mirror of
https://github.com/kamilwylegala/cakephp2-php8.git
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9fdd1c3630
git-svn-id: https://svn.cakephp.org/repo/branches/1.2.x.x@5793 3807eeeb-6ff5-0310-8944-8be069107fe0
401 lines
No EOL
10 KiB
PHP
401 lines
No EOL
10 KiB
PHP
<?php
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/* SVN FILE: $Id$ */
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/**
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* Caching for CakePHP.
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*
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*
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* PHP versions 4 and 5
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*
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* CakePHP(tm) : Rapid Development Framework <http://www.cakephp.org/>
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* Copyright 2005-2007, Cake Software Foundation, Inc.
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* 1785 E. Sahara Avenue, Suite 490-204
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* Las Vegas, Nevada 89104
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*
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* Licensed under The MIT License
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* Redistributions of files must retain the above copyright notice.
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*
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* @filesource
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* @copyright Copyright 2005-2007, Cake Software Foundation, Inc.
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* @link http://www.cakefoundation.org/projects/info/cakephp CakePHP(tm) Project
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* @package cake
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* @subpackage cake.cake.libs
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* @since CakePHP(tm) v 1.2.0.4933
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* @version $Revision$
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* @modifiedby $LastChangedBy$
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* @lastmodified $Date$
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* @license http://www.opensource.org/licenses/mit-license.php The MIT License
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*/
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/**
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* Included libraries.
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*/
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if (!class_exists('object')) {
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uses('object');
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}
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/**
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* Caching for CakePHP.
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*
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* @package cake
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* @subpackage cake.cake.libs
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*/
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class Cache extends Object {
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/**
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* Cache engine to use
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*
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* @var object
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* @access protected
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*/
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var $_Engine = null;
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/**
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* Cache configuration stack
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*
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* @var array
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* @access private
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*/
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var $__config = array();
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/**
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* Holds name of the current configuration being used
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*
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* @var array
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* @access private
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*/
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var $__currentConfig = null;
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/**
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* Returns a singleton instance
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*
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* @return object
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* @access public
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*/
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function &getInstance() {
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static $instance = array();
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if (!isset($instance[0]) || !$instance[0]) {
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$instance[0] =& new Cache();
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}
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return $instance[0];
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}
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/**
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* Tries to find and include a file for a cache engine and returns object instance
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*
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* @param $name Name of the engine (without 'Engine')
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* @return mixed $engine object or null
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* @access private
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*/
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function __loadEngine($name) {
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if (!class_exists($name . 'Engine')) {
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$fileName = LIBS . DS . 'cache' . DS . strtolower($name) . '.php';
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if (!require($fileName)) {
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return false;
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}
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}
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return true;
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}
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/**
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* Set the cache configuration to use
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*
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* @see app/config/core.php for configuration settings
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* @param string $name Name of the configuration
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* @param array $settings Optional associative array of settings passed to the engine
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* @return array(engine, settings) on success, false on failure
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* @access public
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*/
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function config($name = 'default', $settings = array()) {
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$_this =& Cache::getInstance();
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if(is_array($name)) {
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extract($name);
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}
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if(isset($_this->__config[$name])) {
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$settings = array_merge($_this->__config[$name], $settings);
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} elseif (is_string($name) && !empty($settings)) {
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$_this->__config[$name] = $settings;
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} else {
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$name = 'default';
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$settings = $_this->__config['default'];
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}
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$engine = 'File';
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if(!empty($settings['engine'])) {
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$engine = $settings['engine'];
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}
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if($name !== $_this->__currentConfig) {
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if($_this->engine($engine, $settings) === false) {
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return false;
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}
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$_this->__currentConfig = $name;
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$_this->__config[$name] = array_merge(array('engine' => $engine), $_this->settings($engine));
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}
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$settings = $_this->__config[$name];
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return compact('engine', 'settings');
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}
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/**
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* Set the cache engine to use or modify settings for one instance
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*
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* @param string $name Name of the engine (without 'Engine')
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* @param array $settings Optional associative array of settings passed to the engine
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* @return boolean True on success, false on failure
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* @access public
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*/
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function engine($name = 'File', $settings = array()) {
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if (!$name || Configure::read('Cache.disable')) {
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return false;
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}
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$cacheClass = $name . 'Engine';
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$_this =& Cache::getInstance();
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if (!isset($_this->_Engine[$name])) {
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if ($_this->__loadEngine($name) === false) {
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return false;
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}
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$_this->_Engine[$name] =& new $cacheClass();
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}
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if ($_this->_Engine[$name]->init($settings)) {
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if (time() % $_this->_Engine[$name]->settings['probability'] == 0) {
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$_this->_Engine[$name]->gc();
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}
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return true;
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}
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$_this->_Engine[$name] = null;
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return false;
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}
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/**
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* Write data for key into cache
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*
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* @param string $key Identifier for the data
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* @param mixed $value Data to be cached - anything except a resource
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* @param mixed $duration Optional - string configuration name OR how long to cache the data, either in seconds or a
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* string that can be parsed by the strtotime() function OR array('config' => 'default', 'duration' => '3600')
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* @return boolean True if the data was successfully cached, false on failure
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* @access public
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*/
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function write($key, $value, $duration = null) {
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$_this =& Cache::getInstance();
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if(is_array($duration)) {
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extract($duration);
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} else {
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$config = $duration;
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}
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$config = $_this->config($config);
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extract($config);
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if (!$_this->isInitialized($engine)) {
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return false;
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}
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$key = strval($key);
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if (empty($key)) {
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return false;
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}
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if (is_resource($value)) {
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return false;
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}
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if(!$duration) {
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$duration = $settings['duration'];
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}
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$duration = ife(is_string($duration), strtotime($duration) - time(), intval($duration));
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if ($duration < 1) {
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return false;
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}
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$success = $_this->_Engine[$engine]->write($key, $value, $duration);
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$_this->_Engine[$engine]->init($settings);
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return $success;
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}
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/**
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* Read a key from the cache
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*
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* @param string $key Identifier for the data
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* @param string $config name of the configuration to use
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* @return mixed The cached data, or false if the data doesn't exist, has expired, or if there was an error fetching it
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* @access public
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*/
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function read($key, $config = null) {
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$_this =& Cache::getInstance();
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$config = $_this->config($config);
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extract($config);
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if (!$_this->isInitialized($engine)) {
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return false;
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}
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$key = strval($key);
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if (empty($key)) {
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return false;
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}
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$success = $_this->_Engine[$engine]->read($key);
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$_this->_Engine[$engine]->init($settings);
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return $success;
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}
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/**
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* Delete a key from the cache
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*
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* @param string $key Identifier for the data
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* @param string $config name of the configuration to use
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* @return boolean True if the value was succesfully deleted, false if it didn't exist or couldn't be removed
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* @access public
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*/
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function delete($key, $config = null) {
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$_this =& Cache::getInstance();
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$config = $_this->config($config);
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extract($config);
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if (!$_this->isInitialized($engine)) {
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return false;
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}
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$key = strval($key);
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if (empty($key)) {
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return false;
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}
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$success = $_this->_Engine[$engine]->delete($key);
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$_this->_Engine[$engine]->init($settings);
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return $success;
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}
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/**
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* Delete all keys from the cache
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*
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* @param boolean $check if true will check expiration, otherwise delete all
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* @param string $config name of the configuration to use
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* @return boolean True if the cache was succesfully cleared, false otherwise
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* @access public
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*/
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function clear($check = false, $config = null) {
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$_this =& Cache::getInstance();
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$config = $_this->config($config);
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extract($config);
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if (!$_this->isInitialized($engine)) {
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return false;
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}
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$success = $_this->_Engine[$engine]->clear($check);
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$_this->_Engine[$engine]->init($settings);
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return $success;
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}
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/**
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* Check if Cache has initialized a working storage engine
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*
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* @param string $engine Name of the engine
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* @param string $config Name of the configuration setting
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* @return boolean
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* @access public
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*/
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function isInitialized($engine = null) {
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if (Configure::read('Cache.disable')) {
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return false;
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}
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$_this =& Cache::getInstance();
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if(!$engine && $_this->__currentConfig !== null) {
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$engine = $_this->__config[$_this->__currentConfig]['engine'];
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}
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return isset($_this->_Engine[$engine]);
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}
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/**
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* Return the settings for current cache engine
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*
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* @param string $engine Name of the engine
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* @return array list of settings for this engine
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* @access public
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*/
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function settings($engine = 'File') {
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$_this =& Cache::getInstance();
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if(!$engine && isset($_this->__config[$_this->__currentConfig]['engine'])) {
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$engine = $_this->__config[$_this->__currentConfig]['engine'];
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}
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if (isset($_this->_Engine[$engine]) && !is_null($_this->_Engine[$engine])) {
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return $_this->_Engine[$engine]->settings();
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}
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return array();
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}
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}
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/**
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* Storage engine for CakePHP caching
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*
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* @package cake
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* @subpackage cake.cake.libs
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*/
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class CacheEngine extends Object {
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/**
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* settings of current engine instance
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*
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* @var int
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* @access public
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*/
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var $settings;
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/**
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* Iitialize the cache engine
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*
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* Called automatically by the cache frontend
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*
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* @param array $params Associative array of parameters for the engine
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* @return boolean True if the engine has been succesfully initialized, false if not
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* @access public
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*/
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function init($settings = array()) {
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$this->settings = am(array('duration'=> 3600, 'probability'=> 100), $settings);
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return true;
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}
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/**
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* Garbage collection
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*
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* Permanently remove all expired and deleted data
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*
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* @access public
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*/
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function gc() {
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}
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/**
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* Write value for a key into cache
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*
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* @param string $key Identifier for the data
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* @param mixed $value Data to be cached
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* @param mixed $duration How long to cache the data, in seconds
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* @return boolean True if the data was succesfully cached, false on failure
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* @access public
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*/
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function write($key, &$value, $duration) {
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trigger_error(sprintf(__('Method write() not implemented in %s', true), get_class($this)), E_USER_ERROR);
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}
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/**
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* Read a key from the cache
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*
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* @param string $key Identifier for the data
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* @return mixed The cached data, or false if the data doesn't exist, has expired, or if there was an error fetching it
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* @access public
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*/
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function read($key) {
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trigger_error(sprintf(__('Method read() not implemented in %s', true), get_class($this)), E_USER_ERROR);
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}
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/**
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* Delete a key from the cache
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*
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* @param string $key Identifier for the data
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* @return boolean True if the value was succesfully deleted, false if it didn't exist or couldn't be removed
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* @access public
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*/
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function delete($key) {
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}
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/**
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* Delete all keys from the cache
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*
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* @param boolean $check if true will check expiration, otherwise delete all
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* @return boolean True if the cache was succesfully cleared, false otherwise
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* @access public
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*/
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function clear($check) {
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}
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/**
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* Cache Engine settings
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*
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* @return array settings
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* @access public
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*/
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function settings() {
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return $this->settings;
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}
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}
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?>
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