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 }