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.activemq.management;
018
019
020/**
021 * A range statistic implementation
022 *
023 * 
024 */
025public class RangeStatisticImpl extends StatisticImpl {
026    private long highWaterMark;
027    private long lowWaterMark;
028    private long current;
029
030    public RangeStatisticImpl(String name, String unit, String description) {
031        super(name, unit, description);
032    }
033
034    public void reset() {
035        if (isDoReset()) {
036            super.reset();
037            current = 0;
038            lowWaterMark = 0;
039            highWaterMark = 0;
040        }
041    }
042
043    public long getHighWaterMark() {
044        return highWaterMark;
045    }
046
047    public long getLowWaterMark() {
048        return lowWaterMark;
049    }
050
051    public long getCurrent() {
052        return current;
053    }
054
055    public void setCurrent(long current) {
056        this.current = current;
057        if (current > highWaterMark) {
058            highWaterMark = current;
059        }
060        if (current < lowWaterMark || lowWaterMark == 0) {
061            lowWaterMark = current;
062        }
063        updateSampleTime();
064    }
065
066    protected void appendFieldDescription(StringBuffer buffer) {
067        buffer.append(" current: ");
068        buffer.append(Long.toString(current));
069        buffer.append(" lowWaterMark: ");
070        buffer.append(Long.toString(lowWaterMark));
071        buffer.append(" highWaterMark: ");
072        buffer.append(Long.toString(highWaterMark));
073        super.appendFieldDescription(buffer);
074    }
075}