001/** 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.camel.management.mbean; 018 019/** 020 * Holds the loads averaged over 1min, 5min, and 15min. 021 */ 022public final class LoadTriplet { 023 024 // Exponents for EWMA: exp(-INTERVAL / WINDOW) (in seconds) 025 private static final double EXP_1 = Math.exp(-1 / (60.0 * 1.0)); 026 private static final double EXP_5 = Math.exp(-1 / (60.0 * 5.0)); 027 private static final double EXP_15 = Math.exp(-1 / (60.0 * 15.0)); 028 029 private double load01 = Double.NaN; 030 private double load05 = Double.NaN; 031 private double load15 = Double.NaN; 032 033 /** 034 * Update the load statistics 035 * 036 * @param currentReading the current reading 037 */ 038 public void update(int currentReading) { 039 load01 = updateLoad(currentReading, EXP_1, load01); 040 load05 = updateLoad(currentReading, EXP_5, load05); 041 load15 = updateLoad(currentReading, EXP_15, load15); 042 } 043 044 private double updateLoad(int reading, double exp, double recentLoad) { 045 return Double.isNaN(recentLoad) ? reading : reading + exp * (recentLoad - reading); 046 } 047 048 public double getLoad1() { 049 return load01; 050 } 051 052 public double getLoad5() { 053 return load05; 054 } 055 056 public double getLoad15() { 057 return load15; 058 } 059 060 @Override 061 public String toString() { 062 return String.format("%.2f, %.2f, %.2f", getLoad1(), getLoad5(), getLoad15()); 063 } 064 065}