public ConversationID getConversationAt(HttpUrl url, int index) {
public ConversationID getConversationAt(int index) {
        public ConversationID getConversationAt(HttpUrl url, int index) {            try {                _rwl.readLock().acquire();                return (ConversationID) _compared.get(index);            } catch (InterruptedException ie) {                _logger.warning("Interrupted! " + ie);                return null;            } finally {                _rwl.readLock().release();            }        }