com.linkedin.helix.monitoring.StatCollector.java Source code

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Here is the source code for com.linkedin.helix.monitoring.StatCollector.java

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/**
 * Copyright (C) 2012 LinkedIn Inc <opensource@linkedin.com>
 *
 * 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 com.linkedin.helix.monitoring;

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);
    }
}