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+/* Icinga 2 | (c) 2012 Icinga GmbH | GPLv2+ */
+
+#ifndef TIMER_H
+#define TIMER_H
+
+#include "base/i2-base.hpp"
+#include "base/object.hpp"
+#include <boost/signals2.hpp>
+
+namespace icinga {
+
+class TimerHolder;
+
+/**
+ * A timer that periodically triggers an event.
+ *
+ * @ingroup base
+ */
+class Timer final : public Object
+{
+public:
+ DECLARE_PTR_TYPEDEFS(Timer);
+
+ ~Timer() override;
+
+ static void Initialize();
+ static void Uninitialize();
+ static void InitializeThread();
+ static void UninitializeThread();
+
+ void SetInterval(double interval);
+ double GetInterval() const;
+
+ static void AdjustTimers(double adjustment);
+
+ void Start();
+ void Stop(bool wait = false);
+
+ void Reschedule(double next = -1);
+ double GetNext() const;
+
+ boost::signals2::signal<void(const Timer * const&)> OnTimerExpired;
+
+private:
+ double m_Interval{0}; /**< The interval of the timer. */
+ double m_Next{0}; /**< When the next event should happen. */
+ bool m_Started{false}; /**< Whether the timer is enabled. */
+ bool m_Running{false}; /**< Whether the timer proc is currently running. */
+
+ void Call();
+ void InternalReschedule(bool completed, double next = -1);
+
+ static void TimerThreadProc();
+
+ friend class TimerHolder;
+};
+
+}
+
+#endif /* TIMER_H */