system_time_keeper.h

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namespace system_time_periods {
    static const t_filetimestamp second = filetimestamp_1second_increment;
    static const t_filetimestamp minute = second * 60;
    static const t_filetimestamp hour = minute * 60;
    static const t_filetimestamp day = hour * 24;
    static const t_filetimestamp week = day * 7;
};
class system_time_callback {
public:
    virtual void on_time_changed(t_filetimestamp newVal) = 0;
};
class system_time_keeper : public service_base {
public:
    virtual void register_callback(system_time_callback * callback, t_filetimestamp resolution) = 0;

    virtual void unregister_callback(system_time_callback * callback) = 0;

    FB2K_MAKE_SERVICE_INTERFACE_ENTRYPOINT(system_time_keeper)
};

class system_time_callback_impl : public system_time_callback {
public:
    system_time_callback_impl() : m_registered() {}
    ~system_time_callback_impl() {stop_timer();}

    void stop_timer() {
        if (m_registered) {
            static_api_ptr_t<system_time_keeper>()->unregister_callback(this);
            m_registered = false;
        }
    }
    void initialize_timer(t_filetimestamp period) {
        stop_timer();
        static_api_ptr_t<system_time_keeper>()->register_callback(this, period);
        m_registered = true;
    }

    void on_time_changed(t_filetimestamp newVal) {}

    PFC_CLASS_NOT_COPYABLE_EX(system_time_callback_impl)
private:
    bool m_registered;
};