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<?php
class SemanticScuttle_Service_Cache extends SemanticScuttle_Service
{
var $basedir;
var $fileextension = '.cache';
/**
* Returns the single service instance
*
* @param DB $db Database object
*
* @return SemanticScuttle_Service
*/
public static function getInstance($db)
{
static $instance;
if (!isset($instance)) {
$instance = new self($db);
}
return $instance;
}
protected function __construct()
{
$this->basedir = $GLOBALS['dir_cache'];
}
function Start($hash, $time = 300) {
$cachefile = $this->basedir .'/'. $hash . $this->fileextension;
if (file_exists($cachefile) && time() < filemtime($cachefile) + $time) {
@readfile($cachefile);
echo "\n<!-- Cached: ". date('r', filemtime($cachefile)) ." -->\n";
unset($cachefile);
exit;
}
ob_start("ob_gzhandler");
}
function End($hash) {
$cachefile = $this->basedir .'/'. $hash . $this->fileextension;
$handle = fopen($cachefile, 'w');
fwrite($handle, ob_get_contents());
fclose($handle);
ob_flush();
}
}
?>
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