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.Statistic;
21
22 /***
23 * Base class for a Statistic implementation
24 *
25 * @version $Revision: 1.2 $
26 */
27 public class StatisticImpl implements Statistic, Resettable {
28 private String name;
29 private String unit;
30 private String description;
31 private long startTime;
32 private long lastSampleTime;
33
34 public StatisticImpl(String name, String unit, String description) {
35 this.name = name;
36 this.unit = unit;
37 this.description = description;
38 startTime = System.currentTimeMillis();
39 lastSampleTime = startTime;
40 }
41
42 public synchronized void reset() {
43 startTime = System.currentTimeMillis();
44 lastSampleTime = startTime;
45 }
46
47 protected synchronized void updateSampleTime() {
48 lastSampleTime = System.currentTimeMillis();
49 }
50
51 public synchronized String toString() {
52 StringBuffer buffer = new StringBuffer();
53 buffer.append(name);
54 buffer.append("{");
55 appendFieldDescription(buffer);
56 buffer.append(" }");
57 return buffer.toString();
58 }
59
60 public String getName() {
61 return name;
62 }
63
64 public String getUnit() {
65 return unit;
66 }
67
68 public String getDescription() {
69 return description;
70 }
71
72 public synchronized long getStartTime() {
73 return startTime;
74 }
75
76 public synchronized long getLastSampleTime() {
77 return lastSampleTime;
78 }
79
80 protected synchronized void appendFieldDescription(StringBuffer buffer) {
81 buffer.append(" unit: ");
82 buffer.append(unit);
83 buffer.append(" startTime: ");
84
85 buffer.append(startTime);
86 buffer.append(" lastSampleTime: ");
87
88 buffer.append(lastSampleTime);
89 buffer.append(" description: ");
90 buffer.append(description);
91 }
92 }