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<?php
/**
* 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
*/
namespace Wikimedia\Rdbms;
use Psr\Log\LoggerAwareInterface;
use Wikimedia\ObjectCache\BagOStuff;
use Wikimedia\ObjectCache\WANObjectCache;
use Wikimedia\Stats\StatsdAwareInterface;
/**
* Database load monitoring interface
*
* @internal This class should not be called outside of LoadBalancer
* @ingroup Database
*/
interface ILoadMonitor extends LoggerAwareInterface, StatsdAwareInterface {
public const STATE_UP = 'up';
public const STATE_CONN_COUNT = 'conn_count';
public const STATE_AS_OF = 'time';
/**
* Construct a new LoadMonitor with a given LoadBalancer parent
*
* @param ILoadBalancer $lb LoadBalancer this instance serves
* @param BagOStuff $sCache Local server memory cache
* @param WANObjectCache $wCache Local cluster memory cache
* @param array $options Additional parameters include:
* - maxConnCount: maximum number of connections before circuit breaking to kick in [default: infinity]
*/
public function __construct( ILoadBalancer $lb, BagOStuff $sCache, WANObjectCache $wCache, $options );
/**
* Perform load ratio adjustment before deciding which server to use
*
* @param array<int,int|float> &$weightByServer Map of (server index => weight)
*/
public function scaleLoads( array &$weightByServer );
}
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