code: @Override
      public UpdateFunctionCodeResult updateFunctionCode(UpdateFunctionCodeRequest request) {
          request = beforeClientExecution(request);
          return executeUpdateFunctionCode(request);
      }
docs: <p>
  Updates a Lambda function's code.
  </p>
  <p>
  The function's code is locked when you publish a version. You can't modify the code of a published version, only
  the unpublished version.
  </p>
  
  @param updateFunctionCodeRequest
  @return Result of the UpdateFunctionCode operation returned by the service.
  @throws ServiceException
  The AWS Lambda service encountered an internal error.
  @throws ResourceNotFoundException
  The resource (for example, a Lambda function or access policy statement) specified in the request does
  not exist.
  @throws InvalidParameterValueException
  One of the parameters in the request is invalid. For example, if you provided an IAM role for AWS Lambda
  to assume in the <code>CreateFunction</code> or the <code>UpdateFunctionConfiguration</code> API, that
  AWS Lambda is unable to assume you will get this exception.
  @throws TooManyRequestsException
  Request throughput limit exceeded.
  @throws CodeStorageExceededException
  You have exceeded your maximum total code size per account. <a
  href="https://docs.aws.amazon.com/lambda/latest/dg/limits.html">Learn more</a>
  @throws PreconditionFailedException
  The RevisionId provided does not match the latest RevisionId for the Lambda function or alias. Call the
  <code>GetFunction</code> or the <code>GetAlias</code> API to retrieve the latest RevisionId for your
  resource.
  @sample AWSLambda.UpdateFunctionCode
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/lambda-2015-03-31/UpdateFunctionCode" target="_top">AWS API
  Documentation</a>