package org.apache.helix.monitoring;
/*
* 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 org.apache.commons.math.stat.descriptive.DescriptiveStatistics;
import org.apache.commons.math.stat.descriptive.SynchronizedDescriptiveStatistics;
public class StatCollector
{
private static final int DEFAULT_WINDOW_SIZE = 100;
private final DescriptiveStatistics _stats;
private long _numDataPoints;
private long _totalSum;
public StatCollector()
{
_stats = new SynchronizedDescriptiveStatistics();
_stats.setWindowSize(DEFAULT_WINDOW_SIZE);
}
public void addData(double data)
{
_numDataPoints++;
_totalSum += data;
_stats.addValue(data);
}
public long getTotalSum()
{
return _totalSum;
}
public DescriptiveStatistics getStatistics()
{
return _stats;
}
public long getNumDataPoints()
{
return _numDataPoints;
}
public void reset()
{
_numDataPoints = 0;
_totalSum = 0;
_stats.clear();
}
public double getMean()
{
if(_stats.getN() == 0)
{
return 0;
}
return _stats.getMean();
}
public double getMax()
{
return _stats.getMax();
}
public double getMin()
{
return _stats.getMin();
}
public double getPercentile(int percentage)
{
if(_stats.getN() == 0)
{
return 0;
}
return _stats.getPercentile(percentage*1.0);
}
}