includes/db/loadbalancer/LBFactorySingle.php

   1 <?php
   2 /**
   3  * Simple generator of database connections that always returns the same object.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup Database
  22  */
  23
  24 /**
  25  * An LBFactory class that always returns a single database object.
  26  */
  27 class LBFactorySingle extends LBFactory {
  28         /** @var LoadBalancerSingle */
  29         private $lb;
  30
  31         /**
  32          * @param array $conf An associative array with one member:
  33          *  - connection: The IDatabase connection object
  34          */
  35         public function __construct( array $conf ) {
  36                 parent::__construct( $conf );
  37
  38                 if ( !isset( $conf['connection'] ) ) {
  39                         throw new InvalidArgumentException( "Missing 'connection' argument." );
  40                 }
  41
  42                 $this->lb = new LoadBalancerSingle( array_merge( $this->baseLoadBalancerParams(), $conf ) );
  43         }
  44
  45         /**
  46          * @param bool|string $wiki
  47          * @return LoadBalancerSingle
  48          */
  49         public function newMainLB( $wiki = false ) {
  50                 return $this->lb;
  51         }
  52
  53         /**
  54          * @param bool|string $wiki
  55          * @return LoadBalancerSingle
  56          */
  57         public function getMainLB( $wiki = false ) {
  58                 return $this->lb;
  59         }
  60
  61         /**
  62          * @param string $cluster External storage cluster, or false for core
  63          * @param bool|string $wiki Wiki ID, or false for the current wiki
  64          * @return LoadBalancerSingle
  65          */
  66         protected function newExternalLB( $cluster, $wiki = false ) {
  67                 return $this->lb;
  68         }
  69
  70         /**
  71          * @param string $cluster External storage cluster, or false for core
  72          * @param bool|string $wiki Wiki ID, or false for the current wiki
  73          * @return LoadBalancerSingle
  74          */
  75         public function getExternalLB( $cluster, $wiki = false ) {
  76                 return $this->lb;
  77         }
  78
  79         /**
  80          * @param string|callable $callback
  81          * @param array $params
  82          */
  83         public function forEachLB( $callback, array $params = [] ) {
  84                 call_user_func_array( $callback, array_merge( [ $this->lb ], $params ) );
  85         }
  86 }