/*
* 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.
*
*/
package org.apache.jmeter.report.processor;
import org.apache.commons.math3.stat.descriptive.DescriptiveStatistics;
import org.apache.jmeter.report.config.ReportGeneratorConfiguration;
import org.apache.jmeter.util.JMeterUtils;
/**
* The class PercentileAggregator is used to get percentile from samples.
*
* @since 3.0
*/
public class PercentileAggregator implements Aggregator {
private static final int SLIDING_WINDOW_SIZE = JMeterUtils.getPropDefault(
ReportGeneratorConfiguration.REPORT_GENERATOR_KEY_PREFIX
+ ReportGeneratorConfiguration.KEY_DELIMITER
+ "statistic_window", 20000);
private final DescriptiveStatistics statistics;
private final double percentileIndex;
/**
* Instantiates a new percentile aggregator.
*
* @param index
* the index of the percentile
*/
public PercentileAggregator(double index) {
statistics = new DescriptiveStatistics(SLIDING_WINDOW_SIZE);
percentileIndex = index;
}
/**
* @param lastAggregator {@link PercentileAggregator}
*/
public PercentileAggregator(PercentileAggregator lastAggregator) {
this.statistics = new DescriptiveStatistics(lastAggregator.statistics);
this.percentileIndex = lastAggregator.percentileIndex;
}
/*
* (non-Javadoc)
*
* @see org.apache.jmeter.report.core.GraphAggregator#getCount()
*/
@Override
public long getCount() {
return statistics.getN();
}
/*
* (non-Javadoc)
*
* @see org.apache.jmeter.report.core.GraphAggregator#getResult()
*/
@Override
public double getResult() {
return statistics.getPercentile(percentileIndex);
}
/*
* (non-Javadoc)
*
* @see org.apache.jmeter.report.core.GraphAggregator#addValue(double)
*/
@Override
public void addValue(double value) {
statistics.addValue(value);
}
/*
* (non-Javadoc)
*
* @see org.apache.jmeter.report.core.GraphAggregator#reset()
*/
@Override
public void reset() {
statistics.clear();
}
}