001    /**
002     * 
003     * Copyright 2004 Protique Ltd
004     * 
005     * Licensed under the Apache License, Version 2.0 (the "License"); 
006     * you may not use this file except in compliance with the License. 
007     * 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     * 
017     **/
018    package org.activemq.management;
019    
020    
021    /**
022     * A range statistic implementation
023     *
024     * @version $Revision: 1.1.1.1 $
025     */
026    public class RangeStatisticImpl extends StatisticImpl {
027        private long highWaterMark;
028        private long lowWaterMark;
029        private long current;
030    
031        public RangeStatisticImpl(String name, String unit, String description) {
032            super(name, unit, description);
033        }
034    
035        public void reset() {
036            super.reset();
037            current = 0;
038            lowWaterMark = 0;
039            highWaterMark = 0;
040        }
041    
042        public long getHighWaterMark() {
043            return highWaterMark;
044        }
045    
046        public long getLowWaterMark() {
047            return lowWaterMark;
048        }
049    
050        public long getCurrent() {
051            return current;
052        }
053    
054        public void setCurrent(long current) {
055            this.current = current;
056            if (current > highWaterMark) {
057                highWaterMark = current;
058            }
059            if (current < lowWaterMark || lowWaterMark == 0) {
060                lowWaterMark = current;
061            }
062            updateSampleTime();
063        }
064    
065        protected void appendFieldDescription(StringBuffer buffer) {
066            buffer.append(" current: ");
067            buffer.append(Long.toString(current));
068            buffer.append(" lowWaterMark: ");
069            buffer.append(Long.toString(lowWaterMark));
070            buffer.append(" highWaterMark: ");
071            buffer.append(Long.toString(highWaterMark));
072            super.appendFieldDescription(buffer);
073        }
074    }