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 EDU.oswego.cs.dl.util.concurrent.SynchronizedLong;
21
22 import javax.management.j2ee.statistics.CountStatistic;
23
24 /***
25 * A count statistic implementation
26 *
27 * @version $Revision: 1.5 $
28 */
29 public class CountStatisticImpl extends StatisticImpl implements CountStatistic {
30
31 private final SynchronizedLong counter = new SynchronizedLong(0);
32 private CountStatisticImpl parent;
33
34 public CountStatisticImpl(CountStatisticImpl parent, String name, String description) {
35 this(name, description);
36 this.parent = parent;
37 }
38
39 public CountStatisticImpl(String name, String description) {
40 this(name, "count", description);
41 }
42
43 public CountStatisticImpl(String name, String unit, String description) {
44 super(name, unit, description);
45 }
46
47 public void reset() {
48 super.reset();
49 counter.set(0);
50 }
51
52 public long getCount() {
53 return counter.get();
54 }
55
56 public void setCount(long count) {
57 counter.set(count);
58 }
59
60 public void add(long amount) {
61 counter.add(amount);
62 updateSampleTime();
63 if (parent != null) {
64 parent.add(amount);
65 }
66 }
67
68 public void increment() {
69 counter.increment();
70 updateSampleTime();
71 if (parent != null) {
72 parent.increment();
73 }
74 }
75
76 public void subtract(long amount) {
77 counter.subtract(amount);
78 updateSampleTime();
79 if (parent != null) {
80 parent.subtract(amount);
81 }
82 }
83
84 public void decrement() {
85 counter.decrement();
86 updateSampleTime();
87 if (parent != null) {
88 parent.decrement();
89 }
90 }
91
92 public CountStatisticImpl getParent() {
93 return parent;
94 }
95
96 public void setParent(CountStatisticImpl parent) {
97 this.parent = parent;
98 }
99
100 protected void appendFieldDescription(StringBuffer buffer) {
101 buffer.append(" count: ");
102 buffer.append(Long.toString(counter.get()));
103 super.appendFieldDescription(buffer);
104 }
105 }