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<?php
/**
* Bitrix Framework
* @package bitrix
* @subpackage main
* @copyright 2001-2012 Bitrix
*/
namespace Bitrix\Main\Data;
/**
* Connection pool is a connections holder
*/
class ConnectionPool
{
/**
* @var Connection[]
*/
private $connections = array();
const DEFAULT_CONNECTION_NAME = "default";
/**
* Creates connection pool object
*/
public function __construct()
{
}
private function createConnection($name, $parameters)
{
$className = $parameters['className'];
if (!class_exists($className))
{
throw new \Bitrix\Main\Config\ConfigurationException(sprintf(
"Class '%s' for '%s' connection was not found", $className, $name
));
}
return new $className($parameters);
}
/**
* Returns database connection by int name. Creates new connection if necessary.
*
* @param string $name Connection name
* @return Connection
* @throws \Bitrix\Main\Config\ConfigurationException If connection with specified name does not exist
*/
public function getConnection($name = "")
{
if ($name === "")
{
$name = self::DEFAULT_CONNECTION_NAME;
}
if (!isset($this->connections[$name]))
{
$connParameters = $this->searchConnectionParametersByName($name);
if (!empty($connParameters) && is_array($connParameters))
{
$connection = $this->createConnection($name, $connParameters);
$this->connections[$name] = $connection;
}
else
{
throw new \Bitrix\Main\Config\ConfigurationException(sprintf(
"Database connection '%s' is not found", $name
));
}
}
return $this->connections[$name];
}
/**
* Search connection parameters (type, host, db, login and password) by connection name
*
* @param string $name Connection name
* @return array|null
* @throws \Bitrix\Main\ArgumentTypeException
* @throws \Bitrix\Main\ArgumentNullException
*/
private function searchConnectionParametersByName($name)
{
if (!is_string($name))
{
throw new \Bitrix\Main\ArgumentTypeException("name", "string");
}
if ($name === "")
{
throw new \Bitrix\Main\ArgumentNullException("name");
}
$connectionsConfiguration = \Bitrix\Main\Config\Configuration::getValue('connections');
if (isset($connectionsConfiguration[$name]))
{
return $connectionsConfiguration[$name];
}
/* TODO: exception, if config not found */
return null;
}
}