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     */
017    package org.apache.activemq.management;
018    
019    
020    /**
021     * A range statistic implementation
022     *
023     * 
024     */
025    public 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    }