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<?php
namespace SMW\MediaWiki;
use SMW\DBConnectionProvider;
use DatabaseBase;
use RuntimeException;
/**
* @ingroup SMW
*
* @licence GNU GPL v2+
* @since 1.9
*
* @author Jeroen De Dauw < jeroendedauw@gmail.com >
*/
class LazyDBConnectionProvider implements DBConnectionProvider {
/** @var DatabaseBase|null */
protected $connection = null;
/** @var int|null */
protected $connectionId = null;
/** @var string|array */
protected $groups;
/** @var string|boolean $wiki */
protected $wiki;
/**
* @since 1.9
*
* @param int $connectionId
* @param string|array $groups
* @param string|boolean $wiki
*/
public function __construct( $connectionId, $groups = array(), $wiki = false ) {
$this->connectionId = $connectionId;
$this->groups = $groups;
$this->wiki = $wiki;
}
/**
* @see DBConnectionProvider::getConnection
*
* @since 1.9
*
* @return DatabaseBase
* @throws RuntimeException
*/
public function getConnection() {
if ( $this->connection === null ) {
$this->connection = wfGetLB( $this->wiki )->getConnection( $this->connectionId, $this->groups, $this->wiki );
}
if ( $this->isConnection( $this->connection ) ) {
return $this->connection;
}
throw new RuntimeException( 'Expected a DatabaseBase instance' );
}
/**
* @see DBConnectionProvider::releaseConnection
*
* @since 1.9
*/
public function releaseConnection() {
if ( $this->wiki !== false && $this->connection !== null ) {
wfGetLB( $this->wiki )->reuseConnection( $this->connection );
}
}
protected function isConnection( $connection ) {
return $connection instanceof DatabaseBase;
}
}
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