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Lucene example source code file (Points.java)

This example Lucene source code file (Points.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Lucene tags/keywords

arraylist, arraylist, config, config, list, perftask, points, points, taskstats, taskstats, util

The Lucene Points.java source code

package org.apache.lucene.benchmark.byTask.stats;

/**
 * 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.ArrayList;
import java.util.List;

import org.apache.lucene.benchmark.byTask.tasks.PerfTask;
import org.apache.lucene.benchmark.byTask.utils.Config;


/**
 * Test run data points collected as the test proceeds.
 */
public class Points {

  // stat points ordered by their start time. 
  // for now we collect points as TaskStats objects.
  // later might optimize to collect only native data.
  private ArrayList<TaskStats> points = new ArrayList();

  private int nextTaskRunNum = 0;

  private TaskStats currentStats;

  /**
   * Create a Points statistics object. 
   */
  public Points (Config config) {
  }

  /**
   * Return the current task stats.
   * the actual task stats are returned, so caller should not modify this task stats. 
   * @return current {@link TaskStats}.
   */
  public List<TaskStats> taskStats () {
    return points;
  }

  /**
   * Mark that a task is starting. 
   * Create a task stats for it and store it as a point.
   * @param task the starting task.
   * @return the new task stats created for the starting task.
   */
  public synchronized TaskStats markTaskStart (PerfTask task, int round) {
    TaskStats stats = new TaskStats(task, nextTaskRunNum(), round);
    this.currentStats = stats;
    points.add(stats);
    return stats;
  }

  public TaskStats getCurrentStats() {
    return currentStats;
  }
  
  // return next task num
  private synchronized int nextTaskRunNum() {
    return nextTaskRunNum++;
  }
  
  /**
   * mark the end of a task
   */
  public synchronized void markTaskEnd (TaskStats stats, int count) {
    int numParallelTasks = nextTaskRunNum - 1 - stats.getTaskRunNum();
    // note: if the stats were cleared, might be that this stats object is 
    // no longer in points, but this is just ok.
    stats.markEnd(numParallelTasks, count);
  }

  /**
   * Clear all data, prepare for more tests.
   */
  public void clearData() {
    points.clear();
  }

}

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