1: <?php
  2: /**
  3:  * CApcCache class file
  4:  *
  5:  * @author Qiang Xue <qiang.xue@gmail.com>
  6:  * @link http://www.yiiframework.com/
  7:  * @copyright 2008-2013 Yii Software LLC
  8:  * @license http://www.yiiframework.com/license/
  9:  */
 10: 
 11: /**
 12:  * CApcCache provides APC caching in terms of an application component.
 13:  *
 14:  * The caching is based on {@link http://www.php.net/apc APC}.
 15:  * To use this application component, the APC PHP extension must be loaded.
 16:  *
 17:  * See {@link CCache} manual for common cache operations that are supported by CApcCache.
 18:  *
 19:  * @author Qiang Xue <qiang.xue@gmail.com>
 20:  * @package system.caching
 21:  * @since 1.0
 22:  */
 23: class CApcCache extends CCache
 24: {
 25:     /**
 26:      * Initializes this application component.
 27:      * This method is required by the {@link IApplicationComponent} interface.
 28:      * It checks the availability of APC.
 29:      * @throws CException if APC cache extension is not loaded or is disabled.
 30:      */
 31:     public function init()
 32:     {
 33:         parent::init();
 34:         if(!extension_loaded('apc'))
 35:             throw new CException(Yii::t('yii','CApcCache requires PHP apc extension to be loaded.'));
 36:     }
 37: 
 38:     /**
 39:      * Retrieves a value from cache with a specified key.
 40:      * This is the implementation of the method declared in the parent class.
 41:      * @param string $key a unique key identifying the cached value
 42:      * @return string|boolean the value stored in cache, false if the value is not in the cache or expired.
 43:      */
 44:     protected function getValue($key)
 45:     {
 46:         return apc_fetch($key);
 47:     }
 48: 
 49:     /**
 50:      * Retrieves multiple values from cache with the specified keys.
 51:      * @param array $keys a list of keys identifying the cached values
 52:      * @return array a list of cached values indexed by the keys
 53:      */
 54:     protected function getValues($keys)
 55:     {
 56:         return apc_fetch($keys);
 57:     }
 58: 
 59:     /**
 60:      * Stores a value identified by a key in cache.
 61:      * This is the implementation of the method declared in the parent class.
 62:      *
 63:      * @param string $key the key identifying the value to be cached
 64:      * @param string $value the value to be cached
 65:      * @param integer $expire the number of seconds in which the cached value will expire. 0 means never expire.
 66:      * @return boolean true if the value is successfully stored into cache, false otherwise
 67:      */
 68:     protected function setValue($key,$value,$expire)
 69:     {
 70:         return apc_store($key,$value,$expire);
 71:     }
 72: 
 73:     /**
 74:      * Stores a value identified by a key into cache if the cache does not contain this key.
 75:      * This is the implementation of the method declared in the parent class.
 76:      *
 77:      * @param string $key the key identifying the value to be cached
 78:      * @param string $value the value to be cached
 79:      * @param integer $expire the number of seconds in which the cached value will expire. 0 means never expire.
 80:      * @return boolean true if the value is successfully stored into cache, false otherwise
 81:      */
 82:     protected function addValue($key,$value,$expire)
 83:     {
 84:         return apc_add($key,$value,$expire);
 85:     }
 86: 
 87:     /**
 88:      * Deletes a value with the specified key from cache
 89:      * This is the implementation of the method declared in the parent class.
 90:      * @param string $key the key of the value to be deleted
 91:      * @return boolean if no error happens during deletion
 92:      */
 93:     protected function deleteValue($key)
 94:     {
 95:         return apc_delete($key);
 96:     }
 97: 
 98:     /**
 99:      * Deletes all values from cache.
100:      * This is the implementation of the method declared in the parent class.
101:      * @return boolean whether the flush operation was successful.
102:      * @since 1.1.5
103:      */
104:     protected function flushValues()
105:     {
106:         if(extension_loaded('apcu'))
107:             return apc_clear_cache();
108: 
109:         return apc_clear_cache('user');
110:     }
111: }
112: