9f01cee8fa
* Also split out LBFactory classes to their own files Change-Id: I9e649878afcffdb736c09c0574e5f99b1e72382f
66 lines
1.8 KiB
PHP
66 lines
1.8 KiB
PHP
<?php
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/**
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* Database load monitoring.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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* http://www.gnu.org/copyleft/gpl.html
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*
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* @file
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* @ingroup Database
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*/
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/**
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* An interface for database load monitoring
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*
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* @ingroup Database
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*/
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interface LoadMonitor {
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/**
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* Construct a new LoadMonitor with a given LoadBalancer parent
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*
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* @param LoadBalancer $parent
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*/
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public function __construct( $parent );
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/**
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* Perform pre-connection load ratio adjustment.
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* @param array $loads
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* @param string|bool $group The selected query group. Default: false
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* @param string|bool $wiki Default: false
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*/
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public function scaleLoads( &$loads, $group = false, $wiki = false );
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/**
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* Return an estimate of replication lag for each server
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*
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* @param array $serverIndexes
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* @param string $wiki
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*
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* @return array Map of (server index => seconds)
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*/
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public function getLagTimes( $serverIndexes, $wiki );
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}
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class LoadMonitorNull implements LoadMonitor {
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public function __construct( $parent ) {
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}
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public function scaleLoads( &$loads, $group = false, $wiki = false ) {
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}
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public function getLagTimes( $serverIndexes, $wiki ) {
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return array_fill_keys( $serverIndexes, 0 );
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}
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}
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