code: public long ticketKeyResume() {
          Lock readerLock = context.ctxLock.readLock();
          readerLock.lock();
          try {
              return SSLContext.sessionTicketKeyResume(context.ctx);
          } finally {
              readerLock.unlock();
          }
      }
docs: Returns the number of times a client presented a ticket derived from the primary key.