ResourceFileCache.php

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<?php
class ResourceFileCache extends FileCacheBase {
    protected $mCacheWorthy;

    /* @todo configurable? */
    const MISS_THRESHOLD = 360; // 6/min * 60 min

    public static function newFromContext( ResourceLoaderContext $context ) {
        $cache = new self();

        if ( $context->getImage() ) {
            $cache->mType = 'image';
        } elseif ( $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;
    }

    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 ( in_array( $query, [ 'modules', 'image', 'variant', 'version', '*' ] ) ) {
                // Use file cache regardless of the value of this parameter
                continue; // note: &* added as IE fix
            } elseif ( $query === 'skin' && $val === $wgDefaultSkin ) {
                continue;
            } elseif ( $query === 'lang' && $val === $wgLanguageCode ) {
                continue;
            } elseif ( $query === 'only' && in_array( $val, [ 'styles', 'scripts' ] ) ) {
                continue;
            } elseif ( $query === 'debug' && $val === 'false' ) {
                continue;
            } elseif ( $query === 'format' && $val === 'rasterized' ) {
                continue;
            }

            return false;
        }

        return true; // cacheable
    }

    protected function cacheDirectory() {
        return $this->baseCacheDirectory() . '/resources';
    }

    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;
    }
}