content: /*
   * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
   * (the "License"). You may not use this work except in compliance with the License, which is
   * available at www.apache.org/licenses/LICENSE-2.0
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied, as more fully set forth in the License.
   *
   * See the NOTICE file distributed with this work for information regarding copyright ownership.
   */
  
  package alluxio.stress;
  
  import alluxio.util.JsonSerializable;
  
  import java.util.List;
  
  /**
   * This represents the result of a single stress task. A {@link TaskResult} is meant to be
   * aggregated into a {@link Summary}.
   */
  public interface TaskResult extends JsonSerializable {
  
    /**
     * @return the aggregator that can produce a summary
     */
    Aggregator aggregator();
  
    /**
     * The interface that aggregates multiple task results into a summary.
     *
     * @param <T> a {@link TaskResult} type
     */
    interface Aggregator<T extends TaskResult> {
      /**
       * Aggregates multiple instances of a {@link TaskResult} to a summary.
       *
       * @param results list of {@link TaskResult}
       * @return the aggregated summary
       */
      Summary aggregate(Iterable<T> results) throws Exception;
    }
  
    /**
     * @return the list of errors in the result
     */
    List<String> getErrors();
  
    /**
     * @return the base parameters of the result
     */
    BaseParameters getBaseParameters();
  }
  