code: @Override
      public DescribePipelinesResult describePipelines(DescribePipelinesRequest request) {
          request = beforeClientExecution(request);
          return executeDescribePipelines(request);
      }
docs: <p>
  Retrieves metadata about one or more pipelines. The information retrieved includes the name of the pipeline, the
  pipeline identifier, its current state, and the user account that owns the pipeline. Using account credentials,
  you can retrieve metadata about pipelines that you or your IAM users have created. If you are using an IAM user
  account, you can retrieve metadata about only those pipelines for which you have read permissions.
  </p>
  <p>
  To retrieve the full pipeline definition instead of metadata about the pipeline, call
  <a>GetPipelineDefinition</a>.
  </p>
  
  @param describePipelinesRequest
  Contains the parameters for DescribePipelines.
  @return Result of the DescribePipelines operation returned by the service.
  @throws PipelineNotFoundException
  The specified pipeline was not found. Verify that you used the correct user and account identifiers.
  @throws PipelineDeletedException
  The specified pipeline has been deleted.
  @throws InternalServiceErrorException
  An internal service error occurred.
  @throws InvalidRequestException
  The request was not valid. Verify that your request was properly formatted, that the signature was
  generated with the correct credentials, and that you haven't exceeded any of the service limits for your
  account.
  @sample DataPipeline.DescribePipelines
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/datapipeline-2012-10-29/DescribePipelines" target="_top">AWS
  API Documentation</a>