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/*
* Copyright (C) 2008, 2009 Nokia Corporation.
*
* Contact: Marius Vollmer <marius.vollmer@nokia.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* version 2.1 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 warranty of
* MERCHANTABILITY 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, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
*/
#include "propertyadaptor.h"
#include "logging.h"
#include "sconnect.h"
#include "propertyprivate.h"
#include <QDBusConnection>
namespace ContextProvider {
/*!
\class PropertyAdaptor
\brief A DBus adaptor for implementing the org.maemo.contextkit.Property
PropertyAdaptor represents the Property object on D-Bus. It also
keeps track of its clients and sets the PropertyPrivate to
subscribed or unsubscribed accordingly.
PropertyAdaptor also listens to values sent by other providers on
D-Bus and notifies the PropertyPrivate about them.
*/
/// Constructor. Creates new adaptor for the given manager with the given
/// dbus connection. The connection \a conn is not retained.
PropertyAdaptor::PropertyAdaptor(PropertyPrivate* propertyPrivate, QDBusConnection *conn)
: QDBusAbstractAdaptor(propertyPrivate), propertyPrivate(propertyPrivate), connection(conn)
{
// Start listening to the QDBusServiceWathcer, to know when our client has
// exited.
sconnect(&serviceWatcher, SIGNAL(serviceUnregistered(const QString&)),
this, SLOT(onClientExited(const QString&)));
serviceWatcher.setConnection(*conn);
sconnect(propertyPrivate, SIGNAL(valueChanged(const QVariantList&, const quint64&)),
this, SIGNAL(ValueChanged(const QVariantList&, const quint64&)));
// Start listening to ValueChanged signals. We only listen to the
// same bus we're on: that means if the same property is provided
// both on session and on system bus, overhearing won't work.
connection->connect("", objectPath(), DBUS_INTERFACE, "ValueChanged",
this, SLOT(onValueChanged(QVariantList, quint64)));
}
/// Implementation of the D-Bus method Subscribe
void PropertyAdaptor::Subscribe(const QDBusMessage &msg, QVariantList& values, quint64& timestamp)
{
contextDebug() << "Subscribe called";
// Store the information of the subscription. For each client, we
// record how many times the client has subscribed.
QString client = msg.service();
if (clientServiceNames.contains(client) == false) {
clientServiceNames.insert(client);
if (clientServiceNames.size() == 1) {
propertyPrivate->setSubscribed();
}
serviceWatcher.addWatchedService(client);
}
else {
contextWarning() << "Client" << client << "subscribed to property" << propertyPrivate->key << "multiple times";
QDBusMessage error = msg.createErrorReply("org.maemo.contextkit.Error.MultipleSubscribe",
"Subscribing to " + propertyPrivate->key + " multiple times");
connection->send(error);
}
// Construct the return values
Get(values, timestamp);
}
/// Implementation of the D-Bus method Unsubscribe
void PropertyAdaptor::Unsubscribe(const QDBusMessage &msg)
{
contextDebug() << "Unsubscribe called";
QString client = msg.service();
if (clientServiceNames.remove(client)) {
if (clientServiceNames.size() == 0) {
propertyPrivate->setUnsubscribed();
}
serviceWatcher.removeWatchedService(client);
}
else {
contextWarning() << "Client" << client << "unsubscribed from property" <<
propertyPrivate->key << "without subscribing";
QDBusMessage error = msg.createErrorReply("org.maemo.contextkit.Error.IllegalUnsubscribe",
"Unsubscribing from a non-subscribed property "
+ propertyPrivate->key);
connection->send(error);
}
}
/// Implementation of the D-Bus method Get.
void PropertyAdaptor::Get(QVariantList& values, quint64& timestamp)
{
// Construct the return values
if (propertyPrivate->value.isNull() == false) {
values << propertyPrivate->value;
}
timestamp = propertyPrivate->timestamp;
}
/// Called when a ValueChanged signal is overheard on D-Bus. Command
/// PropertyPrivate to update its overheard value.
void PropertyAdaptor::onValueChanged(QVariantList values, quint64 timestamp)
{
propertyPrivate->updateOverheardValue(values, timestamp);
}
/// Called when the DBusServiceWatcher signals that one of our clients has
/// exited D-Bus.
void PropertyAdaptor::onClientExited(const QString& busName)
{
if (clientServiceNames.remove(busName) && clientServiceNames.size() == 0) {
propertyPrivate->setUnsubscribed();
}
// The client is expected to re-subscribe if it comes back. Then we will
// start watching it again.
serviceWatcher.removeWatchedService(busName);
}
/// Object path where the corresponding PropertyPrivate object should
/// be registered at. For a core propertiy Property.Name (not starting
/// with /), the path is /org/maemo/contextkit/Property/Name. For a
/// non-core property /com/my/property, the object path is
/// /com/my/property.
QString PropertyAdaptor::objectPath() const
{
if (propertyPrivate->key.startsWith("/"))
return QString(propertyPrivate->key);
return QString("/org/maemo/contextkit/") +
QString(propertyPrivate->key).replace(".", "/").replace(QRegExp("[^A-Za-z0-9_/]"), "_");
}
/// Called when the service is stopped and will disappear from
/// D-Bus. If it appears again, the clients will resubscribe, and it
/// shouldn't be a MultipleSubscribe error. Thus, we need to forget
/// the clients when the service is stopped.
void PropertyAdaptor::forgetClients()
{
foreach(const QString& client, clientServiceNames)
serviceWatcher.removeWatchedService(client);
clientServiceNames.clear();
propertyPrivate->setUnsubscribed();
}
} // namespace ContextProvider
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