serviceOwnerChanged(const QString &service, const QString &oldOwner, const QString &newOwner)
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{
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    Q_Q(QDBusServiceWatcher);
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    emit q->serviceOwnerChanged(service, oldOwner, newOwner);
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    if (oldOwner.isEmpty())
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        emit q->serviceRegistered(service);
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    else if (newOwner.isEmpty())
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        emit q->serviceUnregistered(service);
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}
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void QDBusServiceWatcherPrivate::setConnection(const QStringList &s, const QDBusConnection &c, QDBusServiceWatcher::WatchMode wm)
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{
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    if (connection.isConnected()) {
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        // remove older rules
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        foreach (const QString &s, servicesWatched)
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            removeService(s);
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    }
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    connection = c;
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    watchMode = wm;
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    servicesWatched = s;
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    if (connection.isConnected()) {
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        // add new rules
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        foreach (const QString &s, servicesWatched)
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            addService(s);
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    }
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}
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QStringList QDBusServiceWatcherPrivate::matchArgsForService(const QString &service)
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{
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    QStringList matchArgs;
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    matchArgs << service;
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    switch (watchMode) {
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    case QDBusServiceWatcher::WatchForOwnerChange:
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        break;
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    case QDBusServiceWatcher::WatchForRegistration:
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        matchArgs << QString::fromLatin1("", 0);
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        break;
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    case QDBusServiceWatcher::WatchForUnregistration:
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        matchArgs << QString() << QString::fromLatin1("", 0);
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        break;
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    }
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    return matchArgs;
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}
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void QDBusServiceWatcherPrivate::addService(const QString &service)
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{
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    QStringList matchArgs = matchArgsForService(service);
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    connection.connect(*busService(), QString(), *busInterface(), *signalName(),
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                       matchArgs, QString(), q_func(),
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                       SLOT(_q_serviceOwnerChanged(QString,QString,QString)));
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}
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void QDBusServiceWatcherPrivate::removeService(const QString &service)
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{
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    QStringList matchArgs = matchArgsForService(service);
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    connection.disconnect(*busService(), QString(), *busInterface(), *signalName(),
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                          matchArgs, QString(), q_func(),
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                          SLOT(_q_serviceOwnerChanged(QString,QString,QString)));
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}
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/*!
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    \class QDBusServiceWatcher
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    \since 4.6
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    \inmodule QtDBus
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    \brief The QDBusServiceWatcher class allows the user to watch for a bus service change.
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    A QDBusServiceWatcher object can be used to notify the application about
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    an ownership change of a service name on the bus. It has three watch
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    modes:
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    \list
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      \o Watching for service registration only.
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      \o Watching for service unregistration only.
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      \o Watching for any kind of service ownership change (the default mode).
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    \endlist
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    Besides being created or deleted, services may change owners without a
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    unregister/register operation happening. So the serviceRegistered()
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    and serviceUnregistered() signals may not be emitted if that
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    happens.
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    This class is more efficient than using the
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    QDBusConnectionInterface::serviceOwnerChanged() signal because it allows
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    one to receive only the signals for which the class is interested in.
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    \sa QDBusConnection
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*/
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/*!
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    \enum QDBusServiceWatcher::WatchModeFlag
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    QDBusServiceWatcher supports three different watch modes, which are configured by this flag:
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    \value WatchForRegistration watch for service registration only, ignoring
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    any signals related to other service ownership change.
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    \value WatchForUnregistration watch for service unregistration only,
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    ignoring any signals related to other service ownership change.
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    \value WatchForOwnerChange watch for any kind of service ownership
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    change.
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*/
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/*!
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    \property QDBusServiceWatcher::watchMode
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    The \c watchMode property holds the current watch mode for this
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    QDBusServiceWatcher object. The default value for this property is
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    QDBusServiceWatcher::WatchForOwnershipChange.
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*/
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/*!
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    \property QDBusServiceWatcher::watchedServices
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    The \c servicesWatched property holds the list of services watched.
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    Note that modifying this list with setServicesWatched() is an expensive
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    operation. If you can, prefer to change it by way of addWatchedService()
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    and removeWatchedService().
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*/
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/*!
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    \fn void QDBusServiceWatcher::serviceRegistered(const QString &serviceName)
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    This signal is emitted whenever this object detects that the service \a
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    serviceName became available on the bus.
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    \sa serviceUnregistered(), serviceOwnerChanged()
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*/
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/*!
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    \fn void QDBusServiceWatcher::serviceUnregistered(const QString &serviceName)
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    This signal is emitted whenever this object detects that the service \a
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    serviceName was unregistered from the bus and is no longer available.
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    \sa serviceRegistered(), serviceOwnerChanged()
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*/
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/*!
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    \fn void QDBusServiceWatcher::serviceOwnerChanged(const QString &serviceName, const QString &oldOwner, const QString &newOwner)
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    This signal is emitted whenever this object detects that there was a
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    service ownership change relating to the \a serviceName service. The \a
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    oldOwner parameter contains the old owner name and \a newOwner is the new
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    owner. Both \a oldOwner and \a newOwner are unique connection names.
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    Note that this signal is also emitted whenever the \a serviceName service
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    was registered or unregistered. If it was registered, \a oldOwner will
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    contain an empty string, whereas if it was unregistered, \a newOwner will
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    contain an empty string.
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    If you need only to find out if the service is registered or unregistered
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    only, without being notified that the ownership changed, consider using
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    the specific modes for those operations. This class is more efficient if
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    you use the more specific modes.
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    \sa serviceRegistered(), serviceUnregistered()
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*/
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/*!
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    Creates a QDBusServiceWatcher object. Note that until you set a
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    connection with setConnection(), this object will not emit any signals.
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    The \a parent parameter is passed to QObject to set the parent of this
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    object.
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*/
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QDBusServiceWatcher::QDBusServiceWatcher(QObject *parent)
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    : QObject(*new QDBusServiceWatcherPrivate(QDBusConnection(QString()), WatchForOwnerChange), parent)
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{
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}
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/*!
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    Creates a QDBusServiceWatcher object and attaches it to the \a connection
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    connection. Also, this function immediately starts watching for \a
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    watchMode changes to service \a service.
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    The \a parent parameter is passed to QObject to set the parent of this
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    object.
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*/
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QDBusServiceWatcher::QDBusServiceWatcher(const QString &service, const QDBusConnection &connection, WatchMode watchMode, QObject *parent)
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    : QObject(*new QDBusServiceWatcherPrivate(connection, watchMode), parent)
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{
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    d_func()->setConnection(QStringList() << service, connection, watchMode);
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}
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/*!
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    Destroys the QDBusServiceWatcher object and releases any resources
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    associated with it.
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*/
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QDBusServiceWatcher::~QDBusServiceWatcher()
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{
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}
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/*!
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    Returns the list of D-Bus services that are being watched.
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    \sa setWatchedServices()
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*/
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QStringList QDBusServiceWatcher::watchedServices() const
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{
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    return d_func()->servicesWatched;
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}
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/*!
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    Sets the list of D-Bus services being watched to be \a services.
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    Note that setting the entire list means removing all previous rules for
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    watching services and adding new ones. This is an expensive operation and
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    should be avoided, if possible. Instead, use addWatchedService() and
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    removeWatchedService() if you can to manipulate entries in the list.
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*/
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void QDBusServiceWatcher::setWatchedServices(const QStringList &services)
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{
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    Q_D(QDBusServiceWatcher);
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    if (services == d->servicesWatched)
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        return;
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    d->setConnection(services, d->connection, d->watchMode);
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}
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/*!
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    Adds \a newService to the list of services to be watched by this object.
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    This function is more efficient than setWatchedServices() and should be
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    used whenever possible to add services.
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*/
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void QDBusServiceWatcher::addWatchedService(const QString &newService)
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{
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    Q_D(QDBusServiceWatcher);
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    if (d->servicesWatched.contains(newService))
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        return;
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    d->addService(newService);
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    d->servicesWatched << newService;
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}
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/*!
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    Removes the \a service from the list of services being watched by this
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    object. Note that D-Bus notifications are asynchronous, so there may
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    still be signals pending delivery about \a service. Those signals will
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    still be emitted whenever the D-Bus messages are processed.
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    This function returns true if any services were removed.
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*/
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bool QDBusServiceWatcher::removeWatchedService(const QString &service)
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{
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    Q_D(QDBusServiceWatcher);
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    d->removeService(service);
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    return d->servicesWatched.removeOne(service);
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}
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   333
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QDBusServiceWatcher::WatchMode QDBusServiceWatcher::watchMode() const
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{
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    return d_func()->watchMode;
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}
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   338
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void QDBusServiceWatcher::setWatchMode(WatchMode mode)
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{
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    Q_D(QDBusServiceWatcher);
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    if (mode == d->watchMode)
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        return;
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    d->setConnection(d->servicesWatched, d->connection, mode);
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}
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/*!
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    Returns the QDBusConnection that this object is attached to.
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    \sa setConnection()
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*/
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QDBusConnection QDBusServiceWatcher::connection() const
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{
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    return d_func()->connection;
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}
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/*!
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    Sets the D-Bus connection that this object is attached to be \a
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    connection. All services watched will be transferred to this connection.
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    Note that QDBusConnection objects are reference counted:
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    QDBusServiceWatcher will keep a reference for this connection while it
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    exists. The connection is not closed until the reference count drops to
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    zero, so this will ensure that any notifications are received while this
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    QDBusServiceWatcher object exists.
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    \sa connection()
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*/
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void QDBusServiceWatcher::setConnection(const QDBusConnection &connection)
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{
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    Q_D(QDBusServiceWatcher);
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    if (connection.name() == d->connection.name())
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        return;
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    d->setConnection(d->servicesWatched, connection, d->watchMode);
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}
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QT_END_NAMESPACE
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30
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#endif // QT_NO_DBUS
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3
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#include "moc_qdbusservicewatcher.cpp"