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<?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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