add clock + tests

1 files changed, 137 insertions, 0 deletions

diff --git a/src/clock-live.cpp b/src/clock-live.cpp
new file mode 100644
index 0000000..80e91a3
--- /dev/null
+++ b/src/clock-live.cpp
@@ -0,0 +1,137 @@
+/*
+ * 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>
+ */
+
+#include <datetime/clock.h>
+
+namespace unity {
+namespace indicator {
+namespace datetime {
+
+class LiveClock::Impl
+{
+public:
+
+    Impl(LiveClock& owner, const std::shared_ptr<Timezones>& tzd):
+        owner_(owner),
+        timezones_(tzd)
+    {
+        if (timezones_)
+        {
+            timezones_->timezone.changed().connect ([this](const std::string& z) {setTimezone(z);});
+            setTimezone(timezones_->timezone.get());
+        }
+
+        owner_.skewTestIntervalSec.changed().connect([this](unsigned int intervalSec) {setInterval(intervalSec);});
+        setInterval(owner_.skewTestIntervalSec.get());
+    }
+
+    ~Impl()
+    {
+        clearTimer();
+
+        g_clear_pointer (&timezone_, g_time_zone_unref);
+    }
+
+    GDateTime* localtime() const
+    {
+        g_assert (timezone_ != nullptr);
+
+        return g_date_time_new_now (timezone_);
+    }
+
+private:
+
+    void setTimezone (const std::string& str)
+    {
+        g_clear_pointer (&timezone_, g_time_zone_unref);
+        timezone_= g_time_zone_new (str.c_str());
+        owner_.skewDetected();
+    }
+
+private:
+
+    void clearTimer()
+    {
+        if (skew_timeout_id_)
+        {
+            g_source_remove(skew_timeout_id_);
+            skew_timeout_id_ = 0;
+        }
+
+        g_clear_pointer(&prev_datetime_, g_date_time_unref);
+    }
+
+    void setInterval(unsigned int seconds)
+    {
+        clearTimer();
+
+        if (seconds > 0)
+        {
+            prev_datetime_ = owner_.localtime();
+            skew_timeout_id_ = g_timeout_add_seconds(seconds, onTimerPulse, this);
+        }
+    }
+
+    static gboolean onTimerPulse(gpointer gself)
+    {
+        auto self = static_cast<Impl*>(gself);
+
+        // check to see if too much time passed since the last check */
+        GDateTime * now = self->owner_.localtime();
+        const GTimeSpan diff = g_date_time_difference(now, self->prev_datetime_);
+        const GTimeSpan fuzz = 5;
+        const GTimeSpan max = (self->owner_.skewTestIntervalSec.get() + fuzz) * G_USEC_PER_SEC;
+        if (abs(diff) > max)
+            self->owner_.skewDetected();
+
+        // update prev_datetime
+        g_clear_pointer(&self->prev_datetime_, g_date_time_unref);
+        self->prev_datetime_ = now;
+
+        return G_SOURCE_CONTINUE;
+    }
+
+protected:
+
+    LiveClock& owner_;
+    GTimeZone * timezone_ = nullptr;
+    std::shared_ptr<Timezones> timezones_;
+
+    GDateTime * prev_datetime_ = nullptr;
+    unsigned int skew_timeout_id_ = 0;
+    unsigned int sleep_subscription_id_ = 0;
+};
+
+LiveClock::LiveClock(const std::shared_ptr<Timezones>& tzd):
+  p (new Impl (*this, tzd))
+{
+}
+
+LiveClock::~LiveClock() =default;
+
+GDateTime *
+LiveClock::localtime() const
+{
+    return p->localtime();
+}
+
+} // namespace datetime
+} // namespace indicator
+} // namespace unity
+