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Apache Lucene (module: benchmark)
There is a newer version: 9.11.1
package org.apache.lucene.benchmark.byTask.tasks;

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;

import org.apache.lucene.benchmark.byTask.PerfRunData;
import org.apache.lucene.benchmark.byTask.stats.Report;
import org.apache.lucene.benchmark.byTask.stats.TaskStats;

/**
 * Report all statistics grouped/aggregated by name and round.
 * 
Other side effects: None.
 */
public class RepSumByNameRoundTask extends ReportTask {

  public RepSumByNameRoundTask(PerfRunData runData) {
    super(runData);
  }

  public int doLogic() throws Exception {
    Report rp = reportSumByNameRound(getRunData().getPoints().taskStats());

    System.out.println();
    System.out.println("------------> Report Sum By (any) Name and Round ("+
        rp.getSize()+" about "+rp.getReported()+" out of "+rp.getOutOf()+")");
    System.out.println(rp.getText());
    System.out.println();
    
    return 0;
  }

  /**
   * Report statistics as a string, aggregate for tasks named the same, and from the same round.
   * @return the report
   */
  protected Report reportSumByNameRound(List taskStats) {
    // aggregate by task name and round
    LinkedHashMap p2 = new LinkedHashMap();
    int reported = 0;
    for (Iterator it = taskStats.iterator(); it.hasNext();) {
      TaskStats stat1 = (TaskStats) it.next();
      if (stat1.getElapsed()>=0) { // consider only tasks that ended
        reported++;
        String name = stat1.getTask().getName();
        String rname = stat1.getRound()+"."+name; // group by round
        TaskStats stat2 = (TaskStats) p2.get(rname);
        if (stat2 == null) {
          try {
            stat2 = (TaskStats) stat1.clone();
          } catch (CloneNotSupportedException e) {
            throw new RuntimeException(e);
          }
          p2.put(rname,stat2);
        } else {
          stat2.add(stat1);
        }
      }
    }
    // now generate report from secondary list p2    
    return genPartialReport(reported, p2, taskStats.size());
  }

}