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<?php
/**
* 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 $managers = array();
protected function __construct() {}
protected function __clone() {}
/**
* @return LockManagerGroup
*/
public static function singleton() {
if ( self::$instance == null ) {
self::$instance = new self();
self::$instance->initFromGlobals();
}
return self::$instance;
}
/**
* 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'];
}
}
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