@copyright Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com) * @license http://framework.zend.com/license/new-bsd New BSD License * @version $Id: Cache.php 23154 2010-10-18 17:41:06Z mabe $ */ /** * @package Zend_Cache * @copyright Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com) * @license http://framework.zend.com/license/new-bsd New BSD License */ abstract class Zend_Cache { /** * Standard frontends * * @var array */ public static $standardFrontends = array('Core', 'Output', 'Class', 'File', 'Function', 'Page'); /** * Standard backends * * @var array */ public static $standardBackends = array('File', 'Sqlite', 'Memcached', 'Libmemcached', 'Apc', 'ZendPlatform', 'Xcache', 'TwoLevels', 'ZendServer_Disk', 'ZendServer_ShMem'); /** * Standard backends which implement the ExtendedInterface * * @var array */ public static $standardExtendedBackends = array('File', 'Apc', 'TwoLevels', 'Memcached', 'Libmemcached', 'Sqlite'); /** * Only for backward compatibility (may be removed in next major release) * * @var array * @deprecated */ public static $availableFrontends = array('Core', 'Output', 'Class', 'File', 'Function', 'Page'); /** * Only for backward compatibility (may be removed in next major release) * * @var array * @deprecated */ public static $availableBackends = array('File', 'Sqlite', 'Memcached', 'Libmemcached', 'Apc', 'ZendPlatform', 'Xcache', 'TwoLevels'); /** * Consts for clean() method */ const CLEANING_MODE_ALL = 'all'; const CLEANING_MODE_OLD = 'old'; const CLEANING_MODE_MATCHING_TAG = 'matchingTag'; const CLEANING_MODE_NOT_MATCHING_TAG = 'notMatchingTag'; const CLEANING_MODE_MATCHING_ANY_TAG = 'matchingAnyTag'; /** * Factory * * @param mixed $frontend frontend name (string) or Zend_Cache_Frontend_ object * @param mixed $backend backend name (string) or Zend_Cache_Backend_ object * @param array $frontendOptions associative array of options for the corresponding frontend constructor * @param array $backendOptions associative array of options for the corresponding backend constructor * @param boolean $customFrontendNaming if true, the frontend argument is used as a complete class name ; if false, the frontend argument is used as the end of "Zend_Cache_Frontend_[...]" class name * @param boolean $customBackendNaming if true, the backend argument is used as a complete class name ; if false, the backend argument is used as the end of "Zend_Cache_Backend_[...]" class name * @param boolean $autoload if true, there will no #require_once for backend and frontend (useful only for custom backends/frontends) * @throws Zend_Cache_Exception * @return Zend_Cache_Core|Zend_Cache_Frontend */ public static function factory($frontend, $backend, $frontendOptions = array(), $backendOptions = array(), $customFrontendNaming = false, $customBackendNaming = false, $autoload = false) { if (is_string($backend)) { $backendObject = self::_makeBackend($backend, $backendOptions, $customBackendNaming, $autoload); } else { if ((is_object($backend)) && (in_array('Zend_Cache_Backend_Interface', class_implements($backend)))) { $backendObject = $backend; } else { self::throwException('backend must be a backend name (string) or an object which implements Zend_Cache_Backend_Interface'); } } if (is_string($frontend)) { $frontendObject = self::_makeFrontend($frontend, $frontendOptions, $customFrontendNaming, $autoload); } else { if (is_object($frontend)) { $frontendObject = $frontend; } else { self::throwException('frontend must be a frontend name (string) or an object'); } } $frontendObject->setBackend($backendObject); return $frontendObject; } /** * Backend Constructor * * @param string $backend * @param array $backendOptions * @param boolean $customBackendNaming * @param boolean $autoload * @return Zend_Cache_Backend */ public static function _makeBackend($backend, $backendOptions, $customBackendNaming = false, $autoload = false) { if (!$customBackendNaming) { $backend = self::_normalizeName($backend); } if (in_array($backend, Zend_Cache::$standardBackends)) { // we use a standard backend $backendClass = 'Zend_Cache_Backend_' . $backend; // security controls are explicit #require_once str_replace('_', DIRECTORY_SEPARATOR, $backendClass) . '.php'; } else { // we use a custom backend if (!preg_match('~^[\w]+$~D', $backend)) { Zend_Cache::throwException("Invalid backend name [$backend]"); } if (!$customBackendNaming) { // we use this boolean to avoid an API break $backendClass = 'Zend_Cache_Backend_' . $backend; } else { $backendClass = $backend; } if (!$autoload) { $file = str_replace('_', DIRECTORY_SEPARATOR, $backendClass) . '.php'; if (!(self::_isReadable($file))) { self::throwException("file $file not found in include_path"); } #require_once $file; } } return new $backendClass($backendOptions); } /** * Frontend Constructor * * @param string $frontend * @param array $frontendOptions * @param boolean $customFrontendNaming * @param boolean $autoload * @return Zend_Cache_Core|Zend_Cache_Frontend */ public static function _makeFrontend($frontend, $frontendOptions = array(), $customFrontendNaming = false, $autoload = false) { if (!$customFrontendNaming) { $frontend = self::_normalizeName($frontend); } if (in_array($frontend, self::$standardFrontends)) { // we use a standard frontend // For perfs reasons, with frontend == 'Core', we can interact with the Core itself $frontendClass = 'Zend_Cache_' . ($frontend != 'Core' ? 'Frontend_' : '') . $frontend; // security controls are explicit #require_once str_replace('_', DIRECTORY_SEPARATOR, $frontendClass) . '.php'; } else { // we use a custom frontend if (!preg_match('~^[\w]+$~D', $frontend)) { Zend_Cache::throwException("Invalid frontend name [$frontend]"); } if (!$customFrontendNaming) { // we use this boolean to avoid an API break $frontendClass = 'Zend_Cache_Frontend_' . $frontend; } else { $frontendClass = $frontend; } if (!$autoload) { $file = str_replace('_', DIRECTORY_SEPARATOR, $frontendClass) . '.php'; if (!(self::_isReadable($file))) { self::throwException("file $file not found in include_path"); } #require_once $file; } } return new $frontendClass($frontendOptions); } /** * Throw an exception * * Note : for perf reasons, the "load" of Zend/Cache/Exception is dynamic * @param string $msg Message for the exception * @throws Zend_Cache_Exception */ public static function throwException($msg, Exception $e = null) { // For perfs reasons, we use this dynamic inclusion #require_once 'Zend/Cache/Exception.php'; throw new Zend_Cache_Exception($msg, 0, $e); } /** * Normalize frontend and backend names to allow multiple words TitleCased * * @param string $name Name to normalize * @return string */ protected static function _normalizeName($name) { $name = ucfirst(strtolower($name)); $name = str_replace(array('-', '_', '.'), ' ', $name); $name = ucwords($name); $name = str_replace(' ', '', $name); if (stripos($name, 'ZendServer') === 0) { $name = 'ZendServer_' . substr($name, strlen('ZendServer')); } return $name; } /** * Returns TRUE if the $filename is readable, or FALSE otherwise. * This function uses the PHP include_path, where PHP's is_readable() * does not. * * Note : this method comes from Zend_Loader (see #ZF-2891 for details) * * @param string $filename * @return boolean */ private static function _isReadable($filename) { if (!$fh = @fopen($filename, 'r', true)) { return false; } @fclose($fh); return true; } }
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