code: @Override
      public DescribeStateMachineResult describeStateMachine(DescribeStateMachineRequest request) {
          request = beforeClientExecution(request);
          return executeDescribeStateMachine(request);
      }
docs: <p>
  Describes a state machine.
  </p>
  <note>
  <p>
  This operation is eventually consistent. The results are best effort and may not reflect very recent updates and
  changes.
  </p>
  </note>
  
  @param describeStateMachineRequest
  @return Result of the DescribeStateMachine operation returned by the service.
  @throws InvalidArnException
  The provided Amazon Resource Name (ARN) is invalid.
  @throws StateMachineDoesNotExistException
  The specified state machine does not exist.
  @sample AWSStepFunctions.DescribeStateMachine
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/states-2016-11-23/DescribeStateMachine" target="_top">AWS
  API Documentation</a>