<?php /** * TEACache class file * * @author Dario rigolin <drigolin@e-portaltech.it> * @link http://www.pradosoft.com/ * @copyright Copyright © 2005-2014 PradoSoft * @license http://www.pradosoft.com/license/ * @package System.Caching */ /** * TEACache class * * TEACache implements a cache application module based on {@link http://eaccelerator.net/ eAccelerator}. * * By definition, cache does not ensure the existence of a value * even if it never expires. Cache is not meant to be an persistent storage. * * To use this module, the eAccelerator PHP extension must be loaded and enabled * * Please note that as of v0.9.6, eAccelerator no longer supports data caching. * This means if you still want to use this component, your eAccelerator should be of 0.9.5.x or lower version. * * Some usage examples of TEACache are as follows, * <code> * $cache=new TEACache; // TEACache may also be loaded as a Prado application module * $cache->init(null); * $cache->add('object',$object); * $object2=$cache->get('object'); * </code> * * If loaded, TEACache will register itself with {@link TApplication} as the * cache module. It can be accessed via {@link TApplication::getCache()}. * * TEACache may be configured in application configuration file as follows * <code> * <module id="cache" class="System.Caching.TEACache" /> * </code> * * @author Dario Rigolin <drigolin@e-portaltech.it> * @package System.Caching * @since 3.2.2 */ class TEACache extends TCache { /** * Initializes this module. * This method is required by the IModule interface. * @param TXmlElement configuration for this module, can be null * @throws TConfigurationException if eaccelerator extension is not installed or not started, check your php.ini */ public function init($config) { if(!function_exists('eaccelerator_get')) throw new TConfigurationException('eacceleratorcache_extension_required'); parent::init($config); } /** * Retrieves a value from cache with a specified key. * This is the implementation of the method declared in the parent class. * @param string a unique key identifying the cached value * @return string the value stored in cache, false if the value is not in the cache or expired. */ protected function getValue($key) { $value = eaccelerator_get($key); return ($value === null) ? false : $value; } /** * Stores a value identified by a key in cache. * This is the implementation of the method declared in the parent class. * * @param string the key identifying the value to be cached * @param string the value to be cached * @param integer the number of seconds in which the cached value will expire. 0 means never expire. * @return boolean true if the value is successfully stored into cache, false otherwise */ protected function setValue($key,$value,$expire) { return eaccelerator_put($key,$value,$expire); } /** * Stores a value identified by a key into cache if the cache does not contain this key. * This is the implementation of the method declared in the parent class. * * @param string the key identifying the value to be cached * @param string the value to be cached * @param integer the number of seconds in which the cached value will expire. 0 means never expire. * @return boolean true if the value is successfully stored into cache, false otherwise */ protected function addValue($key,$value,$expire) { return (null === eaccelerator_get($key)) ? $this->setValue($key,$value,$expire) : false; } /** * Deletes a value with the specified key from cache * This is the implementation of the method declared in the parent class. * @param string the key of the value to be deleted * @return boolean if no error happens during deletion */ protected function deleteValue($key) { return eaccelerator_rm($key); } /** * Deletes all values from cache. * Be careful of performing this operation if the cache is shared by multiple applications. */ public function flush() { // first, remove expired content from cache eaccelerator_gc(); // now, remove leftover cache-keys $keys = eaccelerator_list_keys(); foreach($keys as $key) $this->deleteValue(substr($key['name'], 1)); return true; } }