Subversion Repositories SmartDukaan

/*

 *	Copyright 2005 stat4j.org

 *

 *   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 net.sourceforge.stat4j.calculators;

import java.util.Properties;

import net.sourceforge.stat4j.Metric;

/**

 * Name:		Rate.java

 * Date:		Aug 29, 2004

 * Description:

 * 

 * 

 * @author Lara D'Abreo

 */

public class Rate extends CalculatorAdapter {

	protected long starttimestamp;

	protected double	rate;

	protected long 		period;

	protected long		occurances;

	public Rate() {

		reset();

	}

	public void applyMetric(Metric metric) {

		occurances = occurances + 1;

		if (metric.isSingle()) {

			double elapsedTime = metric.getTimestamp() - starttimestamp;

			if (elapsedTime == 0.0) return;

			double divisor = elapsedTime / period;

			rate = occurances / divisor;		

			//System.out.println("e:" + elapsedTime + " d:" + divisor + " rate:" + rate);

			setTimestamp(metric.getTimestamp());

		}

	}

	public double getResult() {

		return rate;

	}

	public void reset() {

		occurances = 0;

		this.rate = 0.0;

		starttimestamp = System.currentTimeMillis();

	}

	public void init(String name,Properties properties) {

		// read per

		String periodStr = properties.getProperty("period","1000");

		this.period = Long.parseLong(periodStr);

		super.init(name);

	}

}