CommunicationStatistics::updateActivity

static function updateActivity(array $activity, array $prevFields)
{
	$bindings = static::getCommunicationBindings($activity);
	$prevBindings = static::getCommunicationBindings($prevFields);

	$curNeedle = static::isRegistrationNeedle($activity);
	$prevNeedle = static::isRegistrationNeedle($prevFields);

	if (!$curNeedle && !$prevNeedle && !$bindings && !$prevBindings)
		return true;

	if ($prevNeedle)
	{
		if ($curNeedle)
			$prevBindings = static::getLostBindings($prevBindings, $bindings);
		if ($prevBindings)
		{
			static::updateStatistics($prevFields, $prevBindings);
		}
	}

	if ($curNeedle && $bindings)
		static::updateStatistics($activity, $bindings);
}