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<?php
/**
* ICache interface.
*
* This interface must be implemented by cache managers.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @version $Revision: $ $Date: $
* @package System.Data
* @since 3.0
*/
interface ICache
{
/**
* Retrieves a value from cache with a specified key.
* @return mixed the value stored in cache, false if the value is not in the cache or expired.
*/
public function get($id);
/**
* Stores a value identified by a key into cache.
* If the cache already contains such a key, the existing value and
* expiration time will be replaced with the new ones.
*
* @param string the key identifying the value to be cached
* @param mixed the value to be cached
* @param integer the expiration time of the value,
* 0 means never expire,
* a number less or equal than 60*60*24*30 means the number of seconds that the value will remain valid.
* a number greater than 60*60*24*30 means a UNIX timestamp after which the value will expire.
* @return boolean true if the value is successfully stored into cache, false otherwise
*/
public function set($id,$value,$expire=0);
/**
* 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 expiration time of the value,
* 0 means never expire,
* a number less or equal than 60*60*24*30 means the number of seconds that the value will remain valid.
* a number greater than 60*60*24*30 means a UNIX timestamp after which the value will expire.
* @return boolean true if the value is successfully stored into cache, false otherwise
*/
public function add($id,$value,$expire=0);
/**
* Stores a value identified by a key into cache only if the cache contains this key.
* The existing value and expiration time will be overwritten with the new ones.
* @param string the key identifying the value to be cached
* @param mixed the value to be cached
* @param integer the expiration time of the value,
* 0 means never expire,
* a number less or equal than 60*60*24*30 means the number of seconds that the value will remain valid.
* a number greater than 60*60*24*30 means a UNIX timestamp after which the value will expire.
* @return boolean true if the value is successfully stored into cache, false otherwise
*/
public function replace($id,$value,$expire=0);
/**
* 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();
}
interface IDependency
{
}
class TTimeDependency
{
}
class TFileDependency
{
}
class TDirectoryDependency
{
}
?>
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