code: @Override
      public GetGroupsResult getGroups(GetGroupsRequest request) {
          request = beforeClientExecution(request);
          return executeGetGroups(request);
      }
docs: <p>
  Retrieves all active group details.
  </p>
  
  @param getGroupsRequest
  @return Result of the GetGroups operation returned by the service.
  @throws InvalidRequestException
  The request is missing required parameters or has invalid parameters.
  @throws ThrottledException
  The request exceeds the maximum number of requests per second.
  @sample AWSXRay.GetGroups
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/xray-2016-04-12/GetGroups" target="_top">AWS API
  Documentation</a>