1 files changed, 99 insertions, 0 deletions
diff --git a/include/datetime/clock.h b/include/datetime/clock.h
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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/timezones.h>
+
+#include <core/property.h>
+#include <core/signal.h>
+
+#include <glib.h>
+#include <gio/gio.h>
+
+#include <set>
+#include <string>
+
+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 GDateTime* localtime() const = 0;
+    core::Property<std::set<std::string> > timezones;
+    core::Signal<> skewDetected;
+
+protected:
+    Clock();
+
+private:
+    static void onSystemBusReady(GObject*, GAsyncResult*, gpointer);
+    static void onPrepareForSleep(GDBusConnection*, const gchar*, const gchar*, const gchar*, const gchar*, GVariant*, gpointer);
+
+    Clock(const Clock&) =delete;
+    Clock& operator=(const Clock&) =delete;
+
+    GCancellable * cancellable_ = nullptr;
+    GDBusConnection * system_bus_ = nullptr;
+    unsigned int sleep_subscription_id_ = 0;
+};
+
+/***
+****
+***/
+
+/**
+ * \brief A live clock that provides the actual system time.
+ *
+ * Adds another clock skew detection test: wakes up every
+ * skewTestIntervalSec seconds to see how much time has passed
+ * since the last time it checked.
+ */
+class LiveClock: public Clock
+{
+public:
+    LiveClock (const std::shared_ptr<Timezones>& zones);
+    virtual ~LiveClock();
+    virtual GDateTime* 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