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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; /** * Database connection manager. * * This manages access to primary and replica databases. It also manages state that indicates whether * the replica databases are possibly outdated after a write operation, and thus the primary database * should be used for subsequent read operations. * * @note: Services that access overlapping sets of database tables, or interact with logically * related sets of data in the database, should share a SessionConsistentConnectionManager. * Services accessing unrelated sets of information may prefer to not share a * SessionConsistentConnectionManager, so they can still perform read operations against replica * databases after a (unrelated, per the assumption) write operation to the primary database. * Generally, sharing a SessionConsistentConnectionManager improves consistency (by avoiding race * conditions due to replication lag), but can reduce performance (by directing more read * operations to the primary database server). * * @since 1.29 * @ingroup Database * @author Daniel Kinzler * @author Addshore */ class SessionConsistentConnectionManager extends ConnectionManager { /** * @var bool */ private $forceWriteConnection = false; /** * Forces all future calls to getReadConnection() to return a write connection. * Use this before performing read operations that are critical for a future update. * * @since 1.29 */ public function prepareForUpdates() { $this->forceWriteConnection = true; } /** * @since 1.29 * @since 1.37 Added optional $flags parameter * * @param string[]|null $groups * @param int $flags * * @return IReadableDatabase */ public function getReadConnection( ?array $groups = null, int $flags = 0 ) { if ( $this->forceWriteConnection ) { return parent::getWriteConnection( $flags ); } return parent::getReadConnection( $groups, $flags ); } /** * @since 1.29 * @since 1.37 Added optional $flags parameter * * @param int $flags * * @return IDatabase */ public function getWriteConnection( int $flags = 0 ) { $this->prepareForUpdates(); return parent::getWriteConnection( $flags ); } }
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