state = madmin.DriveStatePermission
	case errors.Is(err, errFaultyDisk):
		state = madmin.DriveStateFaulty
	case errors.Is(err, errDriveIsRoot):
		state = madmin.DriveStateRootMount
	case err == nil:
		state = madmin.DriveStateOk
	default:
		state = fmt.Sprintf("%s (cause: %s)", madmin.DriveStateUnknown, err)
	}

	return state
}

    checkState(state != State.FAILED);
    switch (state) {
      case DONE:
        return false;
      case READY:
        return true;
      default:
    }
    return tryToComputeNext();
  }

  private boolean tryToComputeNext() {
    state = State.FAILED; // temporary pessimism
    next = computeNext();
    if (state != State.DONE) {
      state = State.READY;
      return true;
    }

              + this
              + " to reach a terminal state. "
              + "Current state: "
              + state());
    }
  }

  /** Checks that the current state is equal to the expected state. */
  @GuardedBy("monitor")
  private void checkCurrentState(State expected) {
    State actual = state();
    if (actual != expected) {
      if (actual == FAILED) {

            for (int state : disconnectedStates) {
                transport.setState(state);
                assertTrue(transport.isDisconnected(), "State " + state + " should be disconnected");
            }

            for (int state : connectedStates) {
                transport.setState(state);
                assertFalse(transport.isDisconnected(), "State " + state + " should not be disconnected");
            }

        if (state != RdmaConnectionState.ESTABLISHED && state != RdmaConnectionState.CONNECTED) {
            throw new IOException("Connection not established");
        }

        try {
            while (data.hasRemaining()) {
                socketChannel.write(data);
            }
        } catch (IOException e) {
            state = RdmaConnectionState.ERROR;

        } catch (Exception e) {
            state = RdmaConnectionState.ERROR;
            throw new IOException("DiSNI RDMA send failed", e);
        }
    }

    @Override
    public ByteBuffer receive(int timeout) throws IOException {
        if (state != RdmaConnectionState.ESTABLISHED && state != RdmaConnectionState.CONNECTED) {

    private static List<String> visitAll(
            Collection<Vertex> children, Map<Vertex, DfsState> stateMap, List<String> list) {
        for (Vertex v : children) {
            DfsState state = stateMap.putIfAbsent(v, DfsState.VISITING);
            if (state == null) {
                visitAll(v.children, stateMap, list);
                stateMap.put(v, DfsState.VISITED);
                list.add(v.label);
            }
        }

        State currentState = state.get();

        if (currentState == State.OPEN && shouldAttemptReset()) {
            transitionTo(State.HALF_OPEN);
            currentState = State.HALF_OPEN;
        }

        if (currentState == State.OPEN) {
            throw new CircuitOpenException("Circuit breaker '" + name + "' is open");
        }

  }

  private boolean tryToComputeNext() {
    state = State.FAILED; // temporary pessimism
    next = computeNext();
    if (state != State.DONE) {
      state = State.READY;
      return true;
    }
    return false;
  }

  @CanIgnoreReturnValue // TODO(kak): Should we remove this?
  @Override
  @ParametricNullness
  public final T next() {
    if (!hasNext()) {

    /**
     * Gets the registration state.
     *
     * @return the current registration state
     */
    public WitnessRegistrationState getState() {
        return state;
    }

    /**
     * Sets the registration state.
     *
     * @param state the new registration state
     */
    public void setState(WitnessRegistrationState state) {
        this.state = state;
    }

    /**