code: @Override
      public DescribeAvailablePatchesResult describeAvailablePatches(DescribeAvailablePatchesRequest request) {
          request = beforeClientExecution(request);
          return executeDescribeAvailablePatches(request);
      }
docs: <p>
  Lists all patches that could possibly be included in a patch baseline.
  </p>
  
  @param describeAvailablePatchesRequest
  @return Result of the DescribeAvailablePatches operation returned by the service.
  @throws InternalServerErrorException
  An error occurred on the server side.
  @sample AWSSimpleSystemsManagement.DescribeAvailablePatches
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/ssm-2014-11-06/DescribeAvailablePatches" target="_top">AWS
  API Documentation</a>