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/*
* Copyright (C) 2008, 2009 Nokia Corporation.
*
* Contact: Marius Vollmer <marius.vollmer@nokia.com>
*
* This library 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 library 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 library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
*/
#ifndef PROVIDER_H
#define PROVIDER_H
#include "queuedinvoker.h"
#include "contextproviderinfo.h"
#include "timedvalue.h"
#include <QObject>
#include <QDBusConnection>
#include <QSet>
#include <QMutex>
class ContextPropertyInfo;
namespace ContextSubscriber {
class PropertyHandle;
class SubscriberInterface;
class DBusNameListener;
class ManagerInterface;
class IProviderPlugin;
class Provider : public QueuedInvoker
{
Q_OBJECT
public:
static Provider* instance(const ContextProviderInfo& providerInfo);
bool subscribe(const QString &key);
void unsubscribe(const QString &key);
TimedValue get(const QString &key) const;
void clearValues();
Q_SIGNALS:
void subscribeFinished(Provider *provider, QString key);
void valueChanged(QString key);
private Q_SLOTS:
void onPluginReady();
void onPluginFailed(QString error);
void onPluginSubscribeFinished(QString key);
void onPluginSubscribeFinished(QString key, TimedValue value);
void onPluginSubscribeFailed(QString failedKey, QString error);
void onPluginValueChanged(QString key, QVariant newValue);
void onPluginValueChanged(QString key, TimedValue newValue);
private:
enum PluginState { INITIALIZING, READY, FAILED };
Provider(const ContextProviderInfo& providerInfo);
Q_INVOKABLE void handleSubscribes();
Q_INVOKABLE void constructPlugin();
void signalSubscribeFinished(QString key);
IProviderPlugin* plugin; ///< Plugin instance communicating with the concrete provider.
PluginState pluginState;
ContextProviderInfo providerInfo; ///< Parameters used to initialize the plugin.
QMutex subscribeLock;
QSet<QString> toSubscribe; ///< Keys pending for subscription
QSet<QString> toUnsubscribe; ///< Keys pending for unsubscription
// FIXME: rename this to something which contains the word intention in it
QSet<QString> subscribedKeys; ///< The keys that should be currently subscribed to
QMap<QString, TimedValue> values; ///< A cache of values already received from the plugin
};
} // end namespace
#endif
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