From d9022f63880ce039446fba8364f68e656b7bf4cb Mon Sep 17 00:00:00 2001
From: Pierre Schmitz <pierre@archlinux.de>
Date: Thu, 3 May 2012 13:01:35 +0200
Subject: Update to MediaWiki 1.19.0

---
 includes/cache/ResourceFileCache.php | 87 ++++++++++++++++++++++++++++++++++++
 1 file changed, 87 insertions(+)
 create mode 100644 includes/cache/ResourceFileCache.php

(limited to 'includes/cache/ResourceFileCache.php')

diff --git a/includes/cache/ResourceFileCache.php b/includes/cache/ResourceFileCache.php
new file mode 100644
index 00000000..e73fc2d7
--- /dev/null
+++ b/includes/cache/ResourceFileCache.php
@@ -0,0 +1,87 @@
+<?php
+/**
+ * Contain the ResourceFileCache class
+ * @file
+ * @ingroup Cache
+ */
+class ResourceFileCache extends FileCacheBase {
+	protected $mCacheWorthy;
+
+	/* @TODO: configurable? */
+	const MISS_THRESHOLD = 360; // 6/min * 60 min
+
+	/**
+	 * Construct an ResourceFileCache from a context
+	 * @param $context ResourceLoaderContext
+	 * @return ResourceFileCache
+	 */
+	public static function newFromContext( ResourceLoaderContext $context ) {
+		$cache = new self();
+
+		if ( $context->getOnly() === 'styles' ) {
+			$cache->mType = 'css';
+		} else {
+			$cache->mType = 'js';
+		}
+		$modules = array_unique( $context->getModules() ); // remove duplicates
+		sort( $modules ); // normalize the order (permutation => combination)
+		$cache->mKey = sha1( $context->getHash() . implode( '|', $modules ) );
+		if ( count( $modules ) == 1 ) {
+			$cache->mCacheWorthy = true; // won't take up much space
+		}
+
+		return $cache;
+	}
+
+	/**
+	 * Check if an RL request can be cached.
+	 * Caller is responsible for checking if any modules are private.
+	 * @param $context ResourceLoaderContext
+	 * @return bool
+	 */
+	public static function useFileCache( ResourceLoaderContext $context ) {
+		global $wgUseFileCache, $wgDefaultSkin, $wgLanguageCode;
+		if ( !$wgUseFileCache ) {
+			return false;
+		}
+		// Get all query values
+		$queryVals = $context->getRequest()->getValues();
+		foreach ( $queryVals as $query => $val ) {
+			if ( $query === 'modules' || $query === 'version' || $query === '*' ) {
+				continue; // note: &* added as IE fix
+			} elseif ( $query === 'skin' && $val === $wgDefaultSkin ) {
+				continue;
+			} elseif ( $query === 'lang' && $val === $wgLanguageCode ) {
+				continue;
+			} elseif ( $query === 'only' && in_array( $val, array( 'styles', 'scripts' ) ) ) {
+				continue;
+			} elseif ( $query === 'debug' && $val === 'false' ) {
+				continue;
+			}
+			return false;
+		}
+		return true; // cacheable
+	}
+
+	/**
+	 * Get the base file cache directory
+	 * @return string
+	 */
+	protected function cacheDirectory() {
+		return $this->baseCacheDirectory() . '/resources';
+	}
+
+	/**
+	 * Item has many recent cache misses
+	 * @return bool
+	 */
+	public function isCacheWorthy() {
+		if ( $this->mCacheWorthy === null ) {
+			$this->mCacheWorthy = (
+				$this->isCached() || // even stale cache indicates it was cache worthy
+				$this->getMissesRecent() >= self::MISS_THRESHOLD // many misses
+			);
+		}
+		return $this->mCacheWorthy;
+	}
+}
-- 
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