public function __construct(Application $app)
 {
     parent::__construct($app);
     $name = basename(get_class($this));
     $name = strtolower($name);
     $name = str_replace('subscriber', '', $name);
     $this->params = $this->app['config']->get('http-client::subscribers.' . $name . '.config');
     $this->cache =& $this->params['cache'];
     $this->cache_ttl =& $this->params['cache_ttl'];
     $this->store =& $this->app['cache'];
 }