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<?php
/**
* Simple generator of database connections that always returns the same object.
*
* 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
* @ingroup Database
*/
namespace Wikimedia\Rdbms;
use InvalidArgumentException;
use BadMethodCallException;
/**
* An LBFactory class that always returns a single database object.
*/
class LBFactorySingle extends LBFactory {
/** @var LoadBalancerSingle */
private $lb;
/**
* @param array $conf An associative array with one member:
* - connection: The IDatabase connection object
*/
public function __construct( array $conf ) {
parent::__construct( $conf );
if ( !isset( $conf['connection'] ) ) {
throw new InvalidArgumentException( "Missing 'connection' argument." );
}
$lb = new LoadBalancerSingle( array_merge( $this->baseLoadBalancerParams(), $conf ) );
$this->initLoadBalancer( $lb );
$this->lb = $lb;
}
/**
* @param IDatabase $db Live connection handle
* @param array $params Parameter map to LBFactorySingle::__constructs()
* @return LBFactorySingle
* @since 1.28
*/
public static function newFromConnection( IDatabase $db, array $params = [] ) {
return new static( [ 'connection' => $db ] + $params );
}
/**
* @param bool|string $domain (unused)
* @return LoadBalancerSingle
*/
public function newMainLB( $domain = false ) {
return $this->lb;
}
/**
* @param bool|string $domain (unused)
* @return LoadBalancerSingle
*/
public function getMainLB( $domain = false ) {
return $this->lb;
}
public function newExternalLB( $cluster ) {
throw new BadMethodCallException( "Method is not supported." );
}
public function getExternalLB( $cluster ) {
throw new BadMethodCallException( "Method is not supported." );
}
/**
* @return LoadBalancerSingle[] Map of (cluster name => LoadBalancer)
*/
public function getAllMainLBs() {
return [ 'DEFAULT' => $this->lb ];
}
/**
* @return LoadBalancerSingle[] Map of (cluster name => LoadBalancer)
*/
public function getAllExternalLBs() {
return [];
}
/**
* @param string|callable $callback
* @param array $params
*/
public function forEachLB( $callback, array $params = [] ) {
if ( isset( $this->lb ) ) { // may not be set during _destruct()
call_user_func_array( $callback, array_merge( [ $this->lb ], $params ) );
}
}
}
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