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<?php
/**
* Core interfaces essential for TApplication class.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @link http://www.pradosoft.com/
* @copyright Copyright © 2005-2014 PradoSoft
* @license http://www.pradosoft.com/license/
* @package System
*/
/**
* ICache interface.
*
* This interface must be implemented by cache managers.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @package System
* @since 3.0
*/
interface ICache
{
/**
* Retrieves a value from cache with a specified key.
* @param string 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 get($id);
/**
* Stores a value identified by a key into cache.
* If the cache already contains such a key, the existing value and
* expiration time will be replaced with the new ones.
*
* @param string the key identifying the value to be cached
* @param mixed the value to be cached
* @param integer the number of seconds in which the cached value will expire. 0 means never expire.
* @param ICacheDependency dependency of the cached item. If the dependency changes, the item is labelled invalid.
* @return boolean true if the value is successfully stored into cache, false otherwise
*/
public function set($id,$value,$expire=0,$dependency=null);
/**
* Stores a value identified by a key into cache if the cache does not contain this key.
* Nothing will be done if the cache already contains the key.
* @param string the key identifying the value to be cached
* @param mixed the value to be cached
* @param integer the number of seconds in which the cached value will expire. 0 means never expire.
* @param ICacheDependency dependency of the cached item. If the dependency changes, the item is labelled invalid.
* @return boolean true if the value is successfully stored into cache, false otherwise
*/
public function add($id,$value,$expire=0,$dependency=null);
/**
* Deletes a value with the specified key from cache
* @param string the key of the value to be deleted
* @return boolean if no error happens during deletion
*/
public function delete($id);
/**
* Deletes all values from cache.
* Be careful of performing this operation if the cache is shared by multiple applications.
*/
public function flush();
}
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