Contact::clearEvent

public function clearEvent()
{
	if (!$this->canClearEvent())
	{
		return -1;
	}

	$eventVolume = new Volume\Event();
	$eventVolume->setFilter($this->getFilter());

	$query = $eventVolume->prepareRelationQuery(static::className());

	$dropped = -1;

	if ($eventVolume->prepareFilter($query))
	{
		$query
			->addSelect('EVENT_ID')
			->where('ENTITY_TYPE', '=', \CCrmOwnerType::ContactName)
			->setLimit(self::MAX_ENTITY_PER_INTERACTION)
			->setOrder(array('EVENT_ID' => 'ASC'));

		if ($this->getProcessOffset() > 0)
		{
			$query->where('EVENT_ID', '>', $this->getProcessOffset());
		}

		$res = $query->exec();

		$dropped = 0;
		while ($event = $res->fetch())
		{
			$this->setProcessOffset($event['EVENT_ID']);

			if (Volume\Event::dropEvent($event['EVENT_ID'], $this->getOwner()))
			{
				$this->incrementDroppedEventCount();
				$dropped ++;
			}
			else
			{
				$this->collectError(new Main\Error('Deletion failed with event #'.$event['EVENT_ID'], self::ERROR_DELETION_FAILED));
				$this->incrementFailCount();
			}

			if ($this->hasTimeLimitReached())
			{
				break;
			}
		}
	}
	else
	{
		$this->collectError(new Main\Error('Filter error', self::ERROR_DELETION_FAILED));
	}

	return $dropped;
}