Statistics::getCounters

public function getCounters()
{
	if ($this->counters !== null)
	{
		return $this->counters;
	}

	$list = array();
	$filter = $this->getMappedFilter();
	$select = array(
		'SEND_ALL' => 'COUNT_SEND_ALL',
		'SEND_ERROR' => 'COUNT_SEND_ERROR',
		'SEND_SUCCESS' => 'COUNT_SEND_SUCCESS',
		'READ' => 'COUNT_READ',
		'CLICK' => 'COUNT_CLICK',
		'UNSUB' => 'COUNT_UNSUB'
	);
	$runtime = array();
	foreach ($select as $alias => $fieldName)
	{
		$runtime[] = new ExpressionField($alias, 'SUM(%s)', $fieldName);
	}
	$listDb = PostingTable::getList(array(
		'select' => array_keys($select),
		'filter' => $filter,
		'runtime' => $runtime,
		'cache' => array('ttl' => $this->getCacheTtl(), 'cache_joins' => true)
	));
	while ($item = $listDb->fetch())
	{
		$list = array_merge($list, $this->createListFromItem($item));
	}

	$this->counters = $list;
	return $list;
}