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105 lines
3.6 KiB
PHP
105 lines
3.6 KiB
PHP
<?php
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/**
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* @link http://www.yiiframework.com/
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* @copyright Copyright (c) 2008 Yii Software LLC
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* @license http://www.yiiframework.com/license/
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*/
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namespace yii\caching;
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/**
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* XCache provides XCache caching in terms of an application component.
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*
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* To use this application component, the [XCache PHP extension](http://xcache.lighttpd.net/) must be loaded.
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* Also note that the [[flush()]] functionality will work correctly only if "xcache.admin.enable_auth"
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* is set to "Off" in php.ini.
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*
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* See [[Cache]] for common cache operations that XCache supports.
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*
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* @author Qiang Xue <qiang.xue@gmail.com>
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* @since 2.0
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*/
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class XCache extends Cache
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{
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/**
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* Checks whether a specified key exists in the cache.
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* This can be faster than getting the value from the cache if the data is big.
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* Note that this method does not check whether the dependency associated
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* with the cached data, if there is any, has changed. So a call to [[get]]
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* may return false while exists returns true.
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* @param mixed $key a key identifying the cached value. This can be a simple string or
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* a complex data structure consisting of factors representing the key.
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* @return boolean true if a value exists in cache, false if the value is not in the cache or expired.
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*/
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public function exists($key)
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{
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$key = $this->buildKey($key);
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return xcache_isset($key);
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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($key);
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}
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/**
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* Deletes all values from cache.
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* This is the implementation of the method declared in the parent class.
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* @return boolean whether the flush operation was successful.
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*/
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protected function flushValues()
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{
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for ($i = 0, $max = xcache_count(XC_TYPE_VAR); $i < $max; $i++) {
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if (xcache_clear_cache(XC_TYPE_VAR, $i) === false) {
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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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