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<?php |
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/** |
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* Simple generator of database connections that always returns the same object. |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License along |
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* with this program; if not, write to the Free Software Foundation, Inc., |
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
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* http://www.gnu.org/copyleft/gpl.html |
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* |
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* @file |
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* @ingroup Database |
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*/ |
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/** |
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* Trivial LoadBalancer that always returns an injected connection handle |
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*/ |
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class LoadBalancerSingle extends LoadBalancer { |
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/** @var IDatabase */ |
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private $db; |
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/** |
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* @param array $params An associative array with one member: |
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* - connection: An IDatabase connection object |
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*/ |
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public function __construct( array $params ) { |
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if ( !isset( $params['connection'] ) ) { |
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throw new InvalidArgumentException( "Missing 'connection' argument." ); |
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} |
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$this->db = $params['connection']; |
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parent::__construct( [ |
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'servers' => [ |
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[ |
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'type' => $this->db->getType(), |
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'host' => $this->db->getServer(), |
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'dbname' => $this->db->getDBname(), |
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'load' => 1, |
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] |
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], |
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'trxProfiler' => isset( $params['trxProfiler'] ) ? $params['trxProfiler'] : null, |
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'srvCache' => isset( $params['srvCache'] ) ? $params['srvCache'] : null, |
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'wanCache' => isset( $params['wanCache'] ) ? $params['wanCache'] : null |
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] ); |
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if ( isset( $params['readOnlyReason'] ) ) { |
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$this->db->setLBInfo( 'readOnlyReason', $params['readOnlyReason'] ); |
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} |
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} |
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/** |
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* @param IDatabase $db Live connection handle |
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* @param array $params Parameter map to LoadBalancerSingle::__constructs() |
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* @return LoadBalancerSingle |
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* @since 1.28 |
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*/ |
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public static function newFromConnection( IDatabase $db, array $params = [] ) { |
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return new static( [ 'connection' => $db ] + $params ); |
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} |
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/** |
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* |
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* @param string $server |
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* @param bool $dbNameOverride |
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* |
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* @return IDatabase |
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*/ |
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protected function reallyOpenConnection( $server, $dbNameOverride = false ) { |
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return $this->db; |
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} |
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} |
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wikimedia /
mediawiki
