code: @Override
      public ListLayersResult listLayers(ListLayersRequest request) {
          request = beforeClientExecution(request);
          return executeListLayers(request);
      }
docs: <p>
  Lists <a href="https://docs.aws.amazon.com/lambda/latest/dg/configuration-layers.html">AWS Lambda layers</a> and
  shows information about the latest version of each. Specify a <a
  href="https://docs.aws.amazon.com/lambda/latest/dg/lambda-runtimes.html">runtime identifier</a> to list only
  layers that indicate that they're compatible with that runtime.
  </p>
  
  @param listLayersRequest
  @return Result of the ListLayers operation returned by the service.
  @throws ServiceException
  The AWS Lambda service encountered an internal error.
  @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.
  @sample AWSLambda.ListLayers
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/lambda-2015-03-31/ListLayers" target="_top">AWS API
  Documentation</a>