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LoadBalancerSingle.php
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LoadBalancerSingle.php
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<?php
/**
* 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
*/
namespace Wikimedia\Rdbms;
use InvalidArgumentException;
/**
* Trivial LoadBalancer that always returns an injected connection handle.
*
* @ingroup Database
*/
class LoadBalancerSingle extends LoadBalancer {
/** @var Database */
private $conn;
/**
* You probably want to use {@link newFromConnection} instead.
*
* @param array $params An associative array with one member:
* - connection: An IDatabase connection object
*/
public function __construct( array $params ) {
/** @var Database $conn */
$conn = $params['connection'] ?? null;
if ( !$conn ) {
throw new InvalidArgumentException( "Missing 'connection' argument." );
}
$this->conn = $conn;
parent::__construct( [
'servers' => [ [
'type' => $conn->getType(),
'host' => $conn->getServer(),
'dbname' => $conn->getDBname(),
'load' => 1,
] ],
'trxProfiler' => $params['trxProfiler'] ?? null,
'srvCache' => $params['srvCache'] ?? null,
'wanCache' => $params['wanCache'] ?? null,
'localDomain' => $params['localDomain'] ?? $this->conn->getDomainID(),
'readOnlyReason' => $params['readOnlyReason'] ?? false,
'clusterName' => $params['clusterName'] ?? null,
] );
if ( isset( $params['readOnlyReason'] ) ) {
$conn->setLBInfo( $conn::LB_READ_ONLY_REASON, $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( array_merge(
[ 'localDomain' => $db->getDomainID() ],
$params,
[ 'connection' => $db ]
) );
}
protected function sanitizeConnectionFlags( $flags, $domain ) {
// There is only one underlying connection handle. Also, this class is only meant to
// be used during situations like site installation, where there should be no contenting
// connections, and integration testing, where everything uses temporary tables.
$flags &= ~self::CONN_TRX_AUTOCOMMIT;
return $flags;
}
protected function reallyOpenConnection( $i, DatabaseDomain $domain, array $lbInfo ) {
foreach ( $lbInfo as $k => $v ) {
$this->conn->setLBInfo( $k, $v );
}
return $this->conn;
}
public function __destruct() {
// do nothing since the connection was injected
}
}

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LoadBalancerSingle.php (3 KB)

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