timeaverage.java

提供ESB 应用mule源代码 提供ESB 应用mule源代码

/*
 * $Id: TimeAverage.java 8077 2007-08-27 20:15:25Z aperepel $
 * --------------------------------------------------------------------------------------
 * Copyright (c) MuleSource, Inc.  All rights reserved.  http://www.mulesource.com
 *
 * The software in this package is published under the terms of the CPAL v1.0
 * license, a copy of which has been included with this distribution in the
 * LICENSE.txt file.
 */

package org.mule.util.counters.impl;

import org.mule.util.counters.CounterFactory.Type;

public class TimeAverage extends AggregateCounter
{

    private double sum = 0.0;
    private double lastValue = 0.0;
    private final long firstTime = System.currentTimeMillis();
    private long lastTime = firstTime;

    public TimeAverage(String name, AbstractCounter base)
    {
        super(name, Type.AVERAGE, base);
    }

    public double nextValue()
    {
        long current = System.currentTimeMillis();
        return (sum + lastValue * (current - this.lastTime)) / (current - firstTime);
    }

    public void doCompute()
    {
        long current = System.currentTimeMillis();
        this.sum += this.lastValue * (current - this.lastTime);
        this.lastValue = getBase().nextValue();
        this.lastTime = current;
    }

}