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<?php
/**
* Database load monitoring interface
*
* 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 Database
*/
namespace Wikimedia\Rdbms;
use Psr\Log\LoggerAwareInterface;
use BagOStuff;
use WANObjectCache;
/**
* An interface for database load monitoring
*
* @ingroup Database
*/
interface ILoadMonitor extends LoggerAwareInterface {
/**
* 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 Options map
*/
public function __construct(
ILoadBalancer $lb, BagOStuff $sCache, WANObjectCache $wCache, array $options = []
);
/**
* Perform load ratio adjustment before deciding which server to use
*
* @param int[] &$weightByServer Map of (server index => float weight)
* @param string|bool $domain
*/
public function scaleLoads( array &$weightByServer, $domain );
/**
* Get an estimate of replication lag (in seconds) for each server
*
* Values may be "false" if replication is too broken to estimate
*
* @param int[] $serverIndexes
* @param string $domain
* @return array Map of (server index => float|int|bool)
*/
public function getLagTimes( array $serverIndexes, $domain );
}
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