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 *    used to endorse or promote products derived from this software
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#include "SubscriptionInterval.hpp"

namespace uORB
{

bool SubscriptionInterval::updated()
{
	if (advertised() && (hrt_elapsed_time(&_last_update) >= _interval_us)) {
		return _subscription.updated();
	}

	return false;
}

bool SubscriptionInterval::update(void *dst)
{
	if (updated()) {
		return copy(dst);
	}

	return false;
}

bool SubscriptionInterval::copy(void *dst)
{
	if (_subscription.copy(dst)) {
		const hrt_abstime now = hrt_absolute_time();

		// make sure we don't set a timestamp before the timer started counting (now - _interval_us would wrap because it's unsigned)
		if (now > _interval_us) {
			// shift last update time forward, but don't let it get further behind than the interval
			_last_update = math::constrain(_last_update + _interval_us, now - _interval_us, now);

		} else {
			_last_update = now;
		}

		return true;
	}

	return false;
}

} // namespace uORB