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<?php
/**
* TAPCCache class file
*
* @author Alban Hanry <compte_messagerie@hotmail.com>
* @link http://www.pradosoft.com/
* @copyright Copyright © 2005-2014 PradoSoft
* @license http://www.pradosoft.com/license/
* @package Prado\Caching
*/
namespace Prado\Caching;
use Prado\Exceptions\TConfigurationException;
/**
* TAPCCache class
*
* TAPCCache implements a cache application module based on {@link http://www.php.net/apc APC}.
*
* By definition, cache does not ensure the existence of a value
* even if it never expires. Cache is not meant to be an persistent storage.
*
* To use this module, the APC PHP extension must be loaded and set in the php.ini file the following:
* <code>
* apc.cache_by_default=0
* </code>
*
* Some usage examples of TAPCCache are as follows,
* <code>
* $cache=new TAPCCache; // TAPCCache may also be loaded as a Prado application module
* $cache->init(null);
* $cache->add('object',$object);
* $object2=$cache->get('object');
* </code>
*
* If loaded, TAPCCache will register itself with {@link TApplication} as the
* cache module. It can be accessed via {@link TApplication::getCache()}.
*
* TAPCCache may be configured in application configuration file as follows
* <code>
* <module id="cache" class="System.Caching.TAPCCache" />
* </code>
*
* @author Alban Hanry <compte_messagerie@hotmail.com>
* @author Knut Urdalen <knut.urdalen@gmail.com>
* @package Prado\Caching
* @since 3.0b
*/
class TAPCCache extends TCache
{
/**
* Initializes this module.
* This method is required by the IModule interface.
* @param TXmlElement configuration for this module, can be null
* @throws TConfigurationException if apc extension is not installed or not started, check your php.ini
*/
public function init($config)
{
if(!extension_loaded('apc'))
throw new TConfigurationException('apccache_extension_required');
if(ini_get('apc.enabled') == false)
throw new TConfigurationException('apccache_extension_not_enabled');
if(substr(php_sapi_name(), 0, 3) === 'cli' and ini_get('apc.enable_cli') == false)
throw new TConfigurationException('apccache_extension_not_enabled_cli');
parent::init($config);
}
/**
* Retrieves a value from cache with a specified key.
* This is the implementation of the method declared in the parent class.
* @param string a unique key identifying the cached value
* @return string the value stored in cache, false if the value is not in the cache or expired.
*/
protected function getValue($key)
{
return apc_fetch($key);
}
/**
* Stores a value identified by a key in cache.
* This is the implementation of the method declared in the parent class.
*
* @param string the key identifying the value to be cached
* @param string the value to be cached
* @param integer the number of seconds in which the cached value will expire. 0 means never expire.
* @return boolean true if the value is successfully stored into cache, false otherwise
*/
protected function setValue($key,$value,$expire)
{
return apc_store($key,$value,$expire);
}
/**
* Stores a value identified by a key into cache if the cache does not contain this key.
* This is the implementation of the method declared in the parent class.
*
* @param string the key identifying the value to be cached
* @param string the value to be cached
* @param integer the number of seconds in which the cached value will expire. 0 means never expire.
* @return boolean true if the value is successfully stored into cache, false otherwise
*/
protected function addValue($key,$value,$expire)
{
return apc_add($key,$value,$expire);
}
/**
* Deletes a value with the specified key from cache
* This is the implementation of the method declared in the parent class.
* @param string the key of the value to be deleted
* @return boolean if no error happens during deletion
*/
protected function deleteValue($key)
{
return apc_delete($key);
}
/**
* Deletes all values from cache.
* Be careful of performing this operation if the cache is shared by multiple applications.
*/
public function flush()
{
return apc_clear_cache('user');
}
}
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