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1   /***
2    * 
3    * Copyright 2004 Protique Ltd
4    * 
5    * Licensed under the Apache License, Version 2.0 (the "License"); 
6    * you may not use this file except in compliance with the License. 
7    * You may obtain a copy of the License at 
8    * 
9    * http://www.apache.org/licenses/LICENSE-2.0
10   * 
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS, 
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
14   * See the License for the specific language governing permissions and 
15   * limitations under the License. 
16   * 
17   **/
18  package org.codehaus.activemq.management;
19  
20  import javax.management.j2ee.statistics.RangeStatistic;
21  
22  /***
23   * A range statistic implementation
24   *
25   * @version $Revision: 1.1 $
26   */
27  public class RangeStatisticImpl extends StatisticImpl implements RangeStatistic {
28      private long highWaterMark;
29      private long lowWaterMark;
30      private long current;
31  
32      public RangeStatisticImpl(String name, String unit, String description) {
33          super(name, unit, description);
34      }
35  
36      public void reset() {
37          super.reset();
38          current = 0;
39          lowWaterMark = 0;
40          highWaterMark = 0;
41      }
42  
43      public long getHighWaterMark() {
44          return highWaterMark;
45      }
46  
47      public long getLowWaterMark() {
48          return lowWaterMark;
49      }
50  
51      public long getCurrent() {
52          return current;
53      }
54  
55      public void setCurrent(long current) {
56          this.current = current;
57          if (current > highWaterMark) {
58              highWaterMark = current;
59          }
60          if (current < lowWaterMark || lowWaterMark == 0) {
61              lowWaterMark = current;
62          }
63          updateSampleTime();
64      }
65  
66      protected void appendFieldDescription(StringBuffer buffer) {
67          buffer.append(" current: ");
68          buffer.append(Long.toString(current));
69          buffer.append(" lowWaterMark: ");
70          buffer.append(Long.toString(lowWaterMark));
71          buffer.append(" highWaterMark: ");
72          buffer.append(Long.toString(highWaterMark));
73          super.appendFieldDescription(buffer);
74      }
75  }