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The Core Camel Java DSL based router
/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.camel.management.mbean;
/**
* Holds the loads averaged over 1min, 5min, and 15min.
*/
public final class LoadTriplet {
// Exponents for EWMA: exp(-INTERVAL / WINDOW) (in seconds)
private static final double EXP_1 = Math.exp(-1 / (60.0 * 1.0));
private static final double EXP_5 = Math.exp(-1 / (60.0 * 5.0));
private static final double EXP_15 = Math.exp(-1 / (60.0 * 15.0));
private double load01 = Double.NaN;
private double load05 = Double.NaN;
private double load15 = Double.NaN;
/**
* Update the load statistics
*
* @param currentReading the current reading
*/
public void update(int currentReading) {
load01 = updateLoad(currentReading, EXP_1, load01);
load05 = updateLoad(currentReading, EXP_5, load05);
load15 = updateLoad(currentReading, EXP_15, load15);
}
private double updateLoad(int reading, double exp, double recentLoad) {
return Double.isNaN(recentLoad) ? reading : reading + exp * (recentLoad - reading);
}
public double getLoad1() {
return load01;
}
public double getLoad5() {
return load05;
}
public double getLoad15() {
return load15;
}
@Override
public String toString() {
return String.format("%.2f, %.2f, %.2f", getLoad1(), getLoad5(), getLoad15());
}
}