1 files changed, 168 insertions, 0 deletions
diff --git a/www/wiki/extensions/SemanticMediaWiki/src/InMemoryPoolCache.php b/www/wiki/extensions/SemanticMediaWiki/src/InMemoryPoolCache.php
new file mode 100644
index 00000000..a53b7b98
--- /dev/null
+++ b/www/wiki/extensions/SemanticMediaWiki/src/InMemoryPoolCache.php
@@ -0,0 +1,168 @@
+<?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;
+	}
+
+}