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.activeio.stats;
19
20 import javax.management.j2ee.statistics.Statistic;
21
22 /***
23 * Shamelessly taken from the ActiveMQ project ( http://activemq.com )
24 *
25 * Base class for a Statistic implementation
26 * @version $Revision: 1.1 $
27 */
28 public class StatisticImpl implements Statistic {
29 private String name;
30 private String unit;
31 private String description;
32 private long startTime;
33 private long lastSampleTime;
34
35 public StatisticImpl(String name, String unit, String description) {
36 this.name = name;
37 this.unit = unit;
38 this.description = description;
39 startTime = System.currentTimeMillis();
40 lastSampleTime = startTime;
41 }
42
43 public synchronized void reset() {
44 startTime = System.currentTimeMillis();
45 lastSampleTime = startTime;
46 }
47
48 protected synchronized void updateSampleTime() {
49 lastSampleTime = System.currentTimeMillis();
50 }
51
52 public synchronized String toString() {
53 StringBuffer buffer = new StringBuffer();
54 buffer.append(name);
55 buffer.append("{");
56 appendFieldDescription(buffer);
57 buffer.append(" }");
58 return buffer.toString();
59 }
60
61 public String getName() {
62 return name;
63 }
64
65 public String getUnit() {
66 return unit;
67 }
68
69 public String getDescription() {
70 return description;
71 }
72
73 public synchronized long getStartTime() {
74 return startTime;
75 }
76
77 public synchronized long getLastSampleTime() {
78 return lastSampleTime;
79 }
80
81 protected synchronized void appendFieldDescription(StringBuffer buffer) {
82 buffer.append(" unit: ");
83 buffer.append(unit);
84 buffer.append(" startTime: ");
85
86 buffer.append(startTime);
87 buffer.append(" lastSampleTime: ");
88
89 buffer.append(lastSampleTime);
90 buffer.append(" description: ");
91 buffer.append(description);
92 }
93 }