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<?php
/**
* Base class for objects that allow access to other wiki's databases using
* the foreign database access mechanism implemented by LBFactory_multi.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @since 1.21
*
* @file
* @ingroup Database
*
* @licence GNU GPL v2+
* @author Daniel Kinzler
*/
abstract class DBAccessBase implements IDBAccessObject {
/**
* @var String|bool $wiki The target wiki's name. This must be an ID
* that LBFactory can understand.
*/
protected $wiki = false;
/**
* @param string|bool $wiki The target wiki's name. This must be an ID
* that LBFactory can understand.
*/
public function __construct( $wiki = false ) {
$this->wiki = $wiki;
}
/**
* Returns a database connection.
*
* @see wfGetDB()
* @see LoadBalancer::getConnection()
*
* @since 1.21
*
* @param int $id Which connection to use
* @param array $groups Query groups
*
* @return DatabaseBase
*/
protected function getConnection( $id, $groups = array() ) {
$loadBalancer = wfGetLB( $this->wiki );
return $loadBalancer->getConnection( $id, $groups, $this->wiki );
}
/**
* Releases a database connection and makes it available for recycling.
*
* @see LoadBalancer::reuseConnection()
*
* @since 1.21
*
* @param DatabaseBase $db the database connection to release.
*/
protected function releaseConnection( DatabaseBase $db ) {
if ( $this->wiki !== false ) {
$loadBalancer = $this->getLoadBalancer();
$loadBalancer->reuseConnection( $db );
}
}
/**
* Get the database type used for read operations.
*
* @see wfGetLB
*
* @since 1.21
*
* @return LoadBalancer The database load balancer object
*/
public function getLoadBalancer() {
return wfGetLB( $this->wiki );
}
}
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