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/*
* Copyright 2013 Canonical Ltd.
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU 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 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/>.
*
* Authors:
* Charles Kerr <charles.kerr@canonical.com>
*/
#ifndef INDICATOR_DATETIME_CLOCK_H
#define INDICATOR_DATETIME_CLOCK_H
#include <datetime/date-time.h>
#include <core/property.h>
#include <core/signal.h>
#include <gio/gio.h> // GDBusConnection
#include <memory> // std::shared_ptr, std::unique_ptr
namespace unity {
namespace indicator {
namespace datetime {
/**
* \brief A clock.
*
* Provides a signal to notify when clock skew is detected, such as
* when the timezone changes or when the system resumes from sleep.
*/
class Clock
{
public:
virtual ~Clock();
virtual DateTime localtime() const =0;
core::Signal<> skewDetected;
core::Signal<> dateChanged;
protected:
Clock();
private:
static void onSystemBusReady(GObject*, GAsyncResult*, gpointer);
static void onPrepareForSleep(GDBusConnection*, const gchar*, const gchar*, const gchar*, const gchar*, GVariant*, gpointer);
GCancellable * m_cancellable = nullptr;
GDBusConnection * m_system_bus = nullptr;
unsigned int m_sleep_subscription_id = 0;
// we've got raw pointers and GSignal tags in here, so disable copying
Clock(const Clock&) =delete;
Clock& operator=(const Clock&) =delete;
};
/***
****
***/
class Timezones;
/**
* \brief A live clock that provides the actual system time.
*
* This subclass also adds another clock skew detection test:
* it wakes up every skewTestIntervalSec seconds to see how
* much time has passed since the last wakeup. If the answer
* isn't what it expected, the skewDetected signal is triggered.
*/
class LiveClock: public Clock
{
public:
LiveClock (const std::shared_ptr<Timezones>& zones);
virtual ~LiveClock();
virtual DateTime localtime() const;
core::Property<unsigned int> skewTestIntervalSec;
private:
class Impl;
std::unique_ptr<Impl> p;
};
/***
****
***/
} // namespace datetime
} // namespace indicator
} // namespace unity
#endif // INDICATOR_DATETIME_CLOCK_H
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