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<?php
/**
* Lock manager registration handling.
*
* 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 LockManager
*/
/**
* Class to handle file lock manager registration
*
* @ingroup LockManager
* @author Aaron Schulz
* @since 1.19
*/
class LockManagerGroup {
/**
* @var LockManagerGroup
*/
protected static $instance = null;
/** @var Array of (name => ('class' =>, 'config' =>, 'instance' =>)) */
protected $managers = array();
protected function __construct() {}
/**
* @return LockManagerGroup
*/
public static function singleton() {
if ( self::$instance == null ) {
self::$instance = new self();
self::$instance->initFromGlobals();
}
return self::$instance;
}
/**
* Destroy the singleton instance, so that a new one will be created next
* time singleton() is called.
*/
public static function destroySingleton() {
self::$instance = null;
}
/**
* Register lock managers from the global variables
*
* @return void
*/
protected function initFromGlobals() {
global $wgLockManagers;
$this->register( $wgLockManagers );
}
/**
* Register an array of file lock manager configurations
*
* @param $configs Array
* @return void
* @throws MWException
*/
protected function register( array $configs ) {
foreach ( $configs as $config ) {
if ( !isset( $config['name'] ) ) {
throw new MWException( "Cannot register a lock manager with no name." );
}
$name = $config['name'];
if ( !isset( $config['class'] ) ) {
throw new MWException( "Cannot register lock manager `{$name}` with no class." );
}
$class = $config['class'];
unset( $config['class'] ); // lock manager won't need this
$this->managers[$name] = array(
'class' => $class,
'config' => $config,
'instance' => null
);
}
}
/**
* Get the lock manager object with a given name
*
* @param $name string
* @return LockManager
* @throws MWException
*/
public function get( $name ) {
if ( !isset( $this->managers[$name] ) ) {
throw new MWException( "No lock manager defined with the name `$name`." );
}
// Lazy-load the actual lock manager instance
if ( !isset( $this->managers[$name]['instance'] ) ) {
$class = $this->managers[$name]['class'];
$config = $this->managers[$name]['config'];
$this->managers[$name]['instance'] = new $class( $config );
}
return $this->managers[$name]['instance'];
}
/**
* Get the default lock manager configured for the site.
* Returns NullLockManager if no lock manager could be found.
*
* @return LockManager
*/
public function getDefault() {
return isset( $this->managers['default'] )
? $this->get( 'default' )
: new NullLockManager( array() );
}
/**
* Get the default lock manager configured for the site
* or at least some other effective configured lock manager.
* Throws an exception if no lock manager could be found.
*
* @return LockManager
* @throws MWException
*/
public function getAny() {
return isset( $this->managers['default'] )
? $this->get( 'default' )
: $this->get( 'fsLockManager' );
}
}
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