public int getConversationCount(HttpUrl url) {
public int getConversationCount() {
        public int getConversationCount(HttpUrl url) {            if (_store == null) return 0;            try {                readLock().acquire();                try {                    return _store.getConversationCount(url);                } finally {                    readLock().release();                }            } catch (InterruptedException ie) {                _logger.severe("Interrupted! " + ie);                return 0;            }        }