includes/libs/rdbms/lbfactory/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                 $lb = new LoadBalancerSingle( array_merge( $this->baseLoadBalancerParams(), $conf ) );
  43                 $this->initLoadBalancer( $lb );
  44                 $this->lb = $lb;
  45         }
  46
  47         /**
  48          * @param IDatabase $db Live connection handle
  49          * @param array $params Parameter map to LBFactorySingle::__constructs()
  50          * @return LBFactorySingle
  51          * @since 1.28
  52          */
  53         public static function newFromConnection( IDatabase $db, array $params = [] ) {
  54                 return new static( [ 'connection' => $db ] + $params );
  55         }
  56
  57         /**
  58          * @param bool|string $domain (unused)
  59          * @return LoadBalancerSingle
  60          */
  61         public function newMainLB( $domain = false ) {
  62                 return $this->lb;
  63         }
  64
  65         /**
  66          * @param bool|string $domain (unused)
  67          * @return LoadBalancerSingle
  68          */
  69         public function getMainLB( $domain = false ) {
  70                 return $this->lb;
  71         }
  72
  73         public function newExternalLB( $cluster ) {
  74                 throw new BadMethodCallException( "Method is not supported." );
  75         }
  76
  77         public function getExternalLB( $cluster ) {
  78                 throw new BadMethodCallException( "Method is not supported." );
  79         }
  80
  81         /**
  82          * @return LoadBalancerSingle[] Map of (cluster name => LoadBalancer)
  83          */
  84         public function getAllMainLBs() {
  85                 return [ 'DEFAULT' => $this->lb ];
  86         }
  87
  88         /**
  89          * @return LoadBalancerSingle[] Map of (cluster name => LoadBalancer)
  90          */
  91         public function getAllExternalLBs() {
  92                 return [];
  93         }
  94
  95         /**
  96          * @param string|callable $callback
  97          * @param array $params
  98          */
  99         public function forEachLB( $callback, array $params = [] ) {
 100                 call_user_func_array( $callback, array_merge( [ $this->lb ], $params ) );
 101         }
 102 }