104 lines
3.4 KiB
PHP
104 lines
3.4 KiB
PHP
<?php
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/**
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* CXCache class file
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*
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* @author Wei Zhuo <weizhuo[at]gmail[dot]com>
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* @link http://www.yiiframework.com/
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* @copyright 2008-2013 Yii Software LLC
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* @license http://www.yiiframework.com/license/
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*/
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/**
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* CXCache implements a cache application module based on {@link http://xcache.lighttpd.net/ xcache}.
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*
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* To use this application component, the XCache PHP extension must be loaded.
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* Flush functionality will only work correctly if "xcache.admin.enable_auth" is set to "Off" in php.ini.
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*
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* See {@link CCache} manual for common cache operations that are supported by CXCache.
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*
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* @author Wei Zhuo <weizhuo[at]gmail[dot]com>
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* @package system.caching
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*/
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class CXCache extends CCache
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{
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/**
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* Initializes this application component.
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* This method is required by the {@link IApplicationComponent} interface.
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* It checks the availability of memcache.
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* @throws CException if memcache extension is not loaded or is disabled.
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*/
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public function init()
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{
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parent::init();
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if(!function_exists('xcache_isset'))
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throw new CException(Yii::t('yii','CXCache requires PHP XCache extension to be loaded.'));
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}
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/**
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* Retrieves a value from cache with a specified key.
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* This is the implementation of the method declared in the parent class.
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* @param string $key a unique key identifying the cached value
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* @return string|boolean the value stored in cache, false if the value is not in the cache or expired.
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*/
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protected function getValue($key)
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{
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return xcache_isset($key) ? xcache_get($key) : false;
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}
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/**
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* Stores a value identified by a key in cache.
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* This is the implementation of the method declared in the parent class.
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*
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* @param string $key the key identifying the value to be cached
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* @param string $value the value to be cached
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* @param integer $expire the number of seconds in which the cached value will expire. 0 means never expire.
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* @return boolean true if the value is successfully stored into cache, false otherwise
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*/
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protected function setValue($key,$value,$expire)
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{
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return xcache_set($key,$value,$expire);
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}
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/**
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* Stores a value identified by a key into cache if the cache does not contain this key.
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* This is the implementation of the method declared in the parent class.
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*
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* @param string $key the key identifying the value to be cached
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* @param string $value the value to be cached
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* @param integer $expire the number of seconds in which the cached value will expire. 0 means never expire.
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* @return boolean true if the value is successfully stored into cache, false otherwise
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*/
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protected function addValue($key,$value,$expire)
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{
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return !xcache_isset($key) ? $this->setValue($key,$value,$expire) : false;
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}
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/**
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* Deletes a value with the specified key from cache
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* This is the implementation of the method declared in the parent class.
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* @param string $key the key of the value to be deleted
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* @return boolean if no error happens during deletion
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*/
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protected function deleteValue($key)
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{
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return xcache_unset($key);
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}
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/**
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* Deletes all values from cache.
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* This is the implementation of the method declared in the parent class.
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* @return boolean whether the flush operation was successful.
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* @since 1.1.5
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*/
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protected function flushValues()
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{
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for($i=0, $max=xcache_count(XC_TYPE_VAR); $i<$max; $i++)
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{
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if(xcache_clear_cache(XC_TYPE_VAR, $i)===false)
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return false;
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}
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return true;
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}
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}
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