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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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