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<?php
namespace SMW;
use SMW\Utils\StatsFormatter;
/**
* A multipurpose non-persistent static pool cache to keep selected items for
* the duration of a request cacheable.
*
* @license GNU GPL v2+
* @since 2.3
*
* @author mwjames
*/
class InMemoryPoolCache {
/**
* Stats as plain string
*/
const FORMAT_PLAIN = StatsFormatter::FORMAT_PLAIN;
/**
* Stats as JSON output
*/
const FORMAT_JSON = StatsFormatter::FORMAT_JSON;
/**
* Stats as HTML list output
*/
const FORMAT_HTML = StatsFormatter::FORMAT_HTML;
/**
* @var InMemoryPoolCache
*/
private static $instance = null;
/**
* @var CacheFactory
*/
private $cacheFactory = null;
/**
* @var array
*/
private $poolCacheList = [];
/**
* @since 2.3
*
* @param CacheFactory $cacheFactory
*/
public function __construct( CacheFactory $cacheFactory ) {
$this->cacheFactory = $cacheFactory;
}
/**
* @since 2.3
*
* @return InMemoryPoolCache
*/
public static function getInstance() {
if ( self::$instance === null ) {
self::$instance = new self( ApplicationFactory::getInstance()->newCacheFactory() );
}
return self::$instance;
}
/**
* @since 2.3
*/
public static function clear() {
self::$instance = null;
}
/**
* @since 2.3
*
* @param string $poolCacheName
*/
public function resetPoolCacheById( $poolCacheName = '' ) {
foreach ( $this->poolCacheList as $key => $value ) {
if ( $key === $poolCacheName || $poolCacheName === '' ) {
unset( $this->poolCacheList[$key] );
}
}
}
/**
* @since 2.4
*
* @param string|null $format
*
* @return string|array
*/
public function getStats( $format = null ) {
return StatsFormatter::format( $this->computeStats(), $format );
}
/**
* @deprecated since 2.5, use InMemoryPoolCache::getPoolCacheById
* @since 2.3
*
* @param string $poolCacheName
* @param integer $cacheSize
*
* @return Cache
*/
public function getPoolCacheFor( $poolCacheName, $cacheSize = 500 ) {
return $this->getPoolCacheById( $poolCacheName, $cacheSize );
}
/**
* @since 2.5
*
* @param string $poolCacheId
* @param integer $cacheSize
*
* @return Cache
*/
public function getPoolCacheById( $poolCacheId, $cacheSize = 500 ) {
if ( !isset( $this->poolCacheList[$poolCacheId] ) ) {
$this->poolCacheList[$poolCacheId] = $this->cacheFactory->newFixedInMemoryCache( $cacheSize );
}
return $this->poolCacheList[$poolCacheId];
}
private function computeStats() {
ksort( $this->poolCacheList );
$stats = [];
foreach ( $this->poolCacheList as $key => $value ) {
$stats[$key] = [];
$hits = 0;
$misses = 0;
foreach ( $value->getStats() as $k => $v ) {
$stats[$key][$k] = $v;
if ( $k === 'hits' ) {
$hits = $v;
}
if ( $k === 'inserts' ) {
$misses = $v;
}
if ( $k === 'misses' && $v > 0 ) {
$misses = $v;
}
}
$hitRatio = $hits > 0 ? round( $hits / ( $hits + $misses ), 4 ) : 0;
$stats[$key]['hit ratio'] = $hitRatio;
$stats[$key]['miss ratio'] = $hitRatio > 0 ? round( 1 - $hitRatio, 4 ) : 0;
}
return $stats;
}
}
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