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<?php
class APCDataStore implements DataStore
{
private static $website_id = false;
private $cache_id;
private static $apc_fields_id = '_apc_fields';
private $apc_fields = array();
public function __construct($cache_id)
{
$this->cache_id = self::get_website_id() . '-' . $cache_id;
$this->retrieve_apc_fields();
}
public function get($id)
{
$id = $this->get_full_object_id($id);
$found = false;
$object = apc_fetch($id, $found);
if (!$found)
{
throw new DataStoreException($id);
}
return $object;
}
public function contains($id)
{
$id = $this->get_full_object_id($id);
$found = false;
apc_fetch($id, $found);
return $found;
}
public function store($id, $object)
{
$this->add_apc_field($id);
$id = $this->get_full_object_id($id);
return (bool) apc_store($id, $object);
}
public function delete($id)
{
$this->delete_apc_field($id);
$id = $this->get_full_object_id($id);
return apc_delete($id);
}
private function get_full_object_id($tiny_id)
{
return $this->cache_id . '-' . $tiny_id;
}
private static function get_website_id()
{
if (self::$website_id === false)
{
$website_id_cache_file = PATH_TO_ROOT . '/cache/website_id.cfg';
if (file_exists($website_id_cache_file))
{
self::$website_id = @file_get_contents($website_id_cache_file);
}
if (self::$website_id === false)
{
self::$website_id = TextHelper::substr(md5(realpath(PATH_TO_ROOT)), 0, 10);
$file = new File($website_id_cache_file);
$file->write(self::$website_id);
$file->close();
}
}
return self::$website_id;
}
public function clear()
{
$apc_fields = $this->apc_fields;
foreach ($apc_fields as $apc_field)
{
$this->delete($apc_field);
}
}
private function retrieve_apc_fields()
{
if ($this->contains(self::$apc_fields_id))
{
$this->apc_fields = $this->get(self::$apc_fields_id);
}
else
{
$this->apc_fields = array();
}
}
private function add_apc_field($field_name)
{
if (!in_array($field_name, $this->apc_fields))
{
$this->apc_fields[] = $field_name;
$this->store(self::$apc_fields_id, $this->apc_fields);
}
}
private function delete_apc_field($field_name)
{
$value_index = array_search($field_name, $this->apc_fields);
if ($value_index !== false)
{
unset($this->apc_fields[$value_index]);
$this->store(self::$apc_fields_id, $this->apc_fields);
}
}
}
?>