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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 BadMethodCallException;
use InvalidArgumentException;
/**
* LoadBalancer manager for sites with one "main" cluster using only injected database connections
*
* This class assumes that there are no "external" clusters.
*
* LoadBalancerDisabled will be used if a null connection handle is injected.
*
* @see ILBFactory
* @ingroup Database
*/
class LBFactorySingle extends LBFactory {
/** @var LoadBalancerSingle|LoadBalancerDisabled */
private $mainLB;
/**
* @note Use of {@link newFromConnection} is preferable
*
* @param array $conf An associative array containing one of the following:
* - connection: The IDatabase connection handle to use; null to disable access
*/
public function __construct( array $conf ) {
parent::__construct( $conf );
if ( !array_key_exists( 'connection', $conf ) ) {
throw new InvalidArgumentException( "Missing 'connection' argument." );
}
$conn = $conf['connection'];
if ( $conn ) {
$mainLB = new LoadBalancerSingle( array_merge(
$this->baseLoadBalancerParams(),
[ 'connection' => $conn ]
) );
} else {
$mainLB = new LoadBalancerDisabled( $this->baseLoadBalancerParams() );
}
$this->initLoadBalancer( $mainLB );
$this->mainLB = $mainLB;
}
/**
* @param IDatabase $db Live connection handle
* @param array $params Parameter map to LBFactorySingle::__construct()
* @return LBFactorySingle
* @since 1.28
*/
public static function newFromConnection( IDatabase $db, array $params = [] ) {
return new static( array_merge(
[ 'localDomain' => $db->getDomainID() ],
$params,
[ 'connection' => $db ]
) );
}
/**
* @param array $params Parameter map to LBFactorySingle::__construct()
* @return LBFactorySingle
* @since 1.40
*/
public static function newDisabled( array $params = [] ) {
return new static( array_merge(
$params,
[ 'connection' => null ]
) );
}
public function newMainLB( $domain = false ): ILoadBalancerForOwner {
// @phan-suppress-previous-line PhanPluginNeverReturnMethod
throw new BadMethodCallException( "Method is not supported." );
}
public function getMainLB( $domain = false ): ILoadBalancer {
return $this->mainLB;
}
public function newExternalLB( $cluster ): ILoadBalancerForOwner {
// @phan-suppress-previous-line PhanPluginNeverReturnMethod
throw new BadMethodCallException( "Method is not supported." );
}
public function getExternalLB( $cluster ): ILoadBalancer {
// @phan-suppress-previous-line PhanPluginNeverReturnMethod
throw new BadMethodCallException( "Method is not supported." );
}
public function getAllMainLBs(): array {
return [ self::CLUSTER_MAIN_DEFAULT => $this->mainLB ];
}
public function getAllExternalLBs(): array {
return [];
}
protected function getLBsForOwner() {
if ( $this->mainLB !== null ) {
yield $this->mainLB;
}
}
public function __destruct() {
// do nothing since the connection was injected
}
}
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