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
019import org.apache.camel.util.StopWatch;
020
021/**
022 * Holds the load throughput messages/second
023 */
024public final class LoadThroughput {
025
026    private final StopWatch watch = new StopWatch(false);
027    private long last;
028    private double thp;
029
030    /**
031     * Update the load statistics
032     *
033     * @param currentReading the current reading
034     */
035    public void update(long currentReading) {
036        if (!watch.isStarted()) {
037            watch.restart();
038            thp = 0;
039        } else {
040            long time = watch.takenAndRestart();
041            if (time > 0) {
042                long delta = currentReading - last;
043                if (delta > 0) {
044                    // need to calculate with fractions
045                    thp = (1000d / time) * delta;
046                } else {
047                    thp = 0;
048                }
049            } else {
050                thp = 0;
051            }
052        }
053        last = currentReading;
054    }
055
056    public double getThroughput() {
057        return thp;
058    }
059
060    public void reset() {
061        last = 0;
062        thp = 0;
063    }
064
065    @Override
066    public String toString() {
067        return "" + thp;
068    }
069
070}