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<?php /** * CDummyCache class file. * * @author Qiang Xue <qiang.xue@gmail.com> * @link http://www.yiiframework.com/ * @copyright 2008-2013 Yii Software LLC * @license http://www.yiiframework.com/license/ */ /** * CDummyCache is a placeholder cache component. * * CDummyCache does not cache anything. It is provided so that one can always configure * a 'cache' application component and he does not need to check if Yii::app()->cache is null or not. * By replacing CDummyCache with some other cache component, one can quickly switch from * non-caching mode to caching mode. * * @author Qiang Xue <qiang.xue@gmail.com> * @package system.caching * @since 1.0 */ class CDummyCache extends CApplicationComponent implements ICache, ArrayAccess { /** * @var string a string prefixed to every cache key so that it is unique. Defaults to {@link CApplication::getId() application ID}. */ public $keyPrefix; /** * Initializes the application component. * This method overrides the parent implementation by setting default cache key prefix. */ public function init() { parent::init(); if($this->keyPrefix===null) $this->keyPrefix=Yii::app()->getId(); } /** * Retrieves a value from cache with a specified key. * @param string $id a key identifying the cached value * @return mixed the value stored in cache, false if the value is not in the cache, expired or the dependency has changed. */ public function get($id) { return false; } /** * Retrieves multiple values from cache with the specified keys. * Some caches (such as memcache, apc) allow retrieving multiple cached values at one time, * which may improve the performance since it reduces the communication cost. * In case a cache doesn't support this feature natively, it will be simulated by this method. * @param array $ids list of keys identifying the cached values * @return array list of cached values corresponding to the specified keys. The array * is returned in terms of (key,value) pairs. * If a value is not cached or expired, the corresponding array value will be false. */ public function mget($ids) { $results=array(); foreach($ids as $id) $results[$id]=false; return $results; } /** * Stores a value identified by a key into cache. * If the cache already contains such a key, the existing value and * expiration time will be replaced with the new ones. * * @param string $id the key identifying the value to be cached * @param mixed $value the value to be cached * @param integer $expire the number of seconds in which the cached value will expire. 0 means never expire. * @param ICacheDependency $dependency dependency of the cached item. If the dependency changes, the item is labeled invalid. * @return boolean true if the value is successfully stored into cache, false otherwise */ public function set($id,$value,$expire=0,$dependency=null) { return true; } /** * Stores a value identified by a key into cache if the cache does not contain this key. * Nothing will be done if the cache already contains the key. * @param string $id the key identifying the value to be cached * @param mixed $value the value to be cached * @param integer $expire the number of seconds in which the cached value will expire. 0 means never expire. * @param ICacheDependency $dependency dependency of the cached item. If the dependency changes, the item is labeled invalid. * @return boolean true if the value is successfully stored into cache, false otherwise */ public function add($id,$value,$expire=0,$dependency=null) { return true; } /** * Deletes a value with the specified key from cache * @param string $id the key of the value to be deleted * @return boolean if no error happens during deletion */ public function delete($id) { return true; } /** * Deletes all values from cache. * Be careful of performing this operation if the cache is shared by multiple applications. * @return boolean whether the flush operation was successful. * @throws CException if this method is not overridden by child classes */ public function flush() { return true; } /** * Returns whether there is a cache entry with a specified key. * This method is required by the interface ArrayAccess. * @param string $id a key identifying the cached value * @return boolean */ public function offsetExists($id) { return false; } /** * Retrieves the value from cache with a specified key. * This method is required by the interface ArrayAccess. * @param string $id a key identifying the cached value * @return mixed the value stored in cache, false if the value is not in the cache or expired. */ public function offsetGet($id) { return false; } /** * Stores the value identified by a key into cache. * If the cache already contains such a key, the existing value will be * replaced with the new ones. To add expiration and dependencies, use the set() method. * This method is required by the interface ArrayAccess. * @param string $id the key identifying the value to be cached * @param mixed $value the value to be cached */ public function offsetSet($id, $value) { } /** * Deletes the value with the specified key from cache * This method is required by the interface ArrayAccess. * @param string $id the key of the value to be deleted * @return boolean if no error happens during deletion */ public function offsetUnset($id) { } }
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