code: void close() {
          try {
              performTeardownExchange();
          } catch (IOException e) {
              logger.warn("Problem reporting our intention to close the dbserver connection", e);
          }
          try {
              channel.close();
          } catch (IOException e) {
              logger.warn("Problem closing dbserver client output channel", e);
          }
          try {
              os.close();
          } catch (IOException e) {
              logger.warn("Problem closing dbserver client output stream", e);
          }
          try {
              is.close();
          } catch (IOException e) {
              logger.warn("Problem closing dbserver client input stream", e);
          }
          try {
              socket.close();
          } catch (IOException e) {
              logger.warn("Problem closing dbserver client socket", e);
          }
      }
docs: Closes the connection to the dbserver. This instance can no longer be used after this action.