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/*
* Copyright 2009 Phil Burk, Mobileer Inc
*
* 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.jsyn.engine;
/** Measure CPU load. */
public class LoadAnalyzer {
private long stopTime;
private long previousStopTime;
private long startTime;
private double averageTotalTime;
private double averageOnTime;
protected LoadAnalyzer() {
stopTime = System.nanoTime();
}
/**
* Call this when you stop doing something. Ideally all of the time since start() was spent on
* doing something without interruption.
*/
public void stop() {
previousStopTime = stopTime;
stopTime = System.nanoTime();
long onTime = stopTime - startTime;
long totalTime = stopTime - previousStopTime;
if (totalTime > 0) {
// Recursive averaging filter.
double rate = 0.01;
averageOnTime = (averageOnTime * (1.0 - rate)) + (onTime * rate);
averageTotalTime = (averageTotalTime * (1.0 - rate)) + (totalTime * rate);
}
}
/** Call this when you start doing something. */
public void start() {
startTime = System.nanoTime();
}
/** Calculate, on average, how much of the time was spent doing something. */
public double getAverageLoad() {
if (averageTotalTime > 0.0) {
return averageOnTime / averageTotalTime;
} else {
return 0.0;
}
}
}
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