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Diffstat (limited to 'lib/prado/framework/Caching/TAPCCache.php')
| -rw-r--r-- | lib/prado/framework/Caching/TAPCCache.php | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/lib/prado/framework/Caching/TAPCCache.php b/lib/prado/framework/Caching/TAPCCache.php new file mode 100644 index 0000000..2274412 --- /dev/null +++ b/lib/prado/framework/Caching/TAPCCache.php @@ -0,0 +1,127 @@ +<?php +/** + * TAPCCache class file + * + * @author Alban Hanry <compte_messagerie@hotmail.com> + * @link https://github.com/pradosoft/prado + * @copyright Copyright © 2005-2015 The PRADO Group + * @license https://github.com/pradosoft/prado/blob/master/COPYRIGHT + * @package System.Caching + */ + +/** + * 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 System.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'); + } +} + |