includes/db/LBFactory_Single.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 LBFactory_Single extends LBFactory {
  28         protected $lb;
  29
  30         /**
  31          * @param $conf array An associative array with one member:
  32          *  - connection: The DatabaseBase connection object
  33          */
  34         function __construct( $conf ) {
  35                 $this->lb = new LoadBalancer_Single( $conf );
  36         }
  37
  38         /**
  39          * @param $wiki bool|string
  40          *
  41          * @return LoadBalancer_Single
  42          */
  43         function newMainLB( $wiki = false ) {
  44                 return $this->lb;
  45         }
  46
  47         /**
  48          * @param $wiki bool|string
  49          *
  50          * @return LoadBalancer_Single
  51          */
  52         function getMainLB( $wiki = false ) {
  53                 return $this->lb;
  54         }
  55
  56         /**
  57          * @param $cluster
  58          * @param $wiki bool|string
  59          *
  60          * @return LoadBalancer_Single
  61          */
  62         function newExternalLB( $cluster, $wiki = false ) {
  63                 return $this->lb;
  64         }
  65
  66         /**
  67          * @param $cluster
  68          * @param $wiki bool|string
  69          *
  70          * @return LoadBalancer_Single
  71          */
  72         function &getExternalLB( $cluster, $wiki = false ) {
  73                 return $this->lb;
  74         }
  75
  76         /**
  77          * @param $callback string|array
  78          * @param $params array
  79          */
  80         function forEachLB( $callback, $params = array() ) {
  81                 call_user_func_array( $callback, array_merge( array( $this->lb ), $params ) );
  82         }
  83 }
  84
  85 /**
  86  * Helper class for LBFactory_Single.
  87  */
  88 class LoadBalancer_Single extends LoadBalancer {
  89
  90         /**
  91          * @var DatabaseBase
  92          */
  93         var $db;
  94
  95         /**
  96          * @param $params array
  97          */
  98         function __construct( $params ) {
  99                 $this->db = $params['connection'];
 100                 parent::__construct( array( 'servers' => array( array(
 101                         'type' => $this->db->getType(),
 102                         'host' => $this->db->getServer(),
 103                         'dbname' => $this->db->getDBname(),
 104                         'load' => 1,
 105                 ) ) ) );
 106         }
 107
 108         /**
 109          *
 110          * @param $server string
 111          * @param $dbNameOverride bool
 112          *
 113          * @return DatabaseBase
 114          */
 115         function reallyOpenConnection( $server, $dbNameOverride = false ) {
 116                 return $this->db;
 117         }
 118 }