protected function _overflowHandler() {
        return $this->_getAdapter()->overflow(
            $this->_cacheKey,
            $this->getUsage() - $this->getSize() + 1,
            $this->getUsage()
        );
    }
protected function _overflowHandler() {
        return $this->_getAdapter()->overflow(
            $this->_cacheKey,
            $this->getUsage() - $this->getSize() + 1,
            $this->getUsage()
        );
    }
protected function _overflowHandler ( ) { return $ this -> _getAdapter ( ) -> overflow ( $ this -> _cacheKey , $ this -> getUsage ( ) - $ this -> getSize ( ) + 1 , $ this -> getUsage ( ) ) ; }
Buffer overflow handler

@param  void
@return boolean
Buffer overflow handler