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Diffstat (limited to 'system/libraries/Cache/Cache.php')
| -rw-r--r-- | system/libraries/Cache/Cache.php | 216 |
1 files changed, 216 insertions, 0 deletions
diff --git a/system/libraries/Cache/Cache.php b/system/libraries/Cache/Cache.php new file mode 100644 index 000000000..ea3194237 --- /dev/null +++ b/system/libraries/Cache/Cache.php @@ -0,0 +1,216 @@ +<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed'); +/** + * CodeIgniter + * + * An open source application development framework for PHP 4.3.2 or newer + * + * @package CodeIgniter + * @author ExpressionEngine Dev Team + * @copyright Copyright (c) 2006 - 2010 EllisLab, Inc. + * @license http://codeigniter.com/user_guide/license.html + * @link http://codeigniter.com + * @since Version 2.0 + * @filesource + */ + +// ------------------------------------------------------------------------ + +/** + * CodeIgniter Caching Class + * + * @package CodeIgniter + * @subpackage Libraries + * @category Core + * @author ExpressionEngine Dev Team + * @link + */ +class Cache extends CI_Driver_Library { + + protected $valid_drivers = array( + 'cache_apc', 'cache_file', 'cache_memcached', 'cache_dummy' + ); + + protected $_cache_path = NULL; // Path of cache files (if file-based cache) + protected $_adapter = 'dummy'; + protected $_backup_driver; + + // ------------------------------------------------------------------------ + + /** + * Constructor + * + * @param array + */ + public function __construct($config = array()) + { + if ( ! empty($config)) + { + $this->_initialize($config); + } + } + + // ------------------------------------------------------------------------ + + /** + * Get + * + * Look for a value in the cache. If it exists, return the data + * if not, return FALSE + * + * @param string + * @return mixed value that is stored/FALSE on failure + */ + public function get($id) + { + return $this->{$this->_adapter}->get($id); + } + + // ------------------------------------------------------------------------ + + /** + * Cache Save + * + * @param string Unique Key + * @param mixed Data to store + * @param int Length of time (in seconds) to cache the data + * + * @return boolean true on success/false on failure + */ + public function save($id, $data, $ttl = 60) + { + return $this->{$this->_adapter}->save($id, $data, $ttl); + } + + // ------------------------------------------------------------------------ + + /** + * Delete from Cache + * + * @param mixed unique identifier of the item in the cache + * @return boolean true on success/false on failure + */ + public function delete($id) + { + return $this->{$this->_adapter}->delete($id); + } + + // ------------------------------------------------------------------------ + + /** + * Clean the cache + * + * @return boolean false on failure/true on success + */ + public function clean() + { + return $this->{$this->_adapter}->clean(); + } + + // ------------------------------------------------------------------------ + + /** + * Cache Info + * + * @param string user/filehits + * @return mixed array on success, false on failure + */ + public function cache_info($type = 'user') + { + return $this->{$this->_adapter}->cache_info($type); + } + + // ------------------------------------------------------------------------ + + /** + * Get Cache Metadata + * + * @param mixed key to get cache metadata on + * @return mixed return value from child method + */ + public function get_metadata($id) + { + return $this->{$this->_adapter}->get_metadata($id); + } + + // ------------------------------------------------------------------------ + + /** + * Initialize + * + * Initialize class properties based on the configuration array. + * + * @param array + * @return void + */ + private function _initialize($config) + { + $default_config = array( + 'adapter', + 'memcached' + ); + + foreach ($default_config as $key) + { + if (isset($config[$key])) + { + $param = '_'.$key; + + $this->{$param} = $config[$key]; + } + } + + if (isset($config['backup'])) + { + if (in_array('cache_'.$config['backup'], $this->valid_drivers)) + { + $this->_backup_driver = $config['backup']; + } + } + } + + // ------------------------------------------------------------------------ + + /** + * Is the requested driver supported in this environment? + * + * @param string The driver to test. + * @return array + */ + public function is_supported($driver) + { + static $support = array(); + + if ( ! isset($support[$driver])) + { + $support[$driver] = $this->{$driver}->is_supported(); + } + + return $support[$driver]; + } + + // ------------------------------------------------------------------------ + + /** + * __get() + * + * @param child + * @return object + */ + public function __get($child) + { + $obj = parent::__get($child); + + if ( ! $this->is_supported($child)) + { + $this->_adapter = $this->_backup_driver; + } + + return $obj; + } + + // ------------------------------------------------------------------------ +} +// End Class + +/* End of file Cache.php */ +/* Location: ./system/libraries/Cache/Cache.php */
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