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<?php
/**
* Simple generator of database connections that always returns the same object.
*
* 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
*
* @file
* @ingroup Database
*/
namespace Wikimedia\Rdbms;
use InvalidArgumentException;
/**
* Trivial LoadBalancer that always returns an injected connection handle
*/
class LoadBalancerSingle extends LoadBalancer {
/** @var IDatabase */
private $db;
/**
* @param array $params An associative array with one member:
* - connection: An IDatabase connection object
*/
public function __construct( array $params ) {
if ( !isset( $params['connection'] ) ) {
throw new InvalidArgumentException( "Missing 'connection' argument." );
}
$this->db = $params['connection'];
parent::__construct( [
'servers' => [
[
'type' => $this->db->getType(),
'host' => $this->db->getServer(),
'dbname' => $this->db->getDBname(),
'load' => 1,
]
],
'trxProfiler' => isset( $params['trxProfiler'] ) ? $params['trxProfiler'] : null,
'srvCache' => isset( $params['srvCache'] ) ? $params['srvCache'] : null,
'wanCache' => isset( $params['wanCache'] ) ? $params['wanCache'] : null
] );
if ( isset( $params['readOnlyReason'] ) ) {
$this->db->setLBInfo( 'readOnlyReason', $params['readOnlyReason'] );
}
}
/**
* @param IDatabase $db Live connection handle
* @param array $params Parameter map to LoadBalancerSingle::__constructs()
* @return LoadBalancerSingle
* @since 1.28
*/
public static function newFromConnection( IDatabase $db, array $params = [] ) {
return new static( [ 'connection' => $db ] + $params );
}
protected function reallyOpenConnection( array $server, DatabaseDomain $domainOverride ) {
return $this->db;
}
}
class_alias( LoadBalancerSingle::class, 'LoadBalancerSingle' );
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