Statistics.java

/**
 * Copyright 2013, Landz and its contributors. All rights reserved.
 *
 *    Licensed 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.
 */

package z.testware.benchmark;

import java.util.List;

/**
 * Calculate simple statistics from multiple {@link SingleResult}s.
 */
final class Statistics
{
    public Average gc;
    public Average evaluation;
    public Average blocked;

    public static Statistics from(List<SingleResult> results)
    {
        final Statistics stats = new Statistics();
        long [] times = new long [results.size()];

        // GC-times.
        for (int i = 0; i < times.length; i++)
            times[i] = results.get(i).gcTime();
        stats.gc = Average.from(times);

        // Evaluation-only times.
        for (int i = 0; i < times.length; i++)
            times[i] = results.get(i).evaluationTime();
        stats.evaluation = Average.from(times);

        // Thread blocked times.
        for (int i = 0; i < times.length; i++)
            times[i] = results.get(i).blockTime;
        stats.blocked = Average.from(times);


        return stats;
    }
}