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/*
 *      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);
        }
}