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 java.util.concurrent.atomic.AtomicLong;
020
021public class StatisticMaximum extends Statistic {
022
023    private final AtomicLong value = new AtomicLong(-1);
024
025    @Override
026    public void updateValue(long newValue) {
027        // its okay its not 100% thread safe (these jmx counters are not guaranteed to be accurate for min/max values)
028        // if we use the atomic operation updateAndGet then the JVM creates a new lambda per call which creates a new object
029        // in the JVM and causes higher memory footprint
030        long current = value.get();
031        if (current == -1 || current < newValue) {
032            value.set(newValue);
033        }
034    }
035
036    @Override
037    public long getValue() {
038        long num = value.get();
039        return num == -1 ? 0 : num;
040    }
041
042    @Override
043    public boolean isUpdated() {
044        return value.get() != -1;
045    }
046
047    @Override
048    public String toString() {
049        return "" + value.get();
050    }
051
052    @Override
053    public void reset() {
054        value.set(-1);
055    }
056
057}