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<?php
/**
* Translation table cache.
* @author $Author: weizhuo $
* @version $Id$
* @package System.I18N.core
*/
/**
* Load the cache lite library.
*/
require_once(dirname(__FILE__).'/TCache_Lite.php');
/**
* Cache the translation table into the file system.
* It can cache each cataloug+variant or just the whole section.
* @package System.I18N.core
* @author $Author: weizhuo $
* @version $Id$
*/
class MessageCache
{
/**
* Cache Lite instance.
* @var TCache_Lite
*/
protected $cache;
/**
* Caceh life time, default is 1 year.
*/
protected $lifetime = 3153600;
/**
* Create a new Translation cache.
* @param string $cacheDir Directory to store the cache files.
*/
public function __construct($cacheDir)
{
$cacheDir = $cacheDir.'/';
if(!is_dir($cacheDir))
throw new Exception(
'The cache directory '.$cacheDir.' does not exists.'.
'The cache directory must be writable by the server.');
if(!is_writable($cacheDir))
throw new Exception(
'The cache directory '.$cacheDir.' must be writable '.
'by the server.');
$options = array(
'cacheDir' => $cacheDir,
'lifeTime' => $this->getLifeTime(),
'automaticSerialization' => true
);
$this->cache = new TCache_Lite($options);
}
/**
* Get the cache life time.
* @return int Cache life time.
*/
public function getLifeTime()
{
return $this->lifetime;
}
/**
* Set the cache life time.
* @param int $time Cache life time.
*/
public function setLifeTime($time)
{
$this->lifetime = intval($time);
}
/**
* Get the cache file ID based section and locale.
* @param string $catalogue The translation section.
* @param string $culture The translation locale, e.g. "en_AU".
*/
protected function getID($catalogue, $culture)
{
return $catalogue.':'.$culture;
}
/**
* Get the cache file GROUP based section and locale.
* @param string $catalogue The translation section.
* @param string $culture The translation locale, e.g. "en_AU".
*/
protected function getGroup($catalogue, $culture)
{
return $catalogue.':'.get_class($this);
}
/**
* Get the data from the cache.
* @param string $catalogue The translation section.
* @param string $culture The translation locale, e.g. "en_AU".
* @param string $filename If the source is a file, this file's modified
* time is newer than the cache's modified time, no cache hit.
* @return mixed Boolean FALSE if no cache hit. Otherwise, translation
* table data for the specified section and locale.
*/
public function get($catalogue, $culture, $lastmodified=0)
{
$ID = $this->getID($catalogue, $culture);
$group = $this->getGroup($catalogue, $culture);
$this->cache->_setFileName($ID, $group);
$cache = $this->cache->getCacheFile();
if(is_file($cache) == false)
return false;
$lastmodified = intval($lastmodified);
if($lastmodified <= 0 || $lastmodified > filemtime($cache))
return false;
//echo '@@ Cache hit: "'.$ID.'" : "'.$group.'"';
//echo "<br>\n";
return $this->cache->get($ID, $group);
}
/**
* Save the data to cache for the specified section and locale.
* @param array $data The data to save.
* @param string $catalogue The translation section.
* @param string $culture The translation locale, e.g. "en_AU".
*/
public function save($data, $catalogue, $culture)
{
$ID = $this->getID($catalogue, $culture);
$group = $this->getGroup($catalogue, $culture);
//echo '## Cache save: "'.$ID.'" : "'.$group.'"';
//echo "<br>\n";
return $this->cache->save($data, $ID, $group);
}
/**
* Clean up the cache for the specified section and locale.
* @param string $catalogue The translation section.
* @param string $culture The translation locale, e.g. "en_AU".
*/
public function clean($catalogue, $culture)
{
$group = $this->getGroup($catalogue, $culture);
$this->cache->clean($group);
}
/**
* Flush the cache. Deletes all the cache files.
*/
public function clear()
{
$this->cache->clean();
}
}
?>
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