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<?php |
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/** |
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* This class extends Cache_Lite and offers a form of setting expiring time in a |
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* per file basis. |
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* |
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* This works by setting the file time to 'now + expiration time'. This avoids |
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* having to read and write data from a separate database or file, or to saving |
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* metadata in the header of the cached data. |
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* |
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* Some filesystems may be troublesome. FAT and NTFS systems seem to be accurate |
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* to 2 seconds, and this module has not been tested on NFS or SAMBA filesystems. |
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* |
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* @package Cache_Lite |
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* @author Bruno Barberi Gnecco <[email protected]> |
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*/ |
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require_once('Lite.php'); |
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class Cache_Lite_Timed extends Cache_Lite |
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{ |
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var $_bufferedLifetime; |
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// --- Public methods ---- |
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/** |
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* Constructor |
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* |
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* $options is an assoc. To have a look at availables options, |
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* see the constructor of the Cache_Lite class in 'Cache_Lite.php' |
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* |
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* @param array $options options |
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* @access public |
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*/ |
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function __construct($options = array(NULL)) |
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{ |
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parent::__construct($options); |
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} |
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/** |
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* Save some data in a cache file |
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* |
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* @param string $data data to put in cache (can be another type than strings if automaticSerialization is on) |
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* @param string $id cache id |
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* @param string $group name of the cache group |
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* @param int $lifetime The time in seconds that this entry should live. Defaults to the lifetime |
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* set by the constructor. |
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* @return boolean true if no problem (else : false or a PEAR_Error object) |
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* @access public |
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*/ |
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function save($data, $id = NULL, $group = 'default', $lifetime = null) |
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{ |
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$res = parent::save($data, $id, $group); |
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if ($res === true) { |
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if ($lifetime == null) { |
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$lifetime = $this->_bufferedLifetime; |
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} |
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if ($lifetime == null) { |
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$lifetime = $this->_lifeTime; |
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} |
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$res = $this->_setLastModified(time() + $lifetime); |
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if (is_object($res)) { |
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// $res is a PEAR_Error object |
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if (!($this->_errorHandlingAPIBreak)) { |
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return false; // we return false (old API) |
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} |
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} |
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} |
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return $res; |
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} |
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/** |
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* Sets the ctime/mtime status for a file for the given time. |
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* |
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* @param integer $time Unix timestamp |
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* @return boolean |
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*/ |
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function _setLastModified($time) { |
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if (@touch($this->_file, $time, $time) === false) { |
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return $this->raiseError('Cache_Lite : Unable to write cache file : '.$this->_file, -1); |
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} |
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return true; |
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} |
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/** |
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* Override refresh time function. Returns current time. |
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* |
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*/ |
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function _setRefreshTime() { |
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if (is_null($this->_lifeTime)) { |
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$this->_refreshTime = null; |
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} else { |
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$this->_refreshTime = time(); |
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} |
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} |
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} |
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Corollarium /
cachearium
